Command Description R&S SMB
1407.0806.32 6.64 E-2
[SOURce:]PM:EXTernal[:DEViation] 0 ... 20 RAD
The command sets the modulation deviation in case of external phase modulation in RAD. The
maximal deviation depends on the RF frequency set and the selected modulation mode (see data
sheet).
Example:
PM 5E3
'sets the PM modulation deviation for external phase modulation of 5 RAD.
*RST value Resolution Options SCPI
1 RAD See data sheet Compliant
[SOURce:]PM:MODE NORMal | HDEViation | LNOise
The command selects the mode for the phase modulation.
Parameters: HBANdwith
The maximum range for modulation bandwidth and PhiM deviation is
available.
HDEViation
The maximum range for PhiM deviation is available. Phase noise is improved
for low frequencies. The range for modulation frequency is limited (see data
sheet). This mode is recommended for low modulation frequencies and high
PhiM deviation.
LNOise
Phase modulation with phase noise and spurious characteristics close to CW
mode. The range for modulation bandwidth and PhiM deviation is reduced
(see data sheet).
Example:
PM:MODE HDEV
'selects high deviation mode for external phase modulation.
*RST value Resolution Options SCPI
NORMal - Compliant
[SOURce:]PM:SENSitivity?
The command queries the input sensitivity of the MOD EXT input in RAD/V. The command is only
effective if the external modulation source is selected (SOUR:PM:SOUR EXT). The returned value
depends on the modulation deviation setting (SOUR:PM:DEViation). This value is assigned to the
voltage value for full modulation of the input.
The command is a query command and therefore has no *RST value.
Example:
PM:DEV 1
'sets a modulation deviation of 1RAD.
PM:SENS?
'queries the input sensitivity at the EXT MOD input.
Response: 1
'since the voltage value for full modulation is 1V, the resulting sensitivity is
precisely 1RAD/V.
*RST value Resolution Options SCPI
- - Compliant
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