TDS3TRG Advanced Trigger Application Module User Manual
Contents
1. lt Tolerance e Trigger point 22 Runtis greater than width setti gt ng Runt Pulse Trigger Menu Table 4 Trigger Menu Type Pulse Class Runt Runtis not equal to width setting 5 tolerance i gt l Tolera nce Bottom Side Description Source Ch1 Ch4 Sets the runt signal source Ext Sets external or external divided Ext 10 by 10 as the signal source AC Line Same as description on Vert page 20 Polarity Positive Sets the source signal runt Negative pulse polarity on which to Either mgger TriggerWhen RuntOccurs Triggers the oscilloscope when any runt pulse is detected regardless of width Runt Width Triggers the oscilloscope when lt N the runt signal pulse width is less than or greater than the Runt Width IN i specified pulse width N Runt Width Triggers the oscilloscope when N the runt signal pulse width is F equal to or not equal to the RuntWidth specified pulse width N within a N 5 tolerance 23 Table 4 Trigger Menu Type Pulse Class Runt cont Bottom Side Thresholds High N Low N Description Sets the runt signal high thresh old and low threshold voltage levels to value N using the general purpose knob Setto TTL Sets runt signal threshold voltage levels to 2 0 V high hreshold and 0 8 V low hreshold Setto ECL Sets runt signal threshold voltage levels to 12. the oscilloscope recognizes 29 Table 6 TDS3TRG specifications cont Characteristic Pulse Triggering Minimum Rearm Time typical Delta Time Resolution using general purpose knob Description 5 ns For pulse and runt rearm time refers to the time between measured pulses For slew rate rearm time refers to the time it takes the signal to recross the two signal thresholds Time Range Resolution 39 6 ns to 9 99 us 13 2 ns 10 us to 99 9 us 92 4 ns 100 us to 999 us 1 us 1 ms to 9 99 ms 10 us 10 ms to 99 9 ms 100 us 100 ms to 999 ms 1ms 1sto10s 10 ms 30
3. 1 V high hreshold and 1 5 V low hreshold Mode amp Holdoff Same as Edge Trigger Trigger When The source runt pulse width must be 25 ns in order for the oscilloscope to detect the pulse 24 Slew Rate Triggering Slew Rate Trigger Conditions Signal slew rate is greater faster than specified slew rate Specified slew rate a lt gt Actual slew rate Signal slew rate is equal to specified slew rate 5 tolerance _ gt lt Tolerance Trigger poin Signal slew rate is less slower than specified slew rate Specified slew rate a lt _ Actual slew rate Signal slew rate is not equal to specified slew rate 5 tolerance Tolerance 25 Slew Rate Trigger Menu Table 5 Trigger Menu Type Pulse Class Slew Rate Bottom Side Description Source Chl Ch4 Sets the slew rate signal source Ext Sets external or external divided Ext 10 by 10 as the signal source AC Line Same as description on Vert page 20 Polarity Positive Sets the source signal slew rate Negative polarity on which to trigger Either Trigger When Slew Rate lt N Triggers the oscilloscope when the signal slew rate is less than Slew Rate gt N Or greater than the specified slew rate N Slew Rate Triggers the oscilloscope when N the signal slew rate is equal to or not equal to the specified Slew Rate slew rate
4. N within a 5 toler N ance Delta Time Shows the delta time compo N nent N of the slew rate as set using the general purpose knob 26 Table 5 Trigger Menu Type Pulse Class Slew Rate cont Bottom Thresholds Side High N Low N Description Sets the signal high threshold and low threshold voltage level components of the slew rate to value N using the general purpose knob Setto TTL Sets the signal threshold volt age levels to 2 0 V high threshold and 0 8 V low threshold Setto ECL Sets the signal threshold volt age levels to 1 1 V high threshold and 1 5 V low threshold Mode amp Holdoff Same as Edge Trigger Delta Time and Thresholds The delta time and threshold settings determine the calculated slew rate volts time Changing either value changes the calculated slew rate Trigger When The delta time component of the slew rate time from threshold to threshold must be 25 ns in order for the oscilloscope to detect the slew rate 27 Specifications This section describes the TDS3TRG Advanced Trigger application module specifications All specifications are guaranteed unless labeled typical Typical specifica tions are provided for your convenience but are not guaranteed To meet specifications two conditions must first be met m The oscilloscope must have been operating continuously for ten minutes within the operat
5. User Manual TDS3TRG Advanced Trigger Application Module 071 0306 01 IOAN ATA T OTU T 071030601 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 500 Beaverton OR 97077 TEKTRONIX TEK TEKPROBE and Tek Secure are registered trademarks of Tektronix Inc DPX WaveAlert and e Scope are trademarks of Tektronix Inc WARRANTY SUMMARY Tektronix warrants that the products that it manufactures and sells will be free from defects in materials and workmanship for a period of one 1 year 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 Contacting Tektr
6. ater than or less than time period N Is True N Triggers the oscilloscope when he input logic condition is true for a time period equal to or not Is True N equal to time period N within a 5 tolerance Thresholds Level Sets the threshold voltage level Input 1 N for input 1 and 2 to level N Level using the general purpose knob Input 2 N Setto TTL Sets the threshold voltage level to 1 4 V for both inputs Setto ECL Sets the threshold voltage level to 1 3 V for both inputs Set to 50 Sets the threshold voltage level to 50 of each input s peak to peak value Mode amp Same as Edge Trigger Holdoff Trigger When The input condition must be true or false for 22 ns in order for the oscilloscope to detect the pattern 16 State Triggering State Trigger Conditions Define inputs Thresholds Trigger when State Trigger Menu Trigger Table 2 Trigger Menu Type Logic Class State Bottom Side Define Inputs State Input Source Description Sets the state signal source Logic Sets the signal logic for state input source H high true L low true Clock Input Source Sets the clock signal source Slope Sets the signal slope rising or falling for clock input The clock slope defines when the clock signal is true 17 Table 2 Trigger Menu Type Logic Class State cont Bottom Side Descrip
7. d Trigger application module adds logic and pulse triggering capabilities to your TDS3000 series oscilloscope This section provides an overview of these new features Logic Trigger Features Logic triggering triggers the oscilloscope when two signals meet a Boolean logic condition The advanced trigger module provides pattern and state logic trigger modes Pattern Trigger Pattern triggering triggers the oscilloscope when two signals become logically true or false Basical ly the pattern triggering feature triggers the oscilloscope from the output of a two input AND OR NAND or NOR logic gate You can specify time constraints and signal threshold levels as part of the triggering condition This trigger is useful for digital logic troubleshooting State Trigger State triggering triggers the oscilloscope when a state signal is true or false at the time a clock signal transition is true This trigger is useful for trouble shooting digital logic synchronous state machines Pulse Trigger Features Pulse triggering triggers the oscilloscope when a signal meets a timing or threshold condition The advanced trigger module provides three pulse trigger modes pulse width runt pulse and slew rate Pulse Width Pulse width triggering triggers the oscillo scope when a signal pulse width is less than greater than equal to or not equal to a specified pulse width This trigger is useful for digital logic troubleshooting Runt Pulse Run
8. ic Overview Edge triggering can trigger on most signals and is the default trigger type Edge triggering sets the oscilloscope to trigger acquire signal data when a signal meets a specified signal slope and a single voltage threshold condition Single threshold voltage setting VA ALE Possible trigger points for positive slope signals However there are times when you need to trigger the oscilloscope on a more complex signal or when two signals meet a condition in order to troubleshoot a particular problem These problems include a pulse that is too narrow or wide and situations in which one signal is true when a second signal transitions from low to high Advanced triggering can help acquire signals with these types of problems Advanced triggering lets you further qualify the trigger conditions by adding parameters such as pulse width delta time logical comparisons of two signals and dual threshold levels Pulse width Runt pulse e Trigger point Thresholds Both pulse and logic triggering trigger the oscilloscope when one or two signals are logically true To determine whether a signal is true or false you must set a signal reference point that determines whether a signal is in one of two states You set this reference point by specifying a threshold voltage level for each trigger signal Crossing the threshold level toggles the state value of that signal Single threshold voltage setting High l
9. ing temperature range specified m You must perform the Compensate Signal Path operation described in the oscilloscope user manual If the operating temperature changes by more than 10 C you must perform the Compensate Signal Path operation again Table 6 TDS3TRG specifications Characteristic Logic and Pulse Description 1 0 division at BNC DC Coupled gt 10 mV div Trigger Sensitiv to lt 1 V div ity typical pattern state delay width and runt trigger ing Slew Rate Trig Same as Edge Trigger Sensitivity specifica ger Sensitivity tions in the oscilloscope user manual typical 28 Table 6 TDS3TRG specifications cont Characteristic Logic Triggering Minimum Logic Time typical Logic Triggering Minimum Rearm Time typical Pulse Triggering Minimum Pulse Width typical Description Pattern State 2 ns 2 ns Pattern minimum logic time the time thata logic pattern must be valid to be recognized State minimum logic time the time that a logic state must be valid before and after the clock edge to be recognized Pattern State 2 ns 4ns Pattern minimum rearm time the time that a logic pattern must be invalid before a new occurrence of the pattern is recognized State minimum rearm time the time between consecutive clocks 5 ns For pulse and runt minimum pulse width refers to the pulse being measured For slew rate minimum pulse width means the minimum delta time that
10. is false 11 m The NAND Not AND function means that if both signal logic states are true the condition is false otherwise the condition is true This function is the inverse of the AND function m The NOR Not OR function means if any or all of the trigger signal logic states are true the condition is false otherwise the condition is true This function is the inverse of the OR function Remember that the logic function evaluates the logic states of two signals and that the logic state of each signal depends on whether they are set to high true or low true logic For example assume that you want to trigger the oscillo scope only when signal one is low at the same time that signal two is high Therefore you want to m Set a threshold level that is appropriate for each signal m Set signal one to be true when it is low low true signal logic 12 m Set signal two to be true when the signal is high high true signal logic m Trigger when both conditions are true AND trigger logic Trigger logic Signal 1 AND Signal 2 Signal 1 logic low true Threshold settings Signal 2 logic high true Pattern is true trigger The material you have just read provides a basic under standing of the triggering concepts you need in order to use the Logic and Pattern triggering functions Refer to the Reference section for detailed information about the advanced trigger functions 13 Conventions The foll
11. ogic state Low logic Low logic state state Transition point from one state to another Logic State The actual state true or false of a signal depends on how you define its signal logic setting which can be either high true or low true Defining a signal as high true H means that signal levels above more positive than the threshold level are true and signal levels below more negative than the threshold level are false A low true L logic setting is just the opposite Defining a signal as low true means that signal levels below more negative than the threshold level are true and signal levels above more positive than the threshold level are false Low logic effectively inverts the signal Defining the logical state of a signal lets you use Bool ean logic to evaluate when a condition is true for two signals 10 High true logic Low true logic Boolean Logic The signal logic threshold level and high true low true logic defines which part of a waveform cycle is true or false You then use Boolean logic to evaluate or compare the logic of two signals as part of a trigger condition The four logical comparison functions are AND OR NAND and NOR m The AND function means that if both signal logic states are true the condition is true otherwise the condition is false m The OR function means if either or both signal logic states are true the condition is true otherwise the condition
12. onix Product For questions about using Tektronix measurement Support products call toll free in North America 1 800 833 9200 6 00 a m 5 00 p m Pacific time Orcontact us by e mail techsupport tektronix com For product support outside of North America contact your local Tektronix distributor or sales Office Service Tektronix offers a range of services including Support Extended Warranty Repair and Calibration services Contact your local Tektronix distributor or Sales office for details Fora listing of worldwide service centers visit our web site Toll free In North America Number 1 800 833 9200 An operator can direct your call Postal Tektronix Inc Address Department or name if known P O Box 500 Beaverton OR 97077 USA Web Site www tektronix com Contents Safety Summary 0 cece eee eee 2 Installing the Application Module 5 Advanced Trigger Features 000eeeee 5 Accessing Advanced Triggering 0005 7 Advanced Trigger Concepts 2000005 8 Conventions isis nire nin ni e eee eee 14 Pattern Triggering cece cece eee eee eee 15 State Triggering ccc cece eee eee eee 17 Pulse Width Triggering cece eeu e eens 19 Runt Pulse Triggering cc eee eee eee ees 22 Slew Rate Triggering cece eee eee eee 25 Specifications 0c cece eee a eee 28 Safety Summary To avoid potential hazards use this product onl
13. owing conventions apply to all advanced trigger functions m You cannot use any of the advanced trigger functions to arm B triggering m You do not have to display a channel in order to use the channel as a trigger source m The range of time values for pulse width regular and runt and slew rate is from 39 6 ns to 10 s m Inthe menu tables N represents a numeric value entered using the general purpose knob 14 Pattern Triggering Pattern Trigger Conditions Define Inpu ts Thresholds Define logic Trigg Goes Pattern Trigger Menu erwhen true false Table 1 Trigger Menu Type Logic Class Pattern Bottom Side Description Define Inputs Input 1 Sets the pattern trigger signal Source input 1 source Logic Sets the signal logic for input 1 H high true L low true Input 2 Sets the pattern trigger signal Source input 2 source Logic Sets the signal logic for input 2 H high true L low true Define Logic AND OR Sets which logic function to NAND NOR apply to the input signals 15 Table 1 Trigger Menu Type Logic Class Pattern cont Bottom Side Description Trigger When Goes True Triggers the oscilloscope when Goes False he logic condition is true or false Is True lt N Triggers the oscilloscope when he input logic condition is true Is True gt N for a time period gre
14. t pulse triggering triggers the oscillo scope when a signal pulse is less than a specified thresh old level You can also specify runt pulse width parame ters This trigger is useful for troubleshooting bus contention problems Slew Rate Slew rate triggering triggers the oscilloscope when a signal s slew rate rise or fall time is less than greater than equal to or not equal to a specified slew rate This trigger is useful for troubleshooting digital bus transceivers transmission lines and op amp circuits Accessing Advanced Triggering 1 Push the Trigger MENU button to display the Trigger screen buttons 2 Push the Type bottom screen button to display the trigger type pop up menu 3 Push the Type bottom screen button to select Logic or Pulse triggering 4 Push the Class screen button to select trigger class Te Furi u E Falie Zz news Tagan 1 Peters icgke i hika iik inanis TEP i i impt imera Che Lingle E hpi H L Loe Pubie ia Bal bere eal votre TO _ Tet ra TEREKE ihe Tie arn pana Lg wine iheeieoi aina Lispi Piera beim ann as Ti nabtiti Advanced Trigger Concepts This section introduces the concepts of signal logic and thresholds as they relate to advanced triggering These concepts apply to most or all of the advanced trigger functions You should read this section if you are not familiar with advanced triggering concepts or Boolean log
15. tion Trigger When Goes True Triggers the oscilloscope if the State signal is true when the clock signal slope is true Goes False Triggers the oscilloscope if the state signal is false when the clock signal slope is true Thresholds Level Sets the threshold voltage level State Input for state and clock signals to N level N using the general Level purpose knob Clock Input N Setto TTL Sets the threshold voltage level to 1 4 V for both inputs Set to ECL Sets the threshold voltage level to 1 3 V for both inputs Set to 50 Sets the threshold voltage level to 50 of each input s peak to peak value Mode amp Same as Edge Trigger Holdoff Trigger When The state signal must be true or false for 22 ns prior to the clock transition in order for the oscillo scope to detect the state 18 Pulse Width Triggering Pulse Trigger Conditions Triggers when pulse is Triggers when pulse is less than width setting greater than width setting k lt gt H testa level riggers when pulse is equal Triggers when pulse is not to width A sa to width ee 5 gt ae Tolerance e Trigger point 19 Table 3 Trigger Menu Type Pulse Class Width cont Bottom Side Description Level Level N Sets the signal threshold vo age level to Nusing the gen purpose knob t eral Setto TTL Sets the signal threshold vo age level to 1 4 V Se
16. tto ECL Sets the signal threshold vo age level to 1 3 V to 50 of the signal s peak peak value Set to 50 Sets the threshold voltage level 0 Mode amp Same as Edge Trigger Holdoff Trigger When The source pulse width must be 5 ns order for the oscilloscope to detect the pulse Pulse Width Trigger Menu Table 3 Trigger Menu Type Pulse Class Width Bottom Side Description Source Chl Ch4 Sets the pulse width signal source Ext Sets external or external divided Ext 10 by 10 as the signal source AC Line Sets the AC line frequency as the trigger source This trigger source is only available when the oscilloscope is connected to AC power Vert Sets the lowest numbered displayed channel as the trigger source Polarity Positive Sets the source signal pulse Negative polarity on which to trigger Trigger When Pulse Width Triggers the oscilloscope when lt N he source signal pulse width is ess than or greater than the an widi specified pulse width N Pulse Width Triggers the oscilloscope when N he signal pulse width is equal f 0 or not equal to the specified Pulse Width pulse width Nwithin a 5 N olerance 20 in 21 Runt Pulse Triggering Trigger Conditions Any runt positive negative or either AA Runtis less than width setting Runtis equal to width setting 5 tolerance mere gt _ gt
17. y 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 Installing the Application Module Please refer to the TDS3000 amp TDS3000B Series Application Module Installation Manual for information on installing your application module Advanced Trigger Features The TDS3TRG Advance
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