Instructions TDS 200-Series Extension Modules 071-0409-01
Contents
1. m All eight bits of binary data contain meaningful information To make sure that all eight bits are received or transmitted configure the external RS 232 device to receive and transmit eight bit characters set the RS 232 word length to eight bits Reporting RS 232 I O Errors Errors are reported when there is a problem with parity framing or input output buffer overruns To report errors the oscilloscope posts an event code When an error occurs the oscilloscope discards all input and output and waits for a new command Checking Command Status If you want to check the status of each command sent you can append an STB query after every command and read the response string TDS 200 Series Extension Module Instructions 19 TDS2CM Communications Module Processing Break Signals When the oscilloscope senses a break signal on the RS 232 port it returns DCL followed by the end of line terminator Internally the oscilloscope acts as if it received a GPIB lt DCL gt command causing the oscilloscope to erase the contents of the input and output buffers and then wait for a new command Break signals do not change oscilloscope settings or stored data and do not interrupt front panel operation or nonprogrammable functions If a break signal is sent in the middle of a character stream several characters immediately preceding or following the break can be lost The controller should wait until it receives the DCL and the end of2. 19200 Flow Control Hardflag Softflag Sets data flow control S oftflag X on None Xoff Hardflag RTS CTS Use hardware flagging when transfer ring binary data EOL String CR LF CR LF Sets the end of line terminator sent by LF CR the oscilloscope Parity None Even Odd Adds an error check bit ninth bit to each character TDS 200 Series Extension Module Instructions TDS2CM Communications Module Testing the RS 232 Interface To test the oscilloscope RS 232 interface 1 Connect the oscilloscope to a personal computer PC using an appropriate RS 232 cable refer to the table on page 12 Turn on the PC On the PC run a terminal emulator program such as Microsoft Windows Terminal Make sure the PC serial port is set as follows Function Setting Baud rate 9600 Data flow control Hardflag Parity None 4 5 EOL string LF Turn on the oscilloscope Connect the oscilloscope probe to the channel 1 input connector Attach the probe tip and ground lead to the PROBE COMP connectors The PROBE COMP signal is a square wave with a frequency of 1 kHz and a peak voltage of 5 V The following figure shows how to hook up the probe to the oscilloscope TDS 200 Series Extension Module Instructions 15 TDS2CM Communications Module TDS 200 Series Digitizing oscilloscope PROBE COMP CH 1 connector 6 On the oscilloscope push UTILITY Options p RS 232 7 Check that the menu se
3. Features The following table lists the module features FFT rise fall time pos neg Module Centronics pulse width ee a oe a TDS2MM e e e e 2 TDS 200 Series Extension Module Instructions Getting Started Removing and Installing Modules A The following sections describe how to safely remove and install a module on your oscilloscope Preventing Electrostatic Damage CAUTION Electrostatic discharge ESD can damage components in the extension module and the oscilloscope To prevent ESD follow the steps below when installing removing or handling the extension modules Always turn off the oscilloscope before removing or installing extension modules Handle extension modules as little as possible Transport and store extension modules in a static protected bag or container Do not slide the extension module over any surface Wear a grounded antistatic wrist strap to discharge the static voltage from your body while installing or removing an extension module from the oscilloscope Do not touch the oscilloscope extension module connector pins Do not use any devices capable of generating or holding a static charge in the work area where you install or remove extension modules Avoid handling modules in areas that have a floor or work sur face covering capable of generating a static charge Make sure that you install the extension module cover after you remove an ext
4. Frequency at the center graticule line Vertical scale in dB per division 0 dB 1 Vrms Horizontal scale in frequency per division Sample rate in number of samples per second DUD Br oe Bor FFT window type TDS 200 Series Extension Module Instructions 35 TDS2MM Measurement Module FFT Windows Windows reduce spectral leakage in the FFT waveform The FFT assumes that the YT waveform repeats forever With an integral number of cycles 1 2 3 the YT waveform starts and ends at the same amplitude and there are no discontinuities in the signal shape A non integral number of cycles in the YT waveform causes the signal start and end points to be at different amplitudes The transitions between the start and end points cause discontinuities in the signal that introduce high frequency transients Time domain YT waveform lt Center 2048 _ data points Discontinuities VY FFT LA Without windowing 36 TDS 200 Series Extension Module Instructions TDS2MM Measurement Module Applying a window to the YT waveform changes the waveform so that the start and stop values are close to each other reducing the discontinuities Time domain YT waveform Center2048 data points Point by point or multiply gy eM Window function Hanning YT waveform after windowing FFT ig With windowing TDS 200 Series Extension Module Instr
5. Portuguese 071 0403 XX a Simplified Chinese 071 0406 XX 0000 Traditional Chinese 071 0407 XX T Korean 071 0408 XX Ae Russian 071 0404 XX wo O 5 O r These manuals contain a language overlay for the front panel controls SSO TDS 200 Series Extension Module Instructions The OIOIOIO module instructions are available in these languages p LOOOQO Engish 071 0409 XX TDS 224 French 071 0483 XX Italian 071 0484 XX f German 071 0485 XX Spanish 071 0482 XX Japanese 071 0488 XX Portuguese 071 0486 XX Simplified Chinese 071 0489 XX Traditional Chinese 071 0490 XX Korean 071 0491 XX Russian 071 0487 XX 46 TDS 200 Series Extension Module Instructions Appendix C Manuals TDS 200 Series Digital Oscilloscope Programmer Manual The programmer manual English 071 0493 XX provides command syntax for remote control of the TDS 200 Series oscilloscope TDS 200 Series Extension Module Instructions 47 Appendix C Manuals 48 TDS 200 Series Extension Module Instructions
6. Compliances The TDS 200 Series Extension Modules meet the following certifications and compliances Certifications and Compliances EC Declaration of Meets intent of Directive 89 336 EEC for Electromagnetic Conformity Compatibility for Product Safety Compliance was demonstrated to the following specifications as listed in the Official J ournal of the European Communities EN 50081 1 Emissions EN 55011 Class A Radiated and Conducted Emissions EN 60555 2 AC Power Line Harmonic Emissions EN 50082 1 Immunity IEC 801 2 Electrostatic Discharge Immunity IEC 801 3 RF Electromagnetic Field Immunity IEC 801 4 Electrical Fast Transient B urst Immunity IEC 801 5 Power Line Surge Immunity U S Certifications FCC 47 CFR Part 15 Subpart B Class A Australia New Zealand Meets intent of Australian Radiocommunications Act of 1992 Declaration of Compliance demonstrated and declared for the following Conformity Specification AS NZS 2064 1 2 Industrial Scientific and Medical Equipment TDS 200 Series Extension Module Instructions 43 SS ELL _ LL _ _ Appendix B Comparing GPIB and RS 232 The following table provides an in depth comparison of the GPIB and RS 232 interfaces You should select the interface that best meets your requirements Operating Attribute RS 232 Cable IEEE 488 Std 9 wire Data flow control Hardware 3 wire hand Flagging shake soft XON XOFF hard RTS CTS Data format 8 bit parallel 8 bit
7. Follow these steps to set up the YT waveform 1 Press AUTOSET to display a YT waveform 2 Position the YT waveform vertically at center screen zero divisions to get a true DC value A standard FFT computation yields a DC value that is twice as large as it should be with respect to the other frequencies The TDS2MM Module corrects this error 3 Position the YT waveform horizontally so that the waveform area of interest is contained in the center eight divisions The TDS2MM Module uses the center 2048 points of the time do main waveform to transform into an FFT waveform 4 Set the YT waveform VOLTS DIV so that the signal does not go off screen Off screen waveform peaks can result in FFT waveform errors 5 Set the YT waveform SEC DIV to provide the resolution you want in the FFT waveform It is important to show a number of signal cycles if possible Setting the time division to a faster setting means the FFT waveform shows a larger frequency range has less frequency resolution and reduces aliasing refer to Aliasing on page 39 for more information In many cases you can produce a useful FFT waveform even if the YT waveform is not triggered This is especially true if your signal is periodic or random noisy However transient or burst waveforms should be triggered and positioned as close as possible to center screen TDS 200 Series Extension Module Instructions 31 TDS2MM Measurement Module 32 Nyquist Frequenc
8. Hardcopy the hard copy device 1 Refer to Read Me First on page 1 for more Seiko printer informa tion NOTE If you use the RS 232 or GPIB port you also need to set up the parameters for the port appropriately for your printer 8 TDS 200 Series Extension Module Instructions Getting Started Testing the Hard Copy Port 1 If you have already connected the oscilloscope to a printer go to step 4 Turn off the oscilloscope and the printer Connect the oscilloscope to the printer using the appropriate cable Turn on the oscilloscope and the printer If you have not done so already do the hard copy setup appropriate for your extension module Refer to page 8 On the oscilloscope push the HARDCOPY button The printer should begin printing a copy of the oscilloscope screen after a few seconds Printing an Oscilloscope Screen To print the screen data push the HARDCOPY button The oscilloscope takes a few seconds to capture the screen data and send it to the printer The printer then begins printing a copy of the oscilloscope screen Your printer settings determine how long it takes to print the screen data TDS 200 Series Extension Module Instructions 9 aa a nny TDS2CM Communications Module This chapter describes how to set up and test the TDS2CM Communications Extension Module RS 232 and GPIB interfaces The TDS2CM Module information also applies to the communica tions portion of the TDS2MM Measure
9. and 10 of the first falling edge of the waveform Falling edge must be displayed to measure Pos Width Neg Width Measures the time between the first rising edge and the next falling edge at the waveform 50 level Rising and falling edges must be displayed to measure Measures the time between the first falling edge and the next rising edge at the waveform 50 level Falling and rising edges must be displayed to measure TDS 200 Series Extension Module Instructions 29 TDS2MM Measurement Module Using the FFT The FFT process mathematically converts a time domain signal into its frequency components FFT waveforms are useful in the following applications 30 Testing impulse response of filters and systems Measuring harmonic content and distortion in systems Characterizing noise in DC power supplies Analyzing vibration Analyzing harmonics in 50 and 60 Hz power lines There are five steps to using the FFT 1 Set up the source time domain waveform 2 Display the FFT waveform 3 4 Select the FFT window type Adjust the sample rate to display fundamental frequency and harmonics without aliasing Use zoom controls and the cursors to magnify and measure the FFT waveform TDS 200 Series Extension Module Instructions TDS2MM Measurement Module Setting Up the Time Domain Waveform It is important to correctly set up the time domain YT waveform to produce a useable FFT waveform
10. line terminator string before sending more characters RS 232 Connector Pinout Diagram The following diagram shows the pin numbering and signal assignments for the TDS2CM RS 232 connector 1 No connection 2 Receive data RxD input 3 Transmit data TxD output 4 Data terminal ready DTR output 5 Signal ground GND 6 Data setready DSR input 7 Request to send RTS output 8 Clear to send CTS input 9 No connection 20 TDS 200 Series Extension Module Instructions TDS2CM Communications Module GPIB Setup This section describes how to set up and test the extension module GPIB interface GPIB is an 8 bit parallel communications standard that lets the oscilloscope communicate with an external device such as a controller computer terminal or printer Connecting to External GPIB Devices Follow these guidelines when you connect your oscilloscope to a GPIB network m Turn off the oscilloscope and all external devices before connecting the oscilloscope to the GPIB network m Connect the oscilloscope to the GPIB network Use an appropri ate GPIB cable You can stack cable connectors The following table lists cables that you can order to connect the oscilloscope to the GPIB network Tektronix Cable type part number GPIB 6 6 feet 2 meters 012 0991 00 GPIB 3 3 feet 1 meter 012 0991 01 m Assign a unique device address to the oscilloscope No two devices can share the same device address
11. The following section describes how to set the oscilloscope GPIB interface m Turn on at least two thirds of the GPIB devices while using the network TDS 200 Series Extension Module Instructions 21 TDS2CM Communications Module 22 GPIB Settings To set the oscilloscope GPIB interface 1 If you have not done so yet connect the oscilloscope to the GPIB network On the oscilloscope push UTILITY gt Options gt GPIB Setup Push the menu button next to the menu item to change the settings to assign a unique address to the oscilloscope The following table lists the settings you can change The oscilloscope stores these settings until you change them Turning off the oscilloscope does not erase these settings Menu Settings Comments Address 0 30 Sets oscilloscope GPIB bus address Bus Connection Talk listen Off bus Select Talk listen to turn on oscillo scope GPIB bus communications Select Off bus to turn off oscillo scope GPIB bus communications TDS 200 Series Extension Module Instructions TDS2CM Communications Module Testing the GPIB Interface To test the oscilloscope GPIB interface you will need to refer to the documentation that came with your controller The following procedure verifies communication with the oscillo scope by acquiring a signal and returning a voltage measurement This procedure assumes that the oscilloscope is connected to the GPIB network the oscillosc
12. connector for bent broken or missing pins If any pins are bent carefully straighten them out N Reinstall the extension module onto the oscilloscope 7 Turn on the oscilloscope If the oscilloscope still does not show the module installed contact the nearest Tektronix service center 6 TDS 200 Series Extension Module Instructions Getting Started Making a Hard Copy The extension modules have a hard copy feature that lets you print the oscilloscope screen data on a printer OL je RS 232 connector oC Centronics connector GPIB connector TDS 200 Series Extension Module Instructions 7 Getting Started Hard Copy Setup To setup the extension module do the following 1 Turn on the oscilloscope 2 Push UTILITY Options p gt Hard Copy Setup 3 Push the menu button next to the menu item to change the settings to match those of your printer device The following table lists the settings you can change The oscilloscope stores these settings until you change them Turning off the oscilloscope does not erase these settings Menu Settings Comments Layout Portrait Landscape Hard copy output orientation Format Epson Think et Desk et Type of device connected to Laser et BMP PCX the hard copy port EPSIMAGE INTERLEAF DPU4111 DPU4121 Port Centronics RS 232 GPIB Module port to which the printer is connected Abort Stops sending screen data to
13. male 012 1298 00 an HP Deskjet and Sun null modem workstations Telephone modems 9 pin female to 25 pin male 012 1241 00 modem TDS 200 Series Extension Module Instructions TDS2CM Communications Module Connecting an External Device Follow these guidelines when connecting the module to an external RS 232 device m Use the correct cable refer to the table on page 12 m Use acable that is no longer than 50 feet Turn off the oscilloscope and the external device before inserting the cable into the connectors m Connect the oscilloscope only to a DCE device m Check that the oscilloscope signal ground pin 5 is connected to the external device signal ground m Connect the chassis ground of the oscilloscope to the chassis ground of the external device TDS 200 Series Extension Module Instructions 13 TDS2CM Communications Module RS 232 Settings To set the oscilloscope RS 232 interface 1 Push UTILITY Options RS 232 2 Push the menu button next to the menu item to change settings to match those of the external device The following table lists the settings you can change The oscilloscope stores these settings until you change them Turning off the oscilloscope does not erase these settings Menu Comments Set to Sets the RS 232 interface to factory defaults defaults Baud 9600 Flow Hardflag EOL String LF Parity None Baud 300 600 1200 Sets the data transmission rate 2400 4800 9600
14. 6 or above Refer to Read Me First on page I for more information TDS 200 Series Extension Module Instructions 27 TDS2MM Measurement Module Changed Operations for TDS 210 and TDS 220 with Firmware Below V 2 00 The TDS2MM Module when used with a TDS 210 or TDS 220 firmware below V 2 00 changes the following math operations m The TDS2MM Module does not have the CH1 CH2 and CH2 CH1 math functions To do the same functions invert the channel you want to subtract using the CH1 or CH2 menu and then select the CH1 CH2 math function Default channel TDS2MM channel subtraction subtraction Commenis CH1 CH2 CH1 CH2 CH2 means invert channel 2 CH2 CH1 CH1 CH2 CH1 means invert channel 1 m The TDS2MM Module moves the channel invert function from the MATH menu to the Vertical CH1 and CH2 menus NOTE For all other TDS 200 series oscilloscopes and firmware versions addition and subtraction operations do not change 28 TDS 200 Series Extension Module Instructions TDS2MM Measurement Module Signal Measurements Push the MEASURE button to display the automated measurement menu The new measurements are in the Type menu The TDS2MM Module automatically determines the 10 50 and 90 waveform points Definition Type Rise Time Measures the time between 10 and 90 of the first Fall Time rising edge of the waveform Rising edge must be displayed to measure Measures the time between 90
15. Instructions TDS 200 Series Extension Modules 071 0409 01 NIAAA AA 071040901 Instructions Tektronix 7 TDS 200 Series Extension Modules 071 0409 01 This manual supports TDS2CM firmware version 1 04 and above and TDS2MM firmware version 1 00 and above when used with TDS 210 and TDS 220 firmware version 1 06 and above or TDS 224 firmware all versions Refer to Read Me First on page 1 for more information CE Copyright Tektronix Inc All rights reserved Tektronix products are covered by U S and foreign patents issued and pending Information in this publication supercedes that in all previously published material Specifications and price change privileges reserved Tektronix Inc P O Box 1000 Wilsonville OR 97070 1000 TEKTRONIX and TEK are registered trademarks of Tektronix Inc WARRANTY SUMMARY TDS2CM and TDS2MM Extension Modules Tektronix warrants that the products that it manufactures and sells will be free from defects in materials and workmanship for a period of three 3 years from the date of shipment from an authorized Tektronix distributor If a product proves defective within the respective period Tektronix will provide repair or replacement as described in the complete warranty statement To arrange for service or obtain a copy of the complete warranty statement please contact your nearest Tektronix sales and service office EXCEPT AS PROVIDED IN THIS SUMMARY OR THE APPLICABLE WARRA
16. NTY STATEMENT TEKTRONIX MAKES NO WARRANTY OF ANY KIND EXPRESS OR IMPLIED INCLUDING WITHOUT LIMITATION THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE IN NO EVENT SHALL TEKTRONIX BE LIABLE FOR INDIRECT SPECIAL OR CONSEQUENTIAL DAMAGES SSF Table of Contents General Safety Summary 0 cee ee cee ee eees ii Preface io56 ieiseis unne Sete ee E Meee ea eee ees saline iv CONVENUIONS 323 aA e aidan a Menke Aa ees iv Command Entry sa cities eet ens Bae oa ee ew dS v Contacting Tektronix ussen uran vi Getting Started ssis erai a E ERA 1 R ad Me First tarea T E a epee ee 1 Features a ake arta aye tag 2 Removing and Installing Modules 0 3 Checking Module Installation 00 0005 6 Troubleshooting Module Installation 6 Making a Hard Copy 02 0 c cece eee eee ee 7 TDS2CM Communications Module 2 10 RS2232 SCtup isin ats ce ehh ane ke ona be bal ptasad pale 11 GPIB Setup v0 eres ced e koani oe Geet bee eae A 21 TDS2MM Measurement Module 0685 27 Changed Operations for TDS 210 and TDS 220 with Firmware Below V 2 00 naa e ae a r E E 28 Signal Measurements 0 0000 eee cece eens 29 Using the FFT eraen ed ie ce ee e 30 Appendix A Certifications and Compliances 43 Appendix B Comparing GPIB and RS 232 44 Appendix C Manuals ccc cece cece ee ec
17. VOLTS DIV knob provides zoom factors of X0 5 X1 default X2 X5 and X10 The FFT waveform is vertically magnified about the M marker math waveform reference point on the left edge of the display The Vertical Position knob moves the FFT waveform up or down on the screen Rotate the knob clockwise to move the waveform up TDS 200 Series Extension Module Instructions 41 TDS2MM Measurement Module Measuring FFT Waveforms Using Cursors You can take two measurements on FFT waveforms magnitude in dB and frequency in Hz Magnitude is referenced to 0 dB where 0 dB equals 1 V RMS You can use the cursors to take measurements at any zoom factor Push CURSOR p Source and select Math Push the Type menu button to select between Magnitude and Frequency Use the Vertical Position knobs to move cursors 1 and 2 Use horizontal cursors to measure magnitude and vertical cursors to measure frequency The menu boxes display the delta between the two cursors the value at cursor position and the value at cursor 2 position Delta is the absolute value of cursor 1 minus cursor 2 Magnitude cursors Frequency cursors You can also do a frequency measurement by using the Horizontal Position knob to position a frequency component on the center graticule line and read the frequency at the top right of the display 42 TDS 200 Series Extension Module Instructions IEEE Appendix A Certifications and
18. at you are using the correct RS 232 cable Determine whether your external device requires a null modem or a straight through connection Refer to the table on page 12 for information about RS 232 cables Check that the RS 232 cable is firmly connected to both the oscilloscope and the correct port on the external device Check that the printer or the program on the personal computer is using the same port to which you connected the RS 232 cable Try your program or printer again Check that the oscilloscope RS 232 settings match the settings used by the external device a Determine the RS 232 settings for the external device b On the oscilloscope push UTILITY Options p RS 2372 c Set the oscilloscope to match the settings of the external device d Try your terminal emulator program or printer again Try setting both the oscilloscope and the external device to a slower baud rate TDS 200 Series Extension Module Instructions TDS2CM Communications Module RS 232 Conventions There are processing conventions that are specific to the RS 232 interface The next sections discuss transferring binary data processing break signals reporting RS 232 I O errors and checking command status Transferring Binary Data When using the RS 232 port to transfer binary data to the oscilloscope note the following points m Use hardware flagging RTS CTS whenever possible Hardware flagging guarantees no data loss
19. button to the right of the RS 232 menu item iv TDS 200 Series Extension Module Instructions Preface Command Entry Follow these general rules when entering oscilloscope commands over the RS 232 or GPIB bus You can enter commands in upper or lower case You can abbreviate many oscilloscope commands These abbreviations are shown in uppercase letters For example the command ACQuire NUMAVsg can be entered simply as ACQ NUMAV or acq numav You can precede any command with white space characters White space characters include any combination of the ASCII control characters 00 through 09 and OB through 20 hexadecimal 0 through 9 and 11 through 32 decimal The oscilloscope ignores commands that consist of just a combination of white space characters and line feeds Refer to the TDS 200 Series Digital Real Time Oscilloscope Programmer Manual 071 0493 XX for more information TDS 200 Series Extension Module Instructions V Preface Contacting Tektronix Product support Service support For other information To write us Web site vi For questions about using Tektronix measurement products call toll free in North America 1 800 TEK WIDE 1 800 835 9433 ext 2400 6 00 a m 5 00 p m Pacific time Or contact us by e mail tm_app_supp tek com For product support outside of North America contact your local Tektronix distributor or sales office Tektronix offers extended warranty and calibrati
20. eee 46 TDS 200 Series Extension Module Instructions i _ LL General Safety Summary Review the following safety precautions to avoid injury and prevent damage to this product or any products connected to it To avoid potential hazards use the product only as specified Only qualified personnel should perform service procedures While using this product you may need to access other parts of the system Read the General Safety Summary in other system manuals for warnings and cautions related to operating the system Injury Precautions Avoid Electric Overload To avoid electric shock or fire hazard do not apply a voltage to a terminal that is outside the range specified for that terminal Do Not Operate Without Covers To avoid electric shock or fire hazard do not operate this product with covers or panels removed Do Not Operate in Wet Damp Conditions To avoid electric shock do not operate this product in wet or damp conditions Do Not Operate in an Explosive Atmosphere To avoid injury or fire hazard do not operate this product in an explosive atmosphere ii TDS 200 Series Extension Module Instructions General Safety Summary Product Damage Precautions Do Not Operate With Suspected Failures If you suspect there is damage to this product have it inspected by qualified service personnel Safety Terms and Symbols Terms in This Manual These terms may appear in this manual IN CAUTION Caution statements
21. ension module TDS 200 Series Extension Module Instructions 3 Getting Started A Removing an Extension Module CAUTION Electrostatic discharge ESD can damage components in the extension module and the oscilloscope To prevent ESD follow the steps on page 3 when installing removing or handling the extension modules After removing a module install the dummy module cover to protect the contact pins TDS 200 Series Extension Module Instructions Getting Started Installing an Extension Module Make sure that you align the module connector to the oscilloscope connector pins before seating the module a i TDS 200 Series Extension Module Instructions 5 Getting Started Checking Module Installation To check that the extension module is correctly installed turn on the oscilloscope The power up screen should include the message Extension Module Passed If the oscilloscope does not recognize the extension module at power up do the steps in Troubleshooting Module Installation below Troubleshooting Module Installation If the oscilloscope does not recognize the extension module at power up do the following steps 1 Turn off the oscilloscope Follow the ESD precautions listed on page 3 2 3 Disconnect all cables from the extension module 4 Remove the extension module refer to page 4 5 Examine the oscilloscope option
22. es Extension Module Instructions TDS2CM Communications Module GPIB Network Conventions Follow these guidelines when you assemble your GPIB network m Connect the GPIB devices in a star linear or combination star linear network as shown in the following figure hor lt he paa TDS 200 Series Extension Module Instructions 25 TDS2CM Communications Module m Do not use loop or parallel configurations shown in the following figure elt a m The maximum number of devices in a network is 15 m The maximum cable length between any two devices is 6 6 feet 2 meters m The maximum cable length in the entire network is 65 feet 20 meters m Assign a unique device address to each device on the network No two devices can share the same device address 26 TDS 200 Series Extension Module Instructions y Rae ae nT TDS2MM Measurement Module This section describes the operation of the TDS2MM Measurement Extension Module The TDS2MM Module includes all of the communications capabilities of the TDS2CM Module described earlier in this manual and adds the following measurement capabilities m Rise time fall time positive pulse width and negative pulse width discussed in Signal Measurements on page 29 m Fast Fourier Transform FFT discussed in Using the FFT starting on page 30 NOTE To use the TDS2MM Module with a TDS 210 or TDS 220 be sure that the oscilloscope has firmware version 1 0
23. g Aliases Use the following methods to eliminate aliases m Increase the sample rate by adjusting the time division to a faster setting Since you increase the Nyquist frequency as you increase the sample rate the aliased frequency components should appear at their proper frequency If too many frequency components are shown on the screen use FFT Zoom to magnify the FFT waveform m Use a filter on the source signal to bandwidth limit the source waveform to frequencies below that of the Nyquist frequency m Recognize and ignore the aliased frequencies TDS 200 Series Extension Module Instructions TDS2MM Measurement Module Horizontal Zoom and Position The FFT Zoom menu lets you horizontally magnify the FFT waveform without changing the sample rate Zoom factors are X1 default X2 X5 and X10 At zoom factor X1 and with the waveform centered in the graticule the left graticule line is at 0 Hz and the right graticule line is at the Nyquist frequency When you change the zoom factor the FFT waveform is magnified about the center graticule line In other words the axis of horizontal magnification is the center graticule line The Horizontal Position knob moves the FFT waveform left or right on the screen Rotate the knob clockwise to move the waveform to the right Vertical Zoom and Position The channel vertical knobs become zoom and position controls for their respective channels when displaying the FFT waveform The
24. identify conditions or practices that could result in damage to this product or other property Terms on the Product These terms may appear on the product DANGER indicates an injury hazard immediately accessible as you read the marking WARNING indicates an injury hazard not immediately accessible as you read the marking CAUTION indicates a hazard to property including the product Symbols on the Product These symbols may appear on the product A A m DANGER Protective Ground ATTENTION Double High Voltage Earth Terminal Refer to Manual Insulated TDS 200 Series Extension Module Instructions iii Sy es Preface These instructions describe how to install set up and test the TDS2CM and TDS2MM Extension modules This manual presumes that you understand how to operate the TDS 200 Series oscilloscope Conventions This manual uses the following conventions m Labeled oscilloscope panel buttons are shown in the manual in all uppercase letters For example UTILITY HARDCOPY m On screen menu items are shown in the manual with the first letter of each menu word in upper case For example Options Recall Factory A list of panel buttons separated by the symbol represents the order in which to push the listed buttons For example UTILITY Options RS 232 means that you first push the UTILITY panel button then push the side menu button to the right of the Options menu item and then push the side menu
25. ment Module ol je RS 232 connector oC Ss Centronics connector GPIB connector 10 TDS 200 Series Extension Module Instructions TDS2CM Communications Module RS 232 Setup This section describes how to set up and test the extension module RS 232 interface RS 232 is an 8 bit serial communications standard that lets the oscilloscope communicate with an external RS 232 device such as a computer terminal or printer The standard defines two device types Data Terminal Equipment DTE and Data Communications Equipment DCE The TDS 200 Series oscilloscope is a DTE device RS 232 Conventions on page 19 describes RS 232 conventions RS 232 Connector Pinout Diagram on page 20 shows a diagram of the 9 pin RS 232 connector with its pin numbers and signal assignments TDS 200 Series Extension Module Instructions 11 TDS2CM Communications Module Selecting an RS 232 Cable You will need an RS 232 cable to connect the oscilloscope to an external device Use the following table to choose the correct cable to connect the module to your RS 232 equipment To connect the oscilloscope to PC AT or laptop computers Tektronix part You need this type cable number 9 pin female to 9 pin female null 012 1379 00 modem PCs with 25 pin serial 9 pin female to 25 pin female null 012 1380 00 port connector modem Serial printers suchas 9 pin female to 25 pin
26. on programs as options on many products Contact your local Tektronix distributor or sales office For a listing of worldwide service centers visit our web site In North America 1 800 TEK WIDE 1 800 835 9433 An operator will direct your call Tektronix Inc P O Box 1000 Wilsonville OR 97070 1000 USA www Tektronix com TDS 200 Series Extension Module Instructions a as Getting Started This chapter describes important module and oscilloscope dependen cies and how to install and check the TDS 200 Series extension modules Read Me First NOTE Read the following text before installing your module To display oscilloscope and module firmware version numbers press UTILITY gt System Status p gt Misc TDS2MM and TDS 200 Series The TDS2MM Module operates with TDS 210 and TDS 220 with firmware version 1 06 and above and with TDS 224 firmware all versions Contact Tektronix for information on how to upgrade your TDS 200 Series oscilloscope firmware Seiko Printer Support Seiko printer support DPU411 DPU412 is only available with the following firmware configurations Module and firmware TDS 210 220 firmware TDS2CM v1 04 and above v1 09 and above TDS2MM v1 00 and above v1 06 and above All 1 You cannot select the DPU411 or DPU412 over a remote interface with TDS2CM v1 03 and below TDS 224 firmware TDS 200 Series Extension Module Instructions 1 Getting Started
27. oom Settings Hanning Flattop Rectangular X1 X2 X5 X10 Firmware below V 2 00 Comments Displays sum of channel 1 and 2 signals refer to Changed Math Operations for the TDS 210 and TDS 220 on page 28 Switches between the channel 1 FFT and YT waveforms selected FFT Switches between the channel 2 FFT and YT waveforms selected FFT Selects the FFT window type Changes the horizontal magnification of the FFT display TDS 200 Series Extension Module Instructions 33 TDS2MM Measurement Module 34 TDS 210 TDS 220 and TDS 224 Menu Comments Operation Selects the math operation Selects the channel used as the FFT source Window Hanning Selects the FFT window type Flattop Rectangular FFT Zoom X1 Changes the horizontal magnification X2 of the FFT display X5 X10 Firmware V 2 00 and above t TDS 224 only The FFT Display cHtecue Frequency component Window FFT Zoom Pry an Teen 1 00 MS s Hanning CH1 10dB 50 0 kHz X AEN TNS 2 3 4 5 TDS 210 and TDS 220 firmware below V 2 00 TDS 200 Series Extension Module Instructions TDS2MM Measurement Module Me Trig dPos 250 0 KHZ MATH J Operation Frequency component window Hanning FFT Zoom 1 00 Hanning CH1 10dB 50 0 kH x z POR IN 2 3 4 5 TDS 210 and TDS 220 firmware V 2 00 and above and TDS 224 firmware all versions
28. ope has been assigned a unique bus address and that the controller software is running To test the GPIB interface 1 Connect the oscilloscope probe to the channel input connector Attach the probe tip and ground lead to the PROBE COMP connectors The figure on the next page shows how to hook up the probe to the oscilloscope The PROBE COMP signal is a square wave with a frequency of 1 kHz and a peak voltage of 5 V 2 In the controller software send the ID command to the oscilloscope The oscilloscope should send back its identification string which looks similar to the following ID TEK TDS 220 CF 91 1CT FV V1 09 TDS2CM CMV V1 04 TDS 200 Series Extension Module Instructions 23 TDS2CM Communications Module 24 DS 200 Series Digitizing oscilloscope PROBE COMP CH 1 connector Send the command FACtory to reset the oscilloscope to factory settings Send the command AUTOSet EXECute to have the oscilloscope automatically acquire the input signal Send the command MEASUrement I MMed SOURCE CH1 to select measurements on channel 1 Send the command MEASUrement IMMed TYPe PK2 to set up the voltage measurement Send the query MEASUrement MMed VALue to request the measurement result The oscilloscope will respond with a result similar to 5 160 which is the voltage measurement of the PROBE COMP signal using the standard 10x probe This completes the GPIB interface test TDS 200 Seri
29. serial Interface control Interface messages Interrupts reported Operator low level con None trol message Most IEEE 488 Std Device clear using a break signal Service requests status and event code status None must be polled for 44 TDS 200 Series Extension Module Instructions Appendix B Comparing GPIB and RS 232 Operating Attribute Message termination Message termination Transmit LF Timing Asynchronous Hardware EOL Receive software LF or both Hardware EOL software Software CR LF CRLF RS 232 Software CR LF CRLF LFCR LFCR Asynchronous Transmission path length lt 2 meters between max devices lt 20 meters total cabling Speed 200 kBytes sec Multiple devices lt 15 System environment lt 15 meters 19 200 bits sec Single terminal point to point connection TDS 200 Series Extension Module Instructions 45 SSS Appendix C Manuals TDS 200 Series Digital Oscilloscope Service Manual The service manual 071 0492 XX English provides module level repair information TDS 200 Series Digital Oscilloscope User Manuals The User manual is available in these languages English 071 0398 XX French 071 0400 X X Italian 071 0401 XX Eee eee German 071 0402 XX Seee Spanish 071 0399 XX Bee Nl Japanese 071 0405 XX O 88
30. ttings match those listed in the table on page 15 8 From your PC terminal program type ID then press the RETURN key to send the command The oscilloscope sends back its identification string which should look similar to the following ID TEK TDS 220 CF 91 1CT FV V1 09 TDS2CM CMV V1 04 If you do not get any response refer to the troubleshooting steps that start on page 18 9 Send the command FACtory to reset the oscilloscope to factory settings 10 Send the command AUTOSet EXECute to have the oscilloscope automatically acquire the input signal TDS 200 Series Extension Module Instructions TDS2CM Communications Module 11 Send the command MEASUrement IMMed SOURCE CH1 to select measurements on channel 1 12 Send the command MEASUrement IMMed TYPe PK2 to set up the voltage measurement 13 Send the query MEASUrement IMMed VALue to request the measurement result The oscilloscope will respond with a result similar to 5 16E0 which is the voltage measurement of the PROBE COMP signal using the standard 10x probe This completes the RS 232 interface test TDS 200 Series Extension Module Instructions 17 TDS2CM Communications Module RS 232 Troubleshooting If the oscilloscope and the external device personal computer or printer have trouble communicating use the following steps to correct the problem 1 Verify that the module is working Refer to Checking Module Installation on page 6 Check th
31. uctions 37 TDS2MM Measurement Module 38 Selecting an FFT Window The TDS2MM Module provides three FFT windows Each window is a trade off between frequency resolution and amplitude accuracy What you want to measure and your source signal characteristics help determine which window to use Use the following guidelines to select the best window Window Characteristics Hanning Periodic Better frequency poorer magnitude waveforms accuracy than Flattop F lattop Periodic Better magnitude poorer frequency waveforms accuracy than Hanning Rectangular Pulses or Special purpose window for waveforms that transients do not have discontinuities This is essen tially the same as no window TDS 200 Series Extension Module Instructions TDS2MM Measurement Module Aliasing Problems occur when the oscilloscope acquires a time domain waveform containing frequency components that are greater than the Nyquist frequency refer to Nyquist Frequency on page 32 The frequency components that are above the Nyquist frequency are undersampled appearing as lower frequency components that fold back around the Nyquist frequency These incorrect components are called aliases i lt Nyquist frequency 1 one half sample rate Lob oyu Frequency A 4 A Pah i Aliased frequencies Actual frequencies eke 4 TDS 200 Series Extension Module Instructions 39 TDS2MM Measurement Module 40 Eliminatin
32. y The highest frequency that any real time digitizing oscilloscope can measure without errors is one half the sample rate This frequency is called the Nyquist frequency Frequency information above the Nyquist frequency is undersampled causing a situation known as aliasing refer to Aliasing on page 39 The TDS2MM Module transforms the center 2048 points of the time domain waveform into an FFT waveform The resulting FFT waveform contains 1024 points that go from DC 0 Hz to the Nyquist frequency Normally the display compresses the FFT waveform horizontally into 250 points but you can use the FFT Zoom function to expand the FFT waveform to more clearly see the frequency components at each of the 1024 data points in the FFT waveform NOTE The oscilloscope bandwidth rolls off slowly above 20 MHz Bandwidth Limit ON 60 MHz TDS 210 or 100 MHz TDS 220 and TDS 224 Therefore the FFT waveform can show valid frequency information higher than the oscilloscope bandwidth However the magnitude information above the bandwidth will not be accurate TDS 200 Series Extension Module Instructions TDS2MM Measurement Module Displaying the FFT Waveform Push the MATH button to display the math menu Use the menu buttons to select the FFT source channel window algorithm and display magnification You can display only one FFT waveform at a time TDS 210 amp TDS 220 Menu CH1 CH2 FFT CH1 FFT CH2 Window FFT Z
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