Common Measurement Settings
R&S
®
FSMR3000
157
User Manual 1179.0116.02 ─ 02
Squelch Level
Defines the level threshold below which the demodulated data is set to 0 if squelching
is enabled. The squelch level is an absolute value.
Remote command:
AF Coupling
Controls the automatic correction of the frequency offset and phase offset of the input
signal:
This function is only available for FM or PM time domain evaluations.
●
FM time evaluation
If DC is selected, the absolute frequency is displayed, i.e. an input signal with an
offset relative to the center frequency is not displayed symmetrically with respect to
the zero line.
If AC is selected, the frequency offset is automatically corrected, i.e. the trace is
always symmetric with respect to the zero line.
●
PM time evaluation
If DC is selected, the phase runs according to the existing frequency offset. In addi-
tion, the DC signal contains a phase offset of ± π.
If AC is selected, the frequency offset and phase offset are automatically corrected,
i.e. the trace is always symmetric with respect to the zero line.
Remote command:
Time Domain Zoom
Using the time domain zoom, the demodulated data for a particular time span is extrac-
ted and displayed in more detail. This is useful if the measurement time is very large
and thus each sweep point represents a large time span. The time domain zoom func-
tion distributes the available sweep points only among the time span defined by the
zoom area length. The time span displayed per division of the diagram is decreased.
Thus, the display of the extracted time span becomes more precise. Note that the time
domain zoom area affects not only the diagram display, but the entire evaluation for the
current window.
This function is only available for evaluations in the time domain.
Tip:
In addition to the Time Domain Zoom, a graphical zoom is available for all diagram
evaluations. However, the graphical zoom is useful only if more measured values than
trace points are available. The (time) span represented by each measurement point
remains the same.
For details see
Chapter 8.2.2, "Zoom Functions"
State ← Time Domain Zoom
Activates or deactivates the time domain zoom mode.
"On"
Activates the time domain zoom.
"Off"
Deactivates the time domain zoom and restores the original display. If
more measured values than measurement points are available, sev-
eral measured values are combined in one measurement point
according to the method of the selected trace detector.
Demodulation
