Chapter 4 — Spectrum Analyzer 4-21 Amplitude
MS20xxA VNA Master UG 10580-00166 Rev. C 4-25
Peak
This method causes the largest measurement point to be shown for each display
point, and assures that a narrow peak is not missed.
RMS
This method performs a root-mean-square calculation of all the measurement
points in each display point. It is particularly useful in displaying the average
value of noise.
Negative
This method causes the smallest measurement point to be shown for each display
point. Typically this mode is used to help detect small discrete signals in the
presence of nearly equal values of noise. The display points that contain only
noise will tend to show lower amplitudes than those that contain discrete signals.
Sample
This is the fastest detection method since for each display point only one
frequency point is measured. Use this method when speed is of paramount
importance and the possibility of missing a narrow peak is not important.
Quasi-peak
When this selection is made, resolution bandwidths and video bandwidths of
220 Hz, 9 kHz and 120 kHz are available. This detection method is designed to
meet CISPR requirements.
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