Hardware Reference
In-Depth Information
Figure 11.13 Frequency spectrum of a 1 kHz square wave generated by a
waveform generator. The instrument is set to capture 2048 samples per
second. The increased frequency resolution of the instrument is now showing
us how the noise spectrum is actually modulated onto the fundamental and
harmonic components. This was simply not apparent in the spectra shown in
Figures 11.11 and 11.12
Figure 11.14 Frequency spectrum of a 1 kHz square wave generated by a
waveform generator. The instrument is set to capture 4096 samples per
second. It is now easy to see how the modulated spectrum varies
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