Troubleshooting Your Design
Contents
1. E Da Shamoli ms DE Ds HH amp OOH eration TDS2000C Series Oscilloscope FREH s 22 P RS Pe AL A ANEROS SARRMTS ZA BLURMRBAE BTREORBLH http www mavin com tw TEL 03 5970828 FAX 03 5972622 fJiAO Lebel NRE F2. tk h 5 7 eo i E we REE i Troubleshooting Your Design with the TDS2000C Series Oscilloscopes Tektronix BURR TS Se A BIR 2S i 4 http www mavin com tw TEL 03 5970828 FAX 03 5972622 fJiAD Lele LT SOUR 3i2F Table of Contents Troubleshooting Your Design with the TDS2000C Series OscillOSCOPE 6cee 4 NI A Cla jas creaa come saiaiceeaadancndeaceatas O E N E 5 Capture Elusive Glitches and ANOMAlGS arwsiriinisisriiceissirrnonniiaaanrriiia 6 7 VeDUG Vital Timing ft eh I sssaaa 8 Verniy Timing Relations NiDS inv sresz0denrvessaienspeuecnaiadaaknanreaxeisenseasnsmntenkmrsnsinaduresserasevans 9 ONEK onal Mei ernia i Ea a 10 11 Debugging Digital System LOCK HUD senacsscsicernwaietsaddedaeacnisnes acnccievendsudeiecnninexducersatbes ie TESU TOP Pie SECS OF Video ICING sasi iinan RN AE 13 Lock Tor Unintentional Circul NOISE isirisisinsderoiioinnaika nE E E 14 15 Power Line Harmonic AN lySIS cccccssccseccseceeeceeceseceeeasecaeeeeeeaseceesaeeseeeeeeseneas 16 17 Automatically Capture and Save Elusive Waveform ANOmMAaliesS i c 18 Make a Quick Pass Fail Test of Your DViCO cssascastoeochicatcsthmeaasieactienpsiatedgenicapninss 19 Documenting Your Results with OpenChoice Software cccccececssseeeseesersneeenanes 20 Waveform Measurements LOGGING siduiacacapensssaunasitiiudolanaiiaupentesrieadechasolamasevaivicasades 21 Waveform Analysis using NI SignalExpress Tektronix Edition ccccccseceeeeseeeeees
3. i 7 J tery seat SR SP a Per od CT are fe ZANA BUTARA n ANERSS SERRATOLE BURMRBAS ATHETA TDS2000C Series Oscilloscope http www mavin com tw TEL 03 5970828 FAX 03 5972622 TUW OI 6EL NRF 5 Capture Elusive Glitches In today s high speed digital designs elusive glitches and random peak detect feature Peak detect can capture narrow glitches even anomalies can cause circuits to fail While finding these glitches has on low frequency signals never been easy the TDS2000C Series simplifies this task with its M Pos 0 000s ACOUIRE To use the Peak Detect feature Atte 1 Display the waveform on the screen Sample Press the ACQUIRE front panel menu button 2 3 Press the Peak Detect menu button A Notice that the oscilloscope captures several very narrow glitches FL even at slow sweep speeds Without peak detect you would not Awerage have seen many of these glitches Averages Mi SUUms o May 06 2337 l EA Ei TDS2000C Series Oscilloscope BBE 7s AG IRS a E a AAR A nenenmonen 6 http www mavin com tw TEL 03 5970828 FAX 03 5972622 WMM OIL EL SOUR 3 HF Capture Elusive Glitches continued Intermittent signal anomalies can also be a challenge to see The TDS2000C Series provides variable and infinite persistence display Capabilities to provide you with information about the signal HM Pos O 000s DISPLAY Type Persist Infinite Format Contrast 50 Ml TU Uns
4. Mat Trem EG Weg TEE OM 077TH woah wm Sheet i P Jf Shaped f Sees ypa _ OOR RACH S d A Rna FARHA UR HABRA A ANEHSS SARRMTRSCE BURRRBAS BRHETZBLEZA TDS2000C Series Oscilloscope http www mavin com tw TEL 03 5970828 FAX 03 5972622 717 ADO Tbe IR 21 Waveform Analysis Using NI SignalExpress Tektronix Edition Software Although the TDS2000C provide significant on board analysis Edition provides advanced analysis capabilities with the ease of USB Capabilities there are applications where the analysis requirements plug and play are better met with PC based applications SignalExpress Tektronix Uatitted 1 LabVIEW Signalf xpress DE 1 Acquire the signal File Edt ves Took Add Step Dataview Window Hep C Add step 0an einga i Recod J ua Tig Ad Deeply TD hack of Shove Help Connect the oscilloscope to the PC using a USB cable Monitor Plecord SF Step Seip Data View FI Plecoreinag Dpto a amp Fraen Documaniatary 2 3 Launch the SignalExpress TE program B Tek TDS1000 2000 z ES Tis zini 4 ES tos 2ozecycu2 2 b TS AH Fieg SignalExpress will open with the instrument automatically connected and transferring data to the PC 5 To conduct a limit test of the signal against specified limits select Add Step gt Analog gt Test Limit gt Test 6 To display the histogram of the signal select Add Step gt Analog gt Time Domain Measurements gt Histogram
5. USB device to the oscilloscope s front panel USB port 3 Press the Utility front panel button 4 Press the Data Logging side menu button to select the data logging function 5 Setup the duration time from 30 minutes to 8 hours 6 Press the Data Logging side menu button to start stop the test RAER ANEKSS SERRATOZE AURREA AVHTIBBL4 CA TEL 03 5970828 FAX 03 5972622 7 JAD Tbe LURF 19 Documenting Your Results with OpenChoice Software Design engineers in the lab and technicians in the field often need to copy the files to their PC The easy to use OpenChoice Desktop document the work they do with their oscilloscope They can save simplifies these documentation tasks by directly transferring screen screen images to a removable memory device and then manually images to your PC over USB Tek TOS 2024C OpenChoice Desktop w ir A a i Acquire the signal Screen ea Waveform Get amp Send 5 8 i ference Capture a Data Capture Settings Preferences Connect the oscilloscope to the PC using a USB cable Select Instrument m Teh veh ree rn Launch the OpenChoice Desktop program TOS 20240 Aa WD N Click Select Instrument choose the correct USB instrument and click OK Ol Get Screen Click Get Screen to capture the screen image 6 Click Save As to save the screen image to a file on the PC 7 Click Copy to Clipboard You can then launch your documentation program and paste the image into the
6. document AUTHSET Li lL bhii i L T EE Ea iiid ore Mi S00 us BATA e tamy 14 Sep 10 03 25 999 960He Copy to Clipboard TOS 2024C 9 25 33 AM 9 14 2010 Modify Note Tektronix i i EA Ei TDS2000C Series Oscilloscope r A arh eo on a 7 URS AR ANERE SSRRATOZE BURMAN ATRETEBZA http www mavin com tw TEL 03 5970828 FAX 03 5972622 MOIL ELKE F Waveform Measurements Logging A common task for engineers and technicians is to make However this is time consuming and can lead to inconsistent quality measurements on their oscilloscope and then manually record of documentation The easy to use TekXL toolbar simplifies data measurements to document circuit performance variations over time gathering and documentation tasks inside Excel 1 Acquire the signal G a sie Cine tual B p yee pe Ar pa p werner ke 228x Cee Bas lees Beh SL T we m psp PSSM ex YS oO eA Qe coli T 2 AF Connect the oscilloscope to the PC using a USB cable 3 Launch Excel and enable the TekXL toolbar by selecting ETE Tools gt Add ins and checking the box next to Tekxltoolbar salted Tita O j aa 4 Press the TekXL Connection icon select the desired instrument and press OK Press the TekXL Measurements icon E i REFET FE EE TE On the Selection tab choose Frequency On the Timing tab select 45 samples CO N O OO On the Charting tab choose Upon Completion 00 OT eet Won Reve
7. 000s tacks To make signal integrity measurements using pi te 4 Ball automatic measurement system 1 Press the MEASURE front panel button 2 Press a CH1 side menu button to add an automatic measurement 3 Press the Type side menu button until you find the desired measurement and then press Back 4 Repeat steps 2 and 3 to select and display up to 5 measurements 5 View the selected measurements on the right side of the display Bee BUTARA Ba BNEHS S SSRRMRSCR BURBRBRE ARH TDS2000C Series Oscilloscope http www mavin com tw TEL 03 5970828 FAX 03 5972622 771 O Tbe INI RF 11 Debugging Digital System Lock up One common cause of digital system lock ups is an intermittent clock The TDS2000C Series trigger system can quickly and easily identify unexpected interruptions in the clock signal M Pos 52 0 ns TPIGGEP Press TRIG MENU front panel button Type Press Type side button until Pulse is selected Press When until gt is selected Source Using the multipurpose knob set Pulse Width to slightly longer CH1 than the clock pulse Wher Press more and press Polarity until Negative is selected Pvt You can also adjust the TRIGGER LEVEL to capture low amplitude or runt pulses Pulse Width 33ans more page 1 of 2 Mi TU0ns 59 May 06 22 26 l EA Ei TDS2000C Series Oscilloscope BBE 7s AG IRS a ANEHE SERRATE BURMRBRE Brttosautom 12 http www mavin com tw TEL 03 597
8. 0828 FAX 03 5972622 7 7 AC Ge 1 SOURS R2F Test For The Presence of Video Signals Video technicians must perform a quick check for the presence of a video signal at different test points If the site is in the field technicians will need lightweight portable test equipment gear that Mi Pos 30 00 us TRIGGER Type SOUrCe CH1 Polarity Normal SWE All Lines Standard Mi 10 0 us 5 May 06 25 05 NTSC they can easily carry to each location The TDS2000C Series video trigger features make this oscilloscope a valuable tool for these technicians 1 Connect the video signal to the oscilloscope using proper adapters and a 75 Q terminator if necessary 2 Press the AUTOSET front panel button 3 Press the Line Field side button to select video line triggering If a broadcast standard video waveform is present the oscilloscope will display a stable video waveform that is triggered on all lines 4 To add some display persistence press DISPLAY and press Persist to select the desired persistence 5 Adjust vertical position and scale as desired 6 To adjust trigger setup press TRIG MENU and change Source Polarity and video Standard 7 lf desired reconnect the oscilloscope to other test points You do not need to change any oscilloscope settings Rae BUTARA Fa BNBHSS SSRRMROCR BURMRBAE BRHTOBRItCR TDS2000C Series Oscilloscope http www mavin com tw TEL 03 5970828 FAX 03 5972622 7 JiAD Lb T
9. 22 RARR RS PEAR A FUEROS SERRMTSImR BLUMER BETREIBEN http www mavin com tw TEL 03 5970828 FAX 03 5972622 1 J iO Ske LOR sHe2F Troubleshooting Your Design with the TDS2000C Series Oscilloscope Today s engineers and technicians face increasingly complex and critical troubleshooting tasks New digital designs often challenge designers with new problems to find race conditions transients signal aberrations bus contention problems etc And of course competitive time to market pressures dictate that troubleshooting must be completed quickly and accurately The TDS2000C Series delivers the performance affordability and portability that enable engineers and technicians to tackle these challenges quickly and easily More than just a matter of basic bandwidth these oscilloscopes enable users to solve problems quickly helping them to establish that a problem exists allowing them to capture the problem accurately and enabling them to analyze it to determine the root cause TDS2000C Series Oscilloscope http www mavin com tw The tips on the following pages are designed to further simplify your troubleshooting tasks But if you need more help there is plenty available Simply contact your local Tektronix representative authorized distributor or visit www tektronix com oscilloscopes m 50 70 100 and 200 MHz models m Up to 2 GS s sample rate on all channels m Active TFT Color Display for easy viewing at a dist
10. 3 5972622 fJiAD Tse 1 S0Urg3R2F 9 Check Signal Integrity Electronics engineers may discover that a wide array of unintentional electrical events will make a difference in how circuits function in the real world To characterize these events engineers can measure iM Pos O 000s CURSOR Type Amplitude SOUrce Mi 1UL0ns o May 06 22 53 criteria Such as overshoot ringing ground bounce cross talk and other signal integrity issues The TDS2000C Series cursors can be used to make such measurements To make signal integrity measurements using cursors 1 Press the CURSOR button 2 Press the Type menu button until the Amplitude cursor type is selected 3 Press the Cursor 1 menu button 4 To measure the peak ringing below ground place cursor 1 at O Volts using the multipurpose knob 5 Press the Cursor 2 menu button and place cursor 2 on the negative peak using the multipurpose knob 6 View the absolute Voltage measurements on the cursor readouts at the side of the display The A readout indicates the difference between the cursor positions l EA Ei TDS2000C Series Oscilloscope BBE 7s AG IRS a BNEHS S SSRRMTRSCR BURMRBAE BrttoseutoRm 10 http www mavin com tw TEL 03 5970828 FAX 03 5972622 fJiiAD Tse 1 Ure 3 he2F Check Signal Integrity continued The TDS2000C Series automatic measurement system can also be used to make such measurements quickly and automatically M Pos 0
11. L SOUR3R2F 13 Look for Unintentional Circuit Noise Developers need to check for unintended noise in their prototypes However noisy signals can be difficult to analyze in the time domain as shown below MM Pos 0 0006 CH1 E Coupling 2 a Pe i WOtage Inver CAL 100mm Aal Us CAT O00 Ca POSH Y TAJR IS la P TDS2000C Series Oscilloscope igi as qs AR Be sil http www mavin com tw Engineers and technicians can use the Fast Fourier Transform FFT to break down signals into component frequencies which the oscilloscope uses to display a graph of the frequency domain of a signal as opposed to the oscilloscope s standard time domain graph Developers can then associate those frequencies with known system frequencies such as system clocks oscillators read write strobes display signals or switching power supplies Nk jes a BABRSS SRBRRATRSCE BURBRBAe BRAROSIBANASCA TEL 03 5970828 FAX 03 5972622 71JiifO TL See 1 UEIF Look for Unintentional Circuit Noise continued The TDS2000C Series offers a standard FFT feature making it an 1 Press the front panel MATH button ideal tool for these identifying sources of noise in a circuit To create 9 Press the Operation menu button until FFT is selected FFT display 3 Press the Window menu button until the Hanning window is selected which provides the highest frequency resolution CURSOR 4 If desired use the vertical and horizontal PO
12. SITION and SCALE controls to magnify and position the FFT waveform Type ae 5 Cursors can be used to accurately measure the FFT waveform Press CURSOR Source l MATH 6 Press the Source menu button until MATH is selected 7 Press the Type menu button until Frequency is selected 8 Press the Cursor 1 menu button Using the multipurpose knob position cursor 1 at the left side of the display 9 Press the Cursor 2 menu button Position cursor 2 on the highest point in the display 10 The readout indicates one of the sources of noise In this case the 20 MHZ signal is the system clock which is coupling into the signal 5 May 06 23 21 6 07791kHz ZANA BUTARA n ANERSS SERRATOLE BURMRBAS ATHETA TDS2000C Series Oscilloscope http www mavin com tw TEL 03 5970828 FAX 03 5972622 TUW OI ELNI F 15 Power Line Harmonic Analysis Power circuit designers often need to analyze the effects of their do not creating harmonics on the power line The TDS2000C circuits on the power line Although an ideal power supply would provide simple tools to measure power supply currents and analyze present a constant load on a power line real power supply circuits the harmonics on a power line To display the power line harmonics on a current waveform 1 Press the CH 1 MENU front panel button 2 Press the Probe side menu button 3 Press the Current side menu button to select current probe Support 4 Press the Scale side menu bu
13. ance at an angle or under dim lighting conditions m Built in USB host and device ports standard m Easy documentation and analysis with PC connectivity software m Lifetime warranty Limitations apply For terms and conditions visit www tektronix com lifetimewarranty a i g BUTARA n iaki SAREMTSCR AURMRBAE BETHET ZA TEL 03 5970828 FAX 03 5972622 JHR OILI E L I RF 4 Getting Started To optimize your troubleshooting task at hand it is important to stat To properly compensate and attenuate your probe at the beginning with proper probe compensation and attenuation follow these simple steps default setup and automatic instrument setup 1 Connect the probe to channel 1 2 Attach the probe tip and reference lead to the PROBE COMP PROBE COMP AUTOSET connectors If using the probe hook tip ensure a proper button FLA connection by firmly twisting the tip onto the probe Overcompensated 3 Push PROBE CHECK feel 4 The oscilloscope will automatically check the probe attenuation Undercompensated and check the shape of the displayed waveform to determine if a your probe is compensated correctly CH 1 JUUL 5 If necessary it will instruct you to adjust your probe compensation Compensated Correctly To ensure that you begin with factory initialization settings follow these simple steps 1 Press the front panel DEFAULT SETUP button N TPP Series a 2 Press the front panel AUTOSET button
14. is case The readouts at the right of the screen indicated the absolute and relative frequencies and magnitudes BUTARA n eros SARRARSCR BURBRBAS BRHTOBe tow TDS2000C Series Oscilloscope http www mavin com tw TEL 03 5970828 FAX 03 5972622 7 Ji A D Tbe SOUR 3R2F 17 Make a Quick Pass Fail Test of Your Device Design engineers doing validation test and debug or manufacturing and failing waveforms You can also set a user defined stop engineers performing repetitive tests often need to compare live condition including stop on manual control elapsed time waveform waveform signals against a know good reference signal The count or waveform violations When a failure condition occurs the TDS2000C offers quick pass fail testing also known as limit oscilloscope can be set to stop acquisition or save a screen image testing by comparing active signals against a user defined template and or waveform file to a USB device enabling complete unattended waveform The oscilloscope can be set up to count both passing operation M Pos O 000s masg To create a template for limit testing and perform SOUICE a limit test CHS 1 Press the Utility front panel button Compare To 2 Press the Limit Test side menu button to select Limit Test heth 3 Press Template Setup side menu button to set up your template techs 4 Set the vertical and horizontal limits of the template waveform est Run 5 Press Apply Template side menu but
15. lse Width 60n more page 1 of 2 M 250m5 5 Mlay 06 22 33 l EA Ei TDS2000C Series Oscilloscope iR PHARA H ANEHS S SERRATO BURRBRBRE BRHTOBBwtoR http www mavin com tw TEL 03 5970828 FAX 03 5972622 3F1T O 3s 1 03 2F Verify Timing Relationships Electronics engineers often need to verify that their circuits width period and frequency The TDS2000C Series cursors can be are working as designed One of the most common types of used to make such measurements quickly and easily oscilloscope measurements is timing measurements such as pulse HM Pos O 000s CURSOR Teas To make timing measurements using cursors pe Time 1 Press the CURSOR button 2 Press the Type menu button until the Time cursor type is selected SOUrCe 3 Press the Cursor 1 menu button 4 To measure the timing relationship between two signals place cursor 1 on the first edge of interest using the multipurpose knob 5 Press the Cursor 2 button and place cursor 2 on the second edge of interest at approximately the same Voltage 6 The cursor readouts indicate the timing of the cursors relative i to the trigger point In this example the At readout indicates Mi 10 0ns CHTIL 4 the period of the waveform and the 1 At is the frequency of 5 May 06 22 44 20 0007 MHz the signal Sees BUTARA n BNBHSS SERRATE BURBRBAE BRHTOB ato TDS2000C Series Oscilloscope http www mavin com tw TEL 03 5970828 FAX 0
16. o May 06 25 23 variations over time making it easier to understand the characteristics of the transients you ve captured To use Display Persistence 1 Display the waveform on the screen 2 Press the DISPLAY front panel menu button 3 Press the Persist menu button until the desired amount of persistence is selected 4 Notice that the most recent signal is highlighted in the display By monitoring the screen updates you can judge the relative frequency of occurrence of the signal anomalies a i BUTARA n iaki SAREMTSCR AURMRBAE BETHET ZA TDS2000C Series Oscilloscope http www mavin com tw TEL 03 5970828 FAX 03 5972622 WOL EL UIF 7 Debug Digital Timing Problems Digital designers need to quickly find and analyze a wide range of pulse width trigger can help troubleshoot such situations by circuit timing problems For example race conditions and transients triggering when a signal pulse width is less than greater than can cause circuits to perform inaccurately The TDS2000C Series equal to or not equal to a specified pulse width M Pos 0 000s TRIGGER To use the pulse width trigger Type 1 Press the TRIG MENU front panel button 2 In the side menu press Type until Pulse is selected Source 3 Press the When side menu button until lt is selected eal 4 Use the multipurpose knob to set the desired minimum WHET pulse width 5 Select as desired Source Polarity Mode and Coupling Pu
17. ton to store the limit test template Template Setup 6 Press the Stop side menu button to setup stop options more page 1 of 2 M S0 0ns 3 d ny 8 Ref 1 00 25 0ms TDS2000C Series Oscilloscope igi as qs AR Be sil http www mavin com tw Press Action on Violation side menu button to setup the action the oscilloscope should take when a violation occurs Press the Run Stop Test side menu to start stop the test ZANA ANERSE SARRARS CH wRMRBAe BMR EAER TEL 03 5970828 FAX 03 5972622 71JiifO TSee 1 UIF Automatically Capture and Save Elusive Waveform Anomalies Engineers often spend hours trying to capture specific events or waveform anomalies The TDS2000C offers a data logging function that allows the oscilloscope to capture signals based on user specified trigger conditions Multiple triggered waveforms can be Mi Pos 276 0ns Lata Logging Data logging Off Source CH1 Duration E hour Select Folder E E E 1 E H j Gi 1enpirir ae t geo ee bt opt aoa Pierre d GEUTE C NTETE E E a a a 12 4ug 10 14 24 WERKA BR ZS H http www mavin com tw TDS2000C Series Oscilloscope recorded based on user defined time durations selectable in 30 minute increments up to 8 hours of total time Waveforms are time stamped and recorded to USB device and stored in CSV file format To use the data logging feature 1 Setup an appropriate trigger mode and acquisition mode 2 Plug in your
18. tton to select the appropriate Current probe scale factor 5 Notice the readouts at the bottom of the display where the waveform s vertical units are now in milliAmps mA 6 Press the MATH front panel button 7 Press the Operation side menu button until FFT is selected M5 00ms 8 Press the Window side menu button until Flattop is selected This window is best for measuring amplitudes accurately i i EA Ei TDS2000C Series Oscilloscope A E yea ao ma Eon E M SUBS Pe ALA A RAESS SERRETOZE MURRER ETRETBBLE ZA http www mavin com tw TEL 03 5970828 FAX 03 5972622 fJiAD Tse 1 NR 2F Power Line Harmonic Analysis continued The FFT display provides a frequency domain display of the power line signal including the fundamental power line frequency and the harmonics at integer multiples of the fundamental frequency The CURSOR Type SOUrCe J May 06 06 40 TDS2000C cursor measurements provide an easy and accurate way to analyze this complex display Press the CURSOR front panel button Press the Source side menu button until MATH is selected Press the Type side menu button until Frequency is selected Press the Cursor 1 side menu button and use the multipurpose Knob to align the cross hair cursor on the left most peak the fundamental Press the Cursor 2 side menu button and use the multipurpose Knob to align the cross hair cursor on the next highest peak the 3rd harmonic in th
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