Instrument Function
R&S
®
SMB100A
177Operating Manual 1407.0806.32 ─ 13
"External"
Selects the external source.
The external signal is input via the MOD EXT connector.
"Internal +
External"
Selects the internal and external source at the same time.
The external signal is input via the MOD EXT connector.
Remote command:
[:SOURce<hw>]:PM:SOURce on page 338
PhiM Mode
Selects the mode for the phase modulation.
"Normal"
The full range for modulation bandwidth and PM deviation is available.
"High Devia-
tion"
The maximum range for PhiM deviation is available. Phase noise is
improved for low frequencies compared to the default mode. The range
for modulation frequency is limited (see data sheet).
This mode is recommended for low modulation frequencies and/or high
PhiM deviation.
"Low Noise"
Phase modulation with phase noise and spurious characteristics close
to CW mode. The range for modulation bandwidth and PM deviation is
reduced (see data sheet).
Remote command:
[:SOURce<hw>]:PM:MODE on page 337
PhiM Deviation
Sets the modulation depth in RAD.
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.
Remote command:
[:SOURce<hw>]:PM[:DEViation] on page 335
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.
Remote command:
[:SOURce]:LFOutput<ch>:FREQuency on page 311
LF Gen Shape
Selects the waveform shape of the LF signal.
Note: The installed hardware determines the available settings. Use the Hardware Con-
fig dialog to check the hardware the instrument is equipped with.
Modulation
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