Instrument Function
R&S
®
SMBV100A
256Operating Manual 1176.8016.02 ─ 17
Remote command:
[:SOURce<hw>]:FM:SENSitivity? on page 733
Adjust FM Offset
Starts the adjustment for the FM/PhiM modulator. The option is adjusted concerning
DC-offset.
Remote command:
:CALibration<hw>:FMOFfset[:MEASure]? on page 546
FM External Coupling
(Source "External" only)
Selects the coupling mode (AC or DC) for the externally applied frequence modulation
signal.
Note: Coupling for external feed via input EXT MOD can be set independently for all
modulations using the external modulation signal.
"AC"
Disconnects the DC voltage component and uses only the AC com-
ponent of the modulation signal.
"DC"
Uses the modulation signal with both components, AC and DC.
Remote command:
[:SOURce<hw>]:FM:EXTernal:COUPling on page 731
Ext. Impedance
(Source "External" only)
Sets the impedance for the external modulation signal, applied at the EXT MOD con-
nector.
You can select 600 Ohm or high (>100 kOhm).
This setting affects all analog modulations which use the external modulation signal.
Remote command:
[:SOURce<hw>]:INPut:MODext:IMPedance on page 743
5.5.12.4 Phase Modulation (PhiM)
It is not possible to use phase modulation simultaneously with frequency modulation.
See "Simultaneous Operation of Several Modulations or Other Operating Modes"
on page 250 for an overview in detail.
An internal and/or external source can be selected for phase modulation. The LF GEN
modulation generator is available as the internal source.
The EXT MOD and PULSE EXT input connectors for external feed of analog modula-
tion signals are at the rear of the instrument. The coupling mode of the input (AC or
DC) and the impedance can be selected.
Selection between the following modulation modes is possible:
●
"Normal" mode with full setting range for modulation bandwidth and ɸM deviation.
RF Block
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