R&S FSMR, Operating Manual, Page: 192 / 955

R&S FSMR Measurement Receiver Mode
1166.3363.12 4.4-36 E-2
10dB MIN
ON OFF
The 10 dB MIN ON/OFF softkey determines whether or not the
0 dB position of the attenuator is used when setting the
insertion manually or automatically.
The default setting is 10 dB MIN ON.
Thus, an RF attenuation of at least 10 dB is always switched on
in the R&S FSMR to ensure specific adjustment.
Even manually, the 0 dB position cannot be switched on.
IEC/IEEE bus command:
INP:ATT:PROT:STAT ON
AUTOPREAMP
ON OFF
The AUTO PREAMP ON/OFF softkey activates the preamplifier
for the autorange function.
ON The autorange function takes the preamplifier into
account. The preamplifier is activated only when the
attenuation of the attenuator has been reduced to
the minimum settable value.
OFF The autoranging does not take into account the
preamplifier.
The softkey is only available with the R&S FSU-B23/B25
preamplifier option.
IEC/IEEE bus command:
INP:GAIN:AUTO ON
RANGE
The RANGE softkey opens a submenu for configuring the y axis in the graphical
display of the modulation measurement results.
DEVIATION
PER DIV
The DEVIATION PER DIV softkey allows you to select the phase
or frequency deviation that is to be displayed in the range from
1 Hz/div to 1 MHz/div with FM display or from 0.0001 rad/div to
1000 rad/div with PM display. In the AM display, the modulation
depth is set in the range from 0.0001%/div to 1000%/div.
To ensure that the measurement results are not distorted,
select an analyzer IF bandwidth that is larger than the maximum
frequency deviation plus modulation frequency
(
IF BANDWIDTH softkey in the BW menu).
The softkey is not available in the AF spectrum display because
scaling here is effected via the
DB PER DIV and REFERENCE
VALUE softkeys.
IEC/IEEE bus command:
DISP:WIND:TRAC:Y:PDIV 50kHz
REFERENCE
POSITION
The REFERENCE POSITION softkey defines the position of the
reference line for the phase or frequency deviation (FM/PM) or
the modulation depth (AM) on the y axis of the diagram. In the
analyzer’s default setting, this line corresponds to a frequency
deviation of 0 Hz (FM) or a phase deviation of 0 rad (PM) or a
modulation depth of 0% (AM).
The entry is in percentage of the diagram height, where 100%
corresponds to the top edge of the diagram. The default setting
is 50% (diagram center) for displaying the FM, PM or AM signal,
and 100% (top edge of diagram) for displaying the AF spectrum
of the signal.
IEC/IEEE bus command:
DISP:WIND:TRAC:Y:RPOS 50PCT