Detector PROM Correction: External Frequency
(V/GHz/Freq Ref)
FPRVvv.vv,ss.ss,mm.mm
(Where v, s and m are the arguments to scale the voltage input at the PPM FREQUENCY INPUT
connection.)
Correction to be applied for the frequency response of the detector will be determined from three
user-supplied values to properly reference data in the PROM in the detector. The three arguments are
respectively:
A. A coefficient representing the voltage proportional to frequency of the sweeper’s V/GHz or Freq Ref
output:
Min Value: 0.10V/GHz
Max Value: 10.00V/GHz
The most common values for this coefficient are 0.5 and 1.00V/GHz. Consult the instruction manual
for the sweeper being used to obtain the correct coefficient.
B. The minimum coefficient voltage corresponding to the minimum frequency of the sweeper:
Min Value: 0.0V
Max Value: +19.000V
Example: If the sweeper’s V/GHz is 0.5V and the minimum start frequency is 2.0 GHz, then this
value would be 2 x 0.5 = 1V.
C. The minimum frequency of the sweeper:
Min Value: 0 GHz
Max Value: 110.00 GHz
Sample Program:
10 ! PPM EXTERNAL FREQUENCY MODE
20 G=5 ! VOLTS/GHZ
30 V=1 ! V/GHZ START FREQUENCY
40 F=2 ! SWEEPER START FREQUENCY
50 OUTPUT 704 USING 60;FPRV,G,V,F
60 IMAGE 4A,3(DD.DD)
70 END
Series 8500A Peak Power Meters
3-18
Manual No. 20790, Rev C, November 1998
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