Handheld Spectrum Analyzer HSA2030/HSA2016 Series V1.0.0

Transcription

1 USER S MANUAL Handheld Spectrum Analyzer HSA2030/HSA2016 Series V1.0.0

2 Notice Qingdao Hantek Electronic co., Ltd. All Rights Reserved. Qingdao Hantek Electronic co., Ltd. reserves the right to modify or change parts of or all the specifications without special notification. Qingdao Hantek Electronic co., Ltd. promises that the information is all correct and reliable but does not guarantee no mistake in this document. Please confirm that the relevant document and specification is the latest valid version before using. If needs any help from third-party products, patents or works when using Hantek document or product, please be liable to get the approvement and authorization from the third-party company. It is not Hantek s responsibility to get the above approvement and authorization.

3 Contents CHAPTER1 QUICK START Instrument Introduction General Inspection To Prepare for Use... 9 CHAPTER2 OPERATING BASICS Front Panel Menu Reference Front Panel Function Keys Numeric Keyboard Top Panel Side Panel Right Panel Left Panel User Interface Menu Operation Parameter Setting CHAPTER3 BASIC SETTINGS Basic Settings FREQ SPAN AMPT Sweep and Function Settings BW Sweep Trace Marker Measurement Shortcut Key Auto Preset Utility CHAPTER4 TEST CASE Testing Low Level Signal Reduce the Loss of Input Reduce the Resolution Bandwidth Trace Average Measuring Signal Distortion CHAPTER5 SCPI PROGRAMME SCPI Brief Introduction Basic Knowledge Requirement Command Syntax Standard Notations Punctuation Separator Default unit of parameters Common Commands... 49

4 5.2.1 Clear Status Identification Query Reset ABORt Command CALCulate Subsystem CALCulate: MARKer Subsection DEMOdulation Subsystem AM Demodulation FM Demodulation DISPlay Subsystem Trace Y-Axis Scaling Trace Y-Axis Reference Level Trace Y-Axis Reference Level Offset TRACe Subsystem Read appointed trace data Select trace display mode Set trace average time Set on/off of the average function in appointed trace Clear all trace FORMat Subsystem SENSe Subsystem FREQuency Subsection Span Mode Sweep Detection Bandwidth Average Power INITiate Subsystem Continuous Sweep and Single Sweep Start Single Sweep TRIGger Subsystem Set Trigger Type Edge Trigger of External Trigger Trigger Level in Video Trigger UNIT Subsystem SYSTem Subsystem Power off the Instrument Restart the Instrument Preset CHAPTER6 SPECIFICATIONS Technical Specifications CHAPTER7 APPENDIX Appendix A:Accessories Appendix B: Services and Support CHAPTER8 GENERAL CARE AND CLEANING General Care Cleaning... 70

5 General Safety Summary Please review the following safety precautions carefully before putting the instrument into operation so as to avoid any personal injuries or damages to the instrument and any product connected to it. To prevent potential hazards, please use the instrument only specified by this manual. The reparation could only be executed by professional authorized personnel. Avoid fire and personal injury. Use Proper Power Cord. Ground the Instrument. The instrument is grounded through the Protective Earth lead of the power cord. To avoid electric shock, it is essential to connect the earth terminal of power cord to the Protective Earth terminal before any inputs or outputs. Observe all Terminal Ratings. To avoid fire or shock hazard, observe all ratings and markers on the instrument and check your manual for more information about ratings before connecting. Do Not Operate Without Covers. Do not operate the instrument with covers or panels removed. Avoid Circuit or Wire Exposure. Do not touch exposed junctions and components when the unit is powered. Do Not Operate With Suspected Failures. If you suspect damage occurs to the instrument, have it inspected by qualified service personnel before further operations. Any maintenance, adjustment or replacement especially to circuits or accessories must be performed by HANTEK authorized personnel. Keep Well Ventilated. Do Not Operate in Wet Conditions. Do Not Operate in an Explosive Atmosphere. Keep Product Surfaces Clean and Dry.

6 Model Number The model in HSA2000 Series instrument Instrument Model Number Model No. Spectrum Analyzer TG DMM DSO HSA2030A 9 khz to 3.2 GHz (1.6GHz) HSA2030B 9 khz to 3.2 GHz (1.6GHz) 5M-3G HSA2030C 9 khz to 3.2 GHz (1.6GHz) 5M-3G 6000COUNTS HSA2030D 9 khz to 3.2 GHz (1.6GHz) 5M-3G 6000COUNTS YES HSA2030E 9 khz to 3.2 GHz (1.6GHz) 6000COUNTS YES Model No. Spectrum Analyzer TG DMM DSO HSA2016A 9 khz to 1.6 GHz HSA2016B 9 khz to 1.6 GHz 5M-1.6G HSA2016C 9 khz to 1.6 GHz 5M-1.6G 6000COUNTS HSA2016D 9 khz to 1.6 GHz 5M-1.6G 6000COUNTS YES HSA2016E 9 khz to 1.6 GHz 6000COUNTS YES

7 Chapter1 Quick Start Instrument Introduction General Check Preparation

8 1.1 Instrument Introduction HSA2000 series spectrum analyzers which are small, light and cost-effective, are portable spectrum analyzers designed for starters. Configured with easy-to-operate numeric keyboard, high-resolution color LCD display and various remote communication interfaces, they can be widely used in various fields, such as education, company research and development as well as industrial manufacture. Main features: Frequency Range: 9 khz to 3.2 GHz (1.6GHz) Displayed Average Noise Level (DANL): -135 dbm (Typical) Phase Noise: khz offset Total Amplitude Accuracy: <1.5 db Minimum Resolution Bandwidth (RBW): 100 Hz VSWR Measurement Kit(Option) Standard with Preamplifier 5.7 inche ( pixels) high-definition display with clear, vivid, and easy-to-use graphical interface Various interfaces such as LAN, USB Host, USB Device

9 1.2 General Inspection 1. Inspect the shipping container for damage Keep the damaged shipping container or cushioning material until the contents of the shipment have been checked for completeness and the instrument has passed both electrical and mechanical tests. 2. Inspect the instrument In case of any damage, or defect, or failure, notify the Hantek representative. 3. Check the accessories Please check the accessories according to the packing lists. If the accessories are incomplete or damaged, please contact the Hantek representative. 1.3 To Prepare for Use This chapter introduces the basic process to help you fast start to use the instrument. Prepare the instrument. 1. To Connect to Power Please use the power cord provided with the accessories to connect the spectrum analyzer to AC power source. Press the power switch on lower left of front pannel to turn on the instrument. 2. Power-on Inspection After connecting the instrument to power source correctly, press at the front panel to start the spectrum analyzer. Following the start-up screen which shows the start-up initialization process information, the sweep curve is displayed.

10 Chapter2 Operating Basics Front Panel Menu Reference Top Panel Side Panel User Interface Menu Operation Parameter Setting

11 2.1 Front Panel Menu Reference 1. LCD 2. Menu softkeys/menu control keys 3. Charge indicator (Only lights up when charging) 4. Knob 5. Direction keys 6. Numeric Keyboard 7. Power switch (Lighting-normal work status) 8. Function key area

12 2.1.2 Front Panel Function Keys FREQ: Set the center, start and stop frequency; enable the signal tracking function. SPAN: Set the frequency span of the sweep. AMPT: Set the reference level, RF attenuator, scale and the unit of Y-axis, etc. Set the reference level offset, maximum mixing level and input impedence. Execute auto scale and auto range as well as turn on the RF preamplifier. BW: Set the resolution bandwidth (RBW) and video bandwidth (VBW). Select average type. SWEEP: Set the sweep and trigger parameters. TRACE:Set the parameters related to trace and filter types. MEAS: Select and control the measurement function MODE:Select mode FILE:Save files UTILITY:Auxiliary function MARKER:Read the amplitude, frequency and sweep time of a certain point on the trace. PEAK:Open the peak search menu and search for peaks immediately. MARKER:Set other system parameters on the basis of the current marker value. COUNT: Frequency counter function PRESET: Restore the system to factory settings or user-defined state. AUTO: Search for signals automatically within full frequency range Numeric Keyboard HSA2000 Series provides a numeric keyboard at the front panel (as shown in the figure below). The numeric keyboard which supports the Chinese characters, numbers and common symbols (including decimal point, and -) are mainly used to edit file or folder name.

13 The numeric keyboard consists of the following parts: 1. The input mode is fixed at number input during parameter setting. During parameter setting, press this key to input the symbol ( - ) of the figure. When the key is pressed for the first time, the parameter symbol is -. Press to switch among Chinese, English and number input during file or folder name editing. 2. Number/Letter Multiplexing keys for numbers and letters. They are used to directly input the desired number or letter. 0 is the multiplexing key for 0. Press this key to input 0 in number input. 3. Press this key to input a decimal point at the current cursor position in number input. 4. ENTER When pressed during parameter editing process, the system will complete the input and insert a default unit for the parameter automatically. While in the process of file name editing, this key is used to input the character currently selected by the cursor. 5. ESC CANCEL During parameter editing process, press this key to clear the inputs in the active function area and exit parameter input. While in the process of file name editing, press this key tol delete characters that have been entered. Press this key to turn off the display of the active function area when the main measurement screen is displayed. Press this key to exit the current test mode in keyboard test. Press this key to unlock the screen when it is locked. 6. BACK During the process of parameter editing, press this key to delete the character on the left of the cursor. While in the process of file name editing, press this key to delete the character on the left of the cursor.

14 2.2 Top Panel 1. RF OUT Connector: The output for the built-in tracking generator. Enabled with Option TG3. 2. EXT TRIG IN/REF IN (BNC, Female): Connects to an external TTL signal or a 10 MHz reference signal. The TTL signal is used to the analyzer s internal sweep. 3. RF IN Connector (50 Ω): Accepts an external input with a frequency range from 100 khz to 3 GHz(1.6GHz), tunable to 9 khz. 2.3 Side Panel Right Panel Right Panel 1. USB interface (Device) Connects to a PC 2. WAN Interface Connects to a PC for SCPI remote control 3. USB interface (Host) Connects to a USB memory stick or disk 4. External DC power connector Provides input for the DC power source via an AC-DC adapter, or Automotive type DC adapter

15 2.3.2 Left Panel 5 6 Left Panel 5. Headphone Connects to a headphone 6. SD card slot

16 2.4 User Interface User interface: 1. Hantek Logo 2. Time: System time 3. USB storage device status: is displayed when USB storage device is installed. 4. Operation status: Display Local (in local mode) or Rmt (in remote mode). 5. Power display 6. Reference level:reference level value 7. Attenuator settings: Attenuator settings 8. SWT Value 9. Marker value: Cursor X: Current X value of the cursor. Note that X indicates different physical quantities in different functions. Cursor Y: Current Y value of the cursor. Note that Y indicates different physical quantities in different functions. 10. Trace 1 Detector type: Normal, Pos peak, Neg peak, Sample, RMS Avg. 11. Trace 2 Detector type: Normal, Pos peak, Neg peak, Sample, RMS Avg. 12. Trace 3 Detector type: Normal, Pos peak, Neg peak, Sample, RMS Avg. 13. Trace 4 Detector type: Normal, Pos peak, Neg peak, Sample, RMS Avg. 14. Sweep mode: Continuous or Single sweep (with current number of sweeps)

17 15. Trigger type: Free. 16. Average type: Average type in BW, logarithmic power, power, voltage. 17. Preamplifier status: Enable or disable the preamplifier. 18. Average times: Average times of trace. 19. Menu title: Function of the current menu. 20. Menu items: Menu items of the current function. 21. Menu page number:show the total number of pages and current page number. 22. Center frequency: The frequency range of the current sweep channel can be expressed by a combination of center frequency and span or a combination of start frequency and stop frequency. 23. Span: The frequency range of the current sweep channel can be expressed by a combination of center frequency and span or a combination of start frequency and stop frequency. 24. RBW:Resolution bandwidth. 25. VBW:Video bandwidth. 26. Spectrum line display area: Spectrum line display area. 27. Y scale: Label of Y scale. 28. Manual setting: The corresponding parameter is in manual setting mode. 2.5 Menu Operation There are 6 types of menus according to their operation modes. Each type of menu and its operation method are introduced below. 1. Parameter Input When selected, use the numeric keys to modify the parameters directly. For example, select Center Freq, input the desired figure and select proper unit to change the center frequency. 2. State Switching Press the corresponding menu key to switch between the sub-options. For example, press Signal Track to enable or disable the signal tracking function. 3. Enter Lower Menu (with parameter) Press the corresponding menu key to enter the lower menu and change the option currently selected. For example, press AMPT to enter the lower menu. Select dbm and return to the previous menu. The unit of Y-axis changes to dbm.

18 4. Enter Lower Menu (without parameter) Press the corresponding menu key to enter the lower menu. For example, press Corrections to enter directly. 5.Function Switch + Parameter Input Press the corresponding menu key to switch between functions; change the parameter directly using the numeric keys. For example, press CF Step to switch between Auto and Manual ; if Manual is selected, you can directly input the desired number to change the CF Step. 6. State Selection Press the corresponding menu key to modify the parameter and return to the menu one level up. For example, press MARKER NORMAL to select normal state. It means MARKER is in normal state. 2.6 Parameter Setting Users can enter the desired parameter values using the numeric keys, knob, or direction keys. This section describes the three methods of parameter setting through an example (to set the center frequency to 800 MHz). 1. Use the numeric keyboard 1) Press FREQ Center Freq; 2) Input 800 using the numeric keys; 3) Select MHz by selecting the desired unit from the popup menu. 2. Use the knob When the parameter is editable (namely when the parameter is selected), turn the knob clockwise to increase or counterclockwise to decrease the parameter value at specified step. 1) Press FREQ Center Freq; 2) Rotate the knob until the parameter is set to a certain value (800 MHz). 3. Use the direction keys When the parameter is editable (namely when the parameter is selected), you can increase or decrease the parameter value at specific step using the direction keys. 1) Press FREQ Center Freq; 2) Press up/down direction key until the parameter is set to a certain value (800 MHz).

19 Note: in the storage function, the direction keys can also be used to select the current path or file.

20 Chapter3 Basic Settings This chapter describes in detail the function keys at the front panel and the associated functions. Subjects in this chapter: Basic Settings Sweep and Function Settings Marker Measurements Shortcut Key

21 3.1 Basic Settings FREQ Set the frequency parameters of the analyzer. The analyzer sweeps within a specified frequency range, and the sweep is restarted every time you change the frequency parameters. The frequency range of a channel can be expressed by either of two groups of parameters: Start Frequency and Stop Frequency(fstart/fstop); or Center Frequency and Span(fcenter/ fspan). If any of the parameters is changed, the others would be adjusted automatically in order to ensure the coupling relationship among them: f center = fstop fstart /2 f span = fstop fstart Center Freq Set the center frequency of the current channel. Press this key to switch to center frequency input mode and the center frequency is displayed at the lower left and right sides of the grid respectively. Key Points: The start and stop frequencies vary with the center frequency when the span is constant. Changing the center frequency horizontally shifts the current channel and the adjustment is limited by the specified frequency range. In Zero Span mode, the start frequency, stop frequency and center frequency are always the same. You can modify this parameter using the numeric keys, knob or direction keys. Refer to Parameter Setting for more details. Center Frequency Parameter Default Range* Unit Knob Step Direction Key Step Explanation 3.2 GHz (1.6GHz) 0 Hz to 3.2 GHz (1.6GHz) GHz, MHz, khz, Hz Span > 0, step = Span/200 Span = 0, step = RBW/100 Min = 1 Hz CF step *Note: The range is from 50 Hz to [3.2 GHz (1.6GHz)-50 Hz] in non-zero span. Start Freq Set the start frequency of the current channel. Press this key to switch to start/stop frequency input mode and the start and stop frequencies are displayed at the lower left and right sides of the grid respectively. Key Points: The span and center frequency vary with the start frequency. The change of span would affect other system parameters. For more details, please refer to Span.

22 In Zero Span mode, the start frequency, stop frequency and center frequency are always the same. If one is changed, the others are updated to match. You can modify this parameter using the numeric keys, knob or direction keys. Refer to Parameter Setting for more details. Start Frequency Parameter Explanation Default 0 GHz Range* 100 Hz to 3.2 GHz (1.6GHz) Unit GHz, MHz, khz, Hz Knob Step Span > 0, step = Span/200 Span = 0, step = RBW/100 Min = 1 Hz Direction Key Step CF step *Note: The range is from 0 Hz to 3.2 GHz (1.6GHz)-100 Hz in non-zero span. Stop Freq Set the stop frequency of the current channel. Press this key to switch to start/stop frequency input mode and the start and stop frequencies are displayed at the lower left and right sides of the grid respectively. Key Points: The span and center frequency vary with the stop frequency. The change of span would affect other system parameters. For more details, please refer to Span. You can modify this parameter using the numeric keys, knob or direction keys. For more details, please refer to Parameter Setting. Stop frequency Parameter Explanation Default 3.2 GHz (1.6GHz) Range* 100 Hz to 3.2 GHz (1.6GHz) Unit GHz, MHz, khz, Hz Knob Step Span > 0, step = Span/200 Span = 0, step = VBW/100 Min = 1 Hz Direction Key Step CF step *Note: The range is from 100 Hz to 3.2 GHz (1.6GHz) in non-zero span. CF Step Set the step of center frequency. Changing the center frequency in a fixed step continuously switches the channel to be measured. Key Points: The CF step can be set in Manual or Auto mode. In Auto mode, the CF step is 1/10 of the span in Non-zero span mode or equals the RBW while in Zero span mode; in Manual mode, you can set the step using the numeric keys. After you set an appropriate CF step and select Center Freq, use up and down direction keys to switch between measurement channels in a specified step in order to sweep the adjacent channel manually. You can modify this parameter using the numeric keys, knob or direction keys. For more details, please refer to Parameter Setting. CF step Parameter Explanation Default 320 MHz Range 1 Hz to 3.2 GHz (1.6GHz) Unit GHz, MHz, khz, Hz Knob Step Span > 0, step = Span/200 Span = 0, step = 100 Hz Min =

23 1 Hz Direction Key Step in 1, 2, 5 sequence SPAN Set the span of the analyzer. The change of this parameter will affect the frequency parameters and restart the sweep. Span Set the frequency range of the current channel. Press this key to switch to center frequency/span input mode and the center frequency and span are displayed at the lower left and right sides of the grid respectively. Key Points: The start and stop frequencies vary with the span automatically. In manual span mode, the span can be set down to 100 Hz (the only way into the zero-span mode is pressing the Zero Span menu option) and up to the full span described in Specifications. When the span is set to the maximum, the analyzer enters full span mode. Modifying the span in non-zero span mode may cause an automatic change in both CF step and RBW if they are in Auto mode, and the change of RBW may influence VBW (in Auto VBW mode). Variation in the span, RBW or VBW would cause a change in the sweep time. You can modify this parameter using the numeric keys, knob, or direction keys. For more details, please refer to Parameter Setting. Span Parameter Explanation Default 3.2 GHz (1.6GHz) Range* 0 Hz to 3.2 GHz (1.6GHz) Unit GHz, MHz, khz, Hz Knob Step Span/200, Min = 1 Hz Direction Key Step in 1, 2, 5 sequence *Note: 0 Hz is available only in zero span. Full Span Set the span of the analyzer to the maximum. Zero Span Set the span of the analyzer to 0 Hz. Both the start and stop frequencies will equal the center frequency and the horizontal axis will denote time. The analyzer measures the time domain characteristics of the amplitude of the corresponding frequency point on the input signal. Key Points: As opposed to the Non-zero span, the screen shows the time domain characteristics of the fixed frequency component in zero span mode.the following functions are invalid in Zero span mode: Zoom In and Zoom Out in SPAN Zoom In Set the span to half of its current value. At this point, the signal on the screen is zommed in on to observe signal details.

24 Zoom Out Set the span to twice the current value. At this point, the signal on the screen is zoomed out on to gain more information about the signal AMPT Set the amplitude parameters of the analyzer. Through modifying these parameters, signals under measurement can be displayed in a proper mode for easier obsercation and minimum error. Ref Level Set the maximum power or voltage can be currently displayed in the window and the value is displayed at the upper left corner of the screen grid. Key Points: The maximum reference level available is affected by the maximum mixing level, input attenuation and preamplifier. When you adjust it, the input attenuation is adjusted under a constant maximum mixing level in order to fulfill the following inequality: LRef a RF a PA L mix L Ref RF a a PA 和 L mix denote the reference level, the input attenuation, the preamplifier and the maximum mixing level respectively. You can modify this parameter using the numeric keys, knob or direction keys. For more details, please refer to Parameter Setting. Reference level Parameter Default Range Unit Knob Step Direction Key Step Explanation 20 dbm -100 dbm to 30 dbm dbm, -dbm, mv, uv in Log scale mode, step = Scale/10 in Lin scale mode, step = 0.1 dbm in Log scale mode, step = Scale in Lin scale mode, step = 1 dbm Input Atten Set the front attenuator of the RF input in order to ensure big signals (or small signals) to pass from the mixer with low distortion (or low noise). Key Points: When the preamplifier is On, the input attenuation could be set up to 30 db. You can adjust the reference level to ensure that the specified parameter meets the inequality arf apa Lmix. You can modify this parameter using the numeric keys, knob or direction keys. For more details, please refer to Parameter Setting. L Ref Input attenuation Parameter Default Range Unit Explanation 40 db 0 db to 30 db db

25 Knob Step Direction Key Step 1 db 5 db Scale/Div Set the logarithmic units per vertical grid division on the display. This function is only available when the scale type is set to Log. Key Points: By changing the scale, the amplitude range available is adjusted. Scale Type Set the scale type of Y-axis to Lin or Log, the default is Log. Key Points: In Log scale type: the Y-axis denotes the logarithmic coordinate, the value shown at the top of the grid is the reference level and each grid represents the scale value. The unit of Y-axis will automatically switch to the default dbm in Log scale type when the scale type is changed from Lin to Log. In Lin scale type: the Y-axis denotes the linear coordinate, the values shown at the top of the grid and the bottom of the grid are the reference level and 0 V respectively. Each grid represents 10% of the reference level and the Scale/Div is invalid. The unit of Y-axis will automatically switch to the default Volts in Lin scale type when the scale type is changed from Log to Lin. The scale type does not affect the unit of Y-axis. Units Set the unit of the Y-axis to dbm, dbmv, dbuv, Volts or Watts. Wherein, dbm, dbmv, and dbuv are for Log scale; Volts and Watts are for Linear scale. The default is dbm. Key Points: The conversion relationships between units: 2 1 dbm = 10log Volts R 0.001W 6 Volts 10 dbuv = 20log 1uV 3 Volts 10 dbmv = 20log 1mV 2 Volts Watts = R Wherein, R denotes the reference resistance. Ref Offset Assign an offset to the reference level to compensate for gains or losses generated between the device under measurement and the analyzer. Key Points: The change of this value changes both the reference level readout and the amplitude readout of the marker, but does not impact the position of the curve on the screen. You can modify this parameter using the numeric keys. For more details, please refer to

26 Parameter Setting. Reference level offset Parameter Default Range Unit Knob Step Direction Key Step Explanation 0 db -300 db to 300 db db N/A N/A RF Preamp Set the status of the preamplifier located at the front of the RF signal path. Turning on the preamplifier reduces the displayed average noise level in order to distinguish small signals from the noise when the signal under measurement is small. Key Points: The corresponding icon the preamplifier is On. will be displayed in the status bar at the left side of the screen when Scale Value Scale Value is on the left of display area. Select ON, display. Select OFF, do not display. 3.2 Sweep and Function Settings BW Set the RBW (Resolution Bandwidth), VBW (Video Bandwidth) and detector type parameters of the analyzer. RBW Set the desired resolution bandwidth in order to distinguish between signals which are close in frequency. Key Points: Reducing RBW will increase the frequency resolution, but will increase the sweep time (Sweep Time is affected by a combination of RBW and VBW when it is in Auto mode). RBW decreases with the span (non-zero span) in Auto RBW mode. You can modify this parameter using the numeric keys, knob or direction keys. For more details, please refer to Parameter Setting. Note: if detector type is Quasi-Peak or filter type is EMI, RBW can be 200 Hz, 9 khz or 120 khz only. RBW (Filter Type is Gauss) Parameter Default Range Unit Knob Step Explanation 1 MHz 100 Hz to 1 MHz GHz, MHz, khz, Hz in 1, 3, 10 sequence

27 Direction Key Step in 1, 3, 10 sequence Video Bandwidth Set Video Bandwidth, shortform is VBW, to filter the noise out of the video band. Key Points: Reduce VBW can make the spectral line be smooth, and the small signal which is submerged in noise can stand out. But the scan time will be longer. (When scan time is automatic, it is influenced by RBW and VBW together). When VBW is automatic, it changes with RBW. But it is not influenced by RBW when manually. You can use numeric keys, knobs or direction keys to modify this parameter. The detail method refers to the specification in Parameter Setting. VBW Reference Parameter Instruction Default 1 MHz Range 1 Hz to 1 MHz Unit GHz, MHz, khz, Hz Knob Step in 1, 3, 10 sequence Direction Key Step in 1, 3, 10 sequence V/R Ratio Set the ratio of VBW and RBW. Key Points: When measure sine signals, normally choose 1~3 (to get shorter scan time). When measure pulse signals, choose 10 (to reduce the influence to the amplitude of nstantaneous signal). When measure noise signals, normally choose 0.1 (to get the average value of noise). You can use numeric keys, knobs or direction keys to modify this parameter. The detail method refers to the specification in Parameter Setting. V/R Ratio Reference Parameter Instruction Default 1 MHz Range ~ Unit N/A Knob Step in 1, 3, 10 sequence Direction Key Step in 1, 3, 10 sequence Sweep Set parameters about the Sweep and Trigger functions, including Time, Auto SWT, Mode, Numbers, Trigger type, etc. Mode Set the sweep mode to Single or Continue, the default is Continue. The corresponding icon of the sweep mode will be displayed in the status bar at the left side of the screen.

28 1. Single Set the sweep mode to Single. The number 10 on the parameter icon denotes the current sweep number. 2. Continue Set the sweep mode to Cont. The character Continue on the parameter icon denotes the analyzer is sweeping continuously. Key Points: If the instrument is in single sweep mode and no measurement function is enabled, press this key and the system will enter the continuous mode and sweep continuously if all the trigger conditions are satisfied. If the instrument is in single sweep mode and a measurement function is on, press this key and the system will enter the continuous sweep mode and measure continuously if all the trigger conditions are satisfied. In continuous mode, the system will send a trigger initialization signal automatically and enter the trigger condition judgment directly after each sweep. Single In single sweep mode, this menu is used to execute trigger initialization. After that, the analyzer will execute specified number of sweeps (or measurements) if all the trigger conditions are satisfied. Key Points: If the instrument is in continuous sweep mode and no measurement function is enabled, press this key and the system will enter the single sweep mode and execute specified number of sweeps if all the trigger conditions are satisfied. If the instrument is in continuous sweep mode and a measurement function is on, press this key and the system will enter the single measure mode and execute specified number of measurements if all the trigger conditions are satisfied. If the system is already in single sweep mode, press this key and the system will execute specified number of sweeps (or measurements) if all the trigger conditions are satisfied Trace The sweep signal is displayed as a trace on the screen. Select Trace This series allows for up to four traces to be displayed at the same time, and each trace has its own color. All traces can be set freely except Trace 4 (a math operation trace that can only be obtained using the other three traces). Select Trace 1, Trace 2 or Trace 3 to set the corresponding parameters. The default trace and type is Trace 1 and Clear Write. Trace Type Set the type of the current trace or disable it. The system calculates the sample data using a

29 specific operation method according to the trace type selected and displays the result. Trace types contain Clear Write, Max Hold, Min Hold, Video Avg, Power Avg and Freeze. The corresponding icon of the trace type will be displayed in the status bar at the left of the screen. Take Trace 1 (Green) as an example and the icons are as shown in the figure below. 1. Clear Write The trace continuously displays the points during the sweep of the analyzer. 2. Max Hold Maintain the maximum for each point of the trace, and update the trace point if a new maximum is generated in successive sweeps. 3. Min Hold Maintain the minimum for each point of the trace, and update the trace point if a new minimum is generated in successive sweeps. 4. Freeze Stop updating the trace data to observe the trace and read the measurement data. This type is generally used by traces loaded from storage devices or remote interface as default. 5. Blank Disable the trace display and all measurements of this trace. Average Times Set the number of averages of the selected trace. Key Points: More averages can reduce the noise and the influence of other random signals, thus highlighting the stable signal characteristics. The larger the number of averages is, the smoother the trace will be. You can use the numeric keys to modify this parameter, please refer to Parameter Setting for more details. Average times Parameter Explanation Default 100 Range 1 to 1000 Unit N/A Knob Step N/A Direction Key Step N/A Clear All Clear all the traces displayed on the screen. This operation will stop the current advanced measurement as there is not valid data source.

30 3.3 Marker Measurement Marker Marker is a diamond-shaped marker (As shown below), to mark the point in trace. Through the marker, you can read amplitude, frequency or the time point of scan on each point. Keypoints: It can show four pairs of marker on time at the most, but there is only one pair or one single You can use numeric keys, knobs or direction keys to modify this parameter. The detail 1. Marker Choose one of four markers, the default one is the first. After choosen, you can set the mode of marker, trace that is marked, reading method and other parameters. The marker which is opened currently should be marked on the trace chosen by marker trace. The reading on the marker from which is in activated status currently is shown on the right corner of the screen in active function area. Marker Paremeter Parameter Default Range Unit Knob Step Direction Key Step Instruction Center Frequency 0 ~ 3.2 GHz (1.6GHz) Reading = Frequency (or period), unit is GHz, MHz, khz, Hz (or ks, s, ms, us, ns, ps) Reading = Time (or reciprocal of time), unit is ks, s, ms, us, ns, ps (or GHz, MHz, khz, Hz) Reading = Frequency (or period), Step = Sweeping width/(sweep point - 1), Reading = Time (or reciprocal of time), Step = Sweeping time/(sweep point 1) Reading = Frequency (or period), Sweeping width/10 Reading = Time (or reciprocal of time), Step = Sweeping time/10 2. Normal One type of marker, used for measuring X value (frequency and time) and Y value (amplitude) of one point on the trace. When choose Normal, there will be a marker marked by the current marker on the trace, like 1. Keypoints: If there is no active marker, then you need to activate a marker in center frequency of current trace. Move the marker through inputing value by numberic keys, knobs or direction keys. The reading of current marker is shown on the right corner of screen. The resolution of reading on X-axis (frequency or time) is related with sweep width. Reduce the sweep width can get higher resolution. 3. Off Close the marker chosen currently, and the marder information and relative function shown in the screen will be closed too. 4. Marking trace Choose the trace marking by current marker as 1, 2, 3, 4.

31 5. Readout Set the reading method of marker X-axis, each marker can be set different reading type. This set only change the method of reading, not actual value. This set will influence the marker reading in active function area and the corner of screen. a) Frequency Normality marker shows absolute frequency when choose this type of reading method. Difference Value, Difference Value Pair and Span Pair marker shows the frequency difference of reference marker relative to differenct value marker. In the mode of non-zero sweeping width, the default reading method is Frequency. b) Period Normality marker shows the reciprocal of marker frequency, when choose this type of reading method. Difference Value, Difference Value Pair and Span Pair marker shows the reciprocal of frequency difference. When frequency difference is zero, the reciprocal is infinity. The reading is shown as >100Ts. This reading method can not be used in the mode of zero sweeping width. c) Time Difference Normality marker shows the time difference before the marker and the start of sweeping when choose this type of reading method.. Difference Value, Difference Value Pair and Span Pair marker shows the sweeping time difference between differenct value marker and reference marker. The default reading method is Time in the mode of zero sweeping width. 6. All Off Close all the markers which has been open and its realative function. Marker-> Use current marker value to set other system parameter of equipment (like center frequency, reference level, etc.). If there is no marker open, press Marker -> and activate a marker automativly. 1. Center Frequency Set center frequency of spectrum analyzer as the frequency of current marker. Center frequency is set as the frequency of marker when choose normality marker. Center frequency is set as the frequency of difference value marker when choose difference value, difference value pair and span pair marker. This function is invalid in the mode of zero sweeping width. 2. Intermediate Frequency Step Set intermediate frequency step of spectrum analyzer as the frequency of current marker. Intermediate frequency step is set as the frequency of marker when choosing normality marker. Intermediate frequency step is set as the frequency of difference value marker when choosing difference value, difference value pair and span pair marker. This function is invalid in the mode of zero sweeping width. 3. Start Frequency Set start frequency of spectrum analyzer as the frequency of current marker. Start frequency is set as the frequency of marker when choosing normality marker. Start frequency is set as the frequency of difference value marker when choosing difference value, difference value pair and span pair marker. This function is invalid in the mode of zero sweeping width.

32 4. Stop Frequency Set stop frequency of spectrum analyzer as the frequency of current marker. Stop frequency is set as the frequency of marker when choosing normality marker. Stop frequency is set as the frequency of difference value marker when choosing difference value, difference value pair and span pair marker. This function is invalid in the mode of zero sweeping width. 5. Reference Line Set reference level of spectrum analyzer as the frequency of current marker. Reference level is set as the amplitude of marker when choosing normality marker. Reference level is set as the amplitude of difference value marker when choosing difference value, difference value pair and span pair marker. Peak Open the setting menu of peak search, and excute the peak search function. Keypoints: When choose Max in the option of Search Parameter Peak Search, it means to look up the maximum value on the trace and mark with marker. When choose Parameter in the option of Search Parameter Peak Search, it means to look up the peak value that meets the search parameter on the trace and mark with marker. The peak value search of next peak, right peak and left peak should meet the condition of search parameter. When it can not find the peak meets the condition, it shows No peak is found in the screen. 1. Next Peak Looking up the peak which amplitude is just second to current peak and meets the search condition on the trace and marking with marker. 2. Peak Right Looking up the peak which is on the right side of current peak and the nearest peak that meets the search condition on the trace and marking with marker. 3. Peak Left Looking up the peak which is on the left side of current peak and the nearest peak that meets the search condition on the trace and marking with marker. 4. Min Search Looking up the minimum amplitude value on the trace and marking with marker. 5. Peak-Peak Search Execute peak search and minimum search at the same and mark with difference value pair marker. Including, the peak search result is marked with difference value marker. The minimum search result is marked with reference marker. 6. Continuous Search Open or close continuous search. The default is close. When open continuous search, the spectrum analyzer execute peak search once automaticly for tracking measurement signals after the end of each sweeping. The difference between continuous peak and signal tracking: Continuous peak always looks up maximum value in current frequency channel. Signal tracking always tracks the signal which has equal amplitude on the marker position before open this function, and set the frequency of corresponding signals as center frequency. 7. Search Parameter

33 Define the condition of peak search to search all kinds of peak. It can only be judged as peak when meanwhile meets the value of both peak excursn and peak thresh. 1) Peak Excursn Specify the difference value between peak and minimum amplitude on left and right side. The difference value which is higher than peak excursn can be judged as peak. Parameter Default Range Unit Knob Step Direction Key Step Instruction 10 db 0 db ~ 200 db db 1 db 1 db 2) Peak thresh Specify the minimum value of peak amplitude. The peak which is higher than peak thresh can be judged as peak. Parameter Default Range Unit Knob Step Direction Key Step Instruction -90 db -200 dbm ~ 0 dbm dbm -dbm mv uv 1 dbm 1 dbm 3) Peak Search Set the peak which is looked up in peak search is whether the maximum value on the trace or the peak meets search parameter. Choose Max Value, then look up the maximum value on the trace. Choose Parameter, then look up the peak meets the condition of search parameter on the trace. This set is only valid for the peak search excecuted when press Peak. 3.4 Shortcut Key Auto Search for signals automatically throughout the full frequency range and adjust the frequency and amplitude for optimum display effect of the signal, thus realizing one-key signal search and auto setting of parameters. Before Auto Search:

34 After Auto Search: Key Points: In the process of auto search, the backlight of Auto turns on and Auto Tune is shown in the status bar on the screen until the search is finished. Some parameters such as the reference level, scale, input attenuation and maximum mixing level may be changed during the auto search Preset Recall the preset setting and restore the analyzer to a specified status. Key Point: Press Preset to load the factory settings listed in the following table (except items marked with ** ) or User-defined settings.

35 Parameter Frequency Center Freq Start Freq Stop Freq CF Step Span Span Amplitude Ref Level Ref Offset Scale/Div Input Atten Default 1.6GHz (800MHz) 0 Hz 3.2 GHz (1.6GHz) Auto,150 MHz 3.2 GHz (1.6GHz) 40 dbm 20 db 5/DIV Auto,40 db Log dbm Off Scale Type Unit RF Preamp BW RBW Auto, 1 MHz VBW Auto, 1 MHz V/R Ratio 1 Sweep Time Auto,690 ms Auto SWT Normal Trace Select Trace 1 Trace Type of Trace 1 Clear Write Avg Times 10 Measure* Meas Fctn Off Marker Select Mkr 1 Mkr Type Normal Delta Pair Delta Span Pair Center Mkr Table Off Peak Cont Peak Off Peak Search Max Pk Excursn 10 db Pk Thresh -90 dbm Utility Set the system parameters 1. Save Press this key can save the screen as picture into U-stick.

36 2. Language This series supports multi-language menu. Press this key to select the desired display language. 3. Display Control the screen display of the analyzer, such as setting the graticule brightness, screen state, brightness. Brightness Set the LCD brightness of the analyzer. Default is 100. You can modify this parameter using the numeric keys, knob or direction keys. Backlight Keeping Set the On/Off status of backlight, default is Off 15s. It can be changed between On and Off. Graticule Set the brightness of the grid to highlight the display of the trace. You can modify this parameter using the numeric keys, knob or direction keys. 4. Setting This series spectrum analyzer can set reference clock, key tone, power by USB when shut down.

37 Reference Clock HSA2000 series provides internal clock or external clock. User can select the internal or external clock sourse directly. Default is internal clock. Keytone It can be turn on or off. Power by USB when shut down User can select whether it will still be powered by USB after shuting down. 5. Remote Control Users can control this sesies spectrum analyzer through USB or LAN remote interface. Remote Communication Select to use LAN or USB interface, or close them all. 6. Power On/Preset Power On/Preset includes power on, preset type, save as user. The user can set the power-on status according to the requirement. Power on The user can select power-on status as the last time or preset. The preset content refers to preset type. Preset Type The preset type includes Default, User, Last time. Default is the parameter of factory setting. User is the parameter that is saved by the user manually. Last time is the paremeter setting status that the user power off the equipment last time. Save User User can save the parameter of spectrum analyzer according to the requirement manully. Press Save User, then it shows saved. 7. Time/Date

38 The system time is displayed in hh:mm:ss YYYY-MM-DD format in the DSA800 user interface. The output file can include the time information when printing or storing interface image according to your setting. Set Time Set the display time of the analyzer. The time format should be hhmmss, for example, (denotes 23:12:11). Set Date Set the display date of the analyzer. The date format should be YYYYMMDD, for example, (denotes October 1st, 2011). 8. Diagnostics Screen Test Test whether the screen has a dot defect using five colors: White, Red, Green, Blue and Black. Key Test Enter the keyboard test interface. Press the function keys at the front panel one by one and observe whether the corresponding key lights. If not, an error may have occurred in that key. Note if the key at the front panel is transparent, its backlight will also light when you press it. To exit the test, press Esc three times. 9. Update User can update firmware. Plug in the U-stick within latest firmware file, the instrument will detect it. Click UTILITY update firmware. 10. System Information User can get the instrument information clearly. Click UTILITY SYSTEM INFORMATION. It includes firmware version, temperature, operation time of this time, power voltage.

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40 Chapter4 Test Case Testing Low Level Signal Testing Signal Distortion 4.1 Testing Low Level Signal This section introduces how to test low level signal, and how to differentiate it with the noice in the same spectrum. The following is three methods to test low level signal Reduce the Loss of Input The ability of spectrum analyzer to test low signal is limited by the noice produced internally. The level is influenced by input attenuator when signal passes the spectrum analyzer. If the signal is very close to the bottom of noise, it can differentiate the signal with the noice to reduce the loss of input. 1) Reset spectrum analyzer 2) Set the frequency of signal source and amplitude as 1 GHz and -80 dbm. Connect the RF OUT port of signal source to the RF IN port of spectrum analyzer and turn on the signal output. 3) Set center frequency, span and reference level: Press FREQ 1GHz Press SPAN 5MHz Press AMPT - 40dBm 4) Move the peak value that needed to the center of screen. Press MARKER Peak

41 1) Reduce the span to 1 MHz. If need, move the peak value to the center of screen again. Press SPAN 1 MHz 2) Set the attenuation as 20 db. Pay attention that when the attenuation increases, the bottom of noice will be more close to signal level. Press AMPT Attenuation 20dB 3) Press AMPT Attenuation 0 db, set the attenuation as 0 db.

42 4.1.2 Reduce the Resolution Bandwidth The internal noice level is influenced by resolution bandwidth, but continuous wave signal is not. Decrease RBW into 10%, and the bottom noise will also decrease 10 db. 1) Reset spectrum analyzer 2) Set the frequency of signal source and amplitude as 1 GHz and -80 dbm. Connect the RF OUT port of signal source to the RF IN port of spectrum analyzer and turn on the signal output. 3) Set center frequency, span and reference level: Press FREQ 1GHz Press SPAN 5MHz Press AMPT - 40dBm 4) Reduce resolution bandwidth. Press BW, and press manual. The resolution bandwidth can be reduced by knobs and arrow key. Because the noise level reduces, the low level signal will be clearer, as following picture.

43 4.1.3 Trace Average Taking the average is the digital processing. It is to plus current value in each trace point and previous average value, and then take the average. Choose the operation of taking average. When spectrum analyzer is doing the automatic coupling, it can make the displayed noise level get smooth to change detection mode into sampling mode. 1) Reset spectrum analyzer 2) Set the frequency of signal source and amplitude as 1 GHz and -80 dbm. Connect the RF OUT port of signal source to the RF IN port of spectrum analyzer and turn on the signal output. 3) Set center frequency, span and reference level: Press FREQ 1GHz Press SPAN 5MHz Press AMPT - 40dBm 4) Press TRACE Average (ON) to turn on the average function. Press 100 ENTER, set the number of average as 100. Because the operation of taking the average will make the trace be smooth, and the low level signal will be clearer.

44 4.2 Measuring Signal Distortion This selection introduces how to recognize and measure signal distortion. Recognize the distortion produced by spectrum analyzer. The high level input signal may cause the distortion signal produced by spectrum analyzer. This distortion signal will cover the true signal that needs to be measured in the input signal. The user can recognize these signals through trace and RF attenuator. If yes, this distortion is produced inside the instrument. In this case, we use a signal output by a function generator as signal source to recognize whether the harmonic distortion component is produced by spectrum analyzer. 1. Connect function generator to RF IN of spectrum analyzer. Set the input frequency and amplitude of signal source as 200MHz, -10dBm. 2. Set center frequency and span of spectrum analyzer. Press [PRESET] (to restore factory settings) Press [FREQ] 400MHz Press [SPAN] 700MHz The harmonic distortion component produced by this signal at the inputmixer of spectrum analyzer (arranged in turn with original 200MHz signal at 200MHz interval).

45 1. The center frequency should be changed as the frequency value at the first harmonic wave. Press [MARKER] PEAK 2. Change the span as 50 MHz, and display the signal in the center of screen again. Press [SPAN] 50MHz Press [MARKER] PEAK 3. Set the attenuation as 0 db: Press [AMPT] Attenuation 0dB 4. To recognize whether the harmonic distortion component is produced by spectrum analyzer, firstly display the input signal in trace 2: Press [TRACE] Trace 2 Press [TRACE] Clear 5. Place a Delta mark in the harmonic distortion component of trace 2: Press [MARKER] peak Press [MARKER] Delta

46 6. Press [AMPT] Attenuation 10dB to turn up the RF attenuation to 10 db. The reading of amplitude difference is influenced by two factors: 1) To increase input attenuation will make signal to noise ratio (SNR) worse which will cause the reading to be positive. 2) The loss of harmonic wave caused by internal circuit of spectrum analyzer will make the reading to be negative. To set the input attenuation can produce minimum reading.