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Instrument Function

R&S

SMB100A

205Operating Manual 1407.0806.32 ─ 21

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 286

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 MOD EXT 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 337

Ext. Impedance

(Source "External" only)

Sets the impedance for the external modulation signal, applied at the MOD EXT 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 347

Ignore Overvoltage Warning

Suppresses warnings the instrument generates when the modulation signal input is

overloaded.

This function prevents a warning caused by signals, that generally comply with the

specification, but temporarily overload the input, for example due to spikes. The warn-

ing is suppressed in the history, and in the error queue.

Note: This setting is not affected by an instrument preset (PRESET key), *rst or the

Save/Recall function. Only the factory preset resets (enables) this setting.

Remote command:

[:SOURce<hw>]:INPut:MODext:WIGNore on page 348

Modulation

R&S SMB100A User Manual

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