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GA1000 Series User Manual

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1. User s Manual Version No V1 0 Announcement The content in this manual could be changed without prior notice NANJING GLARUN ATTEN TECHNOLOGY CO LTD provides no warranty of any kind to this manual and assumes no liability or responsibility for any mistakes possibly contained in the manual or any occasional or subsequent loss caused by using this manual Copyright 2012 NANJING GLARUN ATTEN TECHNOLOGY CO LTD All Rights Reserved Trademark Logo Guranllen is the registered trademark of NANJING GLARUN ATTEN meeueeee TECHNOLOGY CO LTD Declaration The products of the company are under protection of the People s Republic of China Patent that has been approved or is pending The company reserves the right to change the specifications and prices Limited by the People s Republic of China and international copyright laws any entities and individual cannot copy or spread the content of this manual including electronic manuals as well as translate the content into other languages without authorization of NANJING GLARUN ATTEN TECHNOLOGY CO LTD Security terms and characters Terms in this manual The following terms may appear in this manual Warning The warning announcement points out the operation or condition that may endanger the operators Notice AN The notice announcement points out the operation or condition that may cause damage to the product or other properties Terms on t
2. for 30min For self correction please disconnect all the probes or wires from the input connector then press UTILITY press Self correction in page 2 of the UTILITY menu and run the self correction program according to a screen prompt ipgeannect Evertthing from Al Figure 2 69 Self correction 2 12 4 Self test Press UTILITY and press Self test in page 2 of the UTILITY menu The self test includes screen test keyboard test and lightening test Operation steps 1 Screen test Select Screen test to skip to a screen test interface as shown in figure 2 70 At the moment the screen displays a prompt message of Press SINGLE key to continue Press RUN STOP key to exit namely start the test when prompting to press SINGLE Different colors are displayed on the screen Observe whether the screen has serious color cast or other display errors Figure 2 70 Screen test 2 Keyboard test Select Keyboard test to skip to a keyboard test interface as shown in figure 2 71 A rectangular region in the interface represents the key at the corresponding position on the panel a lathy rectangle represents the knob at the corresponding position of the panel and a square represents the press down function of the corresponding knob Test all the keys and knobs and observe whether the keys and knobs respond correctly The corresponding region of the screen will be in white during oper
3. 2 see eee di eatea aha Rehan 2 10 2 CUrsor Measurement lest a deed eel oe latacderl ain DVO 9 WIC AS UN STING IN are ee 2 11 Storage system eher el 2 12 Auxiliary SYSTOM ccc cccceseecsscsseesescosssesescessssssessecessssssesesconsseses census seesescensueseecessseaeecesen ZV Zale System Status een ee 2 12 2 Language selection Harn 2 123 Self COTE Oana N Py TES se ei ne ea E et ee ae 2 12 5 Firmware UPGFadiind eccceccsssseseccsscseseecescsnsseseecossssseecessanssesescansseseeceseseaee essa 2 gt 12 6 Test passed ee 2 12 7 Waveform reCOrdinnd cccccssssssescsssseseecescsnsseseecossseseecesssnssesesconseeseecessseaeecesn 212 8 Interface setting una ae 2 13 Help function ana 31 32 33 33 42 43 44 48 50 52 52 52 55 62 68 10 10 71 71 13 13 77 19 80 Chapter 3 Application Examples uu uuuuunnaan 1 3 1 Simple Measurement euskeee rt 3 2 Cursor Measurement aka 88 3 2 1 Measurement of width of Spike pulse OO 3 2 2 Measurement of amplitude of spike pulse neeen Od 33 Single Signal Gate MING Seene ea ee er 3 4 Detailed information of analysis signal BO 3 4 1 Noise signal observation eeeennsenenensnenennnenenennennen OO 3 4 2 Separation of signal from noise 0 3 5 Application of X Y function ueeseessesennensennensnennsen en nen men rar rer ee OL 3 6 Application of arithmetical operation in communication s
4. 60 C Forced cooling of fan lt 90 below 40 C Operating smaller than 3000m Non operating smaller than 15000m 339mmx149mmx111mm width x height x depth About 2 3kg Appendix B Default setup Menu or system CH1 CH2 MATH HORIZONTAL CURSOR MEASURE Option knob or key Coupling Bandwidth limit Volt div Probe Inverse phase Volt div Digital filter Operation FFT operation Signal source Window Horizontal amplification Vertical scale Window Position S div Window region time base Type Signal Voltage Time Signal source Default setup Direct current OFF Coarse tunning 1x OFF 200mV OFF CH1 CH2 CHI Hanning 1x dBVrms Main time base 0 0s 100us 5 0us OFF CH1 2 G 2G CH1 ACQUIRE DISPLAY SAVE RECALL REF UTILITY Type Three mode options Average time Interpolation type type Goon Waveform brightness Grid brightness Format Menu display Type Save to Set Signal source REFA REFB REFA REFB Source Frequency meter Back USB interface Peak to peak value Average value Amplitude Period Rise time sampling 4 Sine vector OFF 100 100 YT Infinite Save setup Equipment No 1 CH1 REFA OFF OFF OFF ON Computer TRIGGER EDGE TRIGGER PULSE TRIGGER VIDEO TRIGGER SLOPE Test passed Waveform recording RS 232 Type Signal source Slope Trigger mode Coupling Electric leve
5. measurement parameters Back to the measurement function menu 1 Table 2 39 All measurement function menu Option Setup Signal source Ei i u j CH2 Run Voltage Stop measurement Run Time Stop measurement Run Delay Stop measurement Back Table 2 40 Measurement types Measurement types Maximal value ENN Minimal value wl Peak to peak value Top value EPP Bottom value baal Description Select the input signal channel Run all measurement on the voltage type parameters Stop all measurement on the voltage type parameters Run all measurement on the time type parameters Stop all measurement on the time type parameters Run all measurement on the delay type parameters Stop all measurement on the delay type parameters Back to the measurement function menu 1 Description Peak forward voltage Peak inverse voltage Calculate the absolute difference between the maximal value and the minimal value of the whole waveform Maximum voltage of the whole waveform Minimum voltage of the whole waveform Amplitude Sia Periodic average value w Average value NJN Periodic mean YUV square root Mean square root EIN ROVERShoot FOVERShoot RPREShoot FPREShoot Rise time Fall time Pulse width Pl Positive pulse width Negative pulse width gt Positive duty ratio FH Negative duty ratio tf Phase KUN Voltage between the top value and the bottom
6. window constant amplitude sine waves with nearly equal frequency Hanning Better frequency resolution and worse amplitude resolution in comparison with Sine period and narrow band random noise rectangular window Hamming Frequency of window Hamming is a little better than that of window Transient or short pulse where the signal electric levels are considerably different there before and there after Hanning Blackman Best amplitude resolution Single frequency signal find higher subharmonic Worst frequency resolution Carry out the following steps to use FFT mode Set time domain waveform Access the signal to CH1 or CH2 and press AUTO to display a YT waveform Manually regulate the waveform display if necessary so as to ensure that the waveform does not surpass the screen and the screen displays a plurality of periods According to Nyquist law revolve s div to make the sampling rate at least two times the frequency of the input signal Display FFT spectrum Press MATH Select Operation as FFT Select the signal source as CH1 or CH2 Select a suitable window function Regulate spectrum amplitude gear and offset at page 2 of the FFT function menu so as to better observe FFT operation result Window function Frequency interval FFT spectrum amplitude FFT spectrum offset Figure 2 19 FFT Use cursor to measure the FFT s
7. 0 Content Summary The manual introduces related information about the operation of this series of digital oscilloscope and comprises the following chapters and sections Chapter Introduction introduces the front panel the user interface the function check and the probe compensation of the oscilloscope Chapter Function Introduction and Operation systematically introduces the function and operation of the oscilloscope in detail Chapter Application Example includes many measure examples offered for reference for users Chapter System Prompt and Fault Recovery introduces the system prompts and lists some simple faults and solutions so that the users are capable to rectify simple faults Chapter Service and Support introduces the warranty and technical support of this series of product Chapter Appendix A Technical Specification introduces the technical specification of this series of oscilloscope in detail Chapter Appendix B Default Setting lists related factory settings Chapter Appendix C Daily Maintenance and Cleaning introduces the way to maintain the oscilloscope Catalogue Chapter 1 Introduelion ssc cid l 1 1 Accidence of front panel and user interface nnnnnnenmnenn l 121 1 ERROR Panel ess ee energie 12152 Back Ofinstr ment aa Heel 1 2 EUNCLON Check ana alten D Ved WROD Gist ati teh etna aaah tat arabe 1 3 1 Probe Safely essen nee 1 3 2 Probe attenuator
8. Press the key to skip to page 2 of the menu Table 2 4 Function menu 2 of CH1 and CH2 Option Inverse Digital filter Back setup Run Stop Page2 2 Description Relative to the inverse phase waveform of a reference electric level Stop the waveform inverse function Press this key to skip to the digital filter menu Seen in table 2 5 Press the key to get back to page 1 of the menu Table 2 5 Digital filtration function menu Option Digital filter Filter type Filter Upper limit Filter lower Setup Run Stop Dot tat Last tct Description Run the digital filter Stop the digital filter Set the filter as low pass filter Set the filter as high pass filter Set the filter as band pass filter Set the filter as band reject filter Set the frequency upper limit using the UNIVERSAL knob Set the frequency lower limit using the UNIVERSAL limit knob Back Back to the main digital filter main menu f the channel adopts a DC coupling mode you can quickly measure the DC component of the signal by observing the difference between the waveform and the signal ground If the channel adopts an AC coupling mode the DC component in the signal is filtered By this mode the AC component of the signal is displayed at a higher sensitivity If the channel adopts a GND coupling mode cut off the input signal Inside the channel the channel input is connected with a zero volt reference electri
9. Stop replaying the waveform C Circularly replay the recorded waveform Replay mode Hi Replay the recorded waveform in single run oo Set the time interval of the replayed frame to Time interval frame Next Page 1 2 Skip to page 2 of the replay function menu play 34 Figure 2 79 Page 1 of waveform Figure 2 80 Page 2 of waveform replay menu replay menu Table 2 53 Page 2 of the waveform replay function menu Option Setup Description Start frame Set a start replay frame Current frame Display the current frame on the screen End frame Set the replayed end frame number Back Back to the main waveform recording menu Back Page 2 2 Back to page 1 of the replay function menu During replay the current frame number is displayed on the screen after replay is stopped the UNIVERSAL knob is used to observe all frames of waveforms between the start frame and the end frame The current recorded waveforms can be replayed by carrying out the following steps Press UTILITY to skip to the UTILITY menu Select Mode as Replay Select Replay mode as CC E Press Time interval to set the time interval of the replayed waveform frame to frame Press Next Page1 2 to skip to page 2 of the replay function menu Press Start frame and revolve the UNIVERSAL knob to regulate the start frame number of the replayed waveforms Press End frame and use the UNIVERSA
10. and the trigger signal source can be used for triggering in the third channel while acquiring data in two channels a Probe compensation The probe compensation signal is output and grounded so that the probe is matched with the channels of the oscilloscope This product is grounded by a protective ground wire of a power cord For avoiding electric shock please ensure that the product is reliably grounded before connecting the input end or output end of the product The ground wire of the probe is connected to the ground only Please do not connect the ground wire to high voltage 2 3 Default setups The default setups represent some option parameters that are set before the oscilloscope leaves factory for normal operations Default setup Figure 2 3 Default setup key The DEFAULT SETUP key represents the default setup function most of the options and control setups of the factory are recalled by pressing them some setups are not changed and the following setups are not reset e Language options e Saved standard waveforms e Saved setup files e Contrast ratio of display screen e Calibration data 2 4 UNIVERSAL knob Universal knob Figure 2 4 Universal knob This series of digital storage oscilloscope has a special knob UNIVERSAL knob by which the hold off time cursor measurement pulse width setup specified row in video trigger upper limit and lower limit of filter frequency horizont
11. at a specified time interval until reaching the set end frame number Table 2 51 Waveform recording function menu Option Setup Description Run Set a recording function menu Mode Stop Set a replay function menu Record Signal source Set a recording signal source Replay CH1 Set the maximal frame number for waveform End frame CH2 recording Time interval Set the time interval for waveform recording l b Start to record the waveform Operation E Stop recording the waveform As shown in figure 2 78 the operation steps of waveform recording are as follows 1 Press UTILITY to skip to the UTILITY menu 2 Press Next to skip to page 3 of the auxiliary menu 3 Press Waveform recording to skip to the RECORD menu 4 Press the Mode key to select Record 5 Press the Signal source key to select the signal channel to be recorded 6 Select the Time interval option and use the UNIVERSAL knob to regulate the time interval of frame to frame in waveform recording 7 Select the End frame option and use the UNIVERSAL knob to regulate the maximal frame number in the waveform recording 8 Press the Operation option to record the waveform Recording replay Replay the current recorded waveforms Table 2 52 Page 1 of the waveform replay function menu Option Setup Description Mode Replay Set a replay function menu l b Start to replay the waveform Operation E
12. can be pressed to perform force trigger once so as to finish acquisition of the current waveform The key is mainly applied to Normal and Single in the trigger modes Pre trigger delay trigger The key is used for triggering the sampled data before after the event The trigger position is generally set in the horizontal center of the screen so that the pre trigger and delay information can be observed The horizontal POSITION knob can be further revolved to regulate horizontal displacement of the waveform so as to check more pre trigger information or delay trigger information For instance if burrs generated by the circuit are caught the causes of generation of the burrs may be found out by observing and analyzing the pre trigger data Attention pre trigger and delay trigger are invalid at a slow scan state 2 7 1 Signal source The Signal source option can be used for selecting a signal as a trigger source for the oscilloscope The signal source may be any signal connected to channels BNC CH1 CH2 external triggers BNC EXT EXT 5 or an AC power line AC Line is only used for Edge trigger The EXT 5 setup option is used for expanding the external trigger electric level range 2 7 2 Types This series of oscilloscopes provide five trigger types Edge Pulse Video Slope and Alternation 1 Edge trigger the most basic as well as the most common trigger type as shown in figure 2 29 Table 2 13 Edge tr
13. display At the vector display mode the oscilloscope connects the sampling points in a digital interpolation manner and the interpolation manner includes linear interpolation and sine interpolation The sine interpolation manner is suitable for the real time sampling mode and is available at a time base of 50ns or faster at the real time sampling mode 2 10 Measurement system The oscilloscope can use scale and cursor for measurement or automatic measurement so that users can fully understand the measured signals 2 10 1 Scale measurement By using the method estimation can be made quickly and intuitively For instance waveform amplitude can be observed and a probable measurement result is judged according to the vertical scale The method realizes simple measurement by multiplying the vertical scale number of the signal with the vertical gear Volt div 2 10 2 Cursor measurement CURSORS is a function key for cursor measurement The cursor measurement includes two modes Manual mode and Tracking mode 1 Manual mode Horizontal cursors or vertical cursors appear in pair to measure time or voltage and the distance between the cursors can be manually regulated The signal source should be set as a waveform to be measured before the cursors are used 2 Tracking mode A horizontal cursor is intersected with a vertical cursor to form a cross cursor The cross cursor is automatically located on the waveform and the horizontal po
14. display TRIGGER menu 2 Press Type to select Pulse Setup of the pulse trigger is similar with that of the edge trigger Set the condition gt L positive pulse width gt L positive pulse width u Bd negative pulse width lt gt gt negative pulse width gt or e T negative pulse width Set the pulse width 4 Revolve the UNIVERSAL knob to set the pulse width Press Next Page 1 2 to skip to page 2 of the pulse trigger menu and set the trigger mode and the trigger coupling like the setup of the edge trigger Video trigger Perform field or row video trigger on a standard video signal Table 2 17 Page 1 of the video trigger function menu Option Setup Description Trigger an NTSC or PAL standard video Type Video signal when selecting video and preset the trigger coupling as alternating current CHI l CH2 l l Signal source See the signal source in 2 7 1 EXT EXT 5 ai Standard Trigger under negative synchronous pulse olarity u L Inverse phase Trigger under positive synchronous pulse All rows a Specified row l l BR Synchronization l Select suitable video for synchronization Odd field Even field Skip to page 2 of the video trigger Next Page 1 2 P pas 3 function menu u 20005 Os Syne Odd Field Next Page Figure 2 31 Page 1 of video trigger menu Figure 2 32 Page 2 of video trigger menu Table 2 18 Page 2 of the video trigger function men
15. of the menu on the screen 2 9 1 X Y mode Use the XY format to analyze phase difference At the format the voltage of channel 1 determines coordinate X horizontal of a point while the voltage of channel 2 determines coordinate Y vertical of the point The oscilloscope uses a non triggered sampling mode to display the data as a spot Figure 2 48 shows the YT mode and it shows that signals of the two channels have the same amplitude and frequency and the phase difference is 90 degrees After switching to X Y mode the waveform is shown in figure 2 49 below u 200mg i Grid Grid Fa B Menu Menu Displar Display almfinite Infinite Figure 2 48 Y T mode Figure 2 49 X Y mode The oscilloscope can acquire the waveform according to a normal YT mode at any sampling rate and can check the corresponding waveform at XY mode Control operation is as follows The Volt div and the vertical POSITION of channel 1 control the setup of the horizontal scale and position The Volt div and the vertical POSITION of channel 2 control the setup of the vertical scale and position Revolve the s div knob to regulate the sampling rate so as to observe the waveform better In XY display format the following functions are not available Waveform arithmetical operation Cursor Auto setup the display format is reset as YT Trigger control Horizontal position knob Vector display type e Scan type
16. slower than the main time base Figure 2 27 Window expansion Press the Window button after the window is set At the moment the waveform in the selected window is expanded to the full screen to display Figure 2 27 shows the expansion result after the window is set 2 7 Trigger system The trigger function of the oscilloscope can be synchronously horizontally scanned at the right point of the signal which is very important to signal display Trigger control can be used for stabilizing repeated waveform and acquiring single pulse waveform After the trigger is correctly set the oscilloscope can transform an unstable display result or blank as a significant waveform As shown in the figure below one knob and three keys are in the trigger control region TRIGGER lt _ Trigger electric level knob Figure 2 28 Trigger keys and knob TRIG MENU Press the key to recall the TRIGGER menu LEVEL knob Set a signal voltage corresponding to the trigger point to the trigger electric level for sampling Press the knob to set the trigger electric level as zero electric level SET TO 50 Use the key to quickly stabilize the waveform The oscilloscope could automatically trigger the electric level as a center electric level of the signal The key is very useful and can be used for quickly setting the trigger electric level FORCE No matter whether the oscilloscope detects the trigger the key
17. the oscilloscope 2 Press UTILITY to skip to the UTILITY menu 3 Press the Next option key to skip to page 3 of the auxiliary menu 4 Press Upgrade firmware 5 Press SINGLE to execute upgrading according to the scree prompt Reboot the machine after finishing upgrading and the software version is upgraded The oscilloscope should be self corrected once after upgrading Upgrading should be performed again by rebooting the machine if power is off or upgrading is failed during upgrading 2 12 6 Pass fail Pass fail is used for judging whether the input signal is in a built rule range and outputting the past or failed waveform so as to detect the change condition of the signal Table 2 47 Page 1 of the pass fail function menu Option Setup Description Run Run the pass fail function Test allowed l l Stop Stop the pass fail function Signal source CH1 Select the signal input channel selection CH2 gt Run pass fail Operation Stop pass fail Open waveform pass fail time display Display information information Close waveform pass fail time display information Next Skip to page 2 to the pass fail menu M 50005 0 08 PASS FAIL Figure 2 73 Page 1 of pass fail menu Figure 2 74 Page 2 of pass fail menu Table 2 48 Page 2 of the pass fail function menu Option Setup Description Pass Output a negative pulse train when the test is passed Output Fail Output a negative pulse train when
18. value detection average value 4 16 32 64 128 256 Vertical system Vertical sensitivity Channel voltage offset range Vertical resolution Channel amount Bandwidth AC plus accuracy DC measurement accuracy Rise time Vertical coupling Arithmetical operation FFT Bandwidth limit Horizontal system Time base Horizontal displacement range Display mode 2mV div 5V div 1 2 5 step by step 10div offset from the screen center 8bit 2 300MHz only to GA1302CAL 200MHz only to GA1202CAL 100MHz only to GA1102CAL 2mV div lt 4 the rest gears lt 3 DC measurement accuracy x reading 1 x vertical displacement reading 0 2div lt 1 2ns only to GA1302CAL lt 1 8ns only to GA1202CAL lt 3 5ns only to GA1102CAL AC DC GND FFT Window mode Hanning Hamming Blackman Sampling points 1024 20MHz 3dB 2ns div 50s div step 32 gears according to sequence 1 2 5 only to GA1102CAL GA1202CAL Ins div 50s div step 33 gears according to sequence 1 2 5 only to GA1302CAL Wherein 100ms div 50s div is the scan shift 100div Y T mode X Y mode X Y mode phase difference Display type Trigger system Trigger type Trigger signal source Trigger mode Trigger coupling Trigger electric level range Trigger sensitivity Hold off range Edge trigger Pulse width trigger Video trigger Slope trigger Alternating trigger Measurement system A
19. value of the waveform Arithmetic mean value of the waveform in the first period Calculate the arithmetic mean voltage in the whole recording Namely an effective value Calculate the actual mean square root value of the waveform in the first complete period Actual mean square root voltage of the whole waveform Ratio of the difference of the maximal value and the top value of the waveform to the amplitude after rising Ratio of the difference of the minimal value and the bottom value of the waveform to the amplitude after falling Ratio of the difference of the minimal value and the bottom value of the waveform to the amplitude before rising Ratio of the difference of the maximal value and the top value of the waveform to the amplitude before falling Measure the time between 10 and 90 of the first ride edge of the waveform Measure the time between 90 and 10 of the first fall edge of the waveform Duration time of a burst pulse Measure the whole waveform Measure the time between 50 of the electric level of the first rise edge and 50 of the electric level of an adjacent fall edge of the pulse Measure the time between 50 of the electric level of the first fall edge and 50 of the electric level of an adjacent rise edge of the pulse Ratio of the positive pulse width to the period Ratio of the negative pulse width to the period Periodically measure the time quantity that one waveform is earlier or later than another
20. 3 Check whether the probe is normally connected with a to be measured signal 4 Check whether a signal is generated at a to be measured signal point 5 Reacquire the signal once 3 Check whether the channel attenuation coefficient accords with the probe attenuation ratio actually used if the measured voltage amplitude is 10 times larger or 10 times smaller than the actual value 4 If waveform exists but not stable 1 Check whether the signal source option of the trigger panel accords with the signal channel actually used 2 Check the trigger type general signals apply EDGE TRIGGER mode video signals apply VIDEO TRIGGER mode and the waveform is only stably displayed when suitable trigger mode is applied 3 Try to change COUPLING into HIGH FREQUENCY RESTRIT and LOW FREQUENCY RESTRIT for display so as to filter high frequency noise or low frequency noise triggered by interference 5 If no waveform display during work Please check whether the trigger mode of the trigger panel is at the NORMAL or SINGLE position and whether the trigger electric level surpasses the waveform range if so center the trigger electric level or set the trigger mode as AUTO position or automatically finish the setups above by AUTO 6 If the display speed is lower after starting the average sampling mode or setting a long afterglow time It is normal 7 If waveform display is ladder li
21. Ade Negative slope lt Fe Negative slope Revolve the UNIVERSAL knob to set the Time setup Set time slope time Time setup range 20ns 10s Next Page 1 2 Skip to page 2 of the slope trigger menu lplimit Mode Figure 2 33 Page 1 of slope trigger menu Figure 2 34 Page 2 of slope trigger menu Table 2 20 Page 2 of the slope trigger function menu Option Setup Description Type Slope Upper boundary Vertical Lower boundary Select boundary and regulate the size of the window Upper and lower window by the LEVEL knob boundaries Auto Trigger mode Normal Single Setup Back Page 2 2 Operation description See the trigger mode in table 2 13 Skip to the trigger setup menu See table 2 14 Back to page 1 of the slope trigger menu Carry out the following steps to select Slope trigger type 1 Input a signal to channel 1 or channel 2 2 Press AUTO 3 Press TRIG MENU to skip to TRIGGER menu 4 Press Type to select Slope 5 Press Signal source to select CH1 or CH2 6 Press Condition to select slope condition 7 Press Time setup and revolve the UNIVERSAL knob to regulate the slope time 8 Press Next Page1 2 to skip to Page 2 of the slope trigger menu 9 Press Vertical window to select window boundary 10 Revolve the trigger electric level LEVEL knob until the waveform is stably triggered Alternating trigger When alt
22. L knob to regulate the end frame number of the replayed waveforms Press the Back Page 2 2 option key to get back to page 1 of the waveform replay function menu Press the Operation option to replay the waveform 2 12 8 Interface setup T he interface setup is used for setting RS 232 Baud rate and the Baud rate can be set as 300 2400 4800 9600 19200 or 38400 2 13 Help function This series of oscilloscope has one line help function that provides various language help information and the help information can be recalled at any time as needed during use HELP is a help function key and the user can enter or exit the help state by pressing the key The user can recall the corresponding help information by pressing the keys when entering the help state The submenus in each main menu have the corresponding help information Attention in order to check the help information of the options in the next page of the submenu please exit the help state at first switch to the next page of the menu then enter the help state again and then press the option key to check the corresponding help information Figure 2 81 shows the help information of CH1 M s0Ops Oo Os T Coup ine i i CHI is used te turn CHI channel on i The illuminating of CHI button indie EW Limit ates that LHI channel is active Turn the vertical SCALE knob to change the deflection factor of the channel i ION knob to move th
23. Over compensation of the probe may cause measurement errors or mistakes Figure 1 7 Probe compensation connection figure Set the probe coefficient to 10X in channel menu set the switch on the probe to x10 and connect the probe of the oscilloscope with channel 1 Connect the end part of the probe to the probe compensation connector IKHz clamping the connector GND by the ground clamp turn on the channel displayer and then press AUTO to display the waveform 3 Check the shape of the displayed waveform under compensated suitable compensated over compensated 4 If necessary rotate the adjustable capacitor on the probe handle to realize suitable compensated Function Introduction and Operation DIGITAL STORAGE OSCILLOSCOPE This chapter introduces the functional keys and operations of the front panel of the series of oscilloscope in detail For effectively using the oscilloscope the following functions of the oscilloscope are needed to be known Menu and control keys Connector Automatic setup Default setup Universal knob Vertical system Horizontal system Triggering system Signal acquisition system Display system Measurement system Save system Auxiliary system On line help system 2 1 Menu and control keys As shown in the figure below Figure 2 1 Control keys All the keys are described as follows CH1 CH2 display setup menus of channel 1 and channel 2 MATH d
24. Setting cece csc cs seecssseecesseecessseessesseecesessesescaneeecanaee ces 1 3 3 Probe compensation as a Chapter 2 Function Introduction and Operation 9 2 1 Menu and control buUtlonnernse ee as 2 2 CONNECTOR anne a a Nuns nn ane ac ll 2 32 Default sefting a rk A 24 UniversallKnob uutns en a a a a aa 3 25 WOTTICAl SY SUC IM oiskin ena a e a a S A 2 5 1 Channels CHI and CH 2 nceseenenensnsenenmnnennennnnenmnennnnesn nen emennennene 2 5 2 Application of POSITION and VOLT DIV knobs of the vertical system 20 2 5 3 Implementation of MATH function LO 2 5 4 Implementation Of REF function eeeenenennnnenenenen 21 2 6 Horizontal SYStTOM hu cece csscssseecsscseseecosssssseecossssseecesssease census ces sanssescsconssesessanseecessasseeees LO 2 6 1 Horizontal control KNOD Qu cc ccc ccccssssecsecsecsecsecocsse co ceeceeceesseseesessessessessestesssessees OO 2 6 2 Window expansion sien 2 rose er EA EEN 2 7 Triggering system eure 2 7 1 S1gNaksopUrce 2er une 27 2 WMO Ce des nenne a o a einsam 27 3 OUDING ze ee ae einlesen ZLATOJE hold O Nittel a 2 8 Signal acquisition SYSTEM ccccseseesescsscssseecesconsseseecesconssesescessseseecessssaeeseecessseaeecesen 29 Display System sie n a e E E E 29 k AY Mod Ease a a Heu 2 10 Measurement system uunnsnenannennnnnnnnennennennennunnnnnnennnnennennnnnnenannnennennenonnansannnennenenn 2 10 1 Scale measurement
25. This series of digital oscilloscope has a front panel that is simple but clear in function and is convenient for a user to finish basic operations Knobs and functional keys are arranged on the panel Five grey keys which have been arranged in a row on the left side of a display screen are option keys The current menu can be provided with different options The other keys are function keys that can be set in different functional menus or directly obtain specific function application The knobs can be used for quickly regulating the corresponding setups of the oscilloscope Attention in this specifications represents the keys and knobs of the oscilloscope and represents the menu options displayed in a program interface Function Keys Print Screen Universal Knob Menu Controls Auto Setup Advanced Trigger ControlsHorizontal Controls Vertical Controls a Pr phim Bun BE Probe Compensation Signal l Output Terminal Ground n i Terminal amp Power Button USB Port Menu On Off Input Channel External for Analog Signal Trigger Terminal Figure 1 1 Figure of Front Panel controls Q No M 200s 600 00Hs Y ee ee een pen Coupling AC FW Limit Volts Div Coarse Probe 1 Next Page SQW 2 9 Figure 1 2 Interface display Details Trigger status Armed The oscilloscope is acquiring pre triggering data All triggers are ignored in this state Ready The oscillosco
26. ail menu 7 Press Rule setup to skip to page 2 of the rule setup menu as shown in figure 2 75 8 Press Horizontal regulation and Vertical regulation and use the UNIVERSAL knob to regulate the horizontal tolerance range and the vertical tolerance range 9 Press Build rule to build a rule template or press the Recall key in the next page of the menu to recall the saved rules 10 Get back to skip to page 2 of the pass fail menu and set the Output option as pass 11 Get back to page 1 of the pass fail menu and press Operation to start As shown in figure 2 77 after the rules are built completely PASS starts counting if the signal of CH2 satisfies the rules during start and Pass would stop counting while Fail would start counting when the signal surpasses the set template the amplitude of the signal in the figure is smaller Pass Fail output The pass fail function can be used for outputting a negative pulse train through a Pass Fail BNC interface on a rear panel of the oscilloscope Figure 2 77 Pass Fail Test result Figure 2 78 Waveform recording 2 12 7 Waveform recording The waveform recording function can be used for recording waveforms input by channel 1 and channel 2 The user can set the time interval of the frames within Ims 999s At most 1000 frames of waveforms can be recorded The waveforms can be replayed after being recorded Waveform recording Record the waveforms
27. al scale Vrms Set Vrms as vertical scale unit dBVrms Set dBVrms as vertical scale unit Regulate FFT waveform spectrum amplitude a gear by UNIVERSAL knob Regulate FFT waveform spectrum offset by Om UNIVERSAL knob Back Page 2 2 Back to page 1 of the function menu FFT FFT Window As the oscilloscope is used for FFT transformation on waveform recording with finite length the FFT algorithm is based on periodic signal When the waveform period number within the finite length is an integer YT waveform has the same amplitude at the start point and the end point and no interruption is caused to the waveform But when the period number is not an integer the waveform has different amplitude at the start point and the end point so that high frequency transient interruption will be caused in the joint In a frequency domain this effect is named as leakage Therefore to avoid appearance of leakage the original waveform is multiplied with a window function and forcibly make the values at the start point and the end point be 0 Determine to use what kind of window according to the item and source signal characteristics to be measured Table 2 10 Description of FFT window function Window Characteristics Most suitable measuring points Best frequency resolution Transient or short pulse where the Rectang Worst amplitude signal electric level is approximately resolution equal there after there before and Be equivalent to no use of
28. al tolerance range and vertical tolerance range for regulating PASS FAIL function waveform frame number recording and playback in waveform recording function and the like can be changed The options for most of the menus can be selected by revolving the UNIVERSAL knob 2 5 Vertical system As shown in figure 2 5 below a series of keys and knobs are in the vertical control region VERTICAL Volt div knob Figure 2 5 Vertical knobs As seen in the figure above each channel has individual vertical menu key and knob for regulating the vertical gear and offset Moreover the waveform display of the corresponding channel can be started or stopped by pressing CH1 or CH2 2 5 1 Channels CH1 and CH2 Table 2 3 Function menu 1 of CH1 and CH2 Option setup Description Not only pass through the AC component of the input DC signal but also pass through the DC component of the input signal Coupling 2 Reject DC component of the input signal and an AC A signal lower than 10Hz GND Cut off the input signal Bandwidth RUN Limit the bandwidth to 20MHz and reduce the noise limit STOP Volt div Probe Next Coarse tuning Fine tuning 1X 10 X 100 X 1000 X Pagel 2 Define a 1 2 5 sequence 2mv div 5mv div 5V dIv Fine tuning changes the resolution as small step in coarse tuning setup The coefficient is matched with the attenuation coefficient of the probe used so as to obtain correct vertical reading
29. asured according to the following steps 1 Measure the frequency of the signal Display the MEASURE menu according to MEASURE Enter the measure type by pressing any option keys Select TIME MEASURE and enter TIME MEASURE menu The oscilloscope displays the corresponding automatic measurement result in a waveform region of a display screen according to a detected signal Selecta signal input channel according to SIGNAL SOURCE Select FREQUENCY according to measure type The corresponding icons and measurement values will be displayed in the third option 2 Measure peak to peak value of the signal Press the MEASURE key to display the MEASURE menu Press any option key to enter the measure type Select the VOLTAGE MEASURE option key to enter the VOLTAGE MEASURE menu Select the signal input channel according to the SIGNAL SOURCE Select the peak to peak value according to the MEASURE TYPE The corresponding icons and measured values will be displayed in the third option Display of the measurement results on the screen is changed with the change of the measured signal Please regulate Volt div or s div if the reading of the value is displayed as 3 2 Cursor measurement The cursor can be used for quickly measuring the time and voltage of the waveform 3 2 1 Measurement of the width of spike pulse Ca
30. ation Tested keys are in green and the knob region is in red such as 16 in the figure counterclockwise rotation represents clockwise rotation represents and the number represents number of revolution A prompt message of Press RUN STOP key three times to exit is displayed at the bottom of the screen to remind the user to exit the test method u 4 us MUE nn _ Fr pa F off r f on aie r of ES il Pe Figure 2 71 Keyboard test 3 Lightening test Select Lightening test to skip to a lightening test interface as shown in figure 2 72 At the moment the screen displays a prompt message of Press SINGLE key to continue Press RUN STOP key to exit After continuously pressing the SINGLE key the corresponding region on the screen will be in green when the key is lightened RUN and STOP share one key so the key is in green at RUN state and in red at STOP state ai KB _ Y JUDO ET P T iafanneone O a _ na E Tee Teer na a kad m en Press SINGLE ker to continiu Press RUN S Figure 2 72 Lightening test 2 12 5 Upgrading of firmware This series of oscilloscope can upgrade the software by the USB flash disc which needs about 5 minutes The firmware is upgraded by the following steps 1 Plug the USB flash disc in which a firmware program is saved in USB Host interface on the front panel of
31. aveform of signal source 1 Subtract the waveform of signal source 1 from the waveform of signal source 2 Multiply the waveform of signal source 1 with the waveform of signal source 2 Divide the waveform of signal source 1 by the waveform of signal source 2 Divide the waveform of signal source 2 by the waveform of signal source 1 Fast Fourier transform operation Waveform addition of CHland CH2is shown in figure 2 18 Waveform operation Result identification Cle Figure 2 18 MATH Waveform addition FFT Spectral analysis Use FFT Fast Fourier Transform to transform a time domain YT signal into a frequency component frequency spectrum The following types of signals can be observed at FFT mode Analyze harmonic wave in the power cord Measure the harmonic wave component and distortion in the measurement system Analyze the noise characteristics in a DC power supply Test the pulse response of the system Analyze vibration Table 2 8 Page 1 of the function menu FFT FFT Option Signal source Window Horizontal amplification Setup CHI CH2 Hanning Hamming Rectang Blackman 1x 2x 5x 10x Description Select CHlor CH2 as signal source Select window type FFT Change the horizontal amplification factor of FFT result waveform Next Page 1 2 Skip to page 2 of the function menu FFT Table 2 9 Page 2 of the function menu FFT FFT Option Setup Description Vertic
32. c level Setups of channels CH1 and CH2 1 Setups of channel coupling By using CH1 as an example the measured signal is a sine signal with DC offset Press CH1 Coupling AC and set an AC coupling mode The DC component contained in the measured signal will be rejected as shown in figure 2 6 Press CH1 Coupling DC and set a DC coupling mode Both the DC component and the AC component contained in the measured signal can pass through the channel as shown in figure 2 7 M 500ns 0 0s K Coupling M EW Limit BS Limit AC identification _ DC identification Figure 2 6 Set AC Figure 2 7 SetDC Press CH1 Coupling GND and set a GNC mode Both the DC component and the AC component contained in the measured signal are rejected as shown in figure 2 8 Coupling 1 ED EA Limit GND identification Figure 2 8 Set GND 2 Setup of channel bandwidth limit Using Channel CH1 as an example the measured signal is a pulse signal with high frequency oscillation Press CH1 Bandwidth limit On and set the bandwidth limit as ON state The amplitude of the high frequency component higher than 20MHz contained in the measured signal is limited as shown in figure 2 9 Press CH1 Bandwidth limit OFF and set the bandwidth limit as OFF state The amplitude of the high frequency component contained in the measured signal is unlimited as sho
33. cal cleaning reagent Before use after the power on please confirm that the instrument is completely dry so as to prevent short circuit or even personal injury caused by moisture Add Building A8 Tanglang Industrial Zone Xili Nanshan Shenzhen 518055 P R China Tel 86 755 6161 8252 6161 8291 2655 9660 Fax 86 755 6161 8298 e mail atten8 atten com cn http www glarun atten com
34. carries out triggering and records the waveform within a period before and after triggering when burrs appear The POSITION panel is revolved to observe the waveform before appearance of the burrs 3 4 Detailed information analysis of the signal The detailed information of a noise signal is to be known when the noise signal is displayed on the oscilloscope and the signal may contain much information that cannot be observed on the display screen 3 4 1 Observe the noise signal When the signal is displayed as a noise the noise is suspected to cause a problem of the circuit and the following steps can be carried out for analyzing the noise better 1 Press ACQUIRE to display the ACQUIRE menu 2 Press the ACQUIRE MODE key or revolve the UNIVERSAL knob to select PEAK VALUE DETECTION 3 4 2 Separate the signal from the noise Carry out the following steps to reduce random noise in the display screen 1 Press ACQUIRE to display the ACQUIRE menu 2 Press the ACQUIRE MODE option key or revolve the UNIVERSAL knob to select AVERAGE VALUE 3 Press the AVERATE TIME option key to check the influence caused to the waveform by changing the frequency of operating average operation wherein the average operation can reduce the random noise and make the detailed information of the signal be easily checked 3 5 X Y Function application The phase change of the measured signal is displayed as XY afte
35. ce and select FFT 4 Press CurA and revolve the UNIVERSAL knob to move cursor A to the highest position of the FFT spectrum 5 The value of CurA on the screen is the frequency of the highest point of the FFT spectrum and the frequency should be equal to the frequency of the input signal as shown in figure 2 21 A signal with DC component or offset will cause error or offset of an FFT waveform component An AC coupling mode can be selected to reduce DC components DBVrms vertical scale can be used for displaying the FFT waveform within a large dynamic range and this scale displays the vertical amplitude at a logarithm mode Nyquist Function Reconstruction of the waveform needs to adopt a sampling rate that is double of the input frequency 2 5 4 Implementation of REF function During actual measurement the waveform can be compared with the reference waveform so as to judge failure causes This method is particularly applicable at a condition that detailed circuit working point reference waveforms are provided Table 2 11 REF function menu Option Setup Description CH1 Select the waveform for saving Signal source CH2 REF A Select the reference of the saved or recalled REF B waveform SAVE Save the signal source waveform in a selected reference position RUN Display the standard waveform REF A REF B STOP Stop the standard waveform Press REF to display the reference waveform menu as shown in fig
36. ches the limit It prompts that the vertical voltage gear has already reached the lowest gear 2mV div or the highest gear 5mV div and cannot be regulated any more Voltage displacement reaches the limit The system will pop up this prompt message if channel offset is regulated to be too high or too low by revolving the knob VERTICAL POSITION Time base gear reaches the limit The system will prompt this message if the horizontal time base is still regulated after being regulated to the fastest or slowest gear Hold off time reaches the limit The system will prompt this message when the hold off time is regulated to a smallest or largest value by revolving the knob UNIVERSAL Function unavailable The system cannot set some functions at some special modes No signal This message is prompted when the signal does not satisfy the automatic setup condition during automatic setup Setup reaches the limit Regulation cannot be continued if the pulse width reaches the minimal value 20 0ns or the maximal value 10 0s when the knob UNIVERSAL is used to regulate the pulse width Blank storage unit This message appears when the option key CALLOUT is pressed if no waveform or setup is stored at the storage position in waveform storage or setup storage USB storage device is connected successfully This message will appear when the USB flash disc is plugged in a USB Host interface of the oscilloscope USB storage device is disconnected T
37. e osition When pr al position Figure 2 81 Help interface Application examples DIGITAL STORAGE OSCILLOSCOPE This chapter mainly introduces several application examples and these simplified examples importantly illustrate the main functions of the oscilloscope for your reference so as to solve your actual test problems Simple measurement Cursor measurement Single signal catching Detailed information of analysis signal Application of X Y function Application of arithmetical operation function in communication signal analysis u Screen capture 3 1 Simple measurement Observe an unknown signal in the circuit and quickly measure and display the frequency and peak to peak value of the signal 1 Use auto setup Carry out the following steps to display the signal quickly 1 Set the attenuation coefficient as 10X in the probe option by CH1 and set the switch on the probe as x10 2 Connect the probe of channel 1 to a measured point of the circuit 3 Carry out auto setup according to AUTO The oscilloscope will automatically set vertical control horizontal control and trigger control For better observing the waveform you can manually regulate the control on this basis until the control satisfies your requirement 2 Carry out automatic measurement The oscilloscope can be used for automatically measuring most of the display signals and the frequency and peak to peak values of the signal are me
38. e UNIVERSAL knob to select the recalled file 6 Press Recall to recall the setup data from the save position Data is read successfully The setups are successfully recalled and executed Blank save unit File is corrupted Press Back to the waveform display interface if the current USB flash disc has no setup files m The save recall waveform acquisition step is the same as the save recall setup The oscilloscope enters STOP state after the saved waveform is recalled and displayed m Image save As shown in figure 2 61 waveform images can be saved in the USB flash disc but cannot be recalled by the oscilloscope The images are in standard BMP format and can be opened by related software in computer The images are saved in the root directory of the USB flash disc and the file name is defaulted as ASxxxx BMP such as GAS0001 BMP Table 2 41 Image save function menu Option Setup Description Type Image save Save screen image Set the PRINT shortcut key as save function Print button Save image press the PRINT key to save the screen image in the USB flash disc Save Save the screen image in the USB flash disc Save difference of two kinds of images PRINT print button It is a shortcut key and can immediately save the screen image in any menu See the screen capture in application example 3 7 Save It can be used for saving the screen image in a special menu see the menu bar shown in f
39. e revolve the UNIVERSAL knob to top value bottom value select voltage measurement periodic average value average value periodic mean square root mean square root ROVERShoot FOVERShoot RPREShoot FPREShoot parameters types Back Display the icons and measured values corresponding to the selected voltage measurement parameters Back to measurement function menu 1 Table 2 37 Measurement function menu 3 time test menu Option Signal source Types Back Setup CH1 CH2 Rise time fall time frequency period pulse width positive pulse width negative pulse width positive duty ratio negative duty ratio AR p lem a oe a em z Description Select a signal source for time measurement Press Measurement type or revolve the UNIVERSAL knob to select time test parameters Display the icons and the measured values corresponding to the selected measurement parameters Back to the measurement function menu 1 Table 2 38 Measurement function menu 4 delay test menu Option Signal source Types Setup CHI CH2 Phase FRR FRF FFR FFFLRR LRFLFR LFF Description Select a signal source for delay measurement Press Measurement type or revolve the UNIVERSAL knob to select the delay measurement parameters Mm Hl H Lo WY LL SSL F MA I HL_ BLIL an I131 1 Back a A SLL SLL La Display the icons and the measured values corresponding to the
40. egion by two cursors and use the Window setup horizontal POSITION and the knob s div to regulate the window region Expand the window setup region to the whole screen to Window expansion increase the resolution relative to the main time base so that the image details can be conveniently checked 2 6 1 Horizontal control knob The horizontal knob s div changes the horizontal scale time base and the POSITION knob changes the horizontal position triggered displacement triggered in the internal memory The center of the screen in the horizontal direction is a time reference point of the waveform Change of the horizontal scale will cause expansion or contraction of the waveform relative to the center of the screen while the change of the horizontal position is relative to the position of a trigger point Horizontal POSITION knob 1 Regulate the horizontal position trigger the position relative to the center of the display screen of the waveform including MATH The resolution of this control knob is changed according to the time base 2 Use the press down function of this knob to make the horizontal displacement return to zero namely back to the central position of the screen S div knob 1 The knob is used for changing the horizontal time scale so as to conveniently observe the most suitable waveform 2 The knob is used for regulating the main time base When the window expansion mode is adopted the knob
41. electing the trigger type including DC coupling AC coupling HF rejection and LF rejection The functions of all the options are specifically shown in table 2 14 2 7 4 Trigger hold off The trigger hold off function is used for stably displaying complex waveform The hold off time represents a time interval between twice trigger detected by the oscilloscope During the hold off period the oscilloscope performs no trigger As shown in figure 2 36 below regulate the hold off time according to one pulse sequence so that the oscilloscope only triggers at the first pulse in the row Trig Point 4 Trig level Hold off time Figure 2 36 Trigger hold off schematic figure Carry out the following steps to change the hold off time 1 Press TRIG MENU to display the TRIGGER menu 2 Press Type to select the trigger type 3 Press the Setup option to skip to the trigger setup menu 4 Press the Trigger hold off function 5 Regulate the UNIVERSAL knob to change the hold off time until the waveform is stably triggered Using the trigger hold off is conductive to stably display non periodic signals 2 8 Signal acquisition system ACQUIRE is a function key of the signal acquisition system Cursor Signal acquisition Save Measure Display Auxiliary Figure 2 37 Menu keys Default setup Table 2 28 function keys of the signal acquisition system Option Acquisition mode Interpolatio
42. ernating trigger is selected the trigger signal comes from two channels The mode is used for simultaneously observing two unrelated signals Two different trigger types edge pulse video and slope can be selected for the signals from the two channels During setup the trigger types of the two channels and the trigger electric level information are respectively displayed in the right lower corner of the screen The setups of the four trigger types are seen in 2 7 2 H 2005 Figure 2 35 Alternating trigger Operation description As shown in figure 2 35 the following steps can be carried out for simultaneously observing unrelated signals in two channels 1 Access two unrelated signals to channel 1 and channel 2 2 Press AUTO 3 Press TRIG MENU to skip to TRIGGER menu 4 Select the trigger Type as Alternation 5 Select the Signal source as CH1 6 Press Trigger mode to select Edge Pulse Slope or Video 7 Perform setup to realize stable trigger 8 Select the Signal source as CH2 9 Repeat step 6 press Trigger mode to select Edge Pulse or Video 10 Repeat step 7 2 7 3 Coupling The Coupling option is used to determine which part of signal passes through the trigger circuit It is conductive to stably display the waveform Press TRIG MENU to use trigger coupling Select the Coupling option in the Setup menu after s
43. g signal Reject DC components and attenuate the signals lower than 50Hz Attenuate high frequency components higher than 150kHz Reject DC components and attenuate low frequency components lower than 7kHz Use the UNIVERSAL knob to regulate the hold off time Reset the trigger hold off time to be the minimal AC Coupling High frequenc y rejection Low frequency rejection Trigger hold off Reset Back value 100ns Back to the homepage of the trigger menu Operation steps Set the types 1 Press TRIG MENU to display the TRIGGER menu 2 Press Type to select Edge trigger Set the signal sources 3 Press Signal source to select CH1 CH2 EXT EXT 5 or AC Line according to the signal input Set the slopes 4 Press Slope to select Rise edge Fall edge or Rise and fall edge Set the trigger modes 5 Press Trigger mode to select Auto Normal or Single Auto Refresh the waveform no matter whether the waveform satisfies the trigger condition Normal Refresh the waveform when the waveform satisfies the trigger condition otherwise do not refresh the waveform and wait for occurrence of the next trigger event Single Acquire the waveform once when the waveform satisfies the trigger condition and then stop Set the trigger coupling 6 a Press Setup to skip to the trigger setup menu b Press Coup
44. he horizontal and vertical coordinates of the current located point and the horizontal and vertical increments between the two cursors are displayed The horizontal coordinate is displayed as a time value and the vertical coordinate is displayed as a voltage value as shown in figure 2 53 The operation steps are as follows 1 Press CURSORS to skip to the CURSOR menu 2 Select Cursor mode as Tracking 3 Press Cursor A and select the input channel CH1 or CH2 of the tracked signal 4 Press Cursor B and select the input channel CH1 or CH2 of the tracked signal 5 Select Cur A and rotate the UNIVERSAL knob to horizontally move cursor A 6 Select Cur B and rotate the UNIVERSAL knob to horizontally move cursor B 7 Display the measured values on the left upper corner of the screen A gt T Position namely the time based on the horizontal central position of cursor A in the horizontal direction A V Position namely the voltage based on the grounded point of the channel of cursor A in the vertical direction B T Position namely the time based on the horizontal central position of cursor B in the horizontal direction B V Position namely the voltage based on the grounded point of the channel of cursor B in the vertical direction Delta T Horizontal distance namely the time value between the two cursors of cursor A and cursor B 1 Delta T Frequency of c
45. he product The following terms may appear on the product Danger It represents that harms may be caused to you at once if you perform the operation Warning It represents that latent harms may be caused to you if you perform the operation Notice It represents the damage possibly caused to the product or other properties if you perform the operation Characters on the product The following characters may appear on the product A ome Notice Please read the manual Protective Measuring Chassis ground terminal ground terminal ground terminal Introduction to GA1000 series of digital storage oscilloscope GA1000 oscilloscope has a real time sampling rate as high as 2GSa s therefore it is capable of catching complex and quickly changing signals It supports storage of USB equipment and is capable of updating and upgrading the system software by a USB flash disc GA1000 series of digital storage oscilloscope is small in size and flexible to operate It adopts a TFT LCD and a pop up menu for display and can remarkably improve the working efficiency by its ease of use GA1000 series of oscilloscope has excellent performance various functions and competitive cost to performance ratio Model Bandwidth Sampling Rate GA1102CAL 100MHz 1GSa s GA1202CAL 200MHz 2GSa s GA1302CAL 300MHz 2GSa s Characteristics The oscilloscope has a totally new ultrathin appearance design and is small in size and more portable A 7
46. he third option key as shown in figure 2 55 Betum Figure 2 55 Specific item measurement Figure 2 56 All measurement 6 When get back to the measurement result region in the homepage the selected parameters and the corresponding values will be displayed in the first option Other option measurement types can be changed by the same method and the homepage can display five parameters every time The voltage parameters can be measured by using the all measurement function by the following steps 1 Press MEASURE to skip to the MEASURE menu 2 Press any option key in the homepage to skip to the measurement function menu 1 3 Select All measurement 4 Press Signal source to select the signal input channel 5 Press Voltage test to select Run At the moment all the voltage parameter values will be simultaneously displayed on the screen As shown in figure 2 56 2 11 Storage system SAVE RECALL is a save recall function key Table 2 41 Save type description Type Setup save Waveform save Image save CSV Factory setups Description 20 groups of setups can be saved in a format of SET 16 groups of waveforms can be saved in a format of DAV The waveform data can be recalled to the current oscilloscope or the same series of oscilloscope It is equivalent to screen capture and the format is BMP It is only saved in a USB flash disc and opened by computer software The format
47. his message will appear when the USB flash disc is unplugged Data is stored successfully It means that the setup data waveform data and image data are already stored in the oscilloscope or the USB flash disc Data is read successfully It means that the setup data or the waveform data is successfully called out from the oscilloscope or the USB flash disc USB storage device is unconnected This message will be prompted if the USB flash disc is not plugged for storage when the option store to is set as USB flash disc or the option PRINT BUTTON is set as stored image in the menu SAVE RECALL Waveform recording is finished The system will prompt this message when waveform recording is ended 4 2 Fault treatment 1 If the screen of the oscilloscope is still black and does not have any display after the power switch is pressed please follow the steps below 1 Check whether the power plug is rightly connected 2 Check whether the power switch is really pressed down 3 Reboot the instrument after finishing the inspection above 4 Please contact Gratten if the product still cannot be used properly 2 Treat the fault according to the following steps if the waveform of the signal does not appear in the picture after the signal is acquired 1 Check whether the probe is normally connected to the signal connecting wire 2 Check whether the signal connecting wire is normally connected to the BNC
48. igger function menu Option Type Signal source Slope Trigger modes Setup Setup Edge CHI CH2 EXT EXT 5 AC Line Rise edge Fall edge Rise and fall edge Auto Normal Single Description Edge trigger happens when a trigger input signal crosses the trigger electric level at a rise edge or a fall edge Triggers on a channel whether or not the waveform is displayed Does not display the trigger signal the Ext option uses the signal connected to the EXT TRIG front panel BNC and allows a trigger level range of 12V to 12V Same as Ext option but attenuates the signal by a factor of five and allows a trigger level range of 6V to 6V This extends the trigger level range This selection uses a signal derived from the power line as the trigger source trigger coupling is set to DC and the trigger level to O volts Trigger the signal at the rising edge Trigger the signal at the falling edge Trigger the signal at the rising edge and the falling edge Automatic trigger can be implemented to finish acquisition at the mode when no valid trigger exists Only valid triggered waveform is checked at the mode The waveform is acquired only when satisfying the trigger condition Acquire a waveform when detecting a single trigger and then stop Skip to the trigger setup menu Table 2 14 Trigger setup function menu Option Setup Description DC All the components of a passin
49. ight upper corner of the screen during movement The operation steps are as follows 1 Press CURSORS to skip to the CURSOR menu 2 Select Cursor mode as manual 3 Press Type to select Voltage or Time 4 Press Signal source to select CH1 CH2 MATH REF A or REF B according to the signal input channel 5 Select Cur A and revolve the UNIVERSAL knob to regulate the position of cursor A 6 Select Cur B and revolve the UNIVERSAL knob to regulate the position of cursor B 7 Display the measured values on the left upper corner of the screen Figure 2 50 Cursor manual mode Figure 2 51 Cursor tracking mode Cursor tracking measurement mode Table 2 33 Cursor tracking function menu Option Setup Description Cursor mode Tracking Set the tracking cursor measurement CHI Set an input channel for cursor A to measure N CH the signal by tracking measurement No cursor Set an input channel for cursor B to measure Cursor B the signal by tracking measurement Select the option using the UNIVERSAL knob Cur A to regulate the horizontal coordinate of cursor A Select the option using the UNIVERSAL knob Cur B to regulate the horizontal coordinate of cursor B At cursor tracking measurement mode the cross cursors are displayed on the measured waveform the cursors are automatically located on the waveform by moving the horizontal position between the cursors and simultaneously t
50. ignal difference analys cp ee er ae IT SEIEEN Caplurer alt dehideheteiisstn OO Chapter 4 System prompt and Fault Recovery 9 1 4 1 System prompt message description 1 4 2 EaulE Treatment einen Wem I Chapter 5 Service and Support ID 5 1 Maintain S mmani rim 0 Chapter 6 Appendix 22 52 48 sense OO Appendix A Technical SpecifiCation ccccceccss sss cssseesse conse cesses coseecssssecessstseees JO Appendix B Default Setting cesses csssssesssscssesssessssonssssessessaessssssssssssssssssasees LOI Appendix C Daily maintenance and cleaning ueemeneneeenenenneeeen 105 Introduction DIGITAL STORAGE OSCILLOSCOPE This series of digital storage oscilloscope is a small and light portable instrument that can be measured by a ground voltage as reference This chapter introduces how to implement the following tasks Accidence of front panel and user interface Implement brief function checks Match probe attenuation coefficients Implement probe compensation 1 1 Accidence of front panel and the user interface This section will make you understand the front operation panel of this series of digital oscilloscope at first before use The content below simply describes and introduces the front panel and the back part of this series of digital oscilloscope so that you can know this series of digital oscilloscope well within the shortest time 1 1 1 Front panel
51. igure 2 61 Type 4 Picture Print Kes Figure 2 61 Image save Figure 2 62 CSV save m CSV save Table 2 42 CSV save function menu Option Setup Description Screen The CSV file is used for saving the waveform data displayed on the screen Internal memory The CSV file is used for saving the waveform data of the internal memory Data length m Run Set whether to save the corresponding Save Save the interface As shown in figure 2 62 the following steps can be carried out to save the CSV file in the USB flash disc 1 Press SAVE RECALL to skip to the SAVE RECALL menu 2 Press Type to select CSV 3 Plug the USB flash disc and prompt USB save equipment is connected successfully after the connection is normal 4 Press Data length to select Screen or Internal memory 5 Press Parameter save to select Stop or Run 6 Press the Save option to save the CSV The data is saved in the root directory of the USB flash disc and the file name is defaulted as GASxxxx CSV such as GAS0001 CSV The CSV file can be opened by EXCEL software in a computer Restore the factory setups When the save type is set as factory setup press the Recall key to restore the factory setups The shortcut key is DEFAULT SETUP 2 12 Auxiliary system UTILITY is an auxiliary system function key Table 2 43 Page 1 of auxiliary system function menu Option Setup Descr
52. inch widescreen color TFT LCD displays clear crisp and more stable waveform display Storage Memory depth single channel 40Kpts double channels 20Kpts Various trigger functions Edge Pulse Video Slope and Alternation Unique digital filtering and waveform recording functions 4 Pass Fail function 9 9 32 kinds of automatic measurement and manual cursor tracking measurement functions Two groups of reference waveforms 16 groups of common waveforms 20 groups of internal storage output support waveform setting external storage and output of CSV and bitmap file by USB flash disc CSV and bitmaps cannot be output from USB flash disc Adjustable waveform brightness and screen grid brightness The pop up menu display mode realizes more flexible and more natural for users operations Various kinds of language interface display Chinese and English On line help system Shortcut key PRINT support print screen Standard configuration interfaces USB Host USB Device RS 232 USB Host support storage of USB flash disc and upgrading of USB flash disc system software USB Device support PC connection for remote communication GA1000 series of digital storage oscilloscope accessories 9 9 4 User s manual Product warranty card Certificate of approval 1 1 10 1 probes 2 PCS ea Power cord satisfying the standard of the user s country USB cable Optical disc containing PC software GAScope1
53. ing measurement results will be displayed on the display screen e Voltage increment peak to peak value of the spike pulse Delta V e Voltage at cursor A e Voltage at cursor B 3 3 Catch the single signal For catching a single signal you need to understand the signal to a certain extent at first otherwise observe the signal at first at an automatic trigger mode or at a normal trigger mode so as to determine a suitable trigger electric level and a trigger edge The operation steps are as follows 1 Set the attenuation coefficient as 10x in the probe option and set the switch on the probe as x 10 2 Carry out trigger setup 1 Press TRIG MENU to display the TRIGGER menu 2 Respectively set the type as EDGE TRIGGER set the signal source as CH1 set the slope as RISE EDGE set the trigger mode as ONCE and set the coupling as DIRECT CURRENT 3 Regulate the horizontal time base and the vertical gear to a suitable range 4 Revolve LEVEL to regulate a suitable trigger electric level 5 Press RUN STOP to wait appearance of a signal satisfying the trigger condition acquire the signal once and display the signal on the screen By this function occasional events can be easily caught such as sudden burrs with large amplitude the trigger electric level is set to be an electric level that is a little larger than a normal signal the key RUN STOP is pressed to wait and the machine automatically
54. iption System state Display the system state of the oscilloscope Sound Q Run the key sound of the oscilloscope 9x Stop the key sound of the oscilloscope Frequency meter Run Run the frequency meter function Stop Stop the frequency meter function Language Simplified Chinese Simplified Chinese English English Next Page 1 4 Press the option key to skip to page 2 of the menu Figure 2 63 Page 1 of auxiliary Figure 2 64Page 2 of auxiliary function menu function menu Table 2 44 Page 2 of the auxiliary system function menu Option Setup Description Carry out self correction operation for Self correction channel correction Screen test Run a screen test program Self test Keyboard test Run a keyboard test program Lightening test Run a lightening test program Connect the oscilloscope with the computer by a USB wire and select Computer when Back USB running the principle computer GAScopel 0 Computer interface software to implement remote control and display a computer icon in the upper part of the screen at the moment Next Page 2 4 Press the key to skip to page 3 of the menu Table 2 45 Page 3 of the auxiliary system function menu Option Setup Description Upgrade the software by the USB flash Upgrade disc The upgrading needs about 5 firmware minutes Press the key to skip to the Pass Fail Pass Fail menu Waveform Press the key to skip to the waveform recording recording menu Interface setup S
55. is CSV It is only saved in a USB flash disc and opened by computer EXCEL software The factory setups are inherent in the oscilloscope when the oscilloscope leaves factory and are recalled only Waveform save It is waveform data displayed on an interface and can be identified by the oscilloscope The saved image is the whole screen image including waveform menu and the like The CSV saves the original data points of the waveform Save recall setup m Save types The save types include setup save waveform save image save CSV and factory setups wherein the setups and waveforms can be saved and then recalled the images and CSV are saved only and the factory setups are recalled only arm oo aTa Setups SAVE REC M 00iig Waveforms Type ki Picture Setups CSV Factory Figure 2 57 Save type Figure 2 58 Save to equipment m Save the setups in equipment As shown in figure 2 58 the setups are saved in equipment the equipment is the oscilloscope and 20 groups of data NO 1 NO 20 can be saved The save steps are as follows 1 Press SAVE RECALL to skip to the SAVE RECALL display menu 2 Press Type to select Setup save 3 Press Save to to select Equipment 4 Press Equipment to select NO 1 save position 5 Press Save to save the current setups in equipment NO 1 Prompt Data is saved successfully after storage is ended m Recall the setups from the e
56. is used for changing the expansion time base so as to change the window width Display Scan mode When the time base is set to be 100ms div or more slowly and the trigger mode is set to Auto the oscilloscope enters the scan mode At this mode waveform display is renewed from left to right At the mode no waveform trigger or horizontal position control exist The channel coupling should be set as direct current when a low frequency signal is observed at the scan mode 2 6 2 Window expansion Window expansion is used for amplifying a segment of waveform so as to check details The window expansion time base setup cannot be slower than the setup of the main time base In the window expansion region a selection region can be moved leftwards and rightwards by the horizontal POSITION knob or enlarged and reduced by revolving the s div knob The window expansion time base has higher resolution relative to the main time base The smaller the window expansion time base is the higher the horizontal expansion multiple of the waveform is Carry out the following steps to observe details of local waveform 1 Press HORI MENU to display the HORIZEN menu 2 Press the WinZone option button 3 Revolve s div to regulate the size of the window and the horizontal POSITION to regulate the position of the window to select the window of the waveform to be observed as shown in figure 2 26 The expansion time base cannot be
57. isplay ARITHMETICAL OPERATION function menu REF display REFERENCE WAVEFORM menu HORI MENU display HORIZONTAL menu TRIG MENU display TRIGGERE control menu SET TO 50 set the trigger electric level as midpoint of the signal amplitude FORCE It is used for finishing acquisition of the current waveform no matter whether the oscilloscope detects trigger and it is mainly applied to NORMAL and SINGLE in the trigger mode SAVE RECALL display the SAVE RECALL menu of setups and waveform ACQUIRE display the ACQUIRE menu MEASURE display the MEASURE menu CURSORS display the CURSOR menu The UNIVERSAL knob can be used for regulating the position of the cursor when the CURSOR menu is displayed and the cursor is triggered DISPLAY display the DISPLAY menu UTILITY display AUXILIARY FUNCTION menu DEFAULT SETUP recall the default factory setup HELP enter the on line help system AUTO automatically set the control state of the oscilloscope so as to display suitable waveform RUN STOP continuously acquire waveform or stop acquisition SINGLE Acquire a single trigger finish acquisition and then stop 2 2 Connector Figure 2 2 Connector a CH1 CH2 for an input connector of a measured signal u EXT TRIG be used as an input connector of an external trigger source Use TRIG MENU to select EXT or EXT 5 trigger source
58. ke 1 2 3 This appearance is normal The horizontal time base gear may be too low and the display can be improved by increasing the horizontal time base to increase the horizontal resolution The display type may be VECTOR and the linked line between the sampling points may cause ladder like display of the waveform This problem can be solved by setup the display type as POINT display mode Service and Support DIGITAL STORAGE OSCILLOSCOPE This chapter mainly introduces the related information of the service and support of the oscilloscope product 5 1 Maintain summary Gratten warrants that the products that it manufactures and sells will have no material and technical defects within two years accessories within one year since the delivery date of the authorized distributor If the products indeed have defects within the guarantee time Gratten will provide repair or replace services according to detailed provision on the warranty bill Please contact the nearest sales and service agency of Gratten if needing services or requesting a complete copy of the warranty bill Except the warranties in the summary or provided in an applicable warranty bill Gratten makes no warranty of any kind express or implied including without limitation the implied warranties according to merchantability and particular applicability Gratten assumes no responsibility for any indirect and special damage inflicted on pu
59. kip to an interface setup menu Press the option key to skip to the next Next Page 3 4 page of the menu Figure 2 65 Page 3 of the auxiliary menu Figure 2 66 Page 4 of the auxiliary menu Table 2 46 Page 4 of the auxiliary system function menu Option Setup Description Tmin 2min 5min 10min Screen saving a Set the screen saving time 20min 1hour 2hour 5hour Stop Next Page 4 4 Press the option key to skip to page 1 2 12 1 System state Select System state in the UTILITY menu to display the system state As shown in figure 2 67 the system state includes software and hardware versions local model number and sequence number System Infomation Software Version 1 00 Hardware Version 1 00 Product Type GA1102CAL Serial NO 111020N1301010031 Press SINGLE key to exit Figure 2 67 System state Figure 2 68 Language selection English 2 12 2 Language selection This series of oscilloscope is provided with a plurality of languages that can be selected by users To select a display language press UTILITY press Language type in page 1 of the UTILITY menu and switch the language menu for display Figure 2 68 shows an English menu 2 12 3 Self correction A self correction program can ensure a maximal measurement precision of the oscilloscope The program can be run at any time especially when the environment temperature is changed by more than 5 DEG C or after the program is continuously run
60. l Type Signal source Condition Pulse width setup Trigger mode Coupling Type Signal source Polarity Synchro Standard Trigger mode Type Signal source Condition OFF OFF Baud rate 300 Edge CHI Rise Auto Direct current 0 00mV Pulse Auto Direct current Video CHI All rows NTSC Auto Slope CHI Eig TRIGGER ALTERNATION Time setup Trigger mode Type Signal source Trigger mode Coupling Slope 20 00ns Auto Alternation CHI Edge Direct current Rise edge Appendix C Daily maintenance and cleaning Daily maintenance Do not let the liquid crystal displayer be suffered from direct irradiation of sunshine when storing or placing It Attention Do not place the instrument or probe in fog liquid or solvent for avoiding damage of the instrument or probe Cleaning Usually check the instrument and the probe according to operation condition and clean the external surface of the instrument according to the following steps 1 Use a soft rag to wipe surface dust outside the instrument and the probe and do not scratch the transparent plastic protective screen when cleaning the liquid crystal displayer 2 Use a wet soft cloth to clean the instrument and please cut off the power supply For more complete cleaning please use a hydro solvent of 75 of isopropanol To avoid damage of the surface of the instrument of probe please do not use any corrosive reagent or chemi
61. ling option key to select DC AC HF rejection or LF rejection Type 4 Edge Source Mi Slope 4 LpEdge Mode Auto Figure 2 29 Edge trigger Figure 2 30 Pulse trigger 2 Pulse trigger Set certain conditions to catch abnormal pulses as shown in figure 2 30 Table 2 15 Page 1 of the pulse trigger function menu Option Type Signal source Condition Pulse width setup Setup Pulse CHI CH2 EXT fo Positive pulse width gt F4 Positive pulse width lt fe Positive pulse width bt Negative pulse width gt imal Negative pulse width lt HI Negative pulse width 20 0ns 10 0s Description Trigger the pulse satisfying the condition when selecting pulse See the signal source shown in 2 7 1 Condition for triggering the pulse relative to Pulse width setup value Select the options to use the UNIVERSAL knob to set the pulse width Skip to page 2 of the pulse trigger Next Page 1 2 function menu Table 2 16 Page 2 of the pulse trigger function menu Option Setup Description Trigger the pulse satisfying the condition when Type PURE selecting pulse Auto See table 2 13 The Normal mode is most Trigger mode Normal applicable to application of most of the Pulse Single width trigger Setup Skip to the trigger setup menu See table 2 14 Back Back to page 1 of the pulse trigger menu Operation description Set the type 1 Press TRIG MENU to
62. main body can prevent fingers from electric shock Probe protective device Figure 1 6 Probe Connect the probe to the oscilloscope and ground the ground terminal before any measurement Attention Keep fingers behind the protective curve on the probe main body to prevent electric shock when using the probe e Do not contact the metal part on the top of the probe when the probe is connected to a voltage source The signal measured by the oscilloscope uses ground as reference voltage and the ground terminal should be grounded correctly to prevent short circuit 1 3 2 Probe attenuation setting The probe has different attenuation coefficients that influence the vertical scale of the signal The ATTENUATION switch on the probe is ensured to be matched with the PROBE coefficients in the oscilloscope Manually set the probe options press down the vertical menu key and then select the PROBE option such as CH1 PROBE Default setup of the probe optical is 1X e When the ATTENUATION switch is set as x1 the probe limits the bandwidth of the oscilloscope within 0 10 MHz different probes have different specifications Ensure that the switch is set to be x10when to use the full bandwidth of the oscilloscope 1 3 3 Probe compensation Carry out probe compensation when the probe connect the channel for the first time so as to match the probe with the channel Under compensation or
63. n type Sampling mode Sampling rate Setup Sampling Peak value detection Average value Average time 4 16 32 64 128 256 Sine Linear Real time sampling Description For acquiring and accurately displaying waveform For detecting burrs and reducing Fake wave phenomenon For reducing random or unrelated noise in signal display Select average time Enable sine interpolation Enable linear interpolation Set the sampling mode as real time sampling Display the sampling rate of the system Sampling The oscilloscope samples the signal at uniform time intervals to form a waveform Advantage Signals can be accurately shown at the mode in many cases Shortcoming Quickly changing signals possibly generated between sampling points cannot be acquired at the mode which may cause fake wave phenomenon and may miss spike pulses so peak value detection mode should be adopted under these conditions Aust Peak Det f 5 00004kHz f 5 00005kHz CHI 100mV CHI f 88 Om DB Figure 2 38 Sampling mode Figure 2 39 Peak value detection mode Peak value detection The oscilloscope finds out the maximal value and the minimal value of the input signal in each sampling interval and uses these values to display the waveform Advantage spike pulses that may be missed can be acquired and displayed and signal confusion can be avoided at the mode Shortcoming Loud noise is displayed a
64. n example when a probe 100 1 is used Press CH1 Probe 100X as shown in figure 2 13 Coupling 1 B Limit Probe coefficient Vertical gear change Figure 2 13 Probe 100X 5 Waveform inverse setup Use channel CH1 as an example Press CH1 Inverse gt OFF as shown in figure 2 14 Press CH1 Inverse ON and reverse the displayed signal by 180 degrees relative to zero electric level as reference as shown in figure 2 15 Figure 2 14 Inverse OFF Figure 2 15 Inverse ON 6 Digital filter setup Press CH1 Next Digital filter and display digital filter function menu FILTER select Filter type then select Frequency upper limit or frequency lower limit and revolve the UNIVERSAL knob to set the frequency upper limit and frequency lower limit Press CH1 Next Digital filter OFF and close the digital filter function as shown in figure 2 16 Press CH1 Next Digital filter ON and open digital filter function as shown in figure 2 17 Figure 2 16 Digital filter OFF Figure 2 17 Digital filter ON 2 5 2 Application of POSITION knob and Volt div knob of the vertical system Vertical POSITION knob 1 The knob is used for regulating vertical offset of the waveform of the channel in where the knob is The resolution is changed according to the vertical gear 2 The knob can be pressed to return
65. ncy ratio K represents a phase difference coefficient and theta K x pi 4 Figure 2 49 is a measured Lissajous pattern when the two signals have the same frequency and amplitude and the phase difference is pi 2 eo JONNI IEPES LA SRE SESS Figure 3 4 Special Lissajous pattern a a gt vi 3 6 Application of arithmetical operation in communication signal analysis Interruption of a certain serial data communication link may be caused by poor signal quality An oscilloscope is set to display the transient state of serial data stream so as to check the electric level and the jump time of the signal It is a difference signal and the waveform can be displayed better by using the arithmetical function of the oscilloscope The following steps can be carried out by activating the difference signal connected to channel 1 and channel 2 1 Press CH1 to set the attenuation of the PROBE option as 10x 2 Press CH2 to set the attenuation of the PROBE option as 10x 3 Set the switch on the probe as x10 4 Press AUTO 5 Press MATH to display the MATH menu 6 Set OPERATION as 7 Select CH1 CH2 and represent the difference of the waveforms of channel 1 and channel 2 by the arithmetical operation results 8 Press the fourth and fifth function options to regulate the vertical scale and position of the arithmetical operation waveform e Two probes should be compensated at firs
66. pe has acquired all the pre triggering data and is ready to accept a trigger Trig d The oscilloscope has caught a single trigger and acquires the data after triggering Stop The oscilloscope has stopped acquiring waveform data Auto The oscilloscope is at an auto mode and acquires the waveform at a non triggered state Scan The oscilloscope continuously acquires and displays the waveform at a scan mode e 8 8 8 8 The reading displays the setup of a main time base It displays a time reading from the central scale The identifier displays the horizontal trigger position The horizontal POSITION knob is used for regulating the horizontal trigger position EZ It represents the oscilloscope is connected to a computer The identifier displays a zero electrical level standard point of the channel waveform The identifier is displayed only when the channel is open The identifier displays a trigger electrical level The identifier displays bandwidth limit of the channel The identifier displays coupling mode of the channel The reading displays vertical scale coefficient of the channel The identifier displays inverse phase of waveform of the channel The reading displays counting frequency of a frequency meter It displays a trigger source selected at present The icon displays a selected trigger type The reading displays a set trigger electrical level value 1 1 2 Instrument back This serie
67. pectrum Measure two items of the FFT spectrum amplitude and frequency The cursor measurement takes 2 11 2 for reference Use the horizontal cursor to measure the amplitude and use the vertical cursor to measure the frequency 1 Measure FFT spectrum amplitude and use CH2 as an example the operation is as follows 1 Input a sine signal to CH2 and press AUTO 2 Press MATH and skip to menu MATH 3 Press Operation and select FFT 4 Press Signal source and select CH2 5 revolve s div to regulate the sampling rate larger than double of the input frequency 6 Press CURSORS and skip to menu CURSOR 7 Press Cursor mode and select manual 8 Press Type and select Voltage 9 Press Signal source and select MATH 10 Press CurA and revolve the UNIVERSAL knob to move cursor A to the lowest point of the FFT waveform 11 Press CurB and revolve the UNIVERSAL knob to move cursor B to the highest point of the FFT waveform 12 The value of Delta V on the screen is the amplitude of the FFT waveform as shown in figure 2 20 Figure 2 20 Cursor measurement Figure 2 21 Cursor measurement of spectrum amplitude of spectrum frequency 2 Measure the FFT spectrum frequency by the following steps 1 Repeat previous steps 1 7 for measuring the spectrum amplitude 2 Press Type and select Frequency 3 Press Signal sour
68. quipment 1 Press SAVE RECALL to skip to the SAVE RECALL display menu 2 Press Type to select Setup save 3 Press Save to to select Equipment 4 Press Equipment to select NO 1 save position 5 Press Recall to recall the setup data from the save position Data is read successfully The setups are successfully recalled and executed Blank save unit The current save position has no setup data m Save the setups in a USB flash disc Figure 2 59 Save setups in Figure 2 60 Recall setups from USB flash disc USB flash disc Save the setups in a USB flash disc 1 Press SAVE RECALL and select the Setup save type as shown in figure 2 59 2 Plug the USB flash disc and prompt USB save equipment is connected successfully after the connection is normal 3 Press Save to to select USB flash disc 4 Press the Save option to save the setups The data is saved in root directory of the USB flash disc and the file name is defaulted as GASxxxx SET such as GAS0001 SET Recall the setups from the USB flash disc 1 Press SAVE RECALL and select the Setup save type as shown in figure 2 60 2 Plug the USB flash disc and prompt USB save equipment is connected successfully after the connection is normal 3 Press Save to to select USB flash disc 4 Press Recall to skip to a USB flash disc file interface as shown in figure 2 60 5 Use th
69. r the signal passes through a certain electric network and the following steps are carried out 1 Press CH1 to set the probe option as 10x 2 Press CH2 to set the probe option attenuation as 10x 3 Set the switches on both probes as x10 4 Connect the probe of channel 1 to an input point of the network and connect the probe of channel 2 to an output point of the network 5 Press AUTO 6 Revolve Volt div to make that the signal amplitudes displayed on the two channels are roughly the same 7 Press DISPLAY and select XY in a format option A Lissajous pattern is displayed on the screen to represent input and output characteristics of the circuit 8 Revolve Volt div and the vertical POSITION so as to optimize the display 9 Observe and calculate the phase difference by an elliptical oscillography graphical method Shown in the figure below je The signal should be horizontally centered Figure 3 3 The phase difference angle theta is equal to arcsin A B or theta is equal to arcsin C D according to the formula sin theta A B or C D wherein theta represents the phase difference angle between the channels and A B C and D are defined in the figure above The two signals have the same amplitude if the frequency or phase difference of the two measured signals is integer multiples of pi 4 The Lissajous pattern of the special signals is shown in figure 3 4 wherein m n is a freque
70. rigger position 2 groups of reference waveform 20 groups of common waveform 16 groups of setups save and recall from USB flash drive of the waveform setups CSV and bitmap files CSV and the bitmaps cannot be recalled from the USB flash disc are supported Hardware frequency counter Reading resolution ratio Range Signal source General specifications Display system Display type Display resolution ratio Display color 6 bits Alternating current coupling from 10Hz to the maximal bandwidth All sources capable of being triggered in pulse trigger or edge trigger type TFT 7 inch 178mm LCD 800 horizontal pixels x 480 vertical pixels 64k color Contrast ratio typical Background intensity typical Waveform display range Afterglow Menu display Screen saver Interpolation mode Screen color mode Display language Power supply Power voltage AC power supply frequency range Consumed power Environment Temperature Cooling Humidity Height Mechanical specifications Size Weight 500 1 300 Cd m 14 x 8 grids Off 1 second 2 seconds 5 seconds infinite 2 seconds 5 seconds 10 seconds 20 seconds infinite Off Imin 2min 5min 10min 15min 20min 1h 2h 5h Sine interpolation linear interpolation Normal inverse phase Simplified Chinese English 100 240 VAC CAT II auto selection 45Hz to 440Hz 5OVA Max Operating 10 C to 40 C Non operating 20 C to
71. rm m Time base Use the s div knob to regulate the time base The time base is a quantization unit of the time namely the time represented by a large horizontal grid this series of oscilloscope has 14 horizontal grids in total of the oscilloscope The time base is closely related with the sampling rate The larger the time base is and the smaller the sampling rate is m Fake wave phenomenon Fake wave phenomenon will appear if the oscilloscope does not sample the signal quickly enough and does not make accurate waveform recording as shown in figure 2 42 To eliminate this type of phenomenon switch to a quick time base gear or adopt the peak value detection mode Displayed low frequecy illusive wave Sampled point Figure 2 42 Select a suitable interpolation function At a small time base gear 50ns div or smaller there are few original sampling points in one period and the displayed waveform has bad quality so an interpolation function is adopted to increase sampling point and rebuild the waveform so that the measurement precision is improved Sine interpolation is suitable for sine while linear interpolation is suitable for triangular wave square wave and similar AS shown in figure 2 43 below after sine interpolation the displayed waveform is good while figure 2 44 shows the waveform after linear interpolation of a sine signal absolutely the waveform is bad and the interpolation function is not
72. rpose Appendix DIGITAL STORAGE OSCILLOSCOPE This chapter introduces the technical specifications and default settings of the GA1000 series of oscilloscope Appendix A Technical specifications All technical specifications are applicable to probes of which the attenuation switches are set as x10 and this series of digital oscilloscope To check whether the oscilloscope satisfies the technical specifications the oscilloscope should satisfy the following conditions at first The oscilloscope should run for at least 30min within a specified operation temperature range SELF CORRECTION should be implemented if the change range of the operation range is 5 DEG C or higher and this operation can be carried out by the AUXILIARY FUNCTION menu All the specifications are ensured to satisfy the requirement except that marked with TYPICAL sign Technical specifications Input Input coupling Input impedance Maximum input voltage Probe attenuation Signal acquisition system Sampling mode Sampling rate Storage depth Acquire mode Average time AC DC GND 1MO 3 16pF 3pF 500 2 GA1302CAL 400V DC AC peak value 1MQ input impedance 1X 10X 100X 1000X Real time sampling Single channel 2GSa s dual channel 1GSa s Only to GA1302CAL GA1202CAL Single channel 1GSa s dual channel 500MSa s only to GA1102CAL Single channel 40kpts Dual channel 20kpts Sampling peak
73. rry out the following steps to measure the width of a spike pulse of a certain signal 1 Press CURSORS to display the CURSOR menu 2 Select CURSOR MODE as MANUAL 3 Press the option TYPE key and select TIME 4 Press the SIGNAL SOURCE option key and select CH1 5 Press the CurA option key and revolve the UNIVERSAL knob to place the cursor A at an edge of the spike pulse 6 Press the CurB option key and revolve the UNIVERSAL knob to place the cursor B at an edge that is clearest to the spike pulse As shown in figure 3 1 time increment Delta T and frequency increment 1 Delta T measured the width of spike pulse will be displayed in the left upper corner of the display screen Figure 3 1 Width measurement Figure 3 2 Amplitude measurement of spike pulse of spike pulse 3 2 2 Amplitude measurement of spike pulse Carry out the following steps to measure the amplitude of the spike pulse 1 Press CURSORS to display CURSOR 2 Select CURSOR MODE as MAUNAL 3 Press the TYPE option key and select TIME 4 Press the SIGNAL SOURCE option key and select CH1 5 Press the CurA option key and revolve the UNIVERSAL knob to place the cursor A at the highest wave peak of the spike pulse 6 Press the CurB option key and revolve the UNIVERSAL knob to place the cursor B at the lowest point of the spike pulse As shown in figure 3 2 the follow
74. s of digital oscilloscope provides various standard interfaces as shown in the figure below A WARNING 1 Pass Fail output port output a Pass Fail detection pulse 2 RS 232 interface connect test software or waveform printing a bit slow 3 USB Device interface connect test software or waveform printing quick 4 Power input interface input a three hole power supply 1 2 Function check Carry out a quick function check to check whether the oscilloscope works normally according to the following steps 1 Turn on the power source and set the default attenuation as 1x according to the probe option DEFAULT setup 2 Set a switch on a probe of the oscilloscope as x1 and connect the probe with a connector CH1BNC of the oscilloscope Connect a hook shaped head of the probe to a probe compensation signal connector marked with IKHz and clamp a grounding hook marked with GND by a grounding clamp as shown in the figure below Figure 1 4 Function detection 3 Press AUTO Within few seconds CH1 displays a square wave of which the frequency is 1kHz and the peak to peak voltage value is 3V Lomp ung IK EN Limit Figure 1 5 Probe compensation signal 4 Connect the probe with channel 2 and CH2 displays the same waveform after AUTO is pressed 1 3 Probe 1 3 1 Probe safety Check and obey the rated values of the probe parameters before using it A protective device surrounding the probe
75. screen Is at an inverse display mode Display the background grid and coordinates Turn off the background grid Turn off the background grid and coordinates Set the duration time of the menu display Back to page 1 of the display system function menu Press DISPLAY to skip to the DISPLAY menu and press Type to select Vector or Point Set continue Press Continue to select OFF 1s 2s 5s or Infinite By utilizing the option some special waveforms can be observed as shown in figure 2 47 Figure 2 47 Utilize the continue option to observe amplitude modulated wave Set the waveform brightness Press Wave brightness and revolve the UNIVERSAL knob to regulate the display brightness of the waveform Set the grid brightness Press Grid brightness and revolve the UNIVERSAL knob to regulate the display brightness of the grid Set the display format Press Next Page1 2 to skip to page 2 of the display menu Press Format to select YT or Xy Set the screen Press Screen to select Normal or Inverse to set the color of the screen Set the grid Press the Grid option key to select ay or _ to set whether the grid is displayed on the screen Set the menu display Press the Menu display option key to select 2s 5s 10s 20s or Infinite to set the maintained display time length
76. selected rightly 7 equi sit epling Figure 2 43 Sine interpolation Figure 2 44 Linear interpolation 2 9 Display system DISPLAY is a function key of the display system Image of the location of the Key Table 2 29 Page 1 of the display system function menu Option Setup Description Vector The sampling points are displayed in a link line manner Type sya Ves ee Point No interpolation link line is displayed between the sampling points Display sample points directly OFF Is T Set the maintained display time length of each Persist displayed sampling point oS Infinite Set the waveform brightness by the UNIVERSAL Intensity RN Grid ra a Set the grid brightness by the UNIVERSAL knob brightness Next Page 1 2 Skip to the next page M S ns Os i Off Intensity Bri ghness Infinite ext Pape Next Pie Figure 2 45 Page 1 of the display menu Figure 2 46 Page 2 of the display menu Table 2 30 Page 2 of the display system function menu Option Format Screen Grid Menu display Back Setup YT XY Normal Inverse EH 2s 5S 10s 20s Infinite Page 2 2 Operation description Set the waveform display types Description The YT format is used for displaying the vertical voltage relative to the time horizontal scale The XY format is used for displaying the points sampled in channel 1 and channel 2 The screen is at a normal display mode The
77. sition of the cross cursor on the waveform is regulated by selecting Cur A or Cur B and rotating the UNIVERSAL knob The coordinates of the cursor point will be displayed on the screen of the oscilloscope Manual cursor measurement mode Table 2 32 Manual cursor measurement function menu Option Setup Description Cursor mode Manual Set the manual cursor measurement Voltage Manually use the cursor to measure voltage Types parameters Time Manually use the cursor to measure time parameters CHI Select the input channel of the measured signal CH2 Signal sources MATH REF A REFB Cur A Select the option using the UNIVERSAL knob to regulate the position of cursor A Cur B D Select the option using the UNIVERSAL knob to regulate the position of cursor B The manual cursor measurement mode is used for measuring the coordinate values and increments of one pair of horizontal or vertical cursors Ensure the signal source to be set rightly when using the cursors as shown in figure 2 50 m Voltage cursor The voltage cursor appears on the display screen as a horizontal line and it can be used for measuring vertical parameters m Time cursor The time cursor appears on the display screen as a vertical line and it can be used for measuring horizontal parameters m Cursor movement Select the cursors first and use the UNIVERSAL knob to move cursor A and cursor B wherein the values of the cursors will appear on the r
78. t and the differences of the probe compensation may cause errors of the measurement results 3 7 Screen capture Use the shortcut key PRINT to store the screen print in a USB flash disc 1 2 Press SAVE RECALL to select IMAGE STORE Select PRINT BUTTON as STORED IMAGE Set the PRINT shortcut key as screen capture USB flash disc storage function Access a signal to channel 1 and press CH1 to select COUPLING MODE as ALTERNATING CURRENT Regulate the vertical gear Volt div and the time base gear s div to display the best waveform Plug the USB flash disc and notice that USB MEMORY IS CONNECTED SUCCESSFULLY if the connection is normal Press PRINT to carry out storage and notice that DATA IS STORED SUCCESSFULLY Check the stored pictures in the computer such as GASO001 BMP Levu bie i E EW Limit Figure 3 5 GAS0001 BMP System prompt and fault recovery DIGITAL STORAGE OSCILLOSCOPE This chapter mainly introduces the problems about system prompt and fault recovery 4 1 System prompt information description Trigger electric level reaches the limit It prompts that the current trigger electric level has already reached the limit and cannot be regulated any more Horizontal position reaches the limit It prompts that the horizontal movement position has already reached the limit and cannot be regulated any more Voltage gear rea
79. t the mode Average value The oscilloscope acquires a plurality of waveforms and displays the final waveforms after averaging the waveforms Advantage Random or unrelated noises in the displayed signal can be reduced at the mode The signal shown in figure 2 40 has loud noises while the signal shown in figure 2 41 adopts the average mode so the noises are greatly reduced What calls for attention is that the higher the average time is the better the waveform quality is but the slower the refreshing speeds of the waveform is M500ns 0 05 ACQUIRE Trig dl M S00ns 0 0s J F f 1 00002MHz Cul 100mV CHI f Figure 2 40 Sampling mode Figure 2 41 Average mode m Real time sampling The real time sampling mode realizes suffusion of the storage space during each sampling The real time sampling rate is at most 1GSa s RUN STOP Press the key to start continuous data acquisition or stop acquisition SINGLE Press the key after the oscilloscope detects the trigger and stop after wave acquisition is finished once When RUN STOP or SINGLE is pressed to start acquisition the oscilloscope executes the following steps 1 Acquire enough data to fill the waveform part before the waveform is triggered which is also named pre trigger 2 Continue to acquire data when waiting for trigger 3 Detect the trigger conditions 4 Continue to acquire data before the storage space is full 5 Display the lately acquired wavefo
80. the test is failed Run Enter STOP state if output exist Output stop Stop Continue to run if output exists Rule setup Skip to a rule setup menu Back Back to the pass fail main menu Back Page 2 2 Back to page 1 of the pass fail menu Table 2 49 Page 1 of the rule setup menu Option Setup Description Horizontal Use the UNIVERSAL knob to set a horizontal regulation tolerance range 0 04div 4 00div Vertical Use the UNIVERSAL knob to set a vertical regulation tolerance range 0 04div 4 00div Build a rule template according to the two Build rules setups above u Inside u Save position l Select a save position for the rule Outside Next Page 1 2 Skip to page 2 of the rule setup menu Figure 2 75 Page 1 of rule setup menu Figure 2 76 Page 2 of rule setup menu Table 2 50 Rule setup menu 2 Option Setup Description Save Save the rule setups Recall Recall the waved rule setups Back Back to the rule setup main menu Back Page 2 2 Back to page 1 of the rule setup menu Pass fail is carried out by the following steps 1 Press UTILITY to skip to the UTILITY menu 2 Continuously press Next to skip to page 3 of the auxiliary menu 3 Press Pass fail to skip to the PASS FAIL menu 4 Press Test allowed to select Run 5 Press Signal source selection to select the signal input channel In figure 2 73 CH2 is selected 6 Press Next Page1 2 to skip to page 2 of the pass f
81. the vertical offset to zero Volt div knob 1 The knob can be used for regulating the vertical gear of the channel in where the knob is so as to amplify or attenuate the signal of the channel waveform The gear information of the channel is displayed in the lower part of the screen 2 The knob can be pressed to switch between Coarse tuning and Fine tuning and the sensitivity of the vertical gear is determined by a 1 2 5 stepping mode in coarse tuning Fine tuning represents further regulation at the current gear so as to display the waveform needed 2 5 3 Implementation of MATH function The arithmetical operation MATH function realizes waveform addition subtraction multiplication division and FFT operation of channels CHI and CH2 Arithmetical operation of the waveform could Table 2 6 MATH function menu Option Setup X Operation FFT me AA be canceled by pressing MATH button again Description Waveform operation of signal source 1 and signal source 2 Regulate the vertical gear of the MATH waveform by the UNIVERSAL knob Regulate the vertical offset of the MATH waveform by the UNIVERSAL knob Table 2 7 Description of the arithmetical operation function Operation Setup CH1 CH2 CH1 CH2 CH2 CH1 x CH1xCH2 CH1 CH2 CH2 CH1 FFT Description Add the waveform of signal source 1 with the waveform of signal source 2 Subtract the waveform of signal source 2 from the w
82. u Option Setup Description Trigger an NTSC or PAL standard video signal Type Video when selecting video and preset the trigger coupling as alternating current NTSC Select video standard for synchronization and Standard l PAL row counting i Auto Trigger Normal See the trigger mode in table 2 13 mode Single Skip to the trigger setup menu See table Setup 2 14 Back to page 1 of the video trigger function Back Page 2 2 menu Operation description As show in figures 2 31 2 32 Set the types 1 Press TRIG MENU key to display TRIGGER menu 2 Press Type to select Video Setup of the signal source of the video trigger is like that of the edge trigger Set the polarity 3 Press Polarity to select or Set the synchronization 4 Press Synchronization to select All row Specified row Odd field or Even field Revolve the UNIVERSAL knob to set the number of the specified rows if Specified row is selected Set the standard 5 Press Next Page 1 2 6 Press Standard to select PAL or NTSC Slope trigger Table 2 19 Page 1 of the slope trigger function menu Option Setup Description Type Slope CHI Signal CH2 source EXT See the signal source in 2 7 1 EXT 5 HF Positive slope gt KF Positive slope lt Positive slope Conditions of signal slope relative to set Conditions p Negative slope gt slope set by time
83. ure 2 22 Figure 2 22 Reference waveform menu Figure 2 23 Reference waveform Operation procedure 1 Press REF to display the menu REF WAV 2 Select the Signal source as CHlor CH2 3 Revolve the vertical POSITION and knob Volt div to regulate the vertical position and the gear of the reference waveform 4 Select REF A or REF B as storage location of the reference waveform 5 Press Save to save the current screen waveform as a waveform reference 6 Select REF A ON or REF B ON to recall the reference waveform as shown in figure 2 23 The waveform cannot be saved as reference waveform if it is displayed in an X Y mode The horizontal position and gear of the waveform cannot be regulated at a reference waveform state 2 6 Horizontal system As shown in the figure below one key and two knobs are in the horizontal control region HORIZONTAL Figure 2 24 Horizontal key and knobs HORI MENU Press this key to display the horizontal menu HORI MENU and window expansion can be implemented at this menu Besides horizontal displacement can be set by the horizontal POSITION knob M represents a main time base and Z represents an expanded time base M 1 O0is Figure 2 25 Main time base Figure 2 26 Window setup Table 2 12 Functional menu of the horizontal system Option Description Main time base Horizontal time scale system of the oscilloscope Define one window r
84. ursor A and cursor B Delta V Vertical distance namely the voltage value between the two cursors of cursor A and cursor B 2 10 3 Measurement As shown in figure 2 52 MEASURE is a function key for measurement MENU gf com er f f Measure MEASURE DISPLAY unse i j Figure 2 52 Measure keys The measurement includes three major items voltage measurement time measurement and delay measurement and there are 32 measurement minor items in total At most five items can be displayed once Press MEASURE to skip to the measurement menu to display the measurement result at first as shown in figure 2 53 and press any option key to change the measurement type as shown in figure 2 54 WERE ETP Ol Lage Figure 2 53 Measurement result Figure 2 54 Measurement type Table 2 35 Measurement function menu 1 Option Description Voltage Press the key to skip to the voltage measurement menu measurement Time Press the key to skip to the time measurement menu measurement Delay Press the key to skip to the delay measurement menu measurement All measurement Press the key to skip to the all measurement menu Back Press the key to get back to the measurement result Table 2 36 Measurement function menu 2 volage test menu Option Setup Description Signal CH1 CH2 Select a signal source for a source voltage test Maximal value minimal value Press Measurement type or peak to peak value amplitud
85. utomatic measurement 32 3 Degrees Point display vector display Edge pulse video slope alternation CH1 CH2 EXT EXT 5 AC Line Auto normal single DC AC Low frequency rejection high frequency rejection CH1 CH2 10div EXT 1 5V EXT 5 7 5V CH1 CH2 lt 1 div EXT lt 0 15V EXT 5 lt 0 75V 100ns 10s Type rise descend rise and descend edge Type gt lt positive pulse width gt lt negative pulse width Pulse width 20ns 10s Pulse width resolution 5ns or 1 take the higher value Support signal system PAL NTSC Trigger condition odd field even field all rows specified row gt lt positive slope gt lt negative slope Time setup 20ns 10s CH1 trigger type edge pulse video slope CH2 trigger type edge pulse video slope Maximal valve minimal value peak to peak value amplitude top value bottom value periodic average kinds Cursor measurement Control panel Function Auto setup Save recall value average value periodic mean square root mean square root rise extreme descend extreme rise time descend time frequency period pulse width positive pulse width negative pulse width positive duty ratio negative duty ratio phase FRR FRF FFR FFF LRR LRF LFR LFF Manual measurement mode cursor tracking measurement mode The auto setup function can realize automatic regulation of the vertical system the horizontal system and the t
86. waveform and use degree to represent the FRR FRF FFR FFF LRR LRF LFR LFF time quantity wherein 360 degrees form a period Time between the first rise edges of signal source 1 and signal source 2 Time between the first rise edge of signal source 1 and the first fall edge of signal source 2 Time between the first fall edge of signal source 1 and the first rise edge of signal source 2 Time between the first fall edges of signal source 1 and signal source 2 Time between the first rise edge of signal source 1 and the last rise edge of signal source 2 Time between the first rise edge of signal source 1 and the last fall edge of signal source 2 Time between the first fall edge of signal source 1 and the last rise edge of signal source 2 Time between the first fall edge of signal source 1 and the last fall edge of signal source 2 Carry out the following steps to measure the voltage parameters 1 Press MEASURE key to skip to the MEASURE menu 2 Press the first option key to skip to the measurement function menu 1 in a measurement result region in the homepage 3 Select Voltage measurement 4 Press Signal source and select CH1 or CH2 according to the signal input channel 5 Press Measurement type or revolve the UNIVERSAL knob to select the voltage parameters to be measured The corresponding icons and parameter values will be displayed in the menu corresponding to t
87. wn in figure 2 10 Coupling DE Coup ing 4 DC Bw Limit Bandwidth limit identification Figure 2 9 Bandwidth limit ON Figure 2 10Bandwidth limit off 3 Regulation and setup of gear Vertical gear regulation comprises two modes including coarse tuning and fine tuning and the vertical gear range is 2mV div 5V div when the probe is set as 1X Use CHI as an example Press CH1 gt Volt div Coarse tuning and determine the vertical gear by a 1 2 5 stepping mode in coarse tuning as shown in figure 2 11 Press CH1 Volt div Fine tuning and fine tuning is further regulated in the current vertical gear Fine tuning can be applied to improve waveform display so as to contribute to observation on signal details if the amplitude of the input waveform is a little larger than the full scale at the current gear but is a little smaller when the waveform is displayed at the next gear as shown in figure 2 12 Coupling DC BY Limit Figure 2 11 Coarse tuning Figure 2 12 Fine tuning 4 Probe proportion setup To be matched with the probe attenuation coefficient the probe attenuation proportion coefficient should be accordingly regulated in the channel operation menu If the probe attenuation coefficient is 10 1 the proportion of the input channel of the oscilloscope should be set as 10X so as to avoid the errors of the displayed gear information and the measured data Use channel CH1 as a

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