Instrument Function
R&S
®
SMC100A
150
Operating Manual 1411.4060.32 ─ 04
These settings affect all modulations which use the same modulation sources.
State
Activates/deactivates FM modulation.
Activation of FM deactivates phase modulation.
SCPI command:
FM Source
Selects the source for the FM signal.
"Internal"
Selects the internal LF generator as the source for FM modulation.
"External"
Selects the external source.
The external signal is input via the MOD EXT connector.
SCPI command:
FM Deviation
Sets the modulation deviation in Hz.
The maximal deviation depends on the RF frequency set and the selected modulation
mode (see data sheet). It is possible to enter a deviation that is too high for a certain RF
frequency or to vary the RF frequency to a range in which the deviation can no longer be
set. In this case the maximally possible deviation is set and an error message is displayed.
SCPI command:
LF Gen Frequency
Sets the frequency of the LF generator.
This setting affects all analog modulations which use the LF generator as the internal
modulation source.
SCPI command:
FM Sensitivity
(Source External only)
Displays the input sensitivity of the MOD EXT input in Hz/V.
The modulation depth entered under "FM Depth" is reached with 1 Volt (= U
peak
) of the
input signal.
Modulations
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