TDS3LIM Limit Test Application Module User Manual
Contents
1. 0 cece en eens 17 Mehus iii u a a a na an 19 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 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 TDS3LIM Application Module Refer to the TDS3000 TDS3000B and TDS3000C Se2. selecting the V Limit and the H Limit menu fields Use the general purpose knob to select the value for each field The minimum increment value is 20 mdiv or one pixel Refer to page 6 for an explanation of the template envelope 21 Apps Module Limit Test Menu The TDS3LIM module adds a limit test menu item to the UTILITY gt System gt Apps gt Module menu The following table describes the new limit test bottom and side menu functions UTILITY gt System gt Apps gt Module Menu Bottom side Description Limit Test Limit Test Turns limit testing on or off Setup On Off Stop On When On the oscilloscope stops Violation waveform acquisition when there is On Off a limit test failure on any channel The input waveforms and violations remain displayed on the screen Beep On When On the oscilloscope beeps Violation when there is a limit test failure on On Off any channel Hard Copy On When On the oscilloscope sends Violation an image of the screen to the hard On Off copy device or file for each occur rence of a limit test violation 22 UTILITY gt System gt Apps gt Module Menu cont Bottom Limit Test Setup cont Limit Test Sources Description Wfms To Disk When On the oscilloscope saves On Violation the violating waveform s data to a On Off file on the drive for each occurrence of a limit test violation Compare Selects which input channel to Ch1 Ch4 compare to
3. steps the Limit Test Quick Menu must still be displayed 1 Connect the test waveform to any one of the oscilloscope inputs 2 Setthe source waveform horizontal and vertical settings to the same values that were used to create the template 3 Push the Waveform Comparisons bottom button for the test waveform channel to select the limit test template Ref1 Ref4 14 Selecting Limit Test Responses When the active waveform exceeds the template wave form s envelope the oscilloscope can do one or more of the following actions m Send a hard copy of the screen to a printer or file m Save the failing test waveform to a file on the drive m Emit a beep each time the test waveform fails Stop waveform acquisition and display the failing waveform s In the QuickMenu the On Violation side menu uses two buttons as shown in the following figure On Violation Select a response gt Ea Stop Enable disable a response 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 15 Starting Limit Testing After setting up a template waveform selecting a test waveform channel or channels and selecting the oscillo scope limit test responses you are ready to start limit testing To start limit testing push the CONTROL bottom menu butto
4. which limit test tem To plate stored in reference memory Ref1 Ref4 locations Refi through Ref4 None Selecting none disables limit testing on that channel Repeatedly push the side menu button to cycle through the possible selections You can compare each channel to a separate template waveform or compare multiple inputs to the same template 23 UTILITY gt System gt Apps gt Module Menu cont Bottom Create Limit Test template 24 Template Source Template Destination V limit H Limit Description Selects which signal source to use to create the limit test template Valid sources are channels 1 through 4 and reference waveform memory Ref1 through Ref4 Selects which reference memory location to use to store the limit test template Valid sources are Refl through Ref4 Sets the vertical or horizontal limits used to create a template wave form envelope Use the general purpose knob to select the limit value Units are in divisions and range from zero to five major divisions in pixel Refer to page 6 for an explanation of the template enve lope UTILITY gt System gt Apps gt Module Menu cont Bottom Create OK Store Limit Test Template template cont Description Stores the template waveform defined by the source and V H limit settings to the specified reference memory destination The limit test template is not stored until you push this menu button
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6. Test Setup Sources 10 Creating a Limit Test Template You must create a limit test waveform template before you can do limit testing The TDS3LIM lets you easily create a template by using aknown good waveform active or reference using the vertical and horizontal division units to graphically define the template wave form envelope and saving the template to reference waveform memory Refl Ref4 To use an active waveform to create a limit test template do the following steps 1 Connect a known good waveform to any one of the oscilloscope inputs 2 Setthe oscilloscope horizontal and vertical controls to optimize the waveform size and position on the screen NOTE Use the Average acquisition mode to create a smoother cleaner template waveform You can also save the oscilloscope settings from step 2 into setup memory so that later on you can quickly reload the oscilloscope settings to correctly display the incoming waveform for limit testing NOTE Use Envelope acquisition mode in order to create template waveforms that include occasional overshoots 11 3 Push the QUICKMENU panel button 4 Push the Menu bottom button to select Limit Test 12 The oscilloscope displays the limit test bottom and side menu items Push the Template Source Destination side button to select the Source field use the general purpose knob to select the channel to which the known good signal is connected Ch1 Ch4 You can al
7. User Manual TDS3LIM Limit Test Application Module 071 0934 01 ITO A AA INN 071093401 Copyright 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 Worldwide visit www tektronix com to find contacts in your area Contents Safety Summary 0 0e cece e eee nn nenn 2 Installing the Application Module 5 Limit Testing Concepts 0eeeeeeeeeee 5 TDS3LIM Overview 0 cece eee e een eee 8 Accessing Limit Test Menus 02 0000 9 Creating a Limit Test Template 005 11 Selecting a Limit Test Input 0eee eee 14 Selecting Limit Test Responses 055 15 Starting Limit Testing 00e eee ee eneee 16 TDS3LIM Conventions
8. hannel You can compare each channel to a separate template waveform or compare multiple channels to the same template 19 Limit Test QuickMenu side menu Menu item SETUP On Violation 20 Description Printer icon When enabled sets how the Drive icon oscilloscope responds to limit test Speaker icon failure Stop The four response actions to a limit test failure are send a screen capture to the hard copy device save the failing waveform data to a file on the drive emit a beep for each failure and stop waveform acquisition This menu uses two side menu buttons The upper button selects a response in the side menu and the lower button enables or dis ables the current selection see page 15 You can select and enable any combination of re sponses Limit Test QuickMenu side menu cont Menu item TEMPLATE Source Destination TEMPLATE V Limit H Limit Ch1 Ch4 Ref1 Ref4 Ref1 Ref4 0 to 5 div Description Sets the waveform source from which to create a limit test tem plate waveform and the destina tion reference memory location in which to store the template wave form Pushing the side menu button toggles between selecting the Source and Destination menu fields Use the general purpose knob to select the value for each field Sets the vertical and horizontal division units used to create a template waveform envelope Pushing the side menu button toggles between
9. lay intensity while Limit Testing is on 17 18 If you are using two or more waveform templates at a time in a limit test all the waveform templates must use the same horizontal time base setting Source waveforms you are testing must be set to the same horizontal and vertical settings used to create the corresponding template waveform s When limit test is set to Hard Copy On Violation or Save To Disk the oscilloscope completes the task before processing any other tasks or continuing signal acquisition Save To Disk saves the waveform data using the format specified in the SAVE RECALL gt Save Waveform gt To File menu Please check this setting so that you are saving waveform data in your preferred format Turning limit testing on sets the signal acquisition mode to Sample Menus The following sections list the limit test menus and describe each menu function Limit Test QuickMenu The Limit Test QuickMenu displays bottom and side menus that provide fast access to all limit test functions on one screen Limit Test QuickMenu bottom menu Menu item CONTROL WAVEFORM COMPARISONS Chi Ch2 Ch3 Ch4 Ch3 Ch4 on 4 channel models only Value OFF ON Ref1 Ref4 None Description When on starts limit testing Assigns a reference memory location to a signal input chan nel Repeatedly push the menu button to cycle through the selections Selecting None disables limit testing on that c
10. n to select On The oscilloscope starts limit testing and continues testing until a violation occurs at which time the oscilloscope performs the selected response action NOTE If Stop On Violation is not selected the oscilloscope performs all selected response tasks such as emit a beep and then resumes limit testing NOTE If the oscilloscope displays an error message Stating that limit testing is turned off check that you have enabled the input signal channels and that there is a valid limit test waveform template or templates in the selected reference memory location s 16 TDS3LIM Conventions The following conventions apply to the TDS3LIM Limit Test application module You do not need to display a reference template waveform to do limit testing Moving a reference template waveform on the display screen does not change the reference template waveform data or the limit test parameters Limit testing compares active signals to the waveform template data in reference memory When limit test is set to Stop On Violation the oscilloscope stops signal acquisition and highlights the waveform violations While in Limit Test mode the WAVEFORM INTENSITY knob controls the limit test violations display decay time The decay time is the amount of time that the violation highlighting remains on the screen The range of values is zero seconds to always on infinity The Waveform Intensity knob does not affect active signal disp
11. ource waveform is compared with an envelope waveform each source waveform sample point value is compared to the vertical and horizontal min max values of the corresponding envelope waveform sample point Any source waveform data point that is not equal to or within the corresponding template envelope min max values is a violation TDS3LIM Overview This section provides an overview of the TDS3LIM Limit Test application module features and describes how to access the limit test functions You can do the following limit test tasks with the TDS3LIM application module Create and save up to four template waveforms in reference memory You can create a template waveform from either an active input signal or from a saved reference waveform Select the channel to compare to the template You can compare multiple channels to a single template waveform compare each channel to a single template waveform or any combination of the above Set the oscilloscope to respond to waveforms that exceed the template limits You can set the oscilloscope to stop acquiring waveforms save the failed waveform data to a file emit a beep save the screen image to the hard copy device or any combination of the above Accessing Limit Test Menus You access the TDS3LIM limit test controls from either the limit test QuickMenu or from the Applications menu The QuickMenu displays a single bottom and side menu that provides quick access to all limit test func
12. ries Application Module Installation manual for instructions on installing and testing the application module Limit Testing Concepts Limit testing is the ability to compare an active signal with a template waveform The following figure shows an active waveform dark sine wave being compared to a template waveform shaded area Any part of the active waveform that exceeds the tem plate waveform s envelope is a limit test waveform violation which the oscilloscope highlights You can set the oscilloscope to respond to a limit test violation by stopping limit testing emitting a beep and so on The following figure shows the highlighted black part of the active waveform that exceeds the limit test envelope A template is an envelope waveform that consists of minimum maximum min max pairs of sample points Template envelope waveforms created from 500 point source waveforms contain 250 min max pairs Template envelope waveforms created from10K point waveforms contain 5000 min max pairs The following figure represents how the oscilloscope creates the template waveform limit test envelope from user entered vertical and horizontal division units Division units are referenced to graticule divisions where 1 major division contains 1000 millidivisions or mdivs The minimum mdiv unit is 20 which equals one screen pixel Vertical gt Horizontal Resulting limits limits template When a s
13. so create a limit test waveform template from a reference waveform by using the general purpose knob to select a reference waveform Refl Ref4 Push the Source Destination side button to select the Destination field use the general purpose knob to select the reference memory location where you want to store the template waveform Refl Ref4 Push the V Limit side button to select the template vertical limits field Use the general purpose knob to set the template waveform envelope vertical limits Refer to page 6 for an explanation of the limit units 8 Push the H Limit side button to select the horizontal limits field Use the general purpose knob to set the template waveform envelope horizontal limits Refer to page 6 for an explanation of the limit units 9 Push the Store Template bottom button to create the limit test waveform and save it to the specified reference memory location If the template reference waveform is currently displayed the oscilloscope redraws the reference waveform using the newly stored values 10 If the template reference waveform is not currently displayed push the CONTROL bottom button to select On The oscilloscope displays the reference waveform 11 Ifthe template reference waveform does not meet your requirements repeat steps 7 through 9 to change the template waveform envelope 13 Selecting a Limit Test Input To select the channel source for comparing with a template do the following
14. tions To display the limit test QuickMenu do the following steps 1 Push the QUICKMENU panel button 2 Push the Menu bottom button to select Limit Test The oscilloscope displays the limit test bottom and side menu items Tekstop eb meer wur SETUP On Violation Stel Od _ stop TEMPLATE 0 Source chi Destination V Limit j 150mdiv H Limit 100mdiv M 20045 A Chi 5 3 20V Store Template 20045 7 0 00000 s MENU CONTROL WAVEFORM COMPARISONS Limit off chi ch2 ch3 cha Test on Refl None None None The Applications menus provide multiple bottom and side menu items that contain all limit test controls and settings The menu items contain text or graphics that more fully describe the function of each menu item To display the limit test menu items in the Applications menu do the following steps 1 Push the UTILITY panel button 2 Push the System bottom button to select Apps 3 Push the Module button to select Limit Test The bottom and side menus change to show the limit test functions gt Tek Stop Limit Test Setup Limit Test fon ort stop Violation on off Beep On Viohtlon on or Hard Copy on Violation onl 1 L Wims To Disk M 20045 A Chi 3 20 vi On Violation on on Sire 20015 thy 0 09000 S Create Limit Test Limit Test imit
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