Instrument Function
R&S
®
SMC100A
174Operating Manual 1411.4060.32 ─ 09
Remote command:
[:SOURce<hw>]:FM:SOURce on page 290
FM Deviation
Sets the modulation deviation in Hz.
The maximum deviation depends on the RF frequency and the modulation mode (see
data sheet).
Note that you can set a deviation that is too high for a specific RF frequency, or set an
RF frequency outside of the adjustable range of the deviation. In both cases, the instru-
ment sets the maximum deviation and displays an error message.
Remote command:
[:SOURce<hw>]:FM[:DEViation] on page 288
[:SOURce<hw>]:FM:INTernal:DEViation on page 289
[:SOURce<hw>]:FM:EXTernal:DEViation on page 289
LF Gen Freq
Sets the frequency of the LF generator.
This setting affects all analog modulations which use the LF generator as the internal
modulation source.
Remote command:
[:SOURce]:LFOutput<ch>:FREQuency on page 300
FM Sensitivity
Displays the input sensitivity of the externally applied modulation signal at the MOD
EXT input in Hz/V.
The modulation deviation entered with FM Deviation is achieved with 1 Volt (= U
peak
) of
the input signal.
Note: The input voltage must not exceed 1.1 V
p
otherwise modulation distortions
occur.
Remote command:
[:SOURce<hw>]:FM:SENSitivity? on page 290
Adjust FM Offset
Starts the adjustment for the FM/PhiM modulator. The option is adjusted concerning
DC-offset.
Remote command:
:CALibration<hw>:FMOFfset[:MEASure]? on page 240
FM External Coupling
(Source "External" only)
Selects the coupling mode (AC or DC) for the externally applied frequence modulation
signal.
Note: Coupling for external feed via input MOD EXT can be set independently for all
modulations using the external modulation signal.
"AC"
Disconnects the DC voltage component and uses only the AC com-
ponent of the modulation signal.
Modulation
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