R&S FSL Analog Demodulation (Option K7)
1300.2519.12 4.147 E-11
Reference Position
Determines the position of the reference line for the modulation depth or the phase or frequency
deviation on the y–axis of the diagram. By default, this line is set to 0.
The position is entered as a percentage of the diagram height with 100 % corresponding to the
upper diagram border. The default setting is 50 % (diagram center) for the display of the AM,
FM, or PM signal, and 100% (upper diagram border) for the AF spectrum display of the AM, FM,
or PM signal.
Remote: DISP:TRAC:Y:RPOS 50PCT
Reference Value
Determines the modulation depth or the frequency or phase deviation at the reference line of the
y–axis. The reference value is set separately for each display of the AM, FM, and PM signal and
the AF spectrum of the AM, FM, and PM signal.
– AM/FM/PM signal display
The trace display takes individual frequency/phase offsets into account (in contrast, the AF
Coupling AC/DC softkey permits automatic correction by the average frequency/phase offset
of the signal, and can therefore not be activated simultaneously).
Possible values: 0 and
10000% (AM), 0 and
10 MHz (FM), 0 and
10000 rad (PM).
– AF spectrum display of the AM/FM/PM signal
In the default setting, the reference value defines the modulation depth or the FM/PM deviation
at the upper diagram border.
Possible values: 0 and 10000% (AM), 0 and 10 MHz (FM), 0 and 10000 rad (PM).
Remote: DISP:TRAC:Y:RVAL 0HZ
Deviation Lin/Log
Switches between logarithmic and linear display of the modulation depth or the frequency or
phase deviation.
Remote: DISP:TRAC:Y:SPAC LOG
Demod Settings
Opens a submenu for the demodulation settings.
AF Coupling AC/DC
Controls the automatic correction of the frequency offset and phase offset of the input signal:
– FM signal display
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 signal display
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