SIGLENT SDS2000X - FFT Operation

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SIGLENT

SDS2000X User Manual 125

FFT Operation

FFT is used to compute the fast Fourier transform using analog input channels or

reference waveforms. FFT takes the digitized time record of the specified source and

transforms it to the frequency domain. When the FFT function is selected, the FFT

spectrum is plotted on the oscilloscope display as magnitude in dBV versus frequency.

The readout for the horizontal axis changes from time to frequency (Hertz) and the vertical

readout changes from volts to dB.

FFT operation can facilitate the following works:

 Measure harmonic components and distortion in the device-under-test

 Measure the characteristics of the noise in DC power

 Analyze vibration

Main Page

Safety Information4
- General Safety Summary4
- Safety Terms and Symbols6
- Measurement Category7
- Working Environment8
- Ventilation Requirement9
- General Care and Cleaning10
Document Overview11
Table of Contents13
Quick Start23
- General Inspection24
- Appearance and Dimensions25
- To Prepare the Oscilloscope for Use26
- The Front Panel32
- The Rear Panel33
- Front Panel Function Overview34
- User Interface42
- To Use the Security Lock44
To Set the Vertical System45
- To Enable the Channel46
- To Adjust the Vertical Scale47
- To Adjust the Vertical Position47
- To Specify Channel Coupling48
- To Specify Bandwidth Limit48
- To Specify Probe Attenuation Factor49
- To Specify Channel Input Impedance49
- To Specify Amplitude Unit50
- To Invert a Waveform50
Set the Horizontal System51
- Adjust the Horizontal Scale52
- Adjust Trigger Delay53
- Set the Roll Mode54
- Use the Zoom Function55
To Set the Sample System56
- Run Control57
- Overview of Sampling58
- To Specify Memory Depth61
- To Select Sampling Mode61
- To Select Waveform Interpolation Method62
- Figure 12: X Interpolation63
- To Select Acquisition Mode64
- To Change the Horizontal Format68
- Use Sequence Mode69
To Trigger the Oscilloscope71
- Trigger Source73
- Trigger Mode74
- Trigger Level75
- Trigger Coupling76
- Trigger Holdoff77
- Noise Rejection78
- Trigger Type80
Serial Trigger and Decode100
- IIC Trigger and Serial Decode101
- SPI Triggering and Serial Decode109
- UART/RS232 Trigger and Serial Decode116
- CAN Trigger and Serial Decode122
- LIN Triggering and Serial Decode128
Digital Channels133
- To Connect the Digital Probes to the Device-Under-Test134
- Acquiring Waveform Using the Digital Channels135
- To Change the Display Type of the Digital Channels135
- Figure 60: Middle Display Type136
- To Switch a Single Channel on or off137
- To Switch All Digital Channels on or off137
- To Change the Logic Threshold for Digital Channels137
- To Reposition a Digital Channel138
- To Display Digital Channels as a Bus138
- Figure 64: Digital Bus139
To Save Reference Waveform140
- To Save REF Waveform to Internal Memory141
- To Display REF Waveform141
- To Adjust REF Waveform Display142
- To Clear REF Waveform Display142
To Use the Math Operation143
- Units for Math Waveforms144
- Math Operators145
- To Adjust the Math Waveform Scale and Offset154
  - To Adjust the Math Waveform Horizontal Scale and Offset154
  - To Adjust the Math Waveform Vertical Scale and Offset154
To Make Cursor Measurements155
- Cursors155
- Y Cursors155
- To Make Cursor Measurements156
To Make Measurements157
- Type of Measurement158
- To Make Automatic Measurements162
- Figure 79: Add the Measurement163
- To Clear Measurement Parameters164
- To Make All Measurement164
Display Setting165
- To Set Display Type166
- To Set Color Display167
- To Set and Clear Persistence167
- To Clear the Display168
- To Select Grid Type169
- To Adjust Waveform Intensity169
- Figure 85: Intensity Set to 100170
- To Adjust Grid Brightness171
- To Adjust Transparence171
Save and Recall172
- Save Type173
- Internal Save and Recall174
- External Save and Recall175
- Figure 88: Select Save Location176
- Disk Management178
System Function Setting181
- To View the System Status182
- To Do Self-Calibration183
- To Enable or Disable the Sound184
- To Specify the Language184
- To Enable Pass/Fail Test185
  - To Set and Perform Pass/Fail Test186
  - To Save and Recall Test Mask187
- I/O Set189
- To Do Power Analysis192
- To Enable Quick-Cal219
- To Update Firmware and Configuration220
- To Perform a Self-Test221
  - Keyboard Test222
  - LED Test223
- To Specify the Screen Saver Time224
- Option Management225
- Figure 141: Option Information226
To Use the History Function227
Arbitrary Waveform Generator229
- To Set Wave Type and Parameters230
- To Output Arbitrary Waveform232
- To Set Output Load233
- To Do AWG Self-Cal234
Default Setup235
Troubleshooting241

SIGLENT SDS2000X - FFT Operation

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