Tektronix DSA70000D Series - FFT Process; The FFT Display

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Math setups FFT process

FFT process

The FFT process m athematically converts the standard time-domain signal (repetitive or single-shot

acquisition) into its frequency components.

The FFT function process es the waveform record and displays the FFT frequency domain record, which

contains the input signal frequency components from DC (0 Hz) to ½ the sample frequency (also called

the Nyquist

frequency

(see page 173)).

The FFT display

The following illustration shows a typical time-domain w aveform and the frequency components of that

signal as part of the math FFT waveform.

252 DSA/DPO70000D, MSO/DPO/DSA70000C, DPO7000C, and MSO/DPO5000 Series

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Default Chapter5
- Table of Contents5
About Tektronix Oscilloscopes23
- Introduction23
- Product Description23
- Product Software27
Controls and Connectors77
- Front Panel Overview77
- Touch Screen80
- Wave Inspector Controls81
- Vertical Controls82
- Horizontal Controls83
- Trigger Controls83
- Run Controls86
- General Purpose Controls87
- Multiview Zoom Controls88
- Rear and Side Panel Connectors88
Cursor Setups93
- Cursor Setup Control Window (YT Display Format)93
- Track Mode94
- Cursor Type Control Window95
- Cursor Sources (YT Display)96
- Cursor Style97
- Cursor Position Control Window99
- Horizontal Bar Cursors100
- Vertical Bar Cursors101
- Waveform Cursors102
- Screen Cursors103
- Cursor Track Mode104
- Cursor Measurements104
- Cursor Setup Control Window (XY Display Format)107
Digital Setups109
- Digital Setup Control Window109
- Setting up Digital Signal Inputs110
- Digital Channel Threshold and Position111
  - Set Digital Channel Threshold111
  - Set Digital Channel Position112
- Turn on or off the Digital Channels D15-D8 and D7-D0113
- Set the Display Size of Logic Channels114
- Set the Global Threshold for Digital Channels115
- Set up Digital Channels116
Bus Setups117
- Bus Setup Control Window (Conﬁg Tab)117
- Bus Selection List118
- Bus Search Selection List120
- Display or Clear a Bus121
- Label a Bus121
- Change the Bus Position123
- Set up an I2C Serial Bus123
- Set up an SPI Serial Bus125
- Set up an RS-232 Serial Bus126
- Set up a USB Serial Bus128
- Set up a MIPI DSI-1 Serial Bus129
- Set up a MIPI CSI-2 Serial Bus131
- Set up an 8B10B Serial Bus133
- Set up a Custom Serial Bus134
- Set up a Pcie Serial Bus136
- Set up a CAN Serial Bus137
- Set up a LIN Serial Bus139
- Set up a FLEXRAY Serial Bus140
- Set up a MIL-1553 Serial Bus142
- Set up an Ethernet Serial Bus143
- Select the Serial Bus Channel Type145
- Select the Serial Bus Channel Input146
- Select the USB Serial Bus Speed147
- Select the USB Bus Signal Type148
- Select the Data Rate149
- Select the Serial Bus Input150
- Select the USB Bus Threshold151
- Select the Serial Bus Channel Threshold152
- Select the SPI Bus Channel Polarity153
- Select the RS-232 Bus Channel Polarity154
- Select the RS-232 Bus Data Bits155
- Select the RS-232 Bus Parity156
- Select the RS-232 Bus Bit Rate157
- Select the SPI Bus Framing158
- Set the SPI Bus Idle Time159
- Set the SPI Bus Word Size160
- Select the SPI Bus Bit Order161
- Set up a Parallel Bus162
- Set up a Clocked Parallel Bus163
- Add Sources to a Parallel Bus164
- Set up Bus Channel Thresholds165
- Change the Bit Order of a Channel in a Parallel Bus167
- Remove a Channel from a Parallel Bus168
- Select the Bus Clock Source Channel169
- Select the Bus Clock Channel Polarity170
- Bus Setup Control Window (Display Tab)170
- Select the Bus Display Components173
- Select the Bus Decode Method173
- View Bus Packet175
- Select the Bus Symbol Table175
- Symbol File Format176
- Opening a Bus Symbol Table File178
Magnivu Setup181
- Using Magnivu181
Display Setups185
- Display Control Window (Appearance Tab)185
- Display Control Window (Screen Text Tab)186
- Text Properties Control Window188
- Display Control Window (Objects Tab)189
- Display Control Window (Colors Tab)190
- Display Persistence191
- Select the Display Format192
- Set the Waveform Intensity194
- Select the Waveform Interpolation194
- Select the Graticule Style196
- Deﬁne the Color Palette197
- Remote Operation198
  - Remote Desktop Connection198
Horizontal and Acquisition Setups199
- Horizontal/Acquisition Control Window (Horizontal Tab)199
- Set Record Length Limit200
- Horizontal Digital Control Window201
- Horizontal Position/Scale Control Window202
- Horizontal Position/Scale Control Window: Delay Mode on203
- Horizontal/Acquisition Control Window (Acquisition Tab)203
- Autoset205
- Set Autoset Preferences207
- Undo an Autoset207
- Enable Fast Acquisitions208
- Start and Stop Waveform Acquisitions209
- Enable Roll Mode210
- Select a Sampling Mode211
- Set the Resolution215
- Select the Acquisition Mode215
- Fastframe Control Windows217
- Set up Zoom219
Errordetectorsetups221
- Use the Serial Error Detector221
- Set up the Serial Error Detector222
- Set Error Detector Advanced Settings225
- Specify the Error Detector Test Pattern226
- Set the Error Detector Stop Condition227
- Error Detector Overview227
Mask Testing Setups231
- Mask Testing Control Window (Masks Tab)231
- Select a Mask Type231
- Mask Types and Standards233
- Use Mask Display Controls235
Math Setups263
- Set up Math Averaging263
- Set Math Variables264
- Use Custom Analysis Functions265
- Custom Analysis Functions266
- MATLAB Custom Analysis Interface267
Measurement Setups289
- Measurement Snapshot Control Window289
- Measurement Setup Control Window (Amplitude Tab)290
- Measurement Readouts291
- Select an Amplitude Measurement292
- Measurement Setup Control Window (Time Tab)295
- Select a Time Measurement296
- Measurement Setup Control Window: (Communications Tab)299
- Select a Communications Measurement300
- Measurement Setup Control Window (more Tab)304
- Select a Miscellaneous Measurement305
- Set up Measurement Statistics307
- Set up Reference Levels308
- Set up Measurement Gating311
- Set up Histogram Measurements312
- Set up Histograms314
Analyzing Waveforms321
- Control Marks321
- Select a Search Type322
- Conﬁgure a Search326
- Copy Search Settings326
- Set Advanced DDR Search Settings327
- Check Search Results331
- View the Search Counts Results332
- View Search Marks332
- Set the Search Mode333
- Use Search and Mark Controls334
- Set up a Visual Search337
- Set up 8B10B Search Parameters339
- Set up RS-232 Search Parameters342
- Set up SPI Search Parameters345
- Set up I2C Search Parameters347
- Set up USB Search Parameters352
- Set up MIPI Search Parameters358
- Set up Pcie Search Parameters365
- Set up CAN Search Parameters367
- Set up LIN Search Parameters371
- Set up FLEXRAY Search Parameters375
- Set up MIL-1553 Search Parameters379
- Set up Ethernet Search Parameters382
- Set up DDR Search Parameters388
- Set up Custom Search Parameters390
- Set up Parallel Search Parameters391
- View the Protocol Decode Event Table392
- Copy the Event Table396
- Select Columns to Copy or Export397
- Save the Event Table398
Myscopesetups401
- Set up a Myscope Control Window401
- Use a Myscope Control Window402
- Save a Myscope File as a Dialog Box404
- Open or Edit a Myscope Dialog Box405
Trigger Setups407
- Set up Trigger Controls (a Event Tab)407
- Select the Trigger Type408
- Set the Trigger Mode Controls411
- Set up the Trigger Holdoff412
- Set to 50413
Vertical Setups503
- Set up Vertical Controls503
- Set up Input Channels503
- Zoom Control Window505
- Waveform Display Control Window507
- Set the Position/Offset507
- Waveform Label Control Window509
- Vertical Offset Control Window509
- Termination Controls511
- Coupling Controls514
- Deskew/Attenuation Control Window515
- Bandwidth Control Window516
- Enhanced Bandwidth516
- Vertical Setup Control Window: aux Tab519
- Probe Setup Control Window520
- Probe Setup Control Window: Setup Type522
- Probe Setup Control Window: D15-D0 Tab523
- Probe Setup Control Window: Probe Compensation524
- Probe Setup Control Window: Probe Tip Selection526
- Probe Setup Control Window: Probe Deskew527
- Probe Setup Control Window: Probe Attenuation528
- Probe Controls Window529
- Probe Properties530
- Probe Setup Control Window: Probe Status532
  - Copy Setup: Images535
  - Copy Setup: Waveforms536
  - Copy Setup: Measurements538
  - Copying the Screen for Use in Other Applications540
  - Copying Measurements for Use in Other Applications540
  - Page Setup Dialog Box541
  - Print Preview Dialog Box542
  - Print Dialog Box542
  - Printing the Screen to a Printer542
  - Reference Waveform Controls545
  - Recall Dialog Box: Waveform546
  - Recall Dialog Box: Instrument Setups547
  - Delete Setups and Reference Waveforms549
  - Set up Action on Event550
  - Set up Save on Event550
  - Print Setups552
  - Save as Dialog Box: Histogram552
  - Save as Dialog Box: Instrument Setup553
  - Save as Dialog Box: Measurement554
  - Save as Dialog Box: Screen Capture556
  - Save as Dialog Box: User Mask558
  - Save as Dialog Box: Waveform559
  - Save as Dialog Box: Digitals561
  - Save as Dialog Box: Timestamp562
Copyingandprinting535
Utilities565
- Tek Secure Erase565
- Set Time and Date565
- GPIB Conﬁguration Control Window566
- LAN Server Status Control Window568
- External Signals Control Window568
- Touch Screen571
- Instrument Calibration Control Window571
- Instrument Diagnostics Control Window572
- E-Mail on Event Control Window574
- Multipurpose Knobs577
- Install the Floating License586
- Install the Fixed License588
- Return the Floating License for the Installed Option(S)589
How to593
- Compensate the Signal Path593
- Compensate Active Probes593
- Compensate Passive Probes594
- Low Frequency Compensate a Probe595
- Deskew596
- Setting up Analog Channels596
- Setting Acquisition Modes597
- Use Fast Acquisitions598
- View the Analog Characteristics of a Digital Signal601
- Set up Digital Channels601
- Set up a Bus602
- Set up a Parallel Bus602
- Set up an SPI Serial Bus604
- Set up an I2C Serial Bus604
- Set up an RS-232 Serial Bus605
- Set up a USB Serial Bus606
- Set up a MIPI DSI-1 Serial Bus606
- Set up a MIPI CSI-2 Serial Bus607
- Set up an 8B10B Serial Bus607
- Set up a Custom Serial Bus608
- Set up a Pcie Serial Bus608
- Set up a CAN Serial Bus609
- Set up a LIN Serial Bus609
- Set up a FLEXRAY Serial Bus610
- Set up a MIL-1553 Serial Bus610
- Set up an Ethernet Serial Bus611
- Conﬁguring the Bus Display612
- Tracking down I2C Serial Bus Anomalies612
- Troubleshooting Circuits Using a Parallel Bus614
- Troubleshooting an SPI Serial Bus617
- Creating Myscope Control Windows620
- Editing Myscope Control Windows620
- Select Cursor Sources622
- Taking Cursor Measurements623
- Taking Automatic Measurements624
- Take Automatic Measurements626
- Localize a Measurement627
- Save Measurements628
- Using Math Waveforms628
- Create a Math Waveform Using Predeﬁned Expressions632
- Create a Math Waveform with the Equation Editor633
- Create a Math Waveform634
- Set up Mask Testing635
- Create a New User Mask638
- Create a User Mask from a Deﬁned Mask640
- Edit a User Deﬁned Mask640
- Save a User Mask to Disk641
- Recall a User Mask from Disk642
- Create a User Mask with Mask Testing642
- Use Mask Testing643
- Send an E-Mail on Events643
- Create a Spectral Waveform644
- Deﬁne a Spectral Math Waveform645
- Use a Predeﬁned Spectral Math Waveform649
- Create a Reference Waveform650
- Save Reference Waveforms Using Auto-Increment File Name651
- Recall a Reference Waveform652
- Save a Waveform652
- Copy Waveform Data653
- Save a Screen Capture655
- Set the Horizontal Delay655
- Compare Data Using Horizontal Delay656
- Set up Roll Mode656
- Using Roll Mode657
- Checking Trigger Status657
- Set up Triggering from the Front Panel659
- Set up Triggering from the Trigger Setup Window661
- Trigger on a Sequence663
- Trigger on a Event Only664
- Trigger on an Event after a Speciﬁed Delay664
- Trigger on a B Event665
- Trigger on a Glitch666
- Trigger on a Runt Pulse666
- Trigger on a Pulse Width668
- Trigger on a Pulse Timeout669
- Trigger on a Pattern670
- Trigger on a Logic State672
- Trigger on the Transition Time673
- Trigger on Setup/Hold Time Violations674
- Trigger on Window Threshold Violations677
- Trigger on a Video Signal678
- Trigger on a Communication Signal679
- Trigger on a Bus680
- Mark All Trigger Events680
- Set up a Histogram683
- Take Automated Measurements on Histogram Data683
- Start or Reset Histogram Counting684
- Display a Waveform684
- Set up XY Display Format685
- Use Multiview Zoom with Waveforms686
- Choose a Color Palette687
- Customize the Display Palette688
- Save the Instrument Setups690
- Recall an Instrument Setup690
- Delete Instrument Setups691
- GPIB Programmer Online Help692
- Oscilloscope Applications Software692
- Add a Software Application to the Instrument692
  - Set up a Dual Display692
  - Enable a Network Connection694
  - Exit the Instrument Application694
  - Minimize the Instrument Application694
  - Shut down the Instrument695
  - Adjust the Display Contrast695
Oscilloscope Reference697
- Functional Model697
- Process Overview698
  - Signal Connection699
  - Probes and Signal Connection699
  - Input Conditioning700
  - Bandwidth Enhancement701
  - Coupling702
  - Scaling and Positioning703
  - Vertical Acquisition Window Considerations703
  - Horizontal Acquisition Window Considerations706
  - Horizontal Acquisition Window Interrelated Parameters706
  - Independent Versus Shared Window707
  - Incompatible Acquisition Features708
  - Autoset Considerations709
  - Acquisition Hardware709
  - Sampling Process711
  - Sampling Modes712
  - Waveform Record712
  - Interleaving714
  - Interpolation714
  - Triggering Concepts714
  - Trigger Sources716
  - Trigger Types717
  - Trigger Modes720
  - Trigger Holdoff721
  - Trigger Coupling722
  - Trigger Slope and Level722
  - Horizontal Trigger Position723
  - Delayed Trigger System724
- Advanced Triggering724
- Bus Trigger725
- Communication Trigger725
- Communication Triggering726
- Glitch Trigger727
- Pattern Trigger727
- Runt Trigger728
- Setup and Hold Trigger728
- State Trigger730
- Timeout Trigger731
- Transition Time Trigger731
- Video Trigger731
- Width Trigger732
- Window Trigger732
- Sequential Triggering733
- Triggering with Horizontal Delay off733
- Triggering with Horizontal Delay on734
- Triggering and Horizontal Delay Summary736
- Display Overview736
- Display Elements737
- Customizable Display Elements739
- Acquisition Preview742
- Waveform Display742
- Operations on the Time Base744
- Horizontal Position and the Horizontal Reference Point745
- Using the Multizoom Feature746
- Automatic Measurements746
- Measurement Variables748
- Measurement Algorithms751
- Measurements on Envelope Waveforms760
- Missing or Out-Of-Range Samples761
- Measurement Warnings762
- Measurement Errors763
- Cursor Types764
- Histograms765
- Typical Math Waveforms765
- Math Waveforms766
- Math Waveform Differentiation768
- Math Waveform Sources770
- Math Waveform Expression Syntax771
  - Offset, Position, Scale, and Math Waveforms772
  - Waveform Integration772
  - Mask Testing803
File Menu843
- Acquisition Mode858
- Installing Software866
- Negative Duty Cycle895
- Normal Trigger Mode896
- Positive Duty Cycle918
- Probe Compensation921
- Rise Time926
- Trigger Source951

Tektronix DSA70000D Series - FFT Process; The FFT Display

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