VXI 3002 - Manual (Page 44)

3-14
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