Instrument Function
R&S
®
SMU200A
240Operating Manual 1007.9845.32 ─ 15
"Low Noise"
(requires option R&S Signal Generator-B22)
Frequency modulation with phase noise and spurious characteristics
close to CW mode. The range for modulation bandwidth and FM devia-
tion is reduced (see data sheet).
SCPI command:
[:SOURce<hw>]:FM:MODE on page 708
FM Deviation
Sets the modulation deviation in Hz.
The deviation is given as the absolute deviation in relation to the set center frequency,
e.g. a deviation 5 MHz at a center frequency of 1GHz leads to a frequency modulation
between 995 MHz and 1005 MHz.
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.
The deviation of the internal source must not exceed the deviation of the external source
in case of modulation source "Int+Ext".
SCPI command:
[:SOURce<hw>]:FM[:DEViation] on page 708
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.
With two-path instruments, the setting affects both paths.
SCPI command:
[:SOURce]:LFOutput:FREQuency on page 740
FM Sensitivity
(Source External only)
Displays the input sensitivity of the EXT MOD input in Hz/V.
The modulation depth entered under "FM 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>]:FM:SENSitivity on page 709
Adjust FM Offset
Starts the adjustment for the FM/PhiM modulator. The option is adjusted with respect to
DC-offset.
SCPI command:
:CALibration<hw>:FMOFfset[:MEASure] on page 524
RF Signal and Analog Modulations - RF Block
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