Dual Measurement Multimeter

Transcription

1 Dual Measureent Multieter GDM-8351 USER MANUAL GW INSTEK PART NO. 82DM-83510E01 ISO-9001 CERTIFIED MANUFACTURER

2 This anual contains proprietary inforation, which is protected by copyright. All rights are reserved. No part of this anual ay be photocopied, reproduced or translated to another language without prior written consent of Good Will copany. The inforation in this anual was correct at the tie of printing. However, Good Will continues to iprove products and reserves the rights to change specification, equipent, and aintenance procedures at any tie without notice. Good Will Instruent Co., Ltd. No. 7-1, Jhongsing Rd., Tucheng Dist., New Taipei City 236, Taiwan.

3 Table of Contents Table of Contents SAFETY INSTRUCTIONS... 5 GETTING STARTED Characteristics Appearance Set Up OPERATION Basic Measureent Overview AC/DC Voltage Measureent AC/DC Current Measureent Resistance Measureent Diode Test Capacitance Measureent Continuity Test Frequency/Period Measureent Teperature Measureent Dual Measureent Overview Advanced Measureent Overview db/db/w Measureent Max/Min Measureent Relative Measureent Hold Measureent Copare Measureent Math Measureent SYSTEM/DISPLAY CONFIGURATION View Serial Nuber View Version Nuber Brightness Settings Input Resistance Settings

4 GDM-8351 User Manual Frequency/Period Input Jack Settings Digital Filter Restore Factory Default Settings Trigger DIGITAL I/O Digital I/O Overview REMOTE CONTROL Configure Reote Control Interface Return to Local Control COMMAND OVERVIEW Coand Syntax Coand List FAQ APPENDIX Syste Menu Tree Factory Default Settings Replacing the AC Source Fuse Replacing the Input Fuse Status syste Specifications Additional Specifications Diensions Declaration of Confority INDEX

5 SAFETY INSTRUCTIONS SAFETY INSTRUCTIONS This chapter contains iportant safety instructions that you ust follow during operation and storage. Read the following before any operation to ensure your safety and to keep the instruent in the best possible condition. Safety Sybols These safety sybols ay appear in this anual or on the instruent. WARNING CAUTION Warning: Identifies conditions or practices that could result in injury or loss of life. Caution: Identifies conditions or practices that could result in daage to the DMM or to other properties. DANGER High Voltage Attention Refer to the Manual Protective Conductor Terinal Earth (ground) Terinal Do not dispose electronic equipent as unsorted unicipal waste. Please use a separate collection facility or contact the supplier fro which this instruent was purchased. 5

6 GDM-8351 User Manual Safety Guidelines General Guideline CAUTION Make sure that the voltage input level does not exceed DC1000V/AC750V. Make sure the current input level does not exceed 12A. Do not place any heavy object on the instruent. Avoid severe ipact or rough handling that can lead to daaging the instruent. Do not discharge static electricity to the instruent. Use only ating connectors, not bare wires, for the terinals. Do not block or obstruct the cooling fan vent opening. Do not perfor easureent at the source of a low-voltage installation or at building installations (Note below). Do not disasseble the instruent unless you are qualified as service personnel. Make sure that the COM terinal to earth is liited to 500Vpk. Reove all test leads before disconnecting the ains power cord fro the socket. (Note) EN :2010 specifies the easureent categories and their requireents as follows. The GDM-8351 falls under category II 600V. Measureent category IV is for easureent perfored at the source of low-voltage installation. Measureent category III is for easureent perfored in the building installation. Measureent category II is for easureent perfored on the circuits directly connected to the low voltage installation. 6

7 SAFETY INSTRUCTIONS Power Supply Fuse WARNING WARNING Cleaning the Instruent Operation Environent AC Input voltage: 100/120/220/240 V AC 50/60Hz The power supply voltage should not fluctuate ore than 10%. Connect the protective grounding conductor of the AC power cord to an earth ground, to avoid electrical shock. Fuse type: 0.125AT 100/120VAC 0.063AT 220/240 VAC Make sure the correct type of fuse is installed before power up. To avoid risk of fire, replace the fuse only with the specified type and rating. Disconnect the power cord before fuse replaceent. Make sure the cause of a fuse blowout is fixed before fuse replaceent. Disconnect the power cord before cleaning. Use a soft cloth dapened in a solution of ild detergent and water. Do not spray any liquid. Do not use cheicals containing harsh aterial such as benzene, toluene, xylene, and acetone. Location: Indoor, no direct sunlight, dust free, alost non-conductive pollution (Note below) Teperature: 0 C to 50 C Huidity: 0~35 C: < 90%RH >35 C: <80%RH Altitude: <2000 7

8 GDM-8351 User Manual Storage environent Disposal (Note) EN :2010 specifies the pollution degrees and their requireents as follows. The GDM-8351 falls under degree 2. Pollution refers to addition of foreign atter, solid, liquid, or gaseous (ionized gases), that ay produce a reduction of dielectric strength or surface resistivity. Pollution degree 1: No pollution or only dry, non-conductive pollution occurs. The pollution has no influence. Pollution degree 2: Norally only non-conductive pollution occurs. Occasionally, however, a teporary conductivity caused by condensation ust be expected. Pollution degree 3: Conductive pollution occurs, or dry, nonconductive pollution occurs which becoes conductive due to condensation which is expected. In such conditions, equipent is norally protected against exposure to direct sunlight, precipitation, and full wind pressure, but neither teperature nor huidity is controlled. Location: Indoor Teperature: -40 C to 70 C Huidity: 0~35 C: <90%RH >35 C: <80%RH Do not dispose this instruent as unsorted unicipal waste. Please use a separate collection facility or contact the supplier fro which this instruent was purchased. Please ake sure discarded electrical waste is properly recycled to reduce environental ipact. 8

9 Power cord for the United Kingdo SAFETY INSTRUCTIONS When using the unit in the United Kingdo, ake sure the power cord eets the following safety instructions. NOTE: This lead/appliance ust only be wired by copetent persons WARNING: THIS APPLIANCE MUST BE EARTHED IMPORTANT: The wires in this lead are coloured in accordance with the following code: Green/ Yellow: Earth Blue: Neutral Brown: Live (Phase) As the colours of the wires in ain leads ay not correspond with the coloured arking identified in your plug/appliance, proceed as follows: The wire which is coloured Green & Yellow ust be connected to the Earth terinal arked with either the letter E, the earth sybol or coloured Green/Green & Yellow. The wire which is coloured Blue ust be connected to the terinal which is arked with the letter N or coloured Blue or Black. The wire which is coloured Brown ust be connected to the terinal arked with the letter L or P or coloured Brown or Red. If in doubt, consult the instructions provided with the equipent or contact the supplier. This cable/appliance should be protected by a suitably rated and approved HBC ains fuse: refer to the rating inforation on the equipent and/or user instructions for details. As a guide, a cable of should be protected by a 3A or 5A fuse. Larger conductors would norally require 13A types, depending on the connection ethod used. Any exposed wiring fro a cable, plug or connection that is engaged in a live socket is extreely hazardous. If a cable or plug is deeed hazardous, turn off the ains power and reove the cable, any fuses and fuse asseblies. All hazardous wiring ust be iediately destroyed and replaced in accordance to the above standard. 9

10 GDM-8351 User Manual GETTING STARTED This chapter describes the GDM-8351 ultieter in a nutshell, including accessories, package contents, its ain features and front / rear panel introduction. Characteristics Accessories Appearance GDM-8351 Front Panel Display Overview Rear Panel Set Up Tilting the Stand Power Up How to Use the Instruent

11 GETTING STARTED Characteristics The GDM-8351 is a portable, dual-display digital ultieter suitable for a wide range of applications, such as production testing, research, and field verification. Perforance DCV accuracy: 0.012% High current range: 10A High Voltage range: 1000V High ACV frequency response: 100kHz Features Interface Software The fastest sapling rate is (320 Readings / sec) for ADC and PC transission. The diode test open-circuit voltage is 6V/1A count display Multiple functions: ACV, DCV, ACI, DCI, 2WR, 4WR, Cap, Freq, Period,Tep, Continuity, Diode test, MAX/MIN, Avg, REL, db, db, Hold, MX+B, 1/X, REF, %, Copare. Manual or Auto ranging AC true RMS Data logging to PC using an Excel Add-In. USB device port supports USBCDC and USBTMC. RS232 Digital I/O port can used in either pass/fail testing (Copare function) or have the output state reotely controlled. Only one function at a tie can be used. Excel Addins LABVIEW driver 11

12 GDM-8351 User Manual Accessories Standard Accessories Optional Accessories Part nuber 82DM-83510E x1 82DM-83511M x1 GTL-207 Part nuber GTL-246 GTL-205 Description CD-ROM (User Manual, Software, Driver) Safety Instruction Sheet Test leads Description USB Cable, USB 2.0, A-B type, 1200 Teperature Probe Adapter with Theral Coupling (K-type) 12

13 GETTING STARTED Appearance GDM-8351 Front Panel Power Switch Sense LO Terinal Sense HI Terinal POWER GDM-8351 DC + AC DCI ACI TEMP db LOCAL DCV ACV / 2W/4W Hz/P 2ND REL# MATH COMP TYPE REL MX/MN HOLD FILTER MENU Function keys Main Display Counts Dual Measureent Multieter db SHIFT EXIT RANGE Auto Enter RANGE H I LO 10A Arrow keys SENSE W 4W CAT II 600V 200Vpk INPUT V W 1000V 750V FUSE 1.25A/1000V COM 500Vpk 1A DC/AC 10A Terinal V W Terinal COM Terinal DC/AC 1A Terinal, 1.25A/1000V Fuse Holder Power Switch POWER Turns On or Off the ain power. For the power up sequence, see page 24. Main Display Shows easureent results and paraeters. For display configuration details, see page 78 (brightness setting). For an overview of the ain display, see page 19. V W SENSE Input Terinal W 4W H I INPUT V W This terinal is used for all easureents except for DC/AC current easureents. 200Vpk 1000V 750V LO COM 500Vpk 13

14 GDM-8351 User Manual COM Terinal 0Vpk 1000V 750V Accepts ground (COM) line in all easureents. COM 500Vpk The axiu withstand voltage between this terinal and earth is 500Vpk. DC/AC 1A Terinal AMPS Fuse Holder FUSE 1.25A/1000V 500Vpk 1A COM Low current easureent terinal. Accepts DC/AC Current input. For details see page 37. DC: 10A~1A AC: 10A~1A As a fuse, protects the instruent fro over-current. Rating: F1.25A, 1000V.(This terinal accepts DC/AC current input) DC/AC 10A Terinal LO For the fuse replaceent procedure, see page 142. High range current easureent terinal. Accepts DC/AC Current input. For DCI or ACI details, see page A CAT II 600V 1. 14

15 GETTING STARTED Sense HI Terinal SENSE W 4W Accepts HI sense line in 4W Vresistance easureent. Sense LO Terinal H I 200Vpk Accepts LO sense line in 4W resistance easureent. LO Measureent Keys The top row of easureent keys are used for basic DMM easureents such as voltage, current, resistance, capacitance and frequency. The botto row of easureent functions are used for ore advanced functions. Upper Measureent keys Each key has a priary and secondary function. The secondary function is accessed in conjunction with the SHIFT key. DCV DCI Measures DC Voltage (page 32). DCV DCI (SHIFT DCV) SHIFT DCI EXIT DCV Measures DC Current (page 37). ACV ACI Measures AC Voltage (page 32). ACV ACI (SHIFT ACV) SHIFT ACI EXIT ACV Measures AC Current (page 37). 15

16 GDM-8351 User Manual DCV + ACV DCI DCV ACI + ACV Measures DC + AC voltage (page 32). DCI+ACI SHIFT DCI EXIT DCV + ACV ACI Measures DC + AC current (page 37). 2W/4W TEMP Measures resistance (2W or 4W) See page 42. 2W/4W TEMP (SHIFT 2W/4W) SHIFT TEMP EXIT 2W/4W Measures teperature. See page 53. / / Measures diodes or continuity, depending on the selected ode. See page 45 and 48, respectively. Measures capacitance. See (SHIFT / ) SHIFT page 46. EXIT / Hz/P db Hz/P Measures the frequency or period of a signal, depending on the selected ode. See page 51. db (SHIFT Hz/P) SHIFT EXIT Hz/P db Measures db. See page

17 GETTING STARTED 2ND LOCAL 2ND As the 2ND key, selects the easureent ite on the 2 nd display (page 57). Pressing and holding for ore than 1 second turns off the 2 nd display. As the Local key, releases the unit fro reote control and returns the instruent to local panel operation (page 97). Lower Measureent keys REL REL# REL Measures the Relative value (page 67). REL# (SHIFT REL) SHIFT REL# EXIT REL Manually sets the reference value for the Relative value easureent. MX/MN MATH MX/MN Measures the Maxiu or the Miniu value (page 66). MATH (SHIFT MX/MN) SHIFT MATH EXIT MX/MN Enters the Math easureent ode. The supported ath functions include MX+B, REF% and 1/X. See page 72 for details. HOLD COMP HOLD Activates the Hold function (page 69). 17

18 GDM-8351 User Manual COMP (SHIFT HOLD) SHIFT COMP EXIT HOLD Activates the copare easureent function. See page 70. FILTER TYPE FILTER Turns the digital filter on or off. See page 81. TYPE (SHIFT FILTER) SHIFT TYPE EXIT FILTER Sets the type of filter and the size of the rolling window. See page 82. MENU db MENU Enters the configuration enu for Syste Settings, Measureent Settings, Teperature easureent settings, I/O settings, Terinal character settings and Firware installation. See page 76 for the syste enu. db (SHIFT MENU) SHIFT db EXIT MENU Measures db/w, see page 63. SHIFT/EXIT SHIFT EXIT When used as a SHIFT key, it is used to access the secondary functions associated with the easureent keys. When used as an EXIT key, it will exit out of enu systes. 18

19 GETTING STARTED AUTO/ENTER Arrow Keys Auto Enter RANGE When used as an AUTO key, it will set the range of the selected function to autorange. When used as an ENTER key, it will confir the entered value or enu ite. The arrow keys are used to navigate the enu syste and edit values. RANGE The Up and Down arrow keys will also anually set the range for the voltage and current easureents. The Left and Right arrow keys will also toggle the refresh rate between the fast, ediu and slow (F, M, S) rates. Display Overview Priary easureent function icons Priary easureent units GDM-8351 AC DC 2W4W AUTO F M S HOLDRELMIN MAX RATIO UNCAL MEMUSBSTOnμF C M F k Secondary Display Counts Dual Measureent Multieter RMT n μ F C F S W S W M k W Hz W Hz V A V A ACDC2W4WAUTOMATHLIMITERRSHIFTEXTdB % db 2NDCOMPSTORCLFILTRS232LANUSBGPIBREAR Secondary easureent units Secondary easureent function icons Priary Display Function status icons Priary Measureent Function Icons Displays the priary easureent function. 19

20 GDM-8351 User Manual Priary Measureent Units Secondary Display Secondary Measureent Units Secondary Measureent function icons Function Status Icons Priary Display Displays the units for the priary easureent function. Displays the results of the secondary easureent. Displays the units for the secondary easureent function. Displays the secondary easureent function. Display status icons for operations/functions that are not linked to the priary or secondary functions. Displays the results of the priary easureent. 20

21 H.F L.F PASS EOM SET1 SET2 SET3 SET4 TRIG IN GND 100 GETTING STARTED Rear Panel Digital I/O port Fuse 0.125AT/ 0.063AT Power Cord Socket DIGITAL I / O LINE RATING 50 / 60 Hz 15VA MAX. 120 FUSE LINE 100VAC 0.125AT 120VAC 220VAC 0.063AT 240VAC DISCONNECT POWER CORD AND TEST LEADS BEFORE REPLACING FUSE RS232 WARNING SER.NO. LABEL TO AVOID SHOCK, REMOVE INPUTS BEFORE OPENING. USB Device Port RS232 Port Digital I/O Port DIGITAL I / O H.F L.F PASS EOM TRIG GND SET1 SET2 SET3 SET4 IN The Digital I/O port is used for outputting the coparison test results, external triggering and as a user-defined output port. See page 89. Power Cord Socket Accepts the power cord. AC 100/120/220/240V ±10%, 50/60Hz For power on sequence, see page 24. Fuse Socket 120 Holds the ain fuse: /120 VAC: 0.125AT 220/240 VAC: 0.063AT For fuse replaceent details, see page

22 GDM-8351 User Manual RS232 USB Device Port RS232 RS232 port. This port is used for reote control. See page 94. Type B USB port. This port is used for reote control. See page

23 GETTING STARTED Set Up Tilting the Stand Fro the base of the handle, gently pull the handle out sideways and then rotate it to one of the following positions. Horizontal position Tilt stand position Carry position 23

24 GDM-8351 User Manual Power Up Steps 1. Ensure the correct line voltage is lined up with the arrow on the fuse holder. If not, see page 141 to set the line voltage and fuse. 2. Connect the power cord to the AC voltage input. Note Make sure the ground connector on the power cord is connected to a safety ground. This will influence the easureent accuracy. 3. Push to turn on the ain power switch on the front panel. POWER 4. The display turns on and shows the last function that was used before the power was reset. 24

25 GETTING STARTED How to Use the Instruent Background Using the Function keys The following section will introduce to you how to access the basic functions on the DMM as well as how to navigate the enu syste and edit the paraeter values. Any of the priary functions can be used by siply pressing the desired function key. For exaple: To activate the DCV function, press the DCV key. DCI DCV To activate a secondary function, first press the SHIFT key followed by the function key for the secondary function. For exaple: To activate DCI easureent, first press the SHIFT key. SHIFT will be highlighted on the display. Next, press the DCV function key. This will activate the DCI ode. SHIFT DCI EXIT DCV 25

26 GDM-8351 User Manual Navigating the Menu Syste The enu syste is navigated with the Up, Down, Left and Right arrow keys, the Auto/Enter key and the SHIFT/EXIT key. RANGE Auto Enter SHIFT EXIT RANGE To enter the enu syste, press the MENU key. See page 139 for the Syste Menu tree. db MENU Pressing the Left and Right arrow keys will navigate to each of the enu ites on the current enu level. Pressing the Down key will go down to the next level of the enu tree. Conversely pressing the Up key will allow you to go back to the previous enu level. Pressing Down or Enter on the last ite in a enu tree will allow you to edit the settings or paraeters for that particular ite or setting. Pressing the Exit key will allow you to exit fro the current settings and return to the previous enu tree level. 26

27 GETTING STARTED Editing a Setting or Paraeter When you access a enu or paraeter setting, the Up, Down, Left and Right keys can be used again to edit the paraeter as well. RANGE Auto Enter RANGE If a setting or paraeter is flashing, it indicates that that particular paraeter can be edited. Pressing the Left or Right arrow key will allow you to select a digit or character to edit. Pressing the Up or Down keys will allow you to edit the selected character. 27

28 GDM-8351 User Manual OPERATION Basic Measureent Overview Refresh Rate Reading Indicator Autoatic/Manual Triggering AC/DC Voltage Measureent Select the Voltage Range Voltage Conversion Table Crest Factor Table AC/DC Current Measureent Select the Current Range Resistance Measureent Select the Resistance Range Diode Test Capacitance Measureent Select the Capacitance Range Continuity Test Set Continuity Threshold Continuity Beeper Settings Frequency/Period Measureent Frequency/Period Settings Teperature Measureent Set the Teperature Units Select Therocouple Type

29 OPERATION Set the Reference Junction Teperature Dual Measureent Overview Supported dual easureent odes Using Dual Measureent Mode Advanced Measureent Overview Supported Advanced Measureent Functions db/db/w Measureent db/db Calculation Measuring db/w Measure db Max/Min Measureent Relative Measureent Hold Measureent Copare Measureent Math Measureent Math Measureent Overview Measure MX+B Measure 1/X Measure Percentage

30 GDM-8351 User Manual Basic Measureent Overview Refresh Rate Background The refresh rate defines how frequently the DMM captures and updates easureent data. A faster refresh rate yields a lower accuracy. A slower refresh rate yields a higher accuracy. Consider these tradeoffs when selecting the refresh rate. For further details, please see the specifications. Refresh rate (Reading/S) Steps Function S M F Continuity/Diode DCV/DCI ACV/ACI Frequency/Period Teperature Resistance Capacitance Press the left or right arrow keys to change the refresh rate. 2. The refresh rate will be shown at the top of the display. F M S Note The refresh rate cannot be set for capacitance easureent. 30

31 OPERATION Reading Indicator Overview 1. The reading indicator next to the 1st display flashes according to the refresh rate setting. V Autoatic/Manual Triggering Overview By default, the GDM-8351 autoatically triggers according to the refresh rate. See the previous page for refresh rate setting details. The TRIG IN pin of the digital I/O port or the *TRG reote coand can be used to anually trigger acquisition when the trigger ode is set to EXT. See page 86 for trigger setting details. Note Manual triggering is not supported for capacitance easureents. 31

32 GDM-8351 User Manual AC/DC Voltage Measureent The GDM-8351 can easure up to 750VAC or 1000VDC, however the CATII easureent is only rated up to 600V. Set to ACV/DCV Measureent 1. Press the DCV or ACV key to easure DC or AC voltage. For AC + DC voltage, press the ACV and DCV keys at the sae tie. 2. The ode will switch to AC, DC or AC+DC ode iediately, as shown below. AC & DC indicator Voltage units Measureent range ACDC2W4WAUTO F M S HOLDRELMINMAX C M F k RMT S W Hz V W A %db S W W Hz V A ACDC 2W4WAUTOMATHLIMITERRSHIFTEXTdB 2NDCOMPSTORCLFILT SWEEPCCCVGPIBREAR C M F k Connection Connect the test lead between the VΩ and the COM terinal. The display updates the reading. SENSE W 4W INPUT V W H I 200Vpk 1000V 750V LO COM 500Vpk 10A 1A CAT II 600V FUSE 1.25A/1000V 32

33 OPERATION Select the Voltage Range The voltage range can be set autoatically or anually. Auto Range Manual Range Selectable Voltage Ranges Note Note To turn the autoatic range selection On/Off, press the AUTO key. Press the Up or the Down key to select the range. The AUTO indicator turns Off autoatically. If the appropriate range is unknown, select the highest range. Range Resolution Full scale 100V 1μV 120V 1V 10μV 1.2V 10V 0.1V 12V 100V 1V 120V 750V (AC) 10V 765V 1000V (DC) 10V 1020V For further details, please see the specifications on page 145. DC voltages with AC coponents cannot be accurately easured if the DC+AC coponent exceeds the dynaic range for the selected DC range. Any voltage exceeding the dynaic range will be clipped at the upper/lower range liit. Under these conditions the range that is chosen with the Auto range function ay be too sall. 33

34 GDM-8351 User Manual For exaple: Dynaic Range 0V Dynaic Range A B C D E A,B: Input exceeds the dynaic range. C,D: The DCV offset causes the input to exceed the upper dynaic range. E: The DCV offset causes the input to exceed the lower dynaic range. The DC voltage range should be anually selected when all of the following conditions are true: When DCV easureent is used. When the signals being easured contain both DC and AC coponents. When the aplitude of the AC coponent in the easured signal is higher or lower than the dynaic range of the range being currently selected by the auto-range function. Maxiu DCV Dynaic Range Selected DCV Range DC 100V DC 1V DC 10V DC 100V DC 1000V Dynaic Range ±180Vax ±1.8Vax ±18Vax ±180Vax ±1000Vax 34

35 OPERATION Voltage Conversion Table This table shows the relationship between an AC and DC reading for various wavefors. Wavefor Peak to Peak AC (True RMS) DC Sine PK-PK Rectified Sine (full wave) PK-PK Rectified Sine (half wave) PK-PK Square PK-PK Rectified Square PK-PK Rectangular Pulse K X Y PK-PK K= D=X/Y 2) ( D D 2D D=X/Y Triangle Sawtooth PK-PK 35

36 GDM-8351 User Manual Crest Factor Table Background Crest factor is the ratio of the peak signal aplitude to the RMS value of the signal. It deterines the accuracy of AC easureent. If the crest factor is less than 3.0, voltage easureent will not result in error due to dynaic range liitations at full scale. If the crest factor is ore than 3.0, it usually indicates an abnoral wavefor as seen fro the below table. Crest Factor Table Wavefor Shape Crest factor Square wave 1.0 Sine wave Triangle sawtooth Mixed frequencies ~ 2.0 SCR output 100% ~ 10% ~ 3.0 White noise 3.0 ~ 4.0 AC Coupled pulse train >3.0 Spike >9.0 36

37 OPERATION AC/DC Current Measureent The GDM-8351 series DMMs have two input terinals for current easureent. A 1A terinal for current less than 1A and a 10A terinal for easureents up to 10A. The units can easure 0 ~ 10A for both AC and DC current. Set to ACI/DCI Measureent 1. Press SHIFT DCV or SHIFT ACV to easure DC or AC current, respectively. For AC+DC current, press SHIFT followed by both the DCV and ACV key at the sae tie. 2. The ode will switch to AC, DC or AC+DC ode iediately, as shown below. AC & DC indicator Current units Measureent range ACDC2W4WAUTO F M S HOLDRELMINMAX C M F k RMT S W Hz V W A %db S W W Hz V A ACDC 2W4WAUTOMATHLIMITERRSHIFTEXTdB 2NDCOMPSTORCLFILT SWEEPCCCVGPIBREAR C M F k Connection Connect the test lead between the 10A terinal and the COM terinal or DC/AC 1A terinal and the COM terinal, depending on the input current. For current 1A use the 1A terinal; For current up to 10A use the 10A terinal. The display updates the reading. 37

38 GDM-8351 User Manual SENSE W 4W INPUT V W H I 200Vpk 1000V 750V LO COM 500Vpk Max 1A 10A CAT II 600V 1A FUSE 1.25A/1000V Max 10A 38

39 OPERATION Select the Current Range The current range can be set autoatically or anually. Auto Range To turn the autoatic range selection On/Off, press the AUTO key. The ost appropriate range for the currently used input jack will be autoatically selected. The DMM is able to do this by reebering the last anually selected range and using that inforation to deterine the sallest current range that the auto-range function will switch to. When the current input is switched to another terinal, the range ust be anually set. Manual Range Selectable Current Ranges Note Press the Up or the Down key to select the range. The AUTO indicator turns Off autoatically. If the appropriate range is unknown, select the highest range. Range Resolution Full scale INJACK 10A 100nA 12A 1A 100A 1μA 120A 1A 1A 100μA 1.2A 1A 10A 1A 12A 10A For further details, please see the specifications on page

40 GDM-8351 User Manual Note DC currents with AC coponents cannot be accurately easured if the DC+AC coponent exceed the dynaic range for the selected DC range. Any current exceeding the dynaic range will be clipped at the upper/lower range liit. Under these conditions the range that is chosen with the Auto range function ay be too sall. For exaple: Dynaic Range 0A Dynaic Range A B C D E A,B: Input exceeds the dynaic range. C,D: The DCI offset causes the input to exceed the upper dynaic range. E: The DCI offset causes the input to exceed the lower dynaic range. The DC current range should be anually selected when all of the following conditions are true: When DCI easureent is used. When the signals being easured contain both DC and AC coponents. When the aplitude of the AC coponent in the easured signal is higher or lower than the dynaic range of the range being currently selected by the auto-range function. 40

41 OPERATION Maxiu DCI Dynaic Range Selected DCI Range DC 10A DC 100A DC 1A DC10A Dynaic Range ± 30A ax ± 300A ax ± 1.25A ax ± 12A ax 41

42 GDM-8351 User Manual Resistance Measureent Measureent Type 2-wire 4-wire Uses the standard V-COM ports. Recoended for easuring resistances larger than 1kΩ. Copensates the test lead effect using the 4W copensation ports(hi/lo sense ports), in addition to the standard V-COM ports. Recoended for easuring sensitive resistances saller than 1kΩ. Set to 2W or 4W Measureent 1. Press the 2W/4W key once to activate 2W resistance easureent. Press the 2W/4W key twice to activate 4W resistance easureent. 2. The ode will switch to the selected resistance ode iediately, as shown below. Display 2W/4W indicator Resistance units Measureent range ACDC2W4WAUTO F M S HOLDRELMINMAX C M F k RMT S W Hz V W A %db S W W Hz V A ACDC 2W4WAUTOMATHLIMITERRSHIFTEXTdB 2NDCOMPSTORCLFILT SWEEPCCCVGPIBREAR C M F k Connection For 2W easureent, connect the test leads between the VΩ terinal and the COM terinal. For 4W easureent, connect the test leads between the VΩ terinal and the COM terinal, as you would for 2W easureent. Connect the sense leads between the LO and HI sense terinals. 42

43 OPERATION 4W only H I SENSE W 4W INPUT V W 4W & 2W 200Vpk 1000V 750V LO COM 500Vpk 10A CAT II 600V 1A FUSE 1.25A/1000V 4W only 43

44 GDM-8351 User Manual Select the Resistance Range The resistance range can be set autoatically or anually. Auto Range Manual Range Selectable Resistance Ranges Note To turn the autoatic range selection On/Off, press the AUTO key. Press the Up or the Down key to select the range. The AUTO indicator turns Off autoatically. If the appropriate range is unknown, select the highest range. Range Resolution Full scale 100Ω 1Ω 120Ω 1kΩ 10Ω 1.2kΩ 10kΩ 100Ω 12kΩ 100kΩ 1Ω 120kΩ 1MΩ 10Ω 1.2MΩ 10MΩ 100Ω 12MΩ 100MΩ 1kΩ 120MΩ For further details, please see the specifications on page

45 OPERATION Diode Test The diode test checks the forward bias characteristics of a diode by running a constant forward bias current of approxiately 1A through the DUT. Set to Diode Measureent 1. Press the / key once to activate diode easureent. Note: pressing the / key twice will activate the continuity easureent instead. 2. The ode will switch to Diode ode iediately, as shown below. Display Diode state Diode function indicator DC2W4WAUTO F M S HOLDRELMINMAX C M F k RMT S W Hz V W A %db ACDC 2W4WAUTOMATHLIMITERRSHIFT 2NDCOMPSTORCLFILT SWEEPCCCV Connection Connect the test lead between the VΩ terinal and COM terinal; Anode-V, Cathode-COM. The display updates the reading. SENSE W 4W INPUT V W H I 200Vpk 1000V 750V LO COM 500Vpk 10A 1A CAT II 600V FUSE 1.25A/1000V 45

46 GDM-8351 User Manual Capacitance Measureent The capacitance easureent function checks the capacitance of a coponent. Set to Capacitance Measureent Display 1. Press the SHIFT / ( ) keys to activate capacitance easureent. 2. The ode will switch to capacitance ode iediately, as shown below. Capacitance indicator Capacitance units Measureent range ACDC2W4WAUTO F M S HOLDRELMINMAX μf C M F k RMT S W Hz V W A %db S W W Hz V A ACDC 2W4WAUTOMATHLIMITERRSHIFTEXTdB 2NDCOMPSTORCLFILT SWEEPCCCVGPIBREAR C M F k Connection Connect the test lead between the VΩ terinal and COM terinal; Positive-V, Negative-COM. The display updates the reading. SENSE W 4W INPUT V W H I 200Vpk 1000V 750V LO COM 500Vpk 10A 1A CAT II 600V FUSE 1.25A/1000V 46

47 OPERATION Select the Capacitance Range The capacitance range can be set autoatically or anually. Auto Range Manual Range Selectable Capacitance Ranges Note Note To turn the autoatic range selection On/Off, press the AUTO key. Press the Up or the Down key to select the range. The AUTO indicator turns Off autoatically. If the appropriate range is unknown, select the highest range. Range Resolution Full scale 10nF 10pF 12nF 100nF 100pF 120nF 1μF 1nF 1.2μF 10μF 10nF 12μF 100μF 100nF 120μF For further details, please see the specifications on page 149. The refresh rate settings and the EXT trigger cannot be used in the capacitance ode. 47

48 GDM-8351 User Manual Continuity Test The continuity test checks that the resistance in the DUT is low enough to be considered continuous (of a conductive nature). Procedure 1. Press the / key twice to activate continuity testing. Note: pressing the / key once will activate diode testing. 2. The ode will switch to continuity testing iediately, as shown below. Display Continuity state Continuity function indicator S W Connection Connect the test lead between the VΩ terinal and COM terinal. The display updates the reading. SENSE W 4W INPUT V W H I 200Vpk 1000V 750V LO COM 500Vpk 10A 1A CAT II 600V FUSE 1.25A/1000V 48

49 OPERATION Set Continuity Threshold The continuity threshold defines the axiu resistance allowed in the DUT when testing the continuity. Range Threshold 0 to 1000Ω (Default Threshold:10Ω) Resolution 1Ω Procedure 1. Press MENU. 2. Go to the MEAS enu on level 1 3. Go to the CONT enu on level 2 4. Set the continuity threshold level in ohs. 5. Press the Enter key to confir the continuity settings. 6. Press EXIT to exit the CONT setting enu. Display Continuity setting Continuity function indicator W 49

50 GDM-8351 User Manual Continuity Beeper Settings The beeper setting defines how the GDM-8351 notifies the continuity test result to the user. Note: When the Beeper setting is off it will also turn off the keypad tones as well as any error or warning tones. Range PASS Beeps when the continuity passes. FAIL Beeps when the continuity fails. OFF Beeper is turned off. Procedure 1. Press MENU. 2. Go to the SYSTEM enu on level 1 3. Go to the BEEP enu on level 2 4. Set the BEEP setting to PASS, FAIL or OFF. 5. Press the Enter key to confir the beeper settings. 6. Press EXIT to exit the BEEP setting enu. Display Beep setting Beep enu indicator 50

51 OPERATION Frequency/Period Measureent The GDM-8351 can be used to easure the frequency or period of a signal. This function can easure either the voltage frequency/period or current frequency/period, depending on which jack the input signal is input fro. Range Frequency 10Hz~1MHz Period 1.0μs ~100s Procedure To easure frequency, press the Hz/P key once. The frequency will be displayed on the priary screen and the range will be displayed on the secondary display. To easure the period, press the Hz/P key twice. The period will be displayed on the priary screen and the range will be displayed on the secondary display. Display Measureent Frequency or period units Voltage/Current range setting ACDC2W4WAUTO F M S HOLDRELMINMAX nμf C M F k RMT S W Hz V W A %db S W W Hz V A ACDC 2W4WAUTOMATHLIMITERRSHIFTEXTdB 2NDCOMPSTORCLFILT SWEEPCCCVGPIBREAR C M F k Connection Connect the test lead between the VΩ terinal and the COM terinal. The display updates the reading. SENSE W 4W INPUT V W H I 200Vpk 1000V 750V LO COM 500Vpk 51

52 GDM-8351 User Manual Frequency/Period Settings The input voltage/current range for frequency/period easureents can be set to Auto range or to Manual. By default, the voltage/current range is set to Auto for both the period and frequency. Range Voltage 100V, 1V, 10V, 100V, 750V Current 10A, 100A, 1A, 10A Note Manual Range Autorange The input jack setting deterines whether the voltage frequency/period or current frequency/period is being easured. See page 80 for details. Set the range with the Up and Down keys. The AUTO indicator will turn off when a new range is selected. 1. Press the Auto/Enter key. 2. AUTO will be displayed on the screen again. Display Autorange indicator Voltage/Current range setting ACDC2W4WAUTO F M S HOLDRELMINMAX nμf C M F k RMT S W Hz V W A %db S W Hz V ACDC 2W4WAUTOMATHLIMITERRSHIFTEXTdB 2NDCOMPSTORCLFILT SWEEPCCCVGPIBREAR C M F k Note Pressing the 2nd key twice will toggle the view of the second display between the voltage/current range and the enu function (FREQ or PERIOD). Note that the voltage/current range can actually still be set even when the secondary display has been toggled to show the enu function. 52

53 OPERATION Teperature Measureent The GDM-8351 can easure teperature using a therocouple. To easure teperature, the DMM accepts a therocouple input and calculates the teperature fro the voltage fluctuation. The therocouple type and reference junction teperature are also considered. Teperature Range & Type Procedure Therocouple: -200 C ~ +300 C Type: J, K, T To ake teperature easureents, press SHIFT 2W/4W (TEMP). The teperature ode appears showing the teperature on the priary display and the type of sensor on the secondary display. Display Measureent Tep. units Sensor type ACDC2W4WAUTO F M S HOLDRELMINMAX nμf C M F k RMT S W Hz V W A %db C M ACDC 2W4WAUTOMATHLIMITERRSHIFTEXT 2NDCOMPSTORCLFILT SWEEPCCCVGPIB F k Connection Connect the sensor lead between the VΩ terinal and the COM terinal. The display updates the reading. SENSE W 4W INPUT V W H I 200Vpk 1000V 750V LO COM 500Vpk 10A 1A CAT II 600V FUSE 1.25A/1000V 53

54 GDM-8351 User Manual Set the Teperature Units Range Units C, F Procedure 1. Press the MENU key. 2. Go to TEMP on level Go to UNIT on level Select either C (Celsius) or F (Farenheit). 5. Press the Enter key to confir. 6. Press the EXIT key to exit fro the teperature enu. Display Teperature unit setting Unit enu indicator 54

55 OPERATION Select Therocouple Type The GDM-8351 accepts therocouple inputs and calculates the teperature fro the voltage difference of two dissiilar etals. Therocouple type and reference junction teperature are also considered. Therocouple type and range Procedure Type Measureent Range Resolution J -200 to +300 C 0.01 C K -200 to +300 C 0.01 C T -200 to +300 C 0.01 C 1. Press the MENU key. 2. Go to TEMP on level Go to SENSOR on level Select the therocouple type (J, K, T). 5. Press the Enter key to confir. 6. Press the EXIT key to exit fro the teperature enu. Display Therocouple type setting Sensor enu indicator 55

56 GDM-8351 User Manual Set the Reference Junction Teperature When a therocouple is connected to the DMM, the teperature difference between the therocouple lead and the DMM input terinal should be taken into account and be cancelled out; otherwise an erroneous teperature ight be added. The value of the reference junction teperature should be deterined by the user. Range SIM 0 ~ 50 C (default: C) Resolution 0.01 C Procedure 1. Press the MENU key. 2. Go to TEMP on level Go to SIM on level Set the SIM (siulated) reference junction teperature. 5. Press the Enter key to confir. 6. Press the EXIT key to exit fro the teperature enu. Display Reference junction teperature setting SIM enu indicator 56

57 OPERATION Dual Measureent Overview The dual easureent ode allows you to use the 2nd display to show another ite, thus allowing you to view two different easureent results on the screen. When the ultieter is used in dual easureent ode, both displays are updated fro either a single easureent or fro two separate easureents. If the priary and secondary easureent odes have the sae range, rate and rely on the sae fundaental easureent, then a single easureent is taken for both displays; such as ACV and frequency/period easureents. If the priary and secondary displays use different easureent functions, ranges or rates, then separate easureents will be taken for each display. For exaple, ACV and DCV easureents. Most of the basic easureent functions, except for resistance/continuity can be used in the dual easureent ode. Supported Dual Measureent Modes The following table lists all the easureent functions that are supported with the dual easureent function. Supported Dual Measureent odes Priary Display Secondary Display ACV DCV ACI DCI Hz/P Ω ACV X DCV X X ACI X DCI X X Hz/P X X X Ω X X X X X 57

58 GDM-8351 User Manual Using Dual Measureent Mode Procedure 1. Choose one of the basic easureent functions fro the table above to set the easureent ode for the priary display. For exaple, press DCV to set the first display to DCV easureent. 2. To set a easureent ode for the second display, press the 2ND key and then select the second easureent ode. For exaple, press 2ND, SHIFT, ACV(ACI) to select ACI easureent for the second display. Display Indicators for 1 st easureent 2 nd easureent and unit ACDC2W4WAUTO F M SHOLDRELMINMAX nμf C M F k RMT S V W W Hz A %db S W W Hz V A ACDC 2W4WAUTOMATHLIMITERRSHIFTEXTdB 2NDCOMPSTORCLFILT SWEEPCCCVGPIBREAR C M F k 1 st easureent and unit Indicators for 2 nd easureent 58

59 OPERATION Editing the Measureent Paraeters After the secondary easureent function has been activated, the rate, range and easureent ite can be edited for either the priary or secondary display. Note however, it is ore practical to configure the first or second easureent ites before activating dual easureent ode. To edit easureent paraeters in dual easureent ode, you ust first set which display is the active display. The 2ND icon under the secondary display deterines which display is the active display. Procedure 1. Toggle whether the priary or secondary display is the active display by pressing the 2ND key: Priary display is the active display: 2ND is not visible on the display. Secondary display is the active display: 2ND is visible on the display. Note Do not hold the 2ND key. This will turn the dual easureent ode off. 2. Edit the range, rate or easureent ite for the active display in the sae way as for single easureent operation. See the Basic Measureent chapter for details (page 30). Turn Off 2nd Measureent To turn Off the second easureent, press and hold the 2ND key for ore than 1 second. 59

60 GDM-8351 User Manual Connection The diagras below describe how to connect the DMM to easure a nuber of coon dual easureent ites. Voltage and Frequency/Period easureent SENSE W 4W INPUT V W H I 200Vpk 1000V 750V LO COM 500Vpk 10A 1A CAT II 600V FUSE 1.25A/1000V 60

61 OPERATION Voltage/Frequency/Period and Current Measureent SENSE W 4W INPUT V W Load H I 200Vpk 1000V 750V LO COM 500Vpk 0~1A 10A CAT II 600V 1A FUSE 1.25A/1000V 0~10A Note: DC Current easureents will be displayed as a negative value as the polarity of the current leads has been reversed. Please take into account the resistance of the test leads and internal resistance of the current connection as it is in series with the test circuit. The above easuring configuration is used to easure the voltage present on the resistance under test and the current through the resistance under test when using the DCI/DCV or ACI/ACV dual easureent function. 61

62 GDM-8351 User Manual Advanced Measureent Overview Advanced easureent ainly refers to the type of easureent which uses the result obtained by one of the basic easureents: ACV, DCV, ACI, DCI, Resistance, Diode/Continuity, Frequency/Period, and Teperature. Supported Advanced Measureent Functions The following table lists all the advanced easureent functions and which of the basic easureent functions that they support. Advanced Meas. ACV/ DCV Basic Measureent ACI/ DCI Ω Hz/P TEMP DIODE CAP db X X X X X X db X X X X X X Max/Min X Relative X Hold X X Copare X Math X X 62

63 OPERATION db/db/w Measureent db/db Calculation Overview Using the ACV or DCV easureent results, the DMM calculates the db or db value based on a reference resistance value in the following way: db= 10 x log 10 (1000 x Vreading 2 / Rref) db= db dbref W= Vreading 2 /Rref Where: Vreading= Input Voltage, ACV or DCV; Rref= Reference resistance siulating an output load; dbref= Reference db value Measuring db/w Procedure 1. Select ACV or DCV easureent. See page To easure db, press SHIFT MENU(dB) The priary display will show the db easureent while the secondary display shows the reference resistance. 63

64 GDM-8351 User Manual Display db easureent Reference resistance ACDC2W4WAUTO F M SHOLDRELMINMAX nμf C M F k RMT S W Hz V W A %db S W Hz V ACDC 2W4WAUTOMATHLIMITERRSHIFTEXTdB 2NDCOMPSTORCLFILT SWEEPCCCVGPIBREAR C M F k Setting the Reference Resistance To set the reference resistance, use the Up and Down arrow keys. The selectable reference resistances are shown below. Selectable reference resistances View the result in Watts When the reference resistance is less than 50Ω, it is possible to calculate the power (in watts). If the reference resistance is equal to or greater than 50Ω, then this step can be ignored. Press SHIFT MENU(dB) again to view the result in watts. Display Power easureent and unit Reference resistance ACDC2W4WAUTO F M SHOLDRELMINMAX nμf C M F k RMT S W Hz V W A %db S W W Hz V A ACDC 2W4WAUTOMATHLIMITERRSHIFTEXTdB 2NDCOMPSTORCLFILT SWEEPCCCVGPIBREAR C M F k Exit db Measureent Press SHIFT MENU(dB) again to exit the db easureent, or siply activate another easureent function. 64

65 OPERATION Measure db db is defined as [db dbref]. When the db easureent is activated, the DMM calculates the db using the reading at the first oent and stores it as dbref. Procedure 1. Select ACV or DCV easureent. See page Press the SHIFT Hz/P(dB) keys to activate the db easureent ode. The 1st display shows the db reading, the second display shows the voltage reading. Display db easureent Voltage reading ACDC2W4WAUTO F M SHOLDRELMINMAX nμf C M F k RMT S W Hz V W A %db S W W Hz V A ACDC 2W4WAUTOMATHLIMITERRSHIFTEXTdB 2NDCOMPSTORCLFILT SWEEPCCCVGPIBREAR C M F k View the db Reference Value To view the db reference value, press the 2ND key. The Up and Down arrow keys can also be used to change the voltage range or the reading. Exit db Measureent Press the SHIFT Hz/P(dB) keys again to exit the db easureent, or siply activate another easureent function. 65

66 GDM-8351 User Manual Max/Min Measureent Maxiu and Miniu easureent function stores the highest (axiu) or lowest (iniu) reading and shows it on the first display when the 2ND key is pressed. Applicable easureents Procedure The Max/Min function can be used with the following basic easureent functions: ACV, DCV, ACI, DCI, Ω, Hz/P, TEMP, For Max easureent, press the MX/MN key once. For Min easureent, press the MX/MN key twice. Display Basic eas. function Max/Min indicator Measureent range ACDC2W4WAUTO F M SHOLDRELMINMAX nμf C M F k RMT S W Hz V W A %db S W W Hz V A ACDC 2W4WAUTOMATHLIMITERRSHIFTEXTdB 2NDCOMPSTORCLFILT SWEEPCCCVGPIBREAR C M F k View Max/Min Value Press the 2ND key to view the Max or Min value. Display Max/Min reading Max/Min ode ACDC2W4WAUTO F M SHOLDRELMINMAX nμf C M F k RMT S W Hz V W A %db C M ACDC 2W4WAUTOMATHLIMITERRSHIFT 2NDCOMPSTORCLFILT SWEEPCCCV Deactivate Max/Min Measureent Hold the MX/MN key for two seconds to deactivate, or siply activate another easureent function. 66

67 OPERATION Relative Measureent Relative easureent stores a value, typically the data at that instant, as the reference. The easureent following the reference is displayed as the delta between the reference. The reference value will be cleared upon exiting. Applicable easureents Procedure The relative function can be used with the following basic easureent functions: ACV, DCV, ACI, DCI, Ω, Hz/P, TEMP, Press the REL key. The easureent reading at that instant becoes the reference value. Display Relative value Range ACDC2W4WAUTO F M SHOLDRELMINMAX nμf C M F k RMT S W Hz V W A %db S W W Hz V A ACDC 2W4WAUTOMATHLIMITERRSHIFTEXTdB 2NDCOMPSTORCLFILT SWEEPCCCVGPIBREAR C M F k View Relative Reference Value Press the 2ND key to view the relative reference value at full scale. Display Relative reference value ACDC2W4WAUTO F M SHOLDRELMINMAX nμf C M F k RMT S W Hz V W A %db S W W Hz V A ACDC 2W4WAUTOMATHLIMITERRSHIFTEXTdB 2NDCOMPSTORCLFILT SWEEPCCCVGPIBREAR C M F k 67

68 GDM-8351 User Manual Manually Set the Relative Reference Value 1. To anually set the relative reference value, press SHIFT REL(REL#). The REL value is displayed on the screen at full scale. 2. Use the Left and Right arrow keys to navigate to the digit to be edited or to select the decial point. Use the Up and Down arrow keys to edit the selected digit or to place the position of the decial point. ACDC2W4WAUTO F M SHOLDRELMINMAX nμf C M F k RMT S W Hz V W A %db S W W Hz V A ACDC 2W4WAUTOMATHLIMITERRSHIFTEXTdB 2NDCOMPSTORCLFILT SWEEPCCCVGPIBREAR C M F k 3. Press the Enter key to confir, alternatively press Exit to cancel setting the relative reference value. Display Relative value setting REL setting ode ACDC2W4WAUTO F M SHOLDRELMINMAX nμf C M F k RMT S V W W Hz A %db S W W Hz V A ACDC 2W4WAUTOMATHLIMITERRSHIFTEXTdB 2NDCOMPSTORCLFILT SWEEPCCCVGPIBREAR C M F k Deactivate Relative Measureent Press the REL key again to deactivate the Relative easureent ode, or siply activate another easureent function. 68

69 OPERATION Hold Measureent The Hold Measureent function retains the current easureent data and updates it only when it exceeds the set threshold (as a percentage of the retained value). Applicable easureents Procedure The hold function can be used with the following basic easureent functions: ACV, DCV, ACI, DCI, Ω, Hz/P, TEMP 1. Press the HOLD key. 2. The easureent reading appears on the priary display and the hold threshold on the secondary display. Display Measureent reading Hold threshold ACDC2W4WAUTO F M SHOLDRELMINMAX nμf C M F k RMT S W Hz V W A %db ACDC 2W4WAUTOMATHLIMITERRSHIFTEXTdB 2NDCOMPSTORCLFILT SWEEPCCCVGPIBREAR C M F k S W V Set the Hold Threshold Use the Up and Down arrow keys to select a hold threshold level, as a percentage. Range 0.01%, 0.1%, 1%, 10% Deactivate Hold Measureent Press the HOLD key for 2 seconds to deactivate the hold easureent, or siply activate another easureent function. 69

70 GDM-8351 User Manual Copare Measureent Copare easureent checks to see if the easureent data stays between a specified upper (high) and lower (low) liit. Applicable easureents Procedure The copare function can be used with the following basic easureent functions: ACV, DCV, ACI, DCI, Ω, Hz/P, TEMP, 1. Press SHIFT HOLD(COMP). 2. The high liit setting appears. Use the Left and Right arrow keys to navigate to the digit to be edited, or to select the decial point. Use the Up and Down arrow keys to edit the selected digit, or to place the position of the decial point. V 3. Press the Enter key to save the high liit setting and autoatically go on to the low liit setting. 4. Enter the low liit setting in the sae fashion as the high setting. 5. Press the Enter key to confir the low liit settings. 6. The copare easureent results will appear iediately: If the current easureent reading is between 70

71 OPERATION the high and low liits, PASS will be displayed on the secondary display, If the reading is below the low liit, LOW will be displayed. If the reading is above the high liit, HIGH will be displayed. Display Measureent reading Copare result ACDC2W4WAUTO F M SHOLDRELMINMAX nμf C M F k RMT S W Hz V W A %db C M ACDC 2W4WAUTOMATHLIMITERRSHIFTEXT 2NDCOMPSTORCLFILT SWEEPCCCVGPIB Deactivate Copare Measureent Press SHIFT HOLD(COMP) to deactivate copare easureents, or siply activate another easureent function. 71

72 GDM-8351 User Manual Math Measureent Math Measureent Overview Math easureent runs three types of atheatical operations, MX+B, 1/X and Percentage based on the other easureent results. Applicable Measureents Overview of Math Functions The ath function can be used with the following basic easureent functions: ACV, DCV, ACI, DCI, Ω, Hz/P, TEMP MX+B Multiplies the reading (X) by the factor (M) and adds/subtracts offset (B). 1/X Inverse. Divides 1 by the reading (X). Percentage Runs the following equation: (ReadingX - Reference) Reference x 100% Measure MX+B Procedure 1. Press SHIFT MX/MN(MATH) to enter the MATH enu. The MX+B setting appears. The M factor will be flashing, indicating that the M factor is to be set. 2. Use the Left and Right arrow keys to navigate to the digit to be edited or to select the decial point. Use the Up and Down arrow keys to edit the selected digit or to place the position of the 72

73 OPERATION decial point. 3. Press Enter to confir the M factor settings and to autoatically ove onto the B offset setting. 4. Edit the B offset in the sae fashion as the M factor was edited. 5. Press Enter to confir the B offset setting and to begin the MX+B easureent. Display MX+B eausureent reading MX+B ath indicator ACDC2W4WAUTO F M SHOLDRELMINMAX nμf C M F k RMT S W Hz V W A %db C M ACDC 2W4WAUTOMATHLIMITERRSHIFTEXT 2NDCOMPSTORCLFILT SWEEPCCCVGPIB Deactivate Math Measureent Press SHIFT MX/MN(MATH) to deactivate the MATH function, or siply activate another easureent function. Measure 1/X Procedure 1. Press SHIFT MX/MN(MATH) to enter the MATH enu. The MX+B setting appears. 2. Press the Down key twice to skip past MX+B settings and go to the 1/X settings. 1/X will be flashing in the secondary display. 73

74 GDM-8351 User Manual 3. Press Enter to activate the 1/X ath function. The results begin iediately. Display 1/X easureent 1/X ath indicator ACDC2W4WAUTO F M SHOLDRELMINMAX nμf C M F k RMT S W Hz V W A %db C M ACDC 2W4WAUTOMATHLIMITERRSHIFT 2NDCOMPSTORCLFILT SWEEPCCCVGPIB Deactivate Math Measureent Press the SHIFT MX/MN(MATH) to deactivate the MATH function, or siply activate another easureent function. Measure Percentage Procedure 1. Press SHIFT MX/MN to enter the MATH enu. 2. The MX+B setting appears. Press the Up key to skip past MX+B settings and go to the REF% settings. REF% will be flashing in the secondary display. 3. Use the Left and Right arrow keys to navigate to the digit to be edited or to select the decial point. Use the Up and Down arrow keys to edit the selected digit or to place the position of the decial point. 74

75 OPERATION 4. Press Enter to confir the REF% setting and to begin the Percentage easureent. Display Calculated percentage eausureent % function indicator DC AUTO S V MATH Deactivate Math Measureent Press SHIFT MX/MN to deactivate the MATH function, or siply activate another easureent function. 75

76 GDM-8351 User Manual SYSTEM/DISPLAY CONFIGURATION View Serial Nuber View Version Nuber Brightness Settings Input Resistance Settings Frequency/Period Input Jack Settings Digital Filter Digital Filter Overview Digital Filter Type Settings Restore Factory Default Settings Trigger Trigger Settings External Trigger

77 SYSTEM/DISPLAY CONFIGURATION View Serial Nuber Procedure 1. Press the MENU key. 2. Go to SYSTEM on level Go to S/N on level The serial nuber will be displayed across both the priary and secondary display. Display ACDC2W4WAUTO F M SHOLDRELMINMAX nμf C M F k RMT S V W W Hz A S W W Hz V A ACDC 2W4WAUTOMATHLIMITERRSHIFTEXTdB C M F k %db 2NDCOMPSTORCLFILT SWEEPCCCVGPIBREAR Exit Press the EXIT key twice to go back to the easureent screen. View Version Nuber Procedure 1. Press the MENU key. 2. Go to FW on level Go to VER on level The firware version nuber will be displayed in the secondary display. 5. Press Exit to exit fro the version enu. Display Note For details about firware updates, please contact the GW Instek Service Center or visit the GW Instek website at 77

78 GDM-8351 User Manual Brightness Settings The display has 5 settable brightness levels. Range Brightness 1 (di) ~ 5 (bright) Procedure 1. Press the MENU key. 2. Go to SYSTEM on level Go to LIGHT on level Set the light setting between 1 (di) and 5 (bright). 5. Press the Enter key to confir. 6. Press the EXIT key to exit fro the brightness settings. Display Brightness setting 78

79 SYSTEM/DISPLAY CONFIGURATION Input Resistance Settings The 100V and 1V DC voltage ranges can be set to an input resistance of 10MΩ or 10GΩ. This setting is only applicable for DC voltage. Range Procedure Input resistance 10MΩ, 10GΩ Default 10MΩ 1. Press the MENU key. 2. Go to MEAS on level Go to INPUT R on level Set the input resistance to 10MΩ or 10GΩ 5. Press the Enter key to confir. 6. Press the EXIT key to exit fro the input resistance enu. Display Input resistance setting 79

80 GDM-8351 User Manual Frequency/Period Input Jack Settings The INJACK settings set which input terinal is used for frequency or period easureents. Range Injack VOLT, 1A, 10A Default VOLT Procedure 1. Press the MENU key. 2. Go to MEAS on level Go to INJACK on level Set the INJACK setting to either VOLT, 1A or 10A. 5. Press the Enter key to confir. 6. Press the EXIT key to exit fro the INJACK enu. Display INJACK setting 80

81 SYSTEM/DISPLAY CONFIGURATION Digital Filter Digital Filter Overview Filter Basics Filter Type Moving Filter The digital filter converts the analog input signal into digital forat before passing it to the internal circuits for processing. The filter affects the aount of noise included in the easureent result. The digital filter averages a specific nuber of input signal saples to generate one reading. The filter type defines the averaging ethod. The following diagras show the differences between each filter type, using 4 saples per reading as an exaple. The oving filter takes in one new saple and discards the oldest saple per reading. This is the default behavior when the digital filter is not specified, and is recoended for ost applications. 3rd reading Saple 3-6 2nd reading Saple 2-5 1st reading Saple 1-4 Saple # Repeating Filter The repeating filter renews all the saples per reading. 1st reading Saple 1-4 2nd reading Saple 5-8 3rd reading Saple 9-12 Saple #

82 GDM-8351 User Manual Filter Count Filter count defines the nuber of saples to be averaged per reading. More saples offer low noise but a longer delay between easureents. Less saples offer high noise but a shorter delay between easureents. Range: 2 ~ 320 Filter Window The filter window defines the threshold for when the digital filter data is updated again. When the AD data falls in the range between TH and TL, the filter keeps processing. When the AD data falls out of the range between TH and TL, the filter will restart. When easuring unstable signals, appropriately setting the filter window can iprove the easureent speed. AD data Restart Filter Restart TH Filter TH TL TL Filter TH TL Tie TH: Threshold High, TL: Threshold Low Filter Window Forula Previous data*(1-window)< threshold< previous data*(1+window). Range: 10%, 1%, 0.1%, 0.01% and none 82

83 SYSTEM/DISPLAY CONFIGURATION Digital Filter Type Settings Procedure 1. Press SHIFT FILTER(TYPE) to enter the (Digital Filter) Type settings enu. 2. Use the Left and Right arrow keys to navigate to the filter type setting or to select the digit to be edited. Use the Up and Down arrow keys to edit the selected digit or to toggle the filter type (REP<>MOV). ACDC2W4WAUTO F M SHOLDRELMINMAX nμf C M F k RMT S W Hz V W A %db S W W Hz V A ACDC 2W4WAUTOMATHLIMITERRSHIFTEXTdB 2NDCOMPSTORCLFILT SWEEPCCCVGPIBREAR C M F k 3. Press Enter to confir the filter type and the CNT setting. The DMM will now autoatically go to the WINDOW setting. 4. Use the Up and Down arrow keys to set the window threshold settings. ACDC2W4WAUTO F M SHOLDRELMINMAX nμf C M F k RMT S V W W Hz A %db S W W Hz V A ACDC 2W4WAUTOMATHLIMITERRSHIFTEXTdB 2NDCOMPSTORCLFILT SWEEPCCCVGPIBREAR C M F k 5. Press Enter to confir the settings. 6. Press EXIT to cancel. 83

84 GDM-8351 User Manual Display Filter indicator ACDC2W4WAUTO F M S HOLDRELMINMAX C M F k RMT S W Hz V W A %db S W W Hz V A ACDC 2W4WAUTOMATHLIMITERRSHIFTEXTdB 2NDCOMPSTORCLFILT SWEEPCCCVGPIBREAR C M F k Deactivate Digital Filter Press FILTER to deactivate the FILTER function. 84

85 SYSTEM/DISPLAY CONFIGURATION Restore Factory Default Settings The factory default settings can be restored at anytie fro the Syste enu. Please see the Appendix on page 140 for a list of the factory default settings. Range Factory DEF YES, NO Procedure 1. Press the MENU key. 2. Go to SYSTEM on level Go to FACTORY on level Set the (FACTORY) DEF setting to YES or NO. Choosing YES will restore the factory default settings. 5. Press the Enter key to confir and to restore the factory default settings iediately. OK DEF will be displayed when the default settings are restored. Display Factory default setting 85

86 GDM-8351 User Manual Trigger The easureents can be triggered internally or externally. When set to internal, the DMM will be triggered autoatically according the refresh rate. When set to external, the DMM will wait for an external trigger signal fro the Digital I/O port or fro the *TRG coand. See page 88 & 137 for ore details. Trigger Settings Range Trigger INT, EXT Procedure 1. Press the MENU key. 2. Go to MEAS on level Go to TRIG on level Set the TRIG setting to either INT or EXT. 5. Press the Enter key to confir. 6. Press the EXIT key to exit fro the TRIG enu. Display INJACK setting ACDC2W4WAUTO F M SHOLDRELMINMAX nμf C M F k RMT S W Hz V W A %db C M ACDC 2W4WAUTOMATHLIMITERRSHIFT 2NDCOMPSTORCLFILT SWEEPCCCVGPIB 86

87 SYSTEM/DISPLAY CONFIGURATION External Trigger The external trigger uses the digital I/O pin for anual triggering of the DMM. Pin 5 of the digital I/O port is norally high. To trigger the DMM a low pulse of 10μs is needed. The *TRG coand can also be used to externally trigger the DMM when the DMM is in the external trigger ode. See page 137 for details. Digital I/O Pin 5 Digital I/O Terinal Trigger input Pin 6 10μs 87

88 GDM-8351 User Manual DIGITAL I/O Digital I/O Overview Noral Mode User Mode

89 DIGITAL I/O Digital I/O Overview The Digital I/O port is a dual function port. By default (Noral Mode) the port is used with the copare function to output Hi Fail, Lo Fail, Pass, and EOM (end of easureent) signals. In addition there is also a TRIG IN input pin. As a secondary function (User Mode), the Digital I/O port can have the output state of pins 1 ~4 controlled via reote control. Pinout DIGITAL I / O H.F L.F PASS EOM SET1 SET2 SET3 SET4 TRIG IN GND Pin No. Noral Mode User Mode 1 High Fail Set 1 2 Low Fail Set 2 3 Pass Set 3 4 EOM Set 4 5 TRIG IN TRIG IN 6 Ground Ground 89

90 GDM-8351 User Manual Wiring Diagra Pins 1 ~ 4 Pins 1 ~ 4 are open-collector outputs, with a ax input of 30A. All outputs are active low. Digital I/O Terinal Pin 1-4 Ext Vcc Iax = 30A Vo Wiring Diagra Trig In (Pin 5) Digital I/O Terinal Pin 5 Pin 6 Trigger input Noral Mode Overview The Noral Mode outputs the pass/fail results of the Copare function. Each signal is an active low signal. In addition an active low pulse of approxiately 5µs is output to indicate the end of copare easureent (EOM). When the input signal exceeds the high threshold or the low threshold, the High Fail or Low Fail pin is pulled low. When the signal stays within the threshold levels, the Pass pin is pulled low. 90

91 DIGITAL I/O Tiing Diagra Copare On Pin 1-4 Output H High liit Copare Off Low liit Pin 1 HIGH FAIL L P P P EOM Pin 2 LOW FAIL Pin 3 PASS Pin 4 EOM User Mode User ode can only used when using a reote control interface. Likewise this ode can only be enabled or disabled via reote control. Please see the digital I/O coands on page 133 for full usage details. Related Coands DIGitalio:MODE {USER NORM?} DIGitalio{X}:SETup {ON OFF} Procedure 1. Connect to the GDM-8351 reotely, see page 93 for reote control options. 2. Enable the user ode using the DIGitalio:MODE coand. See page Set the state of pins 1 ~ 4 using the DIGitalio{X}:SETup coand. See page

92 GDM-8351 User Manual Exaple DIG:MODE? >NORM DIG:MODE USER DIG1:SETup ON DIG2:SETup ON DIG3:SETup ON DIG4:SETup ON DIG4:SETup? >1 DIG:MODE NORM Queries the ode. Returns Nor ode. Sets to USER ode. Turns pin1 output on. Turns pin2 output on. Turns pin3 output on. Turns pin4 output on. Queries pin4 output state. Returns pin4 output state. Sets back to NORM ode. 92

93 REMOTE CONTROL REMOTE CONTROL This chapter describes basic configuration of IEEE488.2 based reote control. For a coand list, refer to the Coand Overview chapter on page 99. Configure Reote Control Interface USB Interface Configure USB Interface Configure RS232 Interface Configure EOL Character Return to Local Control

94 GDM-8351 User Manual Configure Reote Control Interface USB Interface The USB device port on the rear panel is used for reote control. The USB port can be configured as either a TMC or CDC interface. When configured as a TMC interface, the DMM can be controlled using National Instruents NI-Visa software*. NI-Visa version 3.0 and above supports USB TMC. When configured to CDC, the USB port on the DMM will appear as a virtual COM port to a connected PC. Any terinal progra that can counicate via a serial port can be used for reote control. Before the DMM can be used for reote control using the CDC or TMC USB class, install the appropriate CDC or TMC USB driver included on the User Manual CD. Note *To use the TMC interface National Instruents Measureent and Autoation Explorer can be used. This progra is available on the NI website, via a search for the VISA Run-tie Engine page, or downloads at the following URL, Configure USB Interface USB Configuration PC connector DMM connector Speed USB Class Hardware flow control Data Bits 8 Stop bit 1 Type A, host Rear panel Type B, slave 1.1/2.0 (full speed/high speed) TMC (USB T&M class), CDC (Counications device class) Off 94

95 REMOTE CONTROL Steps 1. Connect the USB cable to the rear panel type B USB port. 2. Press MENU. 3. Go to I/O on level Go to USB on level Select USB-CDC or USB-TMC. Display USB class setting USB enu indicator ACDC2W4WAUTO F M SHOLDRELMINMAX nμf C M F k RMT S W Hz V W A %db S W W Hz V A ACDC 2W4WAUTOMATHLIMITERRSHIFTEXTdB 2NDCOMPSTORCLFILT SWEEPCCCVGPIBREAR C M F k Configure RS232 Interface RS232 Configuration Steps Selectable Baud rate 9600, 19200, 38400, 57600, Parity None Hardware flow control Off Data Bits 8 Stop bit 1 1. Connect the RS232 cable to the rear panel RS232 port. 95

96 GDM-8351 User Manual 2. Press MENU. 3. Go to I/O on level Go to RS232 on level 2 and press Enter. 5. The baud rate settings appear. Set the baud rate. 6. Press Enter to confir the RS232 settings. 7. Press EXIT to exit fro the Syste enu. Display Baud rate setting BAUD enu indicator 2W4WAUTO F M SHOLDRELMINMAX nμf C M F k RMT S W Hz V W A %db S W W Hz V A ACDC 2W4WAUTOMATHLIMITERRSHIFTEXTdB 2NDCOMPSTORCLFILT SWEEPCCCVGPIBREAR C M F k RS232 Pin Assignents Pin 2: RxD Pin 3: TxD Pin 5: GND Pin 1, 4, 6 ~ 9: No Connection PC Connection Use a Null Mode connection as shown in the diagra below. DMM PC Pin2 RxD Pin3 TxD Pin5 GND RxD Pin2 TxD Pin3 GND Pin5 96

97 REMOTE CONTROL Configure EOL Character Overview EOL Characters Steps The TX EOL settings set the EOL (end of line) character for return essages. The EOL characters that can be received fro a PC include CR, LF, CR+LF or LF+CR, with CR+LF being the ost coon. CR+LF, LF+CR, CR, LF 1. Press MENU. 2. Go to TX TERM on level Go to TX EOL on level Set the EOL character. 5. Press Enter to confir the EOL settings. 6. Press EXIT to exit fro the Syste enu. Display TX EOL setting TX EOL enu indicator ACDC2W4WAUTO F M SHOLDRELMINMAX nμf C M F k RMT S W Hz V W A %db S W W Hz V A ACDC 2W4WAUTOMATHLIMITERRSHIFTEXTdB 2NDCOMPSTORCLFILT SWEEPCCCVGPIBREAR C M F k 97

98 GDM-8351 User Manual Return to Local Control Background Procedure When the unit is in reote control ode, the RMT icon above the ain display can be seen. When this icon is not displayed, it indicates that the unit is in local control ode. 1. Press the LOCAL/2ND key when in reote ode. 2. The unit will go back into local ode and the RMT icon will turn off. Display Reote control indicator ACDC2W4WAUTO F M SHOLDRELMINMAX nμf C M F k RMT S W Hz V W A %db S W W Hz V A ACDC 2W4WAUTOMATHLIMITERRSHIFTEXTdB 2NDCOMPSTORCLFILT SWEEPCCCVGPIBREAR C M F k 98

99 COMMAND OVERVIEW COMMAND OVERVIEW The Coand overview chapter lists all prograing coands in functional order as well as alphabetical order. The coand syntax section shows you the basic syntax rules you have to apply when using coands. Coand Syntax Copatible Standard IEEE488.2 SCPI, 1994 Partial copatibility Partial copatibility Coand Structure SCPI (Standard Coands for Prograable Instruents) coands follow a tree-like structure, organized into nodes. Each level of the coand tree is a node. Each keyword in a SCPI coand represents each node in the coand tree. Each keyword (node) of a SCPI coand is separated by a colon (:). For exaple, the diagra below shows an SCPI sub-structure and a coand exaple. CONFigure CONFigure:VOLTage:DC :VOLTage :DC :AC :DCAC 99

100 GDM-8351 User Manual Coand Types There are a nuber of different instruent coands and queries. A coand sends instructions or data to the unit and a query receives data or status inforation fro the unit. Coand types Siple Exaple Query Exaple A single coand with/without a paraeter CONFigure:VOLTage:DC A query is a siple or copound coand followed by a question ark (?). A paraeter (data) is returned. CONFigure:RANGe? Coand Fors Coands and queries have two different fors, long and short. The coand syntax is written with the short for of the coand in capitals and the reainder (long for) in lower case. The coands can be written either in capitals or lower-case, just so long as the short or long fors are coplete. An incoplete coand will not be recognized. Below are exaples of correctly written coands. Long for CONFigure:DIODe CONFIGURE:DIODE Configure:diode 100

101 COMMAND OVERVIEW Short for CONF:DIOD conf:diod Square Brackets Coands that contain square brackets indicate that the contents are optional. The function of the coand is the sae with or without the square bracketed ites, as shown below. For exaple, for the query: [SENSe:]UNIT? Both SENSe:UNIT? and UNIT? are valid fors. Coand Forat CONFigure:VOLTage:DC Coand header 2. Space 3. Paraeter 1 Coon Input Paraeters Type Description Exaple <Boolean> boolean logic 0, 1 <NR1> integers 0, 1, 2, 3 <NR2> decial nubers 0.1, 3.14, 8.5 <NR3> floating point with exponent 4.5e-1, 8.25e+1 <NRf> any of NR1, 2, 3 1, 1.5, 4.5e-1 [MIN] (Optional paraeter) For coands, this will set the setting to the lowest value. This paraeter can be used in place of any nuerical paraeter where indicated. For queries, it will return the lowest possible value allowed for the particular setting. 101

102 GDM-8351 User Manual [MAX] (Optional paraeter) For coands, this will set the setting to the highest value. This paraeter can be used in place of any nuerical paraeter where indicated. For queries, it will return the highest possible value allowed for the particular setting. Autoatic paraeter range selection The GDM-8351 autoatically sets the coand paraeter to the next available value. Exaple conf:volt:dc 2 This will set the easureent ite to DC Voltage and the range to 10V. There is no 2V range so the DMM selects the next available range, 10V. Message Terinator (EOL) Reote Coand Marks the end of a coand line. The following essages are in accordance with IEEE488.2 standard. LF, CR, CR+LF, LF+CR The ost coon EOL character is CR+LF Message Separator EOL or ; (seicolon) Coand Separator 102

103 COMMAND OVERVIEW Coand List Configure Coands (Display 1) CONFigure:VOLTage:DC CONFigure:VOLTage:AC CONFigure:VOLTage:DCAC CONFigure:CURRent:DC CONFigure:CURRent:AC CONFigure:CURRent:DCAC CONFigure:RESistance CONFigure:FRESistance CONFigure:FREQuency CONFigure:PERiod CONFigure:CONTinuity CONFigure:DIODe CONFigure:TEMPerature:TCOuple CONFigure:CAPacitance CONFigure:FUNCtion? CONFigure:RANGe? CONFigure:AUTO CONFigure:AUTO? Configure Coands (Display 2) CONFigure2:VOLTage:DC CONFigure2:VOLTage:AC CONFigure2:CURRent:DC CONFigure2:CURRent:AC CONFigure2:RESistance CONFigure2:FRESistance CONFigure2:FREQuency CONFigure2:PERiod CONFigure2:OFF CONFigure2:FUNCtion? CONFigure2:RANGe? CONFigure2:AUTO CONFigure2:AUTO?

104 Measure Coands GDM-8351 User Manual MEASure:VOLTage:DC? MEASure:VOLTage:AC? MEASure:VOLTage:DCAC? MEASure:CURRent:DC? MEASure:CURRent:AC? MEASure:CURRent:DCAC? MEASure:RESistance? MEASure:FRESistance? MEASure:FREQuency? MEASure:PERiod? MEASure:CONTinuity? MEASure:DIODe? MEASure:CAPacitance? MEASure:TEMPerature:TCOuple? MEASure2:VOLTage:DC? MEASure2:VOLTage:AC? MEASure2:CURRent:DC? MEASure2:CURRent:AC? MEASure2:RESistance? MEASure2:FRESistance? MEASure2:FREQuency? MEASure2:PERiod? Sense Coands [SENSe:]TEMPerature:TCOuple:TYPE [SENSe:]TEMPerature:TCOuple:TYPE? [SENSe:]TEMPerature:RJUNction:SIMulated [SENSe:]TEMPerature:RJUNction:SIMulated? [SENSe:]DETector:RATE [SENSe:]DETector:RATE? [SENSe:]AVERage:TCONtrol [SENSe:]AVERage:TCONtrol? [SENSe:]AVERage:COUNt [SENSe:]AVERage:COUNt? [SENSe:]AVERage:WINDow [SENSe:]AVERage:WINDow? [SENSe:]AVERage:STATe [SENSe:]AVERage:STATe? [SENSe:]FREQuency:INPutjack

105 COMMAND OVERVIEW [SENSe:]FREQuency:INPutjack? [SENSe:]PERiod:INPutjack [SENSe:]PERiod:INPutjack? [SENSe:]CONTinuity:THReshold [SENSe:]CONTinuity:THReshold? [SENSe:]UNIT [SENSe:]UNIT? [SENSe:]FUNCtion[1/2] [SENSe:]FUNCtion[1/2]? Calculate Coands CALCulate:FUNCtion CALCulate:FUNCtion? CALCulate:STATe CALCulate:STATe? CALCulate:MINiu? CALCulate:MAXiu? CALCulate:HOLD:REFerence CALCulate:HOLD:REFerence? CALCulate:REL:REFerence CALCulate:REL:REFerence? CALCulate:LIMit:LOWer CALCulate:LIMit:LOWer? CALCulate:LIMit:UPPer CALCulate:LIMit:UPPer? CALCulate:DB:REFerence CALCulate:DB:REFerence? CALCulate:DBM:REFerence CALCulate:DBM:REFerence? CALCulate:MATH:MMFactor CALCulate:MATH:MMFactor? CALCulate:MATH:MBFactor CALCulate:MATH:MBFactor? CALCulate:MATH:PERCent CALCulate:MATH:PERCent? Trigger Coands READ? VAL1? VAL2?

106 GDM-8351 User Manual TRIGger:SOURce TRIGger:SOURce? TRIGger:AUTO TRIGger:AUTO? SAMPle:COUNt SAMPle:COUNt? TRIGger:COUNt TRIGger:COUNt? Syste Coands Status Coands SYSTe:BEEPer:STATe SYSTe:BEEPer:STATe? SYSTe:BEEPer:ERRor SYSTe:BEEPer:ERRor? SYSTe:BEEPer SYSTe:ERRor? SYSTe:VERSion? SYSTe:DISPlay SYSTe:DISPlay? SYSTe:SERial? INPut:IMPedance:AUTO INPut:IMPedance:AUTO? DISPlay:TEXT DISPlay:TEXT? DISPlay:TEXT:CLEar DIGitalio:MODE DIGitalio:MODE? DIGitalio[ ]:SETup DIGitalio[ ]:SETup? STATus:QUEStionable:ENABle STATus:QUEStionable:ENABle? STATus:QUEStionable:EVENt? STATus:PRESet Interface Coands SYSTe:LOCal SYSTe:REMote SYSTe:RWLock

107 COMMAND OVERVIEW Coon Coands *CLS *ESE? *ESE *ESR? *IDN? *OPC? *OPC *PSC? *PSC *RST *SRE? *SRE *STB? *TRG

108 GDM-8351 User Manual CONFigure Coands CONFigure:VOLTage:DC Sets easureent to DC Voltage on the first display and specifies the range. Paraeter: [None] [Range(<NRf> MIN MAX DEF)] Exaple: CONF:VOLT:DC 1 Sets the voltage range to 1 volt. CONFigure:VOLTage:AC Sets easureent to AC Voltage on the first display and specifies the range. Paraeter: [None] [Range(<NRf> MIN MAX DEF)] Exaple: CONF:VOLT:AC Sets the AC range to auto range. CONFigure:VOLTage:DCAC Sets easureent to DC+AC Voltage on the first display and specifies the range. Paraeter: [None] [Range(<NRf> MIN MAX DEF)] Exaple: CONF:VOLT:DCAC Sets the DC+AC voltage range to auto range. CONFigure:CURRent:DC Sets easureent to DC Current on the first display and specifies the range. Paraeter: [None] [Range(<NRf> MIN MAX DEF)] Exaple: CONF:CURR:DC 10e-3 Sets the DC current range to 10A. 108

109 COMMAND OVERVIEW CONFigure:CURRent:AC Sets easureent to AC Current on the first display and specifies the range. Paraeter: [None] [Range(<NRf> MIN MAX DEF)] Exaple: CONF:CURR:AC 10e-2 Sets the easureent ode to ACI with a 100A range. CONFigure:CURRent:DCAC Sets easureent to DC+AC Current on the first display and specifies the range. Paraeter: [None] [Range(<NRf> MIN MAX DEF)] Exaple: CONF:CURR:DCAC 10e-2 Sets the easureent ode to DC+AC Current with a 100A range. CONFigure:RESistance Sets easureent to 2W Resistance on the first display and specifies range. Paraeter: [None] [Range(<NRf> MIN MAX DEF)] Exaple: CONF:RES 10e3 Sets the range to 10kΩ. CONFigure:FRESistance Sets easureent to 4W Resistance on the first display and specifies range. Paraeter: [None] [Range(<NRf> MIN MAX DEF)] Exaple: CONF:FRES 10e3 Sets the range to 10kΩ. 109

110 GDM-8351 User Manual CONFigure:FREQuency Sets easureent to Frequency on the first display and specifies the range. Paraeter: [None] [Range(<NRf> MIN MAX DEF)] Exaple: CONF:FREQ MAX Sets the frequency easureent range to ax. CONFigure:PERiod Sets easureent to Period on the first display and specifies the range. Paraeter: [None] [Range(<NRf> MIN MAX DEF)] Exaple: CONF:PER Sets the DMM to period easureent using the autorange. CONFigure:CONTinuity Sets easureent to Continuity on the first display. Paraeter: None CONFigure:DIODe Sets easureent to Diode on the first display. Paraeter: None CONFigure:TEMPerature:TCOuple Sets easureent to Teperature therocouple on the first display. Paraeter: [None] [Type(J K T)] Exaple: CONF:TEMP:TCO J Sets the easureent ode to TCO with a type J sensor. 110

111 COMMAND OVERVIEW CONFigure:CAPacitance Sets easureent to Capacitance on the first display. Paraeter: [None] [Range(<NRf> MIN MAX DEF)] Exaple: CONF:CAP 10E-6 Sets the easureent ode to Capacitance with a 10μF Range. CONFigure:FUNCtion? Returns the current function on the first display. Return paraeter: VOLT, VOLT:AC,VOLT:DCAC, CURR, CURR:AC,CURR:DCAC, RES, FRES, FREQ, PER, TEMP, DIOD, CONT, CAP CONFigure:RANGe? Returns the current range on the first display. Return Paraeter: DCV: 0.1(100V), 1(1V), 10(10V), 100(100V), 1000(1000V) ACV: 0.1(100V), 1(1V), 10(10V), 100(100V), 750(750V) ACI: 0.01(10A), 0.1(100A), 1(1A), 10(10A) DCI: 0.01(10A), 0.1(100A), 1(1A), 10(10A) RES: 10E+1(100Ω) 10E+2(1kΩ), 10E+3(10kΩ), 10E+4 (100kΩ), 10E+5(1MΩ), 10E+6(10MΩ), 10E+7(100MΩ) FRES: 10E+1(100Ω) 10E+2(1kΩ), 10E+3(10kΩ), 10E+4 (100kΩ), 10E+5(1MΩ), 10E+6(10MΩ), 10E+7(100MΩ) CAP: 10E-9(10nF), 10E-8(100nF), 10E-7(1μF), 10E-6(10μF), 10E-5(100μF) CONFigure:AUTO Sets Auto-Range on or off on the first display. Paraeter: ON OFF Exaple: CONF:AUTO ON CONFigure:AUTO? Returns the Auto-Range status of the function on the 1 st display. Return Paraeter: 0 1, 1=Auto range, 0=Manual range 111

112 GDM-8351 User Manual Secondary Display: CONFigure2 Coands CONFigure2:VOLTage:DC Sets easureent to DC Voltage on the second display and specifies the range. Paraeter: [None] [Range(<NRf> MIN MAX DEF)] Exaple: CONF2:VOLT:DC 1 Sets the voltage range to 1 volts. CONFigure2:VOLTage:AC Sets easureent to AC Voltage on the second display and specifies the range. Paraeter: [None] [Range(<NRf> MIN MAX DEF)] Exaple: CONF2:VOLT:AC Sets the easureent ode to AC voltage. CONFigure2:CURRent:DC Sets easureent to DC Current on the second display and specifies the range. Paraeter: [None] [Range(<NRf> MIN MAX DEF)] Exaple: CONF2:CURR:DC 10e-3 Sets the DC current range to 10A on the second display. CONFigure2:CURRent:AC Sets easureent to AC Current on the second display and specifies the range. Paraeter: [None] [Range(<NRf> MIN MAX DEF)] Exaple: CONF2:CURR:AC 10e-2 Sets the easureent ode to ACI with a 100A range on the second display. 112

113 COMMAND OVERVIEW CONFigure2:RESistance Sets easureent to 2W Resistance on the second display and specifies the range. Paraeter: [None] [Range(<NRf> MIN MAX DEF)] Exaple: CONF2:RES 10e3 Sets the range to 10kΩ on the second display. CONFigure2:FRESistance Sets easureent to 4W Resistance on the second display and specifies the range. Paraeter: [None] [Range(<NRf> MIN MAX DEF)] Exaple: CONF2:FRES 10e3 Sets the range to 10kΩ on the second display. CONFigure2:FREQuency Sets easureent to Frequency on the second display and specifies the range. Paraeter: [None] [Range(<NRf> MIN MAX DEF)] Exaple: CONF2:FREQ MAX Sets the frequency easureent range to ax on the second display. CONFigure2:PERiod Sets easureent to Period on the second display and specifies the range. Paraeter: [None] [Range(<NRf> MIN MAX DEF)] Exaple: CONF2:PER Sets the DMM to period easureent using the previous range on the second display. CONFigure2:OFF Turns the second display function off. Paraeter: None. 113

114 GDM-8351 User Manual CONFigure2:FUNCtion? Returns the current function on the second display. Return paraeter: VOLT, VOLT:AC, CURR, CURR:AC, RES, FRES, FREQ, PER, NON CONFigure2:RANGe? Returns the range of the current function on the second display. Return paraeter: DCV: 0.1(100V), 1(1V), 10(10V), 100(100V), 1000(1000V) ACV: 0.1(100V), 1(1V), 10(10V), 100(100V), 750(750V) ACI: 0.01(10A), 0.1(100A), 1(1A), 10(10A) DCI: 0.01(10A), 0.1(100A), 1(1A), 10(10A) RES: 10E+1(100Ω) 10E+2(1kΩ), 10E+3(10kΩ), 10E+4 (100kΩ), 10E+5(1MΩ), 10E+6(10MΩ), 10E+7(100MΩ) FRES: 10E+1(100Ω) 10E+2(1kΩ), 10E+3(10kΩ), 10E+4 (100kΩ), 10E+5(1MΩ), 10E+6(10MΩ), 10E+7(100MΩ) CONFigure2:AUTO Sets Auto-Range on or off on the 2nd display. Paraeter: ON OFF Exaple: CONF2:AUTO ON CONFigure2:AUTO? Returns the Auto-Range status of the function on the 2nd display. Return Paraeter: 0 1, 1=Auto range, 0=Manual range 114

115 COMMAND OVERVIEW Measure Coands MEASure:VOLTage:DC? Returns the DC voltage easureent on the first display. Paraeter: [None] [Range(<NRf> MIN MAX DEF)] Exaple: MEAS:VOLT:DC? > E-01 Returns the DC voltage easureent as V. MEASure:VOLTage:AC? Returns the AC voltage easureent on the first display. Paraeter: [None] [Range(<NRf> MIN MAX DEF)] Exaple: MEAS:VOLT:AC? > E-01 Returns the AC voltage easureent as V. MEASure:VOLTage:DCAC? Returns the DC+AC voltage easureent on the first display. Paraeter: [None] [Range(<NRf> MIN MAX DEF)] Exaple: MEAS:VOLT:DCAC? > E-01 Returns the DC+AC voltage easureent as V. MEASure:CURRent:DC? Returns the DC current easureent on the first display. Paraeter: [None] [Range(<NRf> MIN MAX DEF)] Exaple: MEAS:CURR:DC? > E-02 Returns the DC current easureent as A. 115

116 GDM-8351 User Manual MEASure:CURRent:AC? Returns the AC current easureent on the first display. Paraeter: [None] [Range(<NRf> MIN MAX DEF)] Exaple: MEAS:CURR:AC? > E-02 Returns the AC current easureent as A. MEASure:CURRent:DCAC? Returns the DC+AC current easureent on the first display. Paraeter: [None] [Range(<NRf> MIN MAX DEF)] Exaple: MEAS:CURR:DCAC? > E-02 Returns the DC+AC current easureent as A. MEASure:RESistance? Returns the 2W resistance easureent on the first display. Paraeter: [None] [Range(<NRf> MIN MAX DEF)] Exaple: MEAS:RES? > E+03 Returns the 2W easureent as kΩ. MEASure:FRESistance? Returns the 4W resistance easureent on the first display. Paraeter: [None] [Range(<NRf> MIN MAX DEF)] Exaple: MEAS:FRES? > E+03 Returns the 4W easureent as kΩ. MEASure:FREQuency? Returns the frequency easureent on the first display. Paraeter: [None] [Range(<NRf> MIN MAX DEF)] Exaple: MEAS:FREQ? > E+03 Returns the frequency ( kHz). 116

117 COMMAND OVERVIEW MEASure:PERiod? Returns the period easureent on the first display. Paraeter: [None] [Range(<NRf> MIN MAX DEF)] Exaple: MEAS:PER? MAX Returns the period at the axiu range. MEASure:CONTinuity? Returns the continuity easureent on the first display. Exaple: MEAS:CONT? Returns the continuity. MEASure:DIODe? Returns the diode easureent on the first display. Exaple: MEAS:DIOD? Returns the diode easureent. MEASure:CAPacitance? Returns the capacitance easureent on the first display. Exaple: MEAS:CAP? Returns the capacitance easureent. MEASure:TEMPerature:TCOuple? Returns the teperature for the selected therocouple type on the first display. Paraeter:[NONE] J K T Exaple: MEAS:TEMP:TCO? J > E+03 Returns the teperature easureent. 117

118 GDM-8351 User Manual MEASure2:VOLTage:DC? Returns the DC voltage easureent on the second display. Paraeter: [None] [Range(<NRf> MIN MAX DEF)] Exaple: MEAS2:VOLT:DC? > E-01 Returns the DC voltage easureent as V. MEASure2:VOLTage:AC? Returns the AC voltage easureent on the second display. Paraeter: [None] [Range(<NRf> MIN MAX DEF)] Exaple: MEAS2:VOLT:AC? > E-01 Returns the AC voltage easureent as V. MEASure2:CURRent:DC? Returns the DC current easureent on the second display. Paraeter: [None] [Range(<NRf> MIN MAX DEF)] Exaple: MEAS2:CURR:DC? > E-02 Returns the DC current easureent as A. MEASure2:CURRent:AC? Returns the AC current easureent on the second display. Paraeter: [None] [Range(<NRf> MIN MAX DEF)] Exaple: MEAS2:CURR:AC? > E-02 Returns the AC current easureent as A. MEASure2:RESistance? Returns the 2W resistance easureent on the second display. Paraeter: [None] [Range(<NRf> MIN MAX DEF)] Exaple: MEAS2:RES? > E+03 Returns the 2W easureent. 118

119 COMMAND OVERVIEW MEASure2:FRESistance? Returns the 4W resistance easureent on the second display. Paraeter: [None] [Range(<NRf> MIN MAX DEF)] Exaple: MEAS2:FRES? > E+03 Returns the 4W easureent. MEASure2:FREQuency? Returns the frequency easureent on the second display. Paraeter: [None] [Range(<NRf> MIN MAX DEF)] Exaple: MEAS2:FREQ? > E+03 Returns the frequency ( kHz). MEASure2:PERiod? Returns the period easureent on the second display. Paraeter: [None] [Range(<NRf> MIN MAX DEF)] Exaple: MEAS2:PER? MAX Returns the period at the axiu range. SENSe Coands [SENSe:]TEMPerature:TCOuple:TYPE Sets therocouple type. Paraeter: Type(J K T) Exaple: SENS:TEMP:TCO:TYPE J Sets the therocouple to type J. [SENSe:]TEMPerature:TCOuple:TYPE? Returns the therocouple type. Return paraeter: J, K, T 119

120 GDM-8351 User Manual [SENSe:]TEMPerature:RJUNction:SIMulated Set teperature siulation value. Paraeter: <NRf>(0.00 ~ 50.00) Exaple: SENS:TEMP:RJUN:SIM Sets the therocouple junction teperature to 25 C. [SENSe:]TEMPerature:RJUNction:SIMulated? Returns teperature siulation value. Return paraeter: <NR1> (+0000~+5000),where +0000=0.00 C, +5000=50.00 C [SENSe:]DETector:RATE Sets the detection rate (saple rate) Paraeter: RATE(S M F) Exaple: SENS:DET:RATE S Sets the rate to slow (S). [SENSe:]DETector:RATE? Returns the saple rate. Return paraeter: SLOW, MID, FAST [SENSe:]AVERage:TCONtrol Selects the digital filter. Paraeter: MOV REP Exaple: SENS:AVER:TCON MOV Sets the digital filter to the oving filter. [SENSe:]AVERage:TCONtrol? Returns the current digital filter type. Return paraeter: MOV(oving), REP(repeating) 120

121 COMMAND OVERVIEW [SENSe:]AVERage:COUNt Sets the digital filter average count. Paraeter: <NR1> (2~320) MIN MAX Exaple: SENS:AVER:COUN 100 Sets the digital filter average count to 100. [SENSe:]AVERage:COUNt? Returns the current digital filter average count. Return paraeter: <NR1>(+002 ~ +320) [SENSe:]AVERage:WINDow Sets the digital filter window. Paraeter: (none) Exaple: SENS:AVER:WIND 0.1 Sets the digital filter window to 0.1%. [SENSe:]AVERage:WINDow? Returns the current digital filter window value. Return paraeter: 0.01, 0.1, 1, 10, NONE [SENSe:]AVERage:STATe Turns the digital filter on or off. Paraeter: ON OFF Exaple: SENS:AVER:STAT ON Turns the digital filter on. [SENSe:]AVERage:STATe? Returns the state of the digital filter (on or off). Return paraeter: 0 1, 0=OFF, 1=ON 121

122 GDM-8351 User Manual [SENSe:]FREQuency:INPutjack Assigns an input terinal for the frequency function. Paraeter: (0 1 2) 0=volt, 1=1A, 2=10A Exaple: SENS:FREQ:INP 0 Sets the input jack to the Volt input terinal. [SENSe:]FREQuency:INPutjack? Returns the assigned input terinal used for the frequency function. Return Paraeter: VOLT, 1A, 10A [SENSe:]PERiod:INPutjack Assigns an input terinal for the period function. Paraeter: (0 1 2) 0=volt, 1=1A, 2=10A Exaple: SENS:PER:INP 0 Sets the input jack to the Volt input terinal. [SENSe:]PERiod:INPutjack? Returns the assigned input terinal used for the period function. Return Paraeter: VOLT, 1A, 10A [SENSe:]CONTinuity:THReshold Sets the continuity threshold in ohs. Paraeter: <NRf> (0 ~ 1000) Exaple: SENS:CONT:THR 500 Sets the continuity threshold to 500 ohs. [SENSe:]CONTinuity:THReshold? Returns the continuity threshold. Return Paraeter: <NR1> (0~1000) 122

123 COMMAND OVERVIEW [SENSe:]UNIT Sets the teperature unit. Paraeter: C F Exaple: SENS:UNIT C Sets the teperature unit to C. [SENSe:]UNIT? Returns the teperature unit. [SENSe:]FUNCtion[1/2] Sets the function for the first or second display. Paraeter: (display1):"volt[:dc]", "VOLT:AC", VOLT:DCAC, "CURR[:DC]", "CURR:AC", CURR:DCAC, "RES", FRES, "FREQ", "PER", "TEMP:TCO", "DIOD", "CONT", CAP (display2): "VOLT[:DC]", "VOLT:AC", "CURR[:DC]", "CURR:AC", "RES", FRES, "FREQ", "PER", "NON" Exaple: SENS:FUNC1 "VOLT:DC" Sets the 1 st display to the DCV function. [SENSe:]FUNCtion[1/2]? Returns the function displayed on the first or second display. Return paraeter: (display 1): VOLT, VOLT:AC,VOLT:DCAC, CURR, CURR:AC,CURR:DCAC, RES, FRES, FREQ, PER, TEMP:TCO, DIOD, CONT, CAP (display 2): VOLT, VOLT:AC, CURR, CURR:AC, RES, FRES, FREQ, PER, NON 123

124 GDM-8351 User Manual CALCulate Coands CALCulate:FUNCtion Sets the Advanced function. Paraeter: OFF MIN MAX HOLD REL COMP DB DBM MXB INV REF Exaple: CALC:FUNC REL Sets the Advanced function to REL (relative) CALCulate:FUNCtion? Returns the current Advanced function. CALCulate:STATe Turns the Advanced function on/off. Paraeter: ON OFF Exaple: CALC:STAT OFF Turns the Advanced function off. CALCulate:STATe? Returns the status of the Advanced function. Return Paraeter: 0 1, 1=ON, 0=OFF CALCulate:MINiu? Returns the iniu value fro the Max/Min easureent. CALCulate:MAXiu? Returns the axiu value fro the Max/Min easureent. 124

125 COMMAND OVERVIEW CALCulate:HOLD:REFerence Sets the percentage threshold for the Hold function. Paraeter: <NRf> (0.01, 0.1, 1, 10) Exaple: CALC:HOLD:REF 10 Sets the hold percentage to 10%. CALCulate:HOLD:REFerence? Returns the percentage threshold fro the Hold function. CALCulate:REL:REFerence Sets the reference value for the relative function. Paraeter: <NRf> MIN MAX Exaple: CALC:REL:REF MAX Sets the reference value to the axiu allowed. CALCulate:REL:REFerence? Returns the reference value fro the relative function. CALCulate:LIMit:LOWer Sets the lower liit of the copare function. Paraeter: <NRf> MIN MAX Exaple: CALC:LIM:LOW 1.0 Sets the lower liit to 1.0 CALCulate:LIMit:LOWer? Returns the lower liit of the copare function. CALCulate:LIMit:UPPer Sets the upper liit of the copare function. Paraeter: <NRf> MIN MAX Exaple: CALC:LIM:UPP 1.0 Sets the upper liit to

126 GDM-8351 User Manual CALCulate:LIMit:UPPer? Returns the upper liit of the copare function. CALCulate:DB:REFerence Sets the reference value for the db function. Paraeter: <NRf> MIN MAX Exaple: CALC:DB:REF MAX Sets the reference voltage for db easureents to the axiu allowed. CALCulate:DB:REFerence? Returns the reference voltage fro the db function. CALCulate:DBM:REFerence Sets the resistance value for the db function. Paraeter: <NRf> MIN MAX Exaple: CALC:DBM:REF MAX Sets the resistance value for db easureents to the axiu allowed. CALCulate:DBM:REFerence? Returns the resistance value fro the db function. CALCulate:MATH:MMFactor Sets the scale factor M for ath easureents. Paraeter: <NRf> MIN MAX Exaple: CALC:MATH:MMF MIN Sets the scale factor M to the iniu allowed value. CALCulate:MATH:MMFactor? Returns the scale factor M used in the ath easureent. 126

127 COMMAND OVERVIEW CALCulate:MATH:MBFactor Sets the offset factor B for ath easureents. Paraeter: <NRf> MIN MAX Exaple: CALC:MATH:MBF MIN Sets the offset factor B to the iniu allowed value. CALCulate:MATH:MBFactor? Returns the offset factor B used in the ath easureent. CALCulate:MATH:PERCent Sets the reference value for the Percent function. Paraeter: <NRf> MIN MAX Exaple: CALC:MATH:PERC MAX Sets the reference value for the Percent function to the axiu. CALCulate:MATH:PERCent? Returns the reference value setting for the Percent function. 127

128 GDM-8351 User Manual TRIGger Coands READ? Returns 1 st and 2 nd display value. Exaple1: SAMP:COUN 4(USBTMC) READ?(count = SAMP:COUN/2, rounded up) > E-01, E+00, E-01, E+00 Queries 2 counts of easureent saples fro the first and second display. Exaple2: SAMP:COUN 3(USBCDC or RS232) READ?(Count = 3) > E-01, E+00, E-01, E+00, E-01, E+00 Queries 3 counts of easureent saples fro the first and second display. VAL1? Returns the 1 st display reading Exaple: SAMP:COUN 3 (all reote interfaces) VAL1? > E-01, E-01, E-01 Queries 3 counts of easureent saples fro the 1 st display. VAL2? Returns the 2 nd display reading. Exaple: SAMP:COUN 3 (all reote interfaces) VAL2? > E-01, E-01, E-01 Queries 3 counts of easureent saples fro the 2 nd display. 128

129 COMMAND OVERVIEW TRIGger:SOURce Selects the trigger source. Paraeter: INT EXT Exaple: TRIG:SOUR INT Sets the trigger source as internal. TRIGger:SOURce? Returns current trigger source. TRIGger:AUTO Turns Trigger Auto ode on/off. Paraeters: ON OFF Exaple: TRIG:AUTO OFF Turns the Trigger Auto ode off. TRIGger:AUTO? Returns the Trigger Auto ode. Return paraeter: 0 1, 0=OFF, 1=ON SAMPle:COUNt Sets the nuber of saples. Paraeter: <NR1>(CDC:1 ~ 9999 TMC:1 ~ 320) MIN MAX Exaple: SAMP:COUN 10 Sets the nuber of saples to 10. SAMPle:COUNt? Returns the nuber of saples. Paraeter: None MIN MAX 129

130 GDM-8351 User Manual TRIGger:COUNt Sets the nuber of trigger counts. Paraeter: <NR1>(1 ~ 9999) MIN MAX Exaple: TRIG:COUN 10 Sets the nuber of trigger counts to 10. TRIGger:COUNt? Returns the nuber of trigger counts. Paraeter: None MIN MAX 130

131 COMMAND OVERVIEW SYSTe Related Coands SYSTe:BEEPer:STATe Selects the beeper ode; no beep, beep on fail and beep on pass. Paraeter: <NR1>(0 1 2) 0=no beep, 2=fail, 1=pass Exaple: SYST:BEEP:STAT 0 Turns the beeper off. SYSTe:BEEPer:STATe? Returns the beeper ode. Return paraeter: Beep on Pass Beep on Fail No Beep SYSTe:BEEPer:ERRor Sets the beeper to sound on an SCPI error. Paraeter: ON OFF Exaple: SYST:BEEP:ERR ON Allows the beeper to sound when an SCPI error occurs. SYSTe:BEEPer:ERRor? Returns the beeper error ode. Return paraeter: 0 1, 0=OFF, 1=ON SYSTe:BEEPer Issues a single beep. Paraeter: NONE SYSTe:ERRor? Returns the current syste error, if any. SYSTe:VERSion? Returns syste version. Return Paraeter: X.XX. 131

132 GDM-8351 User Manual SYSTe:DISPlay Turns the Display on/off. Paraeter: ON OFF Exaple: SYST:DISP ON Turns the display on. SYSTe:DISPlay? Returns the status of the display Return paraeter: 0 1, 0=OFF, 1=ON SYSTe:SERial? Returns the serial nuber (nine characters/nubers) INPut:IMPedance:AUTO Sets the input ipedance for DCV ode (100V range and 1V range). Paraeter: ON(10G) OFF(10M) Exaple: INP:IMP:AUTO ON Turns the Autoatic input ipedance on. INPut:IMPedance:AUTO? Returns the input ipedance ode. Return paraeter: <Boolean>(0 1) (0=OFF(10M), 1=ON(10G)) DISPlay:TEXT Write a essage to the display. Paraeter: Text can contain alphanueric characters including spaces, +, -, /, up to 13 characters. Exaple: DISP:TEXT DMM TEST Write DMM TEST to the display. DISPlay:TEXT? Returns the displayed essage. 132

133 COMMAND OVERVIEW DISPlay:TEXT:CLEar Clear essage fro display. Paraeter:NONE Exaple: DISP:TEXT:CLE DIGitalio:MODE Sets the ode for Digital I/O. Paraeter: NORM USER Exaple: DIG:MODE NORM Sets the Digital I/O Mode to noral. DIGitalio:MODE? Returns the Digital I/O ode. Return paraeter: NORM USER DIGitalio[ ]:SETup Sets the status for Digital I/O(only for user ode). Paraeter: ON OFF Exaple: DIG1:SET ON DIGitalio[ ]:SETup? Returns the Digital I/O status (only for User ode). Return paraeter: 0 1, 0=OFF, 1=ON 133

134 GDM-8351 User Manual STATus Report Coands STATus:QUEStionable:ENABle Set bits in the Questionable Data Enable register. STATus:QUEStionable:ENABle? Returns the contents of the Questionable Data Enable register. STATus:QUEStionable:EVENt? Returns the contents of the Questionable Data Event register. STATus:PRESet Clears the Questionable Data Enable register. Exaple: STAT:PRES Interface Coands SYSTe:LOCal Enables local control (front panel control) and disables reote control. SYSTe:REMote Enables reote control and disables local control (front panel control). Local control can be recalled by pressing the 2ND or local button. 134

135 COMMAND OVERVIEW SYSTe:RWLock Enables reote control and disables local control (front panel control). Once this coand has been issued, pressing the 2ND or local buttons will not return the user to local control. The only way to return to local ode is to issue the SYSTe:LOCal coand. IEEE Coon Coands *CLS Clears the Event Status register (Output Queue, Operation Event Status, Questionable Event Status, Standard Event Status) *ESE? Returns the ESER (Event Status Enable Register) contents. Exaple: *ESE? >130 Returns 130. ESER= *ESE Sets the ESER contents. Paraeter: <NR1> (0~255) Exaple: *ESE 65 Sets the ESER to *ESR? Returns SESR (Standard Event Status Register) contents. Exaple: *ESR? >198 Returns 198. SESR=

136 GDM-8351 User Manual *IDN? Returns the anufacturer, odel No., serial nuber and syste version nuber. Exaple: *IDN? >GWInstek,GDM8351, ,1.0 *OPC? 1 is placed in the output queue when all the pending operations are copleted. *OPC Sets the operation coplete bit (bit0) in SERS (Standard Event Status Register) when all pending operations are copleted. *PSC? Returns power On clear status. Return paraeter: <Boolean>(0 1) 0= don t clear, 1=clear *PSC Clears power On status. Paraeter: <Boolean>(0 1) 0=don t clear, 1= clear *RST Recalls default panel setup. *SRE? Returns the SRER (Service Request Enable Register) contents. *SRE Sets SRER contents. Paraeter: <NR1>(0~255) Exaple: *SRE 7 Sets the SRER to

137 COMMAND OVERVIEW *STB? Returns the SBR (Status Byte Register) contents. Exaple:*STB? >64 Returns the contents of the SBR as *TRG Manually triggers the DMM. For the following coand sets, please refer to the status syste diagra on page 144. STAT: QUES:EVEN? STAT: QUES: ENAB STAT: QUES: ENAB? *ESR? *ESE *ESE? *STB? *SRE *SRE? 137

138 GDM-8351 User Manual FAQ The DMM perforance doesn t atch the specifications. Make sure the device is powered On for at least 30 inutes, within 18~28 C. This is necessary to stabilize the unit to atch the specifications. The easured voltage does not atch the expected value. There are a nuber of reasons why the easured value ay not atch the expected values. 1. Ensure that all connections are connected securely and have a good contact at all ties. Poor contacts could result in erroneous easureents. 2. Ensure that the appropriate input resistance has been set in the Syste enu. For 100v and 1V ranges, the input resistance can be set to either 10MΩ or 10GΩ. 3. When easuring AC voltage or current, the RMS of the voltage peak is easured, not the voltage peak. See page 35 for details. 4. The easureent rate settings can have an effect on the accuracy of the easureent. Slow easureents are ore accurate, while the fast rate is not as accurate. 5. Ensure that an appropriate range setting is used. If a too-large range is used, the resolution or the easureent ay be affected. For ore inforation, contact your local dealer or GWInstek at / arketing@goodwill.co.tw. 138

139 APPENDIX APPENDIX Syste Menu Tree LEVEL 1 SYSTEM MEAS TEMP I/O TX TERM FW LEVEL 2 TX EOL LEVEL 2 VER Vx.xx UPDATE NO YES LEVEL 2 USB RS232 CR+LF LF CR LF+CR LEVEL 2 SENSOR SIM USB-CDC USB-TMC UNIT TYPE J TYPE K TYPE T C F LEVEL 2 CONT INJACK INPUT R TRIG 0010 VOLT 1A 10A 10M 10G INT EXT LEVEL 2 BEEP LIGHT SN FACTORY PASS OFF FAIL LIGHT: LIGHT:2 LIGHT:3 LIGHT:4 LIGHT:5 NO YES 139

140 GDM-8351 User Manual Factory Default Settings Measureent Ite Range Rate SYSTEM Menu MEAS Menu TEMP Menu I/O Menu TX Ter FW DCV AUTO S BEEP: Pass LIGHT: 3 S/N: N/A FACTORY: NO CONT: 0010Ω INJACK: VOLT INPUT R: 10M SENSOR: TYPE J SIM: UNIT: C USB: USB-CDC EOL:CR+LF N/A 140

141 APPENDIX Replacing the AC Source Fuse Fuse Ratings Type Rating Size 0.125AT 100VAC, 120VAC 5 X AT 220VAC, 240VAC 5 X 20 Steps Note Only replace the fuse with a fuse of the correct type and rating. 1. Turn the DMM off and take out the power cord. 2. Reove the fuse socket using a flathead screwdriver. 3. Reove the fuse in the holder and replace with the correct type and rating. 4. Ensure the correct line voltage is lined up with the arrow on the fuse holder. Insert the fuse socket. 141