INSTRUCTION MANUAL Model 403380 Autoranging DMM ProbeMeter TM Measures voltage, resistance, frequency, capacitance, temperature, and duty cycle. Back lit LCD with Autorange and full function displays Audible continuity and diode tests 1. INTRODUCTION Congratulations on your purchase of Extech s Autoranging DMM Probemeter TM. This professional meter, with proper care, will provide years of safe reliable service. 1 403380 Ver. 1.01 7/99
2. SPECIFICATIONS 2.1 General Specifications Display Polarity Overrange Low battery indication Measurement rate Operating conditions Storage Temperature Accuracy Auto Power off Safety Power Battery life Dimensions Weight 2500 count backlit LCD Automatic, positive implied, negative polarity indication "OL" or "-OL" is displayed The low battery icon is displayed when the battery voltage drops below the operating level 2.5 times per second, nominal 32 o F to 104 o F (0 to 40 o C) at <70% relative humidity -4 o F to 140 o F (-20 to 60 o C), 0 to 80% R.H. Stated accuracy at 73.4 o F ±9 o F, <75% relative humidity After 30 minute period of non-use EN61010-1 protection class II over-voltage category (CAT II 600V) pollution degree 2 4 x 1.5V (AAA size) batteries 500 hours typical with alkaline 6.7 (H) x 1.7 (W) x 1.6 (D) (170mm x 44mm x 40mm) 4.5 oz. (140g) including batteries. 2.2 Function Specifications Function Range Resolution Accuracy DC Volts 250mV 100uV ±(0.25% rdg + 5dgts) 2.5V 1mV ±(0.25% rdg + 1dgt) Input impedance: 10MΩ 25V 10mV 250V 0.1V 600VAC/DC 600V 1V AC Volts (50-500Hz) 250mV 100uV not specified Input impedance: 10MΩ 2.5V 1mV ±(0.75% of rdg + 4dgts) 250V 0.1V 600VAC/DC 600V 1V Resistance 250Ω 0.1Ω ±(0.3% rdg + 3dgts) 2.5kΩ 1Ω ±(0.3% rdg + 1dgts) Open ckt. V: 0.4VDC 25kΩ 10Ω 250kΩ 0.1kΩ 2.5MΩ 1kΩ 25MΩ 10kΩ ±(3.5% rdg + 4 dgts) Capacitance 250nF 0.1nF ±(5.0% rdg + 10dgts) (Autoranging) 2.5uF 1nF 25uF 10nF Frequency 5Hz 0.001Hz ±(0.05% rdg + 2dgts). (Autoranging) 50Hz 0.01Hz Sensitivity: 1.0V min. 500Hz 0.1Hz 5kHz 1Hz Temperature -4 o F to 0.1 o F/1 o F ±(2.0% rdg + 6 o F) 4 o F to 923 o F (Type K thermocouple) 2498 o F ±(3.0% rdg + 4 o F) 923 o F to 2498 o F Duty Cycle (2Hz-1kHz) 10%-90% 0.1% ±5dgts@2Vrms min Pulse Width : 50uSec Continuity Audible alert <100Ω; 500VDC/AC Diode Accuracy: ±(3.0% rdg + 3dgts); Resolution: 1mV. Test current: 0.25A ±0.2mA; Test voltage: <1.6V. 2 403380 Ver. 1.01 7/99
3. FRONT PANEL DESCRIPTION 1 Positive test lead (in meter jack) 2 Negative test lead (in meter jack) 3 Negative test lead (test end) 4 LCD Display 5 Select key 6 Temperature, duty cycle, Hz key 7 Data Hold / Backlight key 8 Function switch 9 Handle 10 Thermocouple input socket (top) 4. SAFETY INFORMATION The following safety information must be observed to insure maximum personal safety during the operation of this meter: 1. Do not use the meter if the meter/test leads appear damaged or if you suspect that the meter is not operating properly. 2. This meter is not recommended for high voltage industrial use; for example, not for measurements of 440 VAC or 600 VAC industrial power mains. The unit is intended for use with low energy circuits to 600V AC/DC or high energy circuit to 250VAC or DC. 3. Use caution when working > 60V dc / 30V ac rms. Such voltages pose a shock hazard. 4. When using the probes, keep your fingers behind the finger guards on the probes. 5. Measuring voltage which exceeds the limits of the meter may cause damage and expose the operator to a shock hazard. Always respect the voltage limits as stated on the meter. 6. If the equipment is used in a manner not specified by the manufacturer, the protection provided by the instrument may be impaired. 7. Refer to the following International Safety Symbols 3 403380 Ver. 1.01 7/99
5. PREPARATION FOR MEASUREMENT Before attempting measurements, read the Safety Information in Section 4. Always examine the instrument for damage, contamination (excessive dirt, grease, etc.) and defects. Examine the test leads for cracked or frayed insulation. If any abnormal conditions exist do not attempt any measurements. 5.1 Auto Power-OFF mode If unused for about 30 minutes, the meter will power down automatically. To disable Auto Power-OFF mode, press the SELECT key while powering the meter. 5.2 Backlight / Data-Hold key Press this key briefly to activate the Data Hold mode. The "H" annunciator will appear on the LCD and the measurement data will freeze. Press and hold this key for 2 seconds to turn the LCD backlighting on. Briefly press the key to return to normal display. To turn the Backlight off press and hold again for 2 seconds. 5.3 Function Switch Lower position (O) is power off mode, center position is voltage mode, and top position is diode, continuity, capacitance, temperature, and resistance mode. 5.4 SELECT key Press the yellow SELECT key to choose AC or DC volts when the voltage mode is selected via the FUNCTION key. Press the SELECT key to choose the desired measurement function when the FUNCTION switch is set to the diode/continuity/ohms/capacitance mode. For reference, observe the display icons as each mode is selected. 5.5 Hz, o F, % key When the Function switch is in the upper position (diode/continuity/ohms/capacitance/temperature modes), the Hz (frequency), o F (Temperature), % (Duty Cycle) key permits the user to select the temperature function. If the FUNCTION switch is set to the voltage position, the Hz/ o F/% key permits the selection of Frequency, Duty Cycle, or Voltage. Observe the LCD function icons to be sure of which function is currently selected. 4 403380 Ver. 1.01 7/99
6. OPERATION 6.1 Voltage Measurements 1. Connect the red test lead to the "V" jack and the black test lead to the "COM" jack. 2. Set the FUNCTION switch to voltage and press the yellow Select key to choose AC or DC (the AC icon will appear on the LCD, the DC mode is implied). 3. Connect the test leads to the device or circuit being measured. 4. For dc, a (-) sign is displayed for negative polarity; positive polarity is implied. 6.2 Frequency Measurements 1. Set the FUNCTION switch to voltage and press the Hz/%/ o F key to scroll through the voltage/frequency/duty cycle modes. Select Frequency (Hz will appear on the LCD). 2. Connect the red test lead to the "V" jack and the black test lead to the "COM" jack. 3. Connect the test leads to the point of measurement and read the LCD. 6.3 Duty Cycle Measurements 1. Set the FUNCTION switch to voltage and press the Hz/%/ o F key to scroll through the voltage/frequency/duty cycle modes. The % mode represents duty cycle. 2. Connect the red test lead to the "V " jack and the black test lead to the "COM" jack. 3. Connect the test leads to the point of measurement. The display will indicate 0.1% to 99.9% duty cycle. 6.4 Resistance Measurements 1. Set the FUNCTION switch to the Ω position. 3. Connect the red test lead to the "V" jack and the black test lead to the "COM" jack. 4. Touch the probes to the test points and read the resistance display. 6.5 Diode Tests 1. Set the FUNCTION switch to the diode position. 3. To scroll through the continuity/diode/capacitance/resistance modes, press the yellow SELECT key. Select diode by observing the diode symbol on the LCD while scrolling. 4. Touch probes to the diode (Red lead to Anode, Black lead to Cathode of diode). A correct forward-voltage drop is about 0.6V (silicon diode) or 0.3V (germanium). 5. Reverse the probes. If the diode is good, "OL" will display. If the diode is shorted, ".000" or another small number will display. If the diode is open, "OL" is displayed, in both directions. 6. If a diode s junction is measured in circuit and a low reading is obtained, the junction may be shunted by a resistance of less than 1k. In this case the diode must be disconnected from the circuit for accurate testing. 6.6 Continuity Measurements 1. Set the FUNCTION switch to the continuity position (same position as diode). 3. To scroll through the continuity/diode/capacitance/resistance modes, press the SELECT key. 4. Connect the test leads to the two points for which continuity is to be tested. The audible tone will sound if the resistance is less than approximately 100 Ω. 5 403380 Ver. 1.01 7/99
6.7 Capacitance Measurements 1. Set the FUNCTION switch to the capacitance position. 3. To scroll through continuity/diode/capacitance/resistance modes, press the SELECT key. 4. Discharge capacitors before trying to measure them. 5. Connect the "+" lead to the "V" jack and the "-" lead to the "COM" jack. 6. Touch the test leads to the capacitor, observing polarity of electrolytic capacitors, and read the capacitance value on the LCD. 6.8 Temperature Measurements 1. Set the FUNCTION switch to the " o F" position and press the " o F key to toggle the ohms/ o F modes. 2. Connect a Type-K thermocouple to the jack on the instrument. Place the probe or thermocouple tip on or in the material to be measured and read the temperature on the display. 6 403380 Ver. 1.01 7/99
7. MAINTENANCE 7.1 Battery Replacement Power is supplied by four 1.5V (AAA size) batteries. The low battery icon (symbol of a battery on lower left corner of LCD) appears on the LCD display when replacement is necessary. To replace the batteries, remove the rear screw and open the battery compartment with your thumb. Remove and replace with fresh batteries. Reinstall battery compartment cover. 7.2 Cleaning Periodically wipe the case with a damp cloth and detergent, do not use abrasives or solvents. 8. CALIBRATION / REPAIR SERVICES Extech offers complete repair and calibration services for all of the products we sell. For periodic calibration, NIST certification or repair of any Extech product, call customer service for details on services available. Extech recommends that calibration be performed on an annual basis to insure calibration integrity. 9. WARRANTY EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and workmanship for one year from date of shipment (a six month limited warranty applies on sensors and cables). If it should become necessary to return the instrument for service during or beyond the warranty period, contact the Customer Service Department at (781) 890-7440 for authorization. A Return Authorization (RA) number must be issued before any product is returned to Extech. The sender is responsible for shipping charges, freight, insurance and proper packaging to prevent damage in transit. This warranty does not apply to defects resulting from action of the user such as misuse, improper wiring, operation outside of specification, improper maintenance or repair, or unauthorized modification. Extech specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and will not be liable for any direct, indirect, incidental or consequential damages. Extech's total liability is limited to repair or replacement of the product. The warranty set forth above is inclusive and no other warranty, whether written or oral, is expressed or implied. 7 403380 Ver. 1.01 7/99