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SDS2000X HD Series Digital Oscilloscope User Manual
i n t . s i g l e n t . c o m 1 9 1
Frequency Analysis
The result of FFT (Fast Fourier Transform) calculations is the frequency spectrum of the source signal.
The horizontal axis of the FFT display is labeled using frequency (Hz) units instead of time (seconds).
In addition, the vertical axis provides the option of logarithmic scaling (dBVrms/dBArms or dBm).
A. Time-domain waveform display area
B. Spectrum (FFT) waveform display area
C. FFT parameter display area
D. Dialog box
Parameter Display Area
The FFT parameters are displayed in the upper right of the spectrum waveform display area:
FFT sample rate (Sa): FFT operation results present the first Nyquist zone (DC ~ Sa/2) of the
frequency spectrum. Be aware that the FFT sample rate may be inconsistent with the sample
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