Instrument Function
R&S
®
SMU200A
243Operating Manual 1007.9845.32 ─ 15
"High Band-
width"
The maximum range for modulation bandwidth is available. However,
phase noise is increased for low frequencies. The range for PhiM devi-
ation is limited.
This mode is recommended for high modulation frequencies.
"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"
(with option R&S SMU-B22 only)
Phase modulation with phase noise and spurious characteristics close
to CW mode. The range for modulation bandwidth and PM deviation is
limited (see data sheet).
This mode is useful for generating a tailed CW signal.
SCPI command:
[:SOURce<hw>]:PM:MODE on page 762
PhiM Deviation
Sets the modulation depth in RAD or degrees.
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:
[:SOURce<hw>]:PM[:DEViation] on page 761
LF Gen Frequency
(Source Internal only)
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:
[:SOURce]:LFOutput:FREQuency on page 740
PhiM Sensitivity
The display only appears in the case of external modulation.
Displays the input sensitivity of the EXT MOD input in RAD/V.
The modulation depth entered under "PhiM Depth" is reached with 1 volt (=U
peak
) of the
input signal.
Note: The input voltage should not exceed 1.1 V
p
otherwise modulation distortions might
occur.
SCPI command:
[:SOURce<hw>]:PM:SENSitivity on page 763
Mod External Coupling
Selects the coupling mode (AC OR DC) for external feed.
RF Signal and Analog Modulations - RF Block
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