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Tektronix TDS 684A, TDS 744A, TDS 784A Trigger Based on Pulse Width

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Triggering on Waveforms

3–76 TDS 684A, TDS 744A, & TDS 784A User Manual

Hint: To use the Trigger Bar feature to set the threshold levels on the pulse

train, press DISPLAY ➞ Readout Options (main) ➞ Trigger Bar Style

(side) until Long appears in that menu item.

Note the position of the trigger indicator in Figure 3–45 on page 3–75. Trigger-

ing occurs at the point the pulse returns over the first (lower) threshold going

negative without crossing the second threshold level (upper). The polarity

selected in the Polarity side menu determines the order that the threshold must be

crossed for a runt trigger to occur:

Positive requires that the lower threshold must be first crossed going positive,

then recrossed going negative without the upper threshold being crossed at all.

Negative requires that the upper threshold must be first crossed going negative,

then recrossed going positive without the lower threshold being crossed at all.

Either requires only that either one of the thresholds must be first crossed going

in either direction, then recrossed going in the opposite direction without the

other threshold being crossed at all.

For all three polarity settings, triggering occurs at the point the runt pulse

recrosses its first threshold.

Set the Mode and Holdoff. Mode and holdoff can be set for all standard trigger

types and classes. To set mode and holdoff, refer to Set Mode & Holdoff on

page 3–59. To learn more about trigger mode and holdoff, see Trigger Modes

and Trigger Holdoff on page 3–51.

When you select the pulse class Width, the oscilloscope will trigger on a pulse

narrower (or wider) than some specified range of time (defined by the upper

limit and lower limit). To set up for width triggering, do the following proce-

dures.

Select Width Triggering. Press TRIGGER MENU ➞ Type (main) ➞ Pulse

(pop-up) ➞ Class (main) ➞ Width (pop-up).

Select the Source. Press TRIGGER MENU ➞ Type (main) ➞ Pulse

(pop-up) ➞ Source (main) ➞ Ch1, Ch2, Ch3, or Ch4 (side). The source

selected becomes the trigger source for all four trigger classes.

Select the Polarity. Press TRIGGER MENU ➞ Type (main) ➞ Pulse

(pop-up) ➞ Class (main) ➞ Width (pop-up) ➞ Polarity (main) ➞ Positive or

Negative (side).

Trigger Based on Pulse Width

Contents

Main Page WARRANTY Certificate of the Manufacturer/Importer German Postal Information Bescheinigung des Herstellers/Importeurs EC Declaration of Conformity Page Table of Contents Getting Started Operating Basics Reference Appendices Glossary Index List of Figures Page Page Page List of Tables Page General Safety Summary Injury Precautions Product Damage Precautions Safety Terms and Symbols Certifications and Compliances Page Preface Related Manuals Conventions Default Model Page TDS 684A, TDS 744A, & TDS 784A User Manual 11 Product Description Product Specification Start Up Preparation Input Coupling Signal Path Compensation Recommended Probes Probe Usage Putting into Service Installation Front Cover Removal Power On Self Test Power Off Page Overview Page Operating Interface Maps Front Panel Map Left Side 24 TDS 684A, TDS 744A, & TDS 784A User Manual Front Panel Map Right Side TDS 684A, TDS 744A, & TDS 784A User Manual 25 Rear Panel Map 26 TDS 684A, TDS 744A, & TDS 784A User Manual Display Map To Operate a Menu To Operate a Pop-Up Menu Tutorial Setting Up for the Examples Connect the Input Signal Reset the Oscilloscope Examine the Display Elements Page Example 1: Displaying a Waveform Adjust the Waveform Display Autoset the Oscilloscope Example 2: Displaying Multiple Waveforms Add a Waveform Page Assign Controls to Another Channel Remove a Waveform Example 3: Taking Automated Measurements Display Measurements Automatically Remove Measurement Readouts Change the Measurement Reference Levels Page Displaying a Snapshot of Automated Measurements Example 4: Saving Setups Save a Setup Recall a Setup Page Page Overview Acquiring and Displaying Waveforms Page Acquiring and Displaying Waveforms Coupling Waveforms to the Oscilloscope To Compensate Passive Probes Page Setting up Automatically: Autoset and Reset Input Impedance Considerations To Autoset the Oscilloscope List of Autoset Defaults Selecting Channels To Reset the Oscilloscope To Identify the Selected Channel To Select and Remove Waveforms Scaling and Positioning Waveforms Waveform Priority To Check Position To Check the Vertical Scale To Change Vertical Scale and Position Page To Change Vertical Parameters To Check the Horizontal Status To Change Horizontal Scale and Position To Change Horizontal Parameters Page Choosing an Acquisition Mode To Select the Delayed Time Base Sampling and Digitizing Real-time Sampling Equivalent-Time Sampling Interpolation Interleaving The Acquisition Modes Acquiring and Displaying Waveforms Multiple Waveform Acquisitions Figure 313: How the Acquisition Modes Work TDS 684A, TDS 744A, & TDS 784A User Manual 321 Single Waveform Acquisition Page Page Selecting Repetitive Sampling Stop After Preventing Aliasing Customizing the Display Change Display Settings Select the Display Style Adjust Intensity Set Display Readout Options Page Select Interpolation Filter Select the Graticule Type Select the Format Page Customizing the Display Color Change the Display Color Choose a Palette Change the Palette Colors Set Math Waveform Color Set Reference Waveform Color Select Options Restore Colors Zooming on Waveforms Using with Waveforms Interpolation and Zoom Checking the Zoom Factor Zoom a Waveform Page Set Interpolation Reset Zoom Using Dual Window Mode (TDS 700A Models Only) Dual Zoom a Waveform (TDS 700A Models Only) To Set Dual Zoom Offset Page Using InstaVu Acquisition Mode (TDS 700A Models Only) Waveform Capture Rate To Use InstaVu Mode Acquiring and Displaying Waveforms 344 TDS 684A, TDS 744A, & TDS 784A User Manual Normal DSO Mode Figure 326: Normal DSO Acquisition and Display Mode Versus InstaVu Mode InstaVu Mode Page Using FastFrameT (TDS 700A Models Only) Page Page Triggering on Waveforms Triggering Concepts The Trigger Event Trigger Sources Trigger Types Trigger Modes Trigger Holdoff Trigger Coupling Trigger Position Triggering from the Front Panel Slope and Level Delayed Trigger System To set MAIN LEVEL To Set to 50% To Force a Trigger To Single Trigger To Check Trigger Status Page Triggering on a Waveform Edge Trigger Menu To Check Edge Trigger Status To Select Edge Triggering To Select a Source To Specify Coupling To Set Mode & Holdoff Triggering Based on Logic To Set Slope To Set Level Pattern and State Classes Setup and Hold Class Triggering on Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 363 To Check Logic Trigger Status To Trigger on a Pattern Page To Define a Time Qualified Pattern Trigger To State Trigger To Trigger on Setup/ Hold Time Violations Page Triggering on Pulses Page To Trigger on a Glitch Page To Trigger on a Runt Pulse Page Trigger Based on Pulse Width To Trigger Based on Slew Rate Page Page Delayed Triggering Page Triggering on Waveforms 382 TDS 684A, TDS 744A, & TDS 784A User Manual Delayed Triggerable By Events Figure 349: How the Delayed Triggers Work Delayed Triggerable By Time To Run After Delay To Trigger After Delay Page Page Page Measuring Waveforms Taking Automated Measurements Measurement List Measuring Waveforms TDS 684A, TDS 744A, & TDS 784A User Manual 389 Table 39: Measurement Definitions (Cont.) Measurement Readouts Display Measurements Remove Measurements Gate Measurements Define High-Low Setup Define Reference Levels Take a Delay Measurement Take a Snapshot of Page Taking Cursor Measurements Cursor Types Cursor Modes Cursor Readouts Select the Cursor Function Set Mode and Adjust the Cursors Taking Graticule Measurements Select Cursor Speed Select Time Units Select Amplitude Units Optimizing Measurement Accuracy: SPC and Probe Cal Measure Waveform Amplitude Measure Waveform Time Signal Path Compensation Page Probe Cal Page Page Page Page Page Page Saving Waveforms and Setups Saving and Recalling Setups To Save a Setup To Recall a Setup Page Saving and Recalling Waveforms To Save a Waveform Page To Recall a Waveform From Disk To Enable Autosave Managing the File System To Run the File Utilities To Access the File Utilities To Delete To Rename To Copy To Print To Create a Directory Printing a Hardcopy To Set Confirm Delete To Set Overwrite Lock To Format Supported Formats To Set Up for Making Hardcopies Page Page To Print Directly to a Hardcopy Device To Save to a Floppy Disk To Print Using a Controller Communicating with Remote Instruments To Prepare for Remote Operation To Set Up for Remote Operation Page Page Determining Status and Accessing Help Displaying Status Displaying the Banner Page Displaying Help Page Using Features for Advanced Applications Limit Testing To Create Limit Test Template Page To Select a Limit Test Source To Specify the Limit Test Response Single Waveform Comparisons Multiple Waveform Comparisons Waveform Math To Use Single Wfm Math To Use Dual Wfm Math Fast Fourier Transforms To Average a Math S To Create an FFT Page Page To Take Cursor Measurements of an FFT To Take Automated Measurements of an FFT The FFT Frequency Domain Record Page Page Record Length Acquisition Mode Zoom and Interpolation Undersampling (Aliasing) Considerations for Phase Displays Page FFT Windows Page Page Waveform Differentiation To Create a Derivative of a Page Page Waveform Integration Using Zoom To Create a Integral Math To Take Cursor Page To Take Automated DC Offset Using Zoom Page Page Appendix A: Options and Accessories Options Appendix A: Options and Accessories A2 TDS 684A, TDS 744A, & TDS 784A User Manual Table A1: Options (Cont.) Standard Accessories Optional Accessories Accessory Probes Accessory Software Warranty Information Service Assurance Page Appendix B: Algorithms Measurement Variables High, Low HighRef, MidRef, LowRef, Mid2Ref Other Variables MCross Calculations Page Measurement Algorithms Amplitude Area Burst Width Cycle Area Cycle Mean Frequency High Low Maximum Mean Minimum Negative Duty Cycle Negative Overshoot Negative Width Peak to Peak Period Phase Positive Duty Cycle Positive Overshoot Positive Width Rise Time RMS: Measurements on Envelope Waveforms Integration Algorithm Page Missing or Out-of-Range Samples Appendix C: Packaging for Shipment Page TDS 684A, TDS 744A, & TDS 784A User Manual D1 Appendix D: Factory Initialization Settings D2 TDS 684A, TDS 744A, & TDS 784A User Manual TDS 684A, TDS 744A, & TDS 784A User Manual D3 D4 TDS 684A, TDS 744A, & TDS 784A User Manual TDS 684A, TDS 744A, & TDS 784A User Manual D5 Page Appendix E: Probe Selection Passive Voltage Probes General Purpose (High Input Resistance) Probes Low Impedance (ZO) Probes High Voltage Probes Active Voltage Probes High Speed Active Probes Differential Probes Fixtured Active Probes Current Probes Optical Probes Time-to-Voltage Converter Page Page Glossary Page Page Page Page Page Page Page Page Page Page Page Page TDS 684A, TDS 744A, & TDS 784A User Manual Index1 Index Numbers A Index2 TDS 684A, TDS 744A, & TDS 784A User Manual B C TDS 684A, TDS 744A, & TDS 784A User Manual Index3 D Index4 TDS 684A, TDS 744A, & TDS 784A User Manual TDS 684A, TDS 744A, & TDS 784A User Manual Index5 E F G Index6 TDS 684A, TDS 744A, & TDS 784A User Manual H TDS 684A, TDS 744A, & TDS 784A User Manual Index7 I K L M Index8 TDS 684A, TDS 744A, & TDS 784A User Manual TDS 684A, TDS 744A, & TDS 784A User Manual Index9 N Index10 TDS 684A, TDS 744A, & TDS 784A User Manual O P TDS 684A, TDS 744A, & TDS 784A User Manual Index11 Q R Index12 TDS 684A, TDS 744A, & TDS 784A User Manual S TDS 684A, TDS 744A, & TDS 784A User Manual Index13 T Index14 TDS 684A, TDS 744A, & TDS 784A User Manual U V W TDS 684A, TDS 744A, & TDS 784A User Manual Index15 X Y Z