Zero Span mode is not supported for Time Domain input mode.
Zero span is a mode of a spectrum analyzer in which the local oscillator (LO) does not sweep. The spectrum analyzer’s LO remains fixed at a given frequency so the analyzer becomes a fixed-tuned receiver. The bandwidth of the receiver is that of the resolution (IF) bandwidth. In case of zero span, signal amplitude (or power) variations are displayed as a function of time.
To avoid any loss of signal information, the resolution bandwidth must be as wide as the signal bandwidth. To avoid any smoothing, the video bandwidth must be set wider than the resolution bandwidth.
The following are the uses of zero span:
About Power Spectrum Measurements
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