Instrument Function
R&S
®
SMB100A
204Operating Manual 1407.0806.32 ─ 21
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.
In "Int + Ext" modulation source mode, the instrument devides the deviation into half for
each source.
Remote command:
[:SOURce<hw>]:FM[:DEViation] on page 337
[:SOURce<hw>]:FM:INTernal:DEViation on page 338
[:SOURce<hw>]:FM:EXTernal:DEViation on page 338
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 349
LF Gen Shape
Selects the waveform shape of the LF signal.
Note: The installed hardware determines the available settings. Use the Hardware
Config dialog to check the hardware the instrument is equipped with.
For information on the required hardware revision, refer to the release notes.
Remote command:
[:SOURce]:LFOutput:SHAPe on page 357
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 339
Modulation
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