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zero span
The case in which an analyzer's local oscillator remains fixed at a given
frequency so that the analyzer becomes a fixed-tuned receiver. In
this state, the bandwidth is equal to the resolution bandwidth. Signal
amplitude variations are displayed as a function of time. To avoid 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.
Glossary- 18
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