Giga-tronics 8003, Operation Manual

Page: 163 / 258

Remote Operation
Manual 20791, Rev. C, June 2001 3-21
3.3.13 Fixed Frequency Source Mode Definition Command
Structure
FIXED
Syntax: FIXED [u s modifier]..[ us modifier]
Examples: (See page 3-66 in the SWPF command description for a more complete programming
example of the UPD modifier.)
Related Command:
POWER
Modifiers: This modifier defines a CW frequency for the FIXED frequency mode of signal source.
The query flag (‘?’) affixed to the cw frequency modifier queries the value of the cw
frequency. If set, the next time the 8003 is talk addressed it will output the value of the cw
frequency in MHZ. The format of the returned data is:
D.dddddd: Where D is zero to 6 digits and the assumed units are MHZ
Modifier name: FREQ, FREQ?, FR, FR?, CW, CW?
Modifier Syntax: CW[?] [ ds numerical value]
Numerical value range: Dependent upon the signal source if the source is
supported on the 8003 private bus. If not supported, the
range is 1 MHZ to 99 GHZ
This modifier defines a POWER LEVEL for the fixed
frequency mode of signal source. The query flag (‘?’)
affixed to the power level modifier queries the value of
the power level. If set, the next time the 8003 is talk
addressed it will output the value of the power level in
dBm.
The resolution is 0.01 dBm. The format of the returned
data is:
±
D.dd
where D is zero to three digits and the assumed units
are dBm
Modifier name: LEVEL, LEVEL?, PL, PL?
Modifier Syntax: PL[?] [ ds numerical value]
Numerical value range: Dependent upon the signal source if the source is
supported upon the 8003 private bus. If not supported
then the range is -99 to +99 dBm.
The update modifier decouples analyzer frequency
updates from sweeper frequency updates. This is most
commonly used when the analyzer and sweeper are set
to different frequencies, as in mixer or frequency
multiplier measurements. The analyzer normally uses
frequency information to change the operating frequen-
cies of the sweeper, annotate x-axis of the swept