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3 Spectrum Analyzer Mode

3.2 Swept SA Measurement

First, if Source Mode is set to “Tracking”: Use 1.0

Otherwise, go through the following list of detector numbers and find the lowest

numbered detector being used on any active traces (traces for which Update is On):

Peak

Normal

Average

Sample

Negative Peak

EMI Average

Quasi Peak

RMS Average

Use that detector to pick the ratio based on the following criteria:

If the measurement supports EMC Standard, and the detector is Peak and the

EMC Standard is set to either CISPR or MIL, use 10.0 (we use wide VBWs to

capture peak levels accurately)

Otherwise, if the detector is Negative Peak, use 1.0 (in the Negative Peak case,

there are no known significant use models, so we use a medium ratio)

Otherwise, if the detector is Normal, use 1.0

Otherwise, if the detector is Average, and the span is nonzero, use 0.1. The use of

a small ratio in Average detection is desirable because of its effect on the sweep

time equations. The VBW filter is not actually in-circuit when the average

detector is on. If the detector is Average, and the span is zero, use 10.0, which

gives optimal behavior for Interval Markers in zero span. Note that only the

Swept SA measurement supports Zero Span

Otherwise, if the detector is EMI Average, Quasi Peak or RMS Average, use 10.0.

In fact, this is a “don’t care” since no VBW is used for these detectors, as noted

under “Dependencies” for the VBW control

Otherwise, the detector is simply Peak or Sample. These two detectors can use

the same rules. In these cases, if any active trace is in max hold or min hold, use

10.0, because Max and Min Hold operations will usually be intended to capture

peaks and pits without smoothing from the VBW filter; otherwise, use 1.0 as a

compromise, because you have not set the instrument in a way that implies that

you are measuring noise, pulsed-RF or CW signals, and for backward

compatibility with earlier instruments

252 Spectrum Analyzer Mode User's &Programmer's Reference

Keysight x-series User Manual

Other manuals for Keysight x-series