Fast Fourier Transforms
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TDS 420A, TDS 430A, TDS 460A & TDS 510A User Manual
Figure 3–19 compares the waveform record to the FFT time domain record.
Zero Phase
Reference
Waveform Record > 10 K
Waveform Record ≤ 10 K
Zero Phase
Reference
FFT Time Domain Record = 10k
FFT Time Domain Record =
Waveform Record
Figure 3–19: Waveform Record vs. FFT Time Domain Record
. The FFT time
domain record is input for the FFT. The resulting record is one half the length of
the FFT input (see Figure 3–20) because the FFT computes both positive and
negative frequencies. Since the negative values mirror the positive values, only
the positive values are displayed.
FFT Time Domain Record
FFT Frequency Domain Record
FFT
Figure 3–20: FFT Time Domain Record vs. FFT Frequency Domain Record
The following topics contain information to help you display your FFT properly.
Offset, Position, and Scale
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