R&S SMB Command Description
1407.0806.32 6.63 E-2
SOURce:PM Subsystem
The PM subsystem contains the commands for checking the phase modulation. The PhiM-specific
characteristics of the internal modulation source are defined with commands
SOURce:PM:INTernal:... Characteristics which are valid for all modulations and the LF Output are
configured in the SOURce:LFOutput subsystem (e.g. frequency). The external signal is input at the
MOD EXT connector.
Command Parameters Default unit Remark
[SOURce:]PM[:DEViation] 0 ...20 RAD RAD
[SOURce:]PM:EXTernal:COUPling AC | DC
[SOURce:]PM:EXTernal:DEViation 0 ...20 RAD RAD
[SOURce:]PM:INTernal<1|2>:DEViation 0 Hz…40 MHz Hz
[SOURce:]PM:MODE NORMal | HDEViation |
LNOise
[SOURce:]PM:SENSitivity? 0 Hz…40 MHz Hz Query only
[SOURce:]PM:SOURce EXT | INT | INT, EXT
[SOURce:]PM:STATe ON | OFF
[SOURce:]PM[:DEViation] 0 ... 20 RAD
The command sets the modulation deviation of the phase modulation in RAD. The maximal
deviation depends on the RF frequency set and the selected modulation mode (see data sheet).
The deviation of the internal source must not exceed the deviation of the external source in case of
modulation source Int+Ext (PM:SOURce INT,EXT).
Example:
PM 5E3
'sets the PM modulation deviation to 5 RAD.
*RST value Resolution Options SCPI
1 RAD See data sheet Compliant
[SOURce:]PM:EXTernal:COUPling AC | DC
The command selects the coupling mode for the external modulation input (EXT MOD) in the case
of phase modulation.
Note:
Coupling for external feed via input MOD EXT can be set independently for modulations FM and
PhiM.
Parameters: AC
The DC voltage component is disconnected from the modulation signal.
DC
The modulation signal is not changed.
Example:
PM:EXT:COUP AC
'selects the coupling mode AC for external phase modulation.
*RST value Resolution Options SCPI
AC - Compliant
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