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Phase modulation
These commands enable you to select phase modulation either as a single modulation or as the sum
of two signals, to set the deviation rate in radians, and to switch the modulation on and off. You
can set the modulation oscillator frequency and select between sine, triangle and square waveforms.
Also the phase difference of modulation oscillator channel 2 relative to channel 1 can be offset in
degrees. Both deviation rate and modulation oscillator frequency can have their step sizes set and
then be stepped up or down. And after having adjusted the deviation rate or the modulation
oscillator frequency you can either return to the reference (rate or frequency) or make the current
value the new reference.
PM or PM1 or PM2
Set Phase Modulation Deviation (short form)
:DEVN
Set Phase Modulation Deviation
:INC
Set Phase Modulation step size
Data type :
Decimal Numeric Program Data
Allowed suffix :
RAD
:<src>
Select modulation source where <src> is any one of: INT, EXTAC,
EXTALC, or EXTDC
:ON
Turn PM ON (locally)
:OFF
Turn PM OFF (locally)
:UP
Go UP one step
:DN
Go DOWN one step
:RETN
Return to original setting
:XFER
Transfer current value to be the new setting
Data type :
None
Allowed suffices :
None
Default suffix :
None
Examples: PM:DEVN 2.38RAD;INT;ON
PM1:DEVN 1.5RAD;INC 0.1RAD;EXTAC
:MODF
Set PM modulation oscillator frequency (short form)
:VALUE
Set PM modulation oscillator frequency
:INC
Set PM modulation oscillator frequency step size
Data type :
Decimal Numeric Program Data
Allowed suffices :
Any one of: GHZ, MHZ, KHZ or HZ
Default suffix :
HZ
:UP
Go UP one step
:DN
Go DOWN one step
:RETN
Return to original setting
:XFER
Transfer current value to be the new setting
:SIN
Select sinusoidal waveform
:TRI
Select triangle waveform
:SQR
Select square waveform
Data type :
None
Allowed suffices :
None
Default suffix :
None
:PHASE
Set phase offset of PM2 relative to PM1
Examples: PM1:MODF:VALUE 10.5KHZ;SQR
PM2:MODF:PHASE 2.0DEG