VXI 3002 - Manual (Page 36)

3-6
Carrier frequency
These commands enable you to set the carrier frequency in the range 9 kHz to 2.4 GHz to a
resolution of 1 Hz. You can adjust the frequency in steps by setting the size of the step and then
stepping the frequency up or down. After having adjusted the frequency you can either return to
the reference frequency or make the current frequency the reference frequency. Additionally, you
can adjust the phase offset of the carrier in degrees in the range -359.99° to +359.99°. Also you
can configure the instrument as a swept frequency signal generator where you define the start and
stop frequencies and set the step size, step time and step direction. For triggering methods, refer to
'Trigger source' at the end of this section.
CFRQ Set Carrier Frequency (short form)
:VALUE Set Carrier Frequency
:INC Set Carrier 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
Data type : None
Allowed suffices : None
Default suffix : None
:MODE Selects the mode of carrier frequency operation. SWEPT enables swept
carrier frequency operation, while FIXED disables it
Data type : Character Program Data (FIXED - non swept mode, SWEPT - swept
mode)
Allowed suffices : None
Default suffix : None
:START Set Start Frequency for use in sweep
:STOP Set Stop Frequency for use in sweep
Data type : Decimal Numeric Program Data
Allowed suffices : Any one of: GHZ, MHZ, KHZ or HZ
Default suffix : HZ
:TIME Set time per sweep step
Data type : Decimal Numeric Program Data
Allowed suffices : MS or S
Default suffix : MS
:PHASE Adjust Phase Offset of Carrier in degrees
Data type : Decimal Numeric Program Data
Allowed suffices : DEG
Default suffix : DEG
Examples: CFRQ:VALUE 2.54MHZ;INC 10KHZ
CFRQ:UP;XFER
CFRQ:START 1MHZ;STOP 10MHZ;TIME 100MS
CFRQ:MODE SWEPT
CFRQ? Prepares message containing information on Carrier Frequency setting
in the following format:
:CFRQ:VALUE <nr2>; INC <nr2>;MODE<mode>
where: <mode> is character program data indicating whether carrier
frequency operation is swept or fixed
Example: :CFRQ:VALUE 1000000000.0;INC 25000.0;MODE FIXED