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 |
