Rohde & Schwarz SMBV100A, Руководство пользователя

Страница: 212 / 780

Instrument Function
R&S
®
SMBV100A
195 Operating Manual 1407.6062.32 ─ 08
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 1 GHz 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 624
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.
SCPI command:
​
[:
​
SOURce]:
​
LFOutput:
​
FREQuency
​
on page 648
LF Gen Shape
Selects the waveform shape of the LF signal.
SCPI command:
​
[:
​
SOURce]:
​
LFOutput<ch>:
​
SHAPe
​
on page 655
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 625
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 457
FM External Coupling
(Source External only)
Selects the coupling mode (AC or DC) for external feed.
RF Signal and Analog Modulations - RF Block