Instrument Function
R&S
®
SMC100A
176Operating Manual 1411.4060.32 ─ 09
The configuration of the selected external or internal modulation source is performed in
the lower section of the "LF Output" dialog (internal source only) or in the "Mod Gen"
block.
These settings affect all modulations which use the same modulation sources.
An LF generator and a pulse generator are available as internal sources.
State
Activates ɸM modulation.
Activation of ɸM deactivates frequency modulation.
Remote command:
[:SOURce<hw>]:PM:STATe on page 312
ɸM Source
Selects the source for the ɸM signal.
"Internal"
Uses the internal LF generator as the modulation signal source for
ɸM.
"External"
Uses an externally applied modulation signal.
The external signal is input via the MOD EXT connector.
Remote command:
[:SOURce<hw>]:PM:SOURce on page 312
ɸM Deviation
Sets the modulation deviation in RAD.
The maximum deviation depends on the set RF frequency and the selected modulation
mode (see data sheet).
If the entered deviation is too high for the set RF frequency, the instrument provides
the maximum value and displays an error message. The same applies, if the RF fre-
quency is set to a value, at which the deviation cannot be determined.
Remote command:
[:SOURce<hw>]:PM[:DEViation] on page 310
[:SOURce<hw>]:PM:INTernal:DEViation on page 311
[:SOURce<hw>]:PM:EXTernal:DEViation on page 311
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
ɸM Sensitivity
Displays the input sensitivity of the externally applied modulation signal at the MOD
EXT input in RAD/V.
The modulation deviation entered with ɸM Deviation"ɸM Deviation" is achieved with 1
Volt (=U
peak
) of the input signal.
Modulation
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