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3 Spectrum Analyzer Mode

3.2 Swept SA Measurement

Mixing is ON. Since all this happens between sweeps, you never see the instrument

retuning to do the counts.

If you wish to see the entered frequency of a counted marker it will appear in the

active function area when that marker is selected (for Fixed markers, you must press

Marker, Fixed to select Fixed markers, then press it a second time to view or adjust

the x or y marker values).

Counting Off-screen Markers

If the selected marker is Off, the X-axis the instrument can still be tuned to the

marker (unless it is outside the current range of the instrument), so the count can

still be displayed. This means you can see a count for an off-screen marker, even

though there may be no valid Y-value for the marker. If the marker frequency is

outside the range of the instrument, the display shows three dashes in the count

block (---), and Not a Number (NAN) is returned to a SCPI count query.

Delta Marker

When a Delta Marker is selected while Marker Count is ON:

–

If the reference marker is not a Fixed marker, the display shows the difference

between the count of the selected marker and the count of the reference marker

–

If the reference marker is a Fixed marker and there is a count stored in the

marker (because Marker Count was ON when the marker became a Fixed

marker), the display shows the difference between the count at the marker and

the count stored in the reference marker

Marker Count works in Zero Span as well as in Swept SA. The instrument tunes to

the frequency of the selected marker, which, for active zero span traces, is simply

the center frequency of the instrument.

Fixed Markers

Fixed markers have a count stored in them that is generally kept fixed and not

updated. If a Fixed marker is selected, or used as a reference, the signal at the

marker frequency is not counted; rather the stored count is seen or used as the

reference. The count is stored, if Count is ON, when the marker becomes Fixed or

when, while Fixed, the marker is moved by re-zeroing the reference (if it is the

reference marker) or via a peak search (since both, by definition, use valid trace

data). The count stored in a Fixed marker is lost if the counter is turned off, if the

marker is moved to an inactive trace, or if the marker is moved by adjusting its x-

value.

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

Keysight x-series User Manual

Other manuals for Keysight x-series