TDS3TMT Telecom Mask Test Application Module User Manual
Contents
1. SAVE RECALL gt Recall Factory Setup menu 2 Set the Graticule type to Frame DISPLAY gt Graticule menu Select the mask standard Turn off all waveforms not being tested Connect the appropriate input signals Push the Autoset button Set Autofit to a reasonably small value such as 4 Set Polarity to Both Set the number of Waveforms to 100 10 Run the pass fail test 11 Note the pass fail test status Passed or Failed and take appropriate action o Ono Fw 12 Connect new signals 13 Repeat from step 10 23 Telecom Pass Fail Mask Test Example In this example you want to test an ITU T telecom signal that needs to meet the E1 Coaxial Pair 2 048 Mb s standard You want to highlight any waveform mask errors as well as set up pass fail testing to test 500 waveforms then stop Use the Telecom QuickMenu to set the TDSITMT mask parameters as listed in the table Connect the signal to CH 1 on the oscilloscope then press the AUTOSET front panel button After Autoset completes press the Run Test side menu button to perform the pass fail test Telecom QuickMenu Standard Use buttons to scroll E1 Coax ITU T through mask stan 2 048 Mb s dard list Convoi Highight TOn Average Off Wfm Lock Off Autofit On 1 24 Telecom QuickMenu cont Pass Fail Send hardcopy to Off unchecked printer Send waveform to file Off unchecked Beep on failure On checked Beep on completion On chec2. 1 Utility Menu Type Apps Module Telecom cont Bottom Current Mask Side Description Status area that displays the name of the currently se lected mask Mask Control Highlight Violations On Off Turns on mask violation highlighting Waveforms that violate mask parameters leave highlighted points on the mask that are the color of the failing waveform Stop On Violation On Off When set to On the oscillo scope stops mask testing on the first occurrence of a waveform violation This function overrules pass fail tests Lock Mask To Waveform On Off Locks mask to waveform so that the mask segments move and redraw proportion ally when changing the horizontal or vertical scale or position settings Autofit Search Radius Autofit repositions the wave form using a spiral algorithm to attempt to fit the wave form to a mask 11 Table 1 Utility Menu Type Apps Module Telecom cont Bottom Side Description Mask Vertical Margin When enabled adjusts the Control Percentage User mask vertical margins User mask only as a percent of the nominal waveform amplitude for the mask standard Pass Pass Fail Mask Test When set to On resets the Fail On Off status information and starts Mask mask testing Test Status Displays pass fail test status information the number of waveforms that have violated the mask per number of waveforms tested in th
3. 12 13 24 1 2 3 14 23 8 s 4 15 22 7 6 5 16 21 20 19 18 17 m If pass fail testing is used in conjunction with Autofit the Autofit center point is reset at the beginning of each pass fail test m Autofit is most appropriate when the waveform s being tested is already close to fitting inside the mask 21 22 When Autofit moves the waveform it only moves the location where the waveform is drawn on the display It does not change any of the underlying vertical horizontal or trigger parameters used to acquire the waveform A consequence of this is that when moving the waveform left or right the waveform points at the right or left edge of the screen will be blank if the horizontal settings are such that the entire acquired waveform is displayed on screen This is acceptable because those points are typically outside the mask region If the waveform is a significant distance from the mask AUTOSET should be used first to adjust the vertical horizontal and trigger parameters When numerous waveforms are violating the mask by substantial amounts thereby causing Autofit to run almost continuously the instrument responsiveness is significantly degraded This is another reason why AUTOSET is more appropriate than Autofit for waveforms which violate the mask by large amounts Automated Pass Fail Testing Process The recom mended automated pass fail testing process is 1 Set the oscilloscope to default settings using the
4. system manuals for warnings and cautions related to operating the system Preventing Electrostatic Damage CAUTION Electrostatic discharge ESD can damage components in the oscilloscope and its accessories To prevent ESD observe these precautions when directed to do so Use a Ground Strap Wear a grounded antistatic wrist strap to discharge the static voltage from your body while installing or removing sensitive components Use a Safe Work Area Do not use any devices capable of generating or holding a static charge in the work area where you install or remove sensitive components Avoid handling sensitive components in areas that have a floor or benchtop surface capable of generating a static charge Handle Components Carefully Do not slide sensitive components over any surface Do not touch exposed connector pins Handle sensitive components as little as possible Transport and Store Carefully Transport and store sensitive components in a static protected bag or container Manual Storage The oscilloscope front cover has a convenient place to store this manual SS as LG Installing the TDS3TMT Application Module Refer to the TDS3000 TDS3000B and TDS3000C Series Application Module Installation manual for instructions on installing and testing the application module Telecom Mask Test Features The TDS3TMT application module adds waveform mask testing capabilities to your oscilloscope This section provide
5. TMT Utility Menu 1 Push the UTILITY front panel button to display the utility menu items 2 Push the System bottom screen button to display Apps 3 Push the Module bottom screen button to select Telecom The screen displays the telecom bottom and side menu items 4 Push bottom and side menu buttons to select a mask set test control parameters and test pass fail responses gt i Tek Run TUT G 703 DS 0 Single 64 kb s bobbed DS 0 Double 64 kb s i directional I 64 kb s h4 f 104mvi lamy 4 37 80 Current Mask Pass Fail Show system Module Mask Type Mask Apps Telecom ITU T El Coax Control Mask Test Results Conventions The following conventions apply to all TDS3TMT functions m You can perform multiple waveform mask testing by connecting signals to all oscilloscope input channels m While in Telecom Mask test mode the AUTOSET front panel button automatically sets the oscilloscope horizontal vertical and trigger parameters and positions the waveform in the selected mask m Mask testing only works with live channels It is recommended that you turn off math and reference waveforms while doing mask testing TDS3TMT Menu Table 1 Utility Menu Type Apps Module Telecom Bottom Mask Type ITU T Side None Off DS 0 Single 64 kb s DS 0 Double 64 kb s DS 0 Data Contra directional 64 kb s DS 0 Timin
6. User Manual TDS3TMT Telecom Mask Test Application Module 071 0648 02 INTO AAA T 071064802 Copyright O Tektronix All rights reserved Licensed software products are owned by Tektronix or its subsidiaries or suppliers and are protected by national copyright laws and international treaty provisions 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 TEK TEKPROBE and TekSecure are registered trademarks of Tektronix Inc DPX WaveAlert and e Scope are trademarks of Tektronix Inc Contacting Tektronix Tektronix Inc 14200 SW Karl Braun Drive P O Box 500 Beaverton OR 97077 USA For product information sales service and technical support In North America call 1 800 833 9200 Uj Worldwide visit www tektronix com to find contacts in your area Contents Safety Summary Installing the TDS3TMT Application Module Telecom Mask Test Features Accessing TDS3TMT QuickMenu Accessing TDS3TMT Utility Menu Conventions TDS3TMT Menu Telecom Pass Fail Mask Test Example Safety Summary To avoid potential hazards use this product only as specified While using this product you may need to access other parts of the system Read the General Safety Summary in other
7. cquiring sufficient serial trigger data When using the Lock Mask To Waveform feature be careful not to move the mask too far left or else you may lose your serial trigger Use Lock Mask To Waveform after acquisitions have stopped to examine a mask violation more closely To use Lock Mask to Waveform to make the mask fill more of the screen increase the acquisition record length by pushing ACQUIRE gt Horizontal Resolution gt Normal to set the record length to 10K points note that Normal mode only works with lock mode for horizontal settings of 100 ns div or faster You can also use Zoom to examine a mask and waveform provided that you pan and zoom in such a way that there is enough space to the left of the mask for the oscilloscope to detect the serial trigger 20 Autofit Key Points The following are some Autofit spe cific key points m The Autofit radius defines the size of a square search grid radius of 2 X radius 1 X 2 X radius 1 pixels centered on the waveform position Autofit moves the waveform using a spiral pattern testing for mask violations at each position For example the following table represents a spiral pattern for a radius value of 2 where the number represents the order of the waveform moves and the position of the number represents the position the waveform is offset relative to the starting point s A radius of two attempts to fit the waveform in 25 tries start position plus 24 9 10 11
8. e current test and the number of failed tests per the total number of tests run if Re peat on Completion is On If the number of waveforms that fail exceeds the violation threshold setting status text changes from Passing to Failing 12 Table 1 Utility Menu Type Apps Module Telecom cont Bottom Pass Fail Mask Test cont Side Description Repeat On When set to On repeats the Completion pass fail test cycle using the On Off current settings The status area Failures Test values show how many times the test has repeated and how many of those tests failed Number Of Sets the number of wave Waveforms forms to acquire for each pass fail test cycle Use the general purpose knob to set the value Any value above 100 000 sets the waveform count to infinity If waveform averaging is on the actual number of wave forms acquired is the Num ber Of Waveforms value times the waveform averag ing value 13 Table 1 Utility Menu Type Apps Module Telecom cont Bottom Pass Fail Mask Test cont Side Violation Threshold For Failure Description Sets how many failed wave forms define a failed test Use the general purpose knob to set the value Pre Test Delay Sets a time value that delays the start of a pass fail test Use the general purpose knob to set the value Polarity Sets the polarity of all active waveform channels Values are pos
9. g 64 kb s Old DS1 Rate 1 544 Mb s 6 703 DS1 1 544 Mb s E1 Symetric Pair 2 048 Mb s E1 Coaxial Pair 2 048 Mb s Clk Interface Symetric Pair 2 048 Mb s Clk Interface Coaxial Pair 2 048 Mb s DS2 Rate Symetric Pair 6 312 Mb s DS2 Rate Coaxial Pair 6 312 Mb s E2 8 448 Mb s 32 064 Mb s E3 34 368 Mb s Old DS3 Rate 44 736 Mb s G 703 DS3 44 736 Mb s Description ITU T standard masks Each mask sets the oscilloscope vertical horizontal and trigger controls to acquire that standard s waveform After selecting a standard push the AUTOSET front panel button to position the waveform in the mask The oscilloscope is set to edge trigger on waveforms per ITU T G 703 standard Table 1 Utility Menu Type Apps Module Telecom cont Bottom Side Description Mask None Off ANSI T1 102 standard Type DS1 1 544 Mb s masks Each mask sets the T1 102 DS1A 2 048 Mb s oscilloscope vertical hori DS1C 3 152 Mb s zontal and trigger controls to DS2 6 312 Mb s acquire that standard s DS3 44 736 Mb s waveform STS 1 Pulse 51 84 Mb s Mask None Off Turns off user mask Type User Mask Sets the oscilloscope to use Custom the User mask Copy Std Mask To Copies the selected ITU T or User Mask T1 102 mask into the User mask Use the general pur pose knob to select the standard mask to load Save Recall User Mask Saves or recalls User masks 10 Table
10. inverts all active channels and tests the second half of acquired waveforms Stop On Violation If Stop On Violation is On the pass fail status area displays Violation if there is a violation regardless of the pass fail test settings In other words Stop On Violation has a higher precedence than pass fail tests 18 Running Mask Test Indefinitely To run a mask test indefinitely while counting the number of violations set Number of Waveforms to infinity Triggering Selecting a mask standard automatically sets trigger parameters for that standard However to assign specific trigger parameters to a mask most likely for a new User mask push the Trigger MENU button selecting Comm and selecting the mask standard to use for triggering The oscilloscope assigns the selected standard s trigger parameters to the current mask Testing For Infrequent Errors To automatically capture and save waveform violations that occur infrequently over long periods of time set Pass Fail testing Repeat to On Number of Waveforms to 1 and Hardcopy Wfm On Failure to On You may also want to set UTILITY gt Hard Copy gt Options gt Compression to ON to compress the saved hardcopy data and thus store more files on the floppy disk Compression is not available for waveform isf format data 19 On Screen Mask Positions Many of the mask standards have their mask drawn on the right side of the graticule to allow enough room to the left for a
11. itive negative or both If set to Both the oscilloscope tests the first half of all active channel acquired waveforms in nor mal uninverted mode and then inverts all active chan nels and tests the second half of acquired waveforms Beep On Completion On Off When On causes the oscil loscope to emit a tone when the pass fail test is complete Beep On Failure On Off When On causes the oscil loscope to emit a tone when the pass fail test status changes from Passing to Failing 14 Table 1 Utility Menu Type Apps Module Telecom cont Bottom Side Description Pass Hard Copy On Failure When On causes the oscil Fail On Off loscope to send the screen Mask image to the hard copy Test device when the pass fail cont test status changes from Passing to Failing Save Failed Wfm To When On saves the failing Disk signal waveform s data to On Off the oscilloscope media drive when the mask test fails Show Count Hits When On displays the Results On Off number of mask hits fail ures per channel and per mask segment Enabling count hits slows down the mask test rate if mask test speed is important turn Count Hits Off 15 Table 1 Utility Menu Type Apps Module Telecom cont Bottom Side Show Violations Results Waveforms Description Displays pass fail test status information the number of waveforms that have violated the mask per number
12. ked Off unchecked Waveforms 500 Threshold 1 Polarity Positive Use the upper menu button to select a response and then use the lower menu button to enable or disable the selected response You can select and enable any com bination of responses 25
13. of waveforms tested in the current test and the number of failed tests per the total number of tests run if Re peat is On Segment 1 Hits Segment 8 Hits Status area that displays the number of hits for each channel on each mask seg ment Mask Testing and Pass Fail Testing Mask testing means the detection and highlighting of mask segment violations Pass Fail testing is setting conditions for mask testing such as the number of waveforms to test how many mask violations are allowed before failing a test whether to repeat testing upon completion what action to perform at the completion of a test and so on Turn Off Mask Testing To turn off mask testing and remove the mask from the screen set the mask standard to None 16 Standards and Pulse Amplitudes For those cases where a mask standard defines a valid pulse amplitude as being within a range of values the TDS3TMT mask is drawn for the maximum permitted amplitude For those cases where a mask standard does not define pulse amplitude the TDS3TMT mask is drawn for a nominal 1 V pulse Highlight Violations Highlight Violations must be on in order for the oscilloscope to perform mask comparisons If Highlight Violations is off the oscilloscope will not inform you of mask violations using highlighting or the Stop On Violation command and hits counting will not count Also turning on pass fail testing Count Hits or Stop on Violation automaticall
14. s an overview of these additional features Telecom Mask Test QuickMenu Use the telecom mask test QuickMenu function to display bottom and side menus that provide access to all key mask test functions from one screen Predefined Telecom Industry Masks The TDS3TMT application module provides compliance masks for testing to ITU G 703 and ANSI T1 102 telecommunications standards up to STS 1 52 Mb s line rates Multiple Channel Testing The TDS3TMT application module enables you to perform multiple simultaneous testing on all active oscilloscope channels Test Automation You can connect the oscilloscope to do automated mask testing by using the RS 232 GPIB or LAN commu nication ports Accessing TDS3TMT QuickMenu 1 Push the QuickMenu front panel button to display the quick menu items 2 Push the Menu bottom screen button to select and display the Telecom bottom and side menu items 3 Push bottom and side menu buttons to select a mask set test control parameters and test pass fail responses TekStop _ gt PASS FAIL Run Test Passed Waveforms Failed 0 Out of 2000 On Failure amp mopa p completion p 2 Repeat Waveforms 2000 Threshold 1 i Polarity lt M 10pns nw 037 40 MENU STANDARD CONTROL Telecom E1 Coax ITU T Highlight Average wfm Lock Autofit 2 048 Mb s Off On Off 16 Off On Accessing TDS3
15. y turns on Highlight Violations Pass Fail Testing Averaging When averaging is on the oscilloscope first generates an averaged waveform then the averaged waveform is compared to the mask This means that the total number of waveforms acquired is equal to the waveform averaging number times the number of waveforms being tested For example if pass fail Number of Waveforms is set to 500 and waveform averaging is set to 8 then the total number of waveforms acquired for one pass fail test cycle is 500 x 8 4 000 17 Saving Waveforms to Disk The default saved file name is TEKnnnnn fff where nnnnn is an incrementing number that usually starts at 00000 and fff is the file format Internal Spreadsheet or Mathcad file format as set in the SAVE RECALL gt Save Waveform to File menu For internal file format waveforms isf if more than one waveform is being tested look at the isf file preamble information at the top of the file to determine from which channel that waveform data came Refer to the TDS3000 TDS3000B and TDS3000C Series Programmer Manual for isf file format information Proper Signal Termination Make sure to correctly terminate communication test signals Tektronix offers optional AMT75 adapters for correct communication signal termination Pass Fail Testing Polarity When polarity is set to both the oscilloscope tests the first half of all active channel acquired waveforms with positive polarity and then
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