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instructions tds 200-series extension modules 070-9565-04 this document supports tds 200-series firmware version 1.06 and greater, tds2hm firmware all versions, tds2cm firmware version 1.04 and greater, and tds2mm firmware version 1.00 and greater. refer to read me first on page 1 for more information. free datasheet http://www.ndatasheet.com
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. printed in the u.s.a. tektronix, inc., p.o. box 1000, wilsonville, or 970701000 tektronix and tek are registered trademarks of tektronix, inc. free datasheet http://www.ndatasheet.com
warranty summary (tds2hm, 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 warranty 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. free datasheet http://www.ndatasheet.com
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tds 200-series extension module instructions i table of contents general safety summary ii . . . . . . . . . . . . . . . . . . . . . . . . . . . . preface iv . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . conventions iv . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . command entry v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . contacting tektronix vi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . getting started 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . dependencies 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . features 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . removing and installing modules 3 . . . . . . . . . . . . . . . . . . . . . . . checking module installation 6 . . . . . . . . . . . . . . . . . . . . . . . . . . troubleshooting module installation 6 . . . . . . . . . . . . . . . . . . . . . tds2hm hard copy module 7 . . . . . . . . . . . . . . . . . . . . . . . . hard copy setup 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . testing the hard copy port 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . printing an oscilloscope screen 9 . . . . . . . . . . . . . . . . . . . . . . . . tds2cm communications module 10 . . . . . . . . . . . . . . . . . . . . rs-232 setup 11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . gpib setup 21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . tds2mm measurement module 27 . . . . . . . . . . . . . . . . . . . . . . changed math operations 28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . signal measurements 29 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . using the fft 30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . appendix a: certifications and compliances 42 . . . . . . . . . . . . appendix b: comparing gpib and rs-232 43 . . . . . . . . . . . . . appendix c: manuals 45 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . free datasheet http://www.ndatasheet.com
ii tds 200-series extension module instructions 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. free datasheet http://www.ndatasheet.com
general safety summary tds 200-series extension module instructions iii 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: caution. caution statements 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: protective ground (earth) terminal attention refer to manual double insulated danger high voltage free datasheet http://www.ndatasheet.com
iv tds 200-series extension module instructions preface these instructions describe how to install, set up, and test the tds2cm, tds2hm, 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: labeled oscilloscope panel buttons are shown in the manual in all uppercase letters. for example: utility, hardcopy. 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 button to the right of the rs-232 menu item. free datasheet http://www.ndatasheet.com
preface tds 200-series extension module instructions v 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:numavg 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 0b 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. free datasheet http://www.ndatasheet.com
preface vi tds 200-series extension module instructions contacting tektronix product support for application-oriented questions about a tektronix measurement product, 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. service support contact your local tektronix distributor or sales office. or visit our web site for a listing of worldwide service locations. http://www.tek.com/measurement for other information in north america: 1-800-tek-wide (1-800-835-9433) an operator will direct your call. to write us tektronix, inc. p.o. box 1000 wilsonville, or 97070-1000 free datasheet http://www.ndatasheet.com
tds 200-series extension module instructions 1 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 system status misc. tds2mm and tds 200-series the tds2mm module only operates on tds 200-series oscillo- scopes with firmware version v1.06 and greater. 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 200 firmware tds2hm v1.00 and greater v1.09 and greater tds2cm v1.04 and greater 1 v1.09 and greater tds2mm v1.00 and greater v1.06 and greater 1 you cannot select the dpu411 or dpu412 over a remote interface with tds2cm v1.03 and earlier. free datasheet http://www.ndatasheet.com
getting started 2 tds 200-series extension module instructions features the following table lists the module features. module centronics rs-232 gpib fft, rise/fall time, pos/neg pulse width tds2hm tds2cm tds2mm free datasheet http://www.ndatasheet.com
getting started tds 200-series extension module instructions 3 removing and installing modules 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: 1. always turn off the oscilloscope before removing or installing extension modules. 2. handle extension modules as little as possible. 3. transport and store extension modules in a static-protected bag or container. 4. do not slide the extension module over any surface 5. wear a grounded antistatic wrist strap to discharge the static voltage from your body while installing or removing an extension module from the oscilloscope. 6. do not touch the oscilloscope extension module connector pins. 7. do not use any devices capable of generating or holding a static charge in the work area where you install or remove extension modules. 8. avoid handling modules in areas that have a floor or work-sur- face covering capable of generating a static charge. 9. make sure that you install the extension module cover after you remove an extension module. free datasheet http://www.ndatasheet.com
getting started 4 tds 200-series extension module instructions 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. 1 2 3 free datasheet http://www.ndatasheet.com
getting started tds 200-series extension module instructions 5 installing an extension module make sure that you align the module connector to the oscilloscope connector pins before seating the module. 1 5 3 4 2 free datasheet http://www.ndatasheet.com
getting started 6 tds 200-series extension module instructions checking module installation to check that the extension module is correctly installed, turn on the oscilloscope. the powerup screen should include the message oextension module passedo. 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. 2. follow the esd precautions listed on page 3. 3. disconnect all cables from the extension module. 4. remove the extension module (refer to page 4). 5. examine the oscilloscope option connector for bent, broken, or missing pins. if any pins are bent, carefully straighten them out. 6. 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. free datasheet http://www.ndatasheet.com
tds 200-series extension module instructions 7 tds2hm hard copy module the tds2hm module lets you print the oscilloscope screen data on a printer. this chapter describes how to set up and test the tds2hm hard copy extension module. this information also applies to the hard copy portion of the tds2cm communications module and the tds2mm measurement module. centronics connector free datasheet http://www.ndatasheet.com
tds2hm hard copy module 8 tds 200-series extension module instructions hard copy setup to setup the tds2hm module, do the following: 1. turn on the oscilloscope. 2. push utility options 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, thinkjet, deskjet, laserjet, bmp, pcx, epsimage, interleaf, dpu411 1 , dpu412 1 type of device connected to the hard copy port port (tds2cm and tds2mm only) centronics, rs-232, gpib module port to which the printer is connected abort hardcopy stops sending screen data to the hard copy device 1 refer to read me first on page 1 for more seiko printer information. free datasheet http://www.ndatasheet.com
tds2hm hard copy module tds 200-series extension module instructions 9 testing the hard copy port 1. if you have already connected the oscilloscope to a printer, go to step 4. 2. turn off the oscilloscope and the printer. 3. connect the oscilloscope to the printer using the appropriate cable. 4. turn on the oscilloscope and the printer. 5. if you have not done so already, do the hard copy setup appropriate for your extension module. refer to page 8. 6. 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. free datasheet http://www.ndatasheet.com
10 tds 200-series extension module instructions 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 includes all features of the tds2hm module, described in tds2hm hard copy module starting on page 7. this information also applies to the communications portion of the tds2mm measurement module. rs-232 connector gpib connector centronics connector free datasheet http://www.ndatasheet.com
tds2cm communications module tds 200-series extension module instructions 11 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. free datasheet http://www.ndatasheet.com
tds2cm communications module 12 tds 200-series extension module instructions 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 you need this type cable tektronix part number pc/at or laptop computers 9-pin female to 9-pin female, null modem 012-1379-00 pcs with 25-pin serial port connector 9-pin female to 25-pin fe- male, null modem 012-1380-00 serial printers, such as an hp deskjet, and sun workstations 9-pin female to 25-pin male, null modem 012-1298-00 telephone modems 9-pin female to 25-pin male, modem 012-1241-00 free datasheet http://www.ndatasheet.com
tds2cm communications module tds 200-series extension module instructions 13 connecting an external device follow these guidelines when connecting the module to an external rs-232 device: use the correct cable (refer to the table on page 12). use a cable that is no longer than 50 feet. turn off the oscilloscope and the external device before inserting the cable into the connectors. connect the oscilloscope only to a dce device. check that the oscilloscope signal ground (pin 5) is connected to the external device signal ground. connect the chassis ground of the oscilloscope to the chassis ground of the external device. free datasheet http://www.ndatasheet.com
tds2cm communications module 14 tds 200-series extension module instructions 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 settings comments set to defaults sets the rs-232 interface to factory defaults (baud=9600, flow=hardflag, eol string=lf, parity=none). baud 300, 600, 1200, 2400, 4800, 9600, 19200 sets the data transmission rate. flow control hardflag, softflag, none sets data flow control (softflag=xon/ xoff, hardflag= rts/cts). use hardware flagging when transfer- ring binary data. eol string cr, lf, cr/lf, lf/cr sets the end-of-line terminator sent by the oscilloscope. parity none, even, odd adds an error check bit (ninth bit) to each character. free datasheet http://www.ndatasheet.com
tds2cm communications module tds 200-series extension module instructions 15 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). 2. turn on the pc. 3. on the pc, run a terminal-emulator program such as the microsoft windows terminal. make sure the pc serial port is set as follows: function setting baud rate 9600 data flow control hardflag parity none eol string lf 4. turn on the oscilloscope. 5. 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. free datasheet http://www.ndatasheet.com
tds2cm communications module 16 tds 200-series extension module instructions tds 200 series digitizing oscilloscope probe comp ch 1 connector 6. on the oscilloscope, push utility options rs-232. 7. check that the menu settings 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:

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. free datasheet http://www.ndatasheet.com
tds2cm communications module tds 200-series extension module instructions 17 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 , which is the voltage measurement of the probe comp signal using the standard 10x probe. this completes the rs-232 interface test. free datasheet http://www.ndatasheet.com
tds2cm communications module 18 tds 200-series extension module instructions 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. 2. check that 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. 3. check that the rs-232 cable is firmly connected to both the oscilloscope and the correct port on the external device. 4. 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. 5. 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 rs-232. c. set the oscilloscope to match the settings of the external device. d. try your terminal-emulator program or printer again. 6. try setting both the oscilloscope and the external device to a slower baud rate. free datasheet http://www.ndatasheet.com
tds2cm communications module tds 200-series extension module instructions 19 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: use hardware flagging (rts/cts) whenever possible. hardware flagging guarantees no data loss. 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. free datasheet http://www.ndatasheet.com
tds2cm communications module 20 tds 200-series extension module instructions 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 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 of 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 set ready (dsr) (input) 7 request to send (rts) (output) 8 clear to send (cts) (input) 9 no connection 1234 5 67 89 free datasheet http://www.ndatasheet.com
tds2cm communications module tds 200-series extension module instructions 21 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: turn off the oscilloscope and all external devices before connecting the oscilloscope to the gpib network. 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. cable type tektronix part number gpib, 6.6 feet (2 meters) 012-0991-00 gpib, 3.3 feet (1 meter) 012-0991-01 assign a unique device address to the oscilloscope. no two devices can share the same device address. the following section describes how to set the oscilloscope gpib interface. turn on at least two-thirds of the gpib devices while using the network. free datasheet http://www.ndatasheet.com
tds2cm communications module 22 tds 200-series extension module instructions gpib settings to set the oscilloscope gpib interface: 1. if you have not done so yet, connect the oscilloscope to the gpib network. 2. on the oscilloscope, push utility options gpib setup. 3. 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. free datasheet http://www.ndatasheet.com
tds2cm communications module tds 200-series extension module instructions 23 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 oscilloscope 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 1 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:

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tds2cm communications module 24 tds 200-series extension module instructions tds 200 series digitizing oscilloscope probe comp ch 1 connector 3. send the command factory to reset the oscilloscope to factory settings. 4. send the command autoset execute to have the oscilloscope automatically acquire the input signal. 5. send the command measurement:immed:source ch1 to select measurements on channel 1. 6. send the command measurement:immed:type pk2 to set up the voltage measurement. 7. send the query measurement:immed:value? to request the measurement result. the oscilloscope will respond with a result similar to , which is the voltage measurement of the probe comp signal using the standard 10x probe. this completes the gpib interface test. free datasheet http://www.ndatasheet.com
tds2cm communications module tds 200-series extension module instructions 25 gpib network conventions follow these guidelines when you assemble your gpib network: connect the gpib devices in a star, linear, or combination star/linear network, as shown in the following figure. free datasheet http://www.ndatasheet.com
tds2cm communications module 26 tds 200-series extension module instructions do not use loop or parallel configurations (shown in the following figure). the maximum number of devices in a network is 15. the maximum cable length between any two devices is 6.6 feet (2 meters). the maximum cable length in the entire network is 65 feet (20 meters). assign a unique device address to each device on the network. no two devices can share the same device address. free datasheet http://www.ndatasheet.com
tds 200-series extension module instructions 27 tds2mm measurement module this section describes the operation of the tds2mm measurement extension module. the tds2mm module includes all communica- tions capabilities of the tds2cm module, and adds these new measurement capabilities to the tds 200-series oscilloscopes: rise time, fall time, positive pulse width, and negative pulse width (discussed in signal measurements , on page 29) fast fourier transform (fft) (discussed in using the fft , starting on page 30) free datasheet http://www.ndatasheet.com
tds2mm measurement module 28 tds 200-series extension module instructions changed math operations the tds2mm module changes the following math operations: the tds2mm module does not have the ch1ch2 and ch2ch1 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 subtraction tds2mm channel subtraction comments ch1ch2 ch1+(ch2) (ch2) means invert channel 2 ch2ch1 (ch1)+ch2 (ch1) means invert channel 1 the tds2mm module moves the channel invert function from the math menu to the vertical ch1 and ch2 menus. free datasheet http://www.ndatasheet.com
tds2mm measurement module tds 200-series extension module instructions 29 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. type definition rise time measures the time between 10% and 90% of the first rising edge of the waveform. rising edge must be displayed to measure. fall time measures the time between 90% and 10% of the first falling edge of the waveform. falling edge must be displayed to measure. pos 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. neg width 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. free datasheet http://www.ndatasheet.com
tds2mm measurement module 30 tds 200-series extension module instructions using the fft the fft process mathematically converts a time-domain signal into its frequency components. fft waveforms are useful in the following applications: 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. select the fft window type 4. adjust the sample rate to display fundamental frequency and harmonics without aliasing 5. use zoom controls and the cursors to magnify and measure the fft waveform free datasheet http://www.ndatasheet.com
tds2mm measurement module tds 200-series extension module instructions 31 setting up the time-domain waveform it is important to correctly set up the time-domain (yt) waveform to produce a useable fft waveform. 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 38 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. free datasheet http://www.ndatasheet.com
tds2mm measurement module 32 tds 200-series extension module instructions nyquist frequency 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 38). 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). 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. free datasheet http://www.ndatasheet.com
tds2mm measurement module tds 200-series extension module instructions 33 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. menu settings comments math ch1+ch2 displays sum of channel 1 and 2 signals (refer to changed math operations on page 28) fft ch1 switches between the channel 1 fft and yt waveforms (selected = fft) fft ch2 switches between the channel 2 fft and yt waveforms (selected = fft) window selects the fft window type (hanning, flattop, rectangular) fft zoom changes the horizontal magnification of the fft display (x1, x2, x5, x10) free datasheet http://www.ndatasheet.com
tds2mm measurement module 34 tds 200-series extension module instructions the fft display "
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# 1 234 5 frequency component 1. frequency at the center graticule line 2. vertical scale in db per division (0 db = 1 v rms ) 3. horizontal scale in frequency per division 4. sample rate in number of samples per second 5. fft window type free datasheet http://www.ndatasheet.com
tds2mm measurement module tds 200-series extension module instructions 35 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 without windowing fft discontinuities center 2048 data points free datasheet http://www.ndatasheet.com
tds2mm measurement module 36 tds 200-series extension module instructions 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 yt waveform after windowing window function (hanning) fft = point-by-point multiply with windowing center 2048 data points free datasheet http://www.ndatasheet.com
tds2mm measurement module tds 200-series extension module instructions 37 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 measure characteristics hanning periodic waveforms better frequency, poorer magnitude accuracy than flattop. flattop periodic waveforms better magnitude, poorer frequency accuracy than hanning. rectangular pulses or transients special-purpose window for waveforms that do not have discontinuities. this is essen- tially the same as no window. free datasheet http://www.ndatasheet.com
tds2mm measurement module 38 tds 200-series extension module instructions 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 afold backo around the nyquist frequency. these incorrect components are called aliases. nyquist frequency (one-half sample rate) frequency amplitude aliased frequencies actual frequencies free datasheet http://www.ndatasheet.com
tds2mm measurement module tds 200-series extension module instructions 39 eliminating aliases use the following methods to eliminate aliases: 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. use a filter on the source signal to bandwidth limit the source waveform to frequencies below that of the nyquist frequency. recognize and ignore the aliased frequencies. free datasheet http://www.ndatasheet.com
tds2mm measurement module 40 tds 200-series extension module instructions 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 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. free datasheet http://www.ndatasheet.com
tds2mm measurement module tds 200-series extension module instructions 41 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 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 1 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. free datasheet http://www.ndatasheet.com
42 tds 200-series extension module instructions appendix a: certifications and compliances the tds 200-series extension modules meet the following certifications and compliances. certifications and compliances ec declaration of conformity meets intent of directive 89/336/eec for electromagnetic compatibility for product safety. compliance was demonstrated to the following specifications as listed in the official journal 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/burst immunity iec 801-5 power line surge immunity u.s. certifications fcc 47 cfr part 15, subpart b, class a australia/new zealand declaration of conformity meets intent of australian radiocommunications act of 1992. compliance demonstrated and declared for the following specification: as/nzs 2064.1/2 industrial, scientific, and medical equipment free datasheet http://www.ndatasheet.com
tds 200-series extension module instructions 43 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 gpib rs-232 cable ieee-488 std. 9-wire data flow control hardware, 3-wire hand- shake flagging: soft (xon/xoff), hard (rts/cts) data format 8-bit parallel 8-bit serial interface control operator low-level con- trol message none interface messages most ieee-488 std. device clear using a break signal interrupts reported service requests, status and event code none, must be polled for status free datasheet http://www.ndatasheet.com
appendix b: comparing gpib and rs-232 44 tds 200-series extension module instructions operating attribute rs-232 gpib message termination (receive) hardware eol, software lf, or both software cr, lf, crlf, lfcr message termination (transmit) hardware eol, software lf software cr, lf, crlf, lfcr timing asynchronous asynchronous transmission path length (max) 2 meters between devices; 20 meters total cabling 15 meters speed 200 kbytes/sec 19,200 bits/sec system environment multiple devices ( 15) single terminal (point-to- point connection) free datasheet http://www.ndatasheet.com
tds 200-series extension module instructions 45 appendix c: manuals tds 210 & tds 220 service manual. the service manual (english 070-9693-xx) provides module level repair information. tds 210 & tds 220 user manuals. the user manual is available in these languages: english 070-8483-xx french 070-8520-xx * german 070-8484-xx * italian 070-8980-xx * spanish 070-9560-xx * portuguese 070-9561-xx * japanese 070-9562-xx korean 070-9564-xx simplified chinese 070-9563-xx traditional chinese 070-9568-xx *these manuals contain a language overlay for the front-panel controls. tds 200-series extension module instructions. the module instructions are available in these languages: english 070-9565-xx french 070-9567-xx german 070-9566-xx italian 070-9569-xx spanish 070-9570-xx portuguese 070-9571-xx japanese 070-9572-xx korean 070-9575-xx simplified chinese 070-9573-xx traditional chinese 070-9574-xx free datasheet http://www.ndatasheet.com
appendix c: manuals 46 tds 200-series extension module instructions tds 200-series two channel digital oscilloscope programmer manual. the programmer manual (english 070-9576-xx) provides command syntax for remote control of the tds 200-series oscilloscope. free datasheet http://www.ndatasheet.com

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