Rohde & Schwarz R&S FSP Series, Operating Manual

Page: 139 / 796

Operating Manual 1164.4556.12 - 06 4.67
R&S FSP Instrument Functions
Analyzer Mode
The MARKER DEMOD softkey switches on the audio demodulator and calls a sub-
menu in which the demodulation mode and the duration of the demodulation can be
selected.
Remote command:
CALC:MARK1:FUNC:DEM ON
MKR DEMOD
(ON OFF)
The MKR DEMOD (ON OFF) softkey switches the demodulation on/off.
In the frequency range (span >0), the frequency scan is stopped at the frequency of
the active marker with demodulation switched on – provided that the level is above
the threshold line - and the signal is demodulated during the given stop time.
In the time domain (span = 0) demodulation is continuous, i.e. not only active at the
marker position.
Remote command:
CALC:MARK1:FUNC:DEM ON
AM | FM The softkeys AM and FM are selector switches one of which only may be active at a
time. They set the desired demodulation mode FM or AM. Default setting is AM.
Remote command:
CALC:MARK1:FUNC:DEM:SEL AM
CALC:MARK1:FUNC:DEM:SEL FM
SQUELCH The SQUELCH softkey enables the input of a level threshold below which the audi-
ble AF is cut off. The squelch function is associated with the internal trigger function
(
TRIGGER menu), which will be switched on automatically with the squelch.
Squelch level and trigger level do have the same value.
The default setting for the squelch is off.
Remote command:
CALC:MARK1:FUNC:DEM:SQU ON | OFF
CALC:MARK1:FUNC:DEM:SQU:LEV 80 PCT
MKR STOP
TIME
The MKR STOP TIME softkey defines the stop time for demodulation at the
marker(s).
The R&S FSP interrupts the frequency sweep at the marker position and activates
the demodulation for the duration of the stop time (see also
MKR DEMOD ON/OFF ).
In the time domain (span = 0) the demodulation is continuously active irrespective of
the stop time set.
Remote command:
CALC:MARK1:FUNC:DEM:HOLD 3s
CONT DEMOD The CONT DEMOD softkey switches on the continuous demodulation in the fre-
quency domain. If the sweep time is long enough, the set frequency range can be
monitored acoustically.
Remote command:
CALC:MARK1:FUNC:DEM:CONT ON
4.5.11.7 Selecting the Trace
MKR
−>
TRACE
The MKR->TRACE softkey sets the active marker to different traces. Only those
traces can be selected which are visible on the screen in the same window.
The function of the softkey is identical to that of the softkey with the same name in
the
MKR-> menu.