58542 VXIbus Universal Power Meter
2-28 Publication 21555, Rev. E, September 2002
Frequency response variations (which are reflected in Cal Factors in Giga-tronics sensors) do not
change appreciably over small frequency ranges. That is, the frequency sent to the power meter does not
need to be exact. If the actual measurement frequency is within about 40 MHz of the value sent to the
power meter, measurement variation due to this discrepancy will typically be less than 0.02 dB, well
below typical RSS measurement accuracy levels.
NOTE: Example programs for Cal Factor Corrections are contained in AppendixA of
this publication.
MEM:FREQ
Syntax:
MEMory[:TABLe]:FREQuencyspace<Start frequency>
Example:
OUTPUT @PWR_MTR;MEM:FREQ 1E9 ! SETS V
PROP
F FREQUENCY TO 1 GHZ
Description:
This command sets the automated V
PROP
F correction start frequency. The frequency at
which the voltage input into the 58542 is 0.0 V.
Syntax:
MEMory[:TABLe]:FREQuency?
Example:
OUTPUT @PWR_MTR;MEM:FREQ? ! QUERIES V
PROP
F START FREQUENCY
Description:
This V
PROP
F command reports the start frequency setting.
MEM:SEL
Syntax:
MEMory[:TABLe]:SELectspace<ANALOGout,VPROpf1,VPROpf2>
Example:
OUTPUT @PWR_MTR;MEM:SEL VPROPF1 ! SELECTS MEMORY TABLE V
PROP
F1
! FOR EDITING IN FOLLOWING LINES
Description:
This command selects between one of three editable tables. Using the meter’s automated
V
PROP
F capability to correct for Cal Factor requires configuring the V
PROP
F IN connector to
match the signal that source will output. This is performed by setting the frequency so that
source’s V
PROP
F output is 0.0 V. Then the slope relationship is entered in the form of a value
representing the V/Hz relationship. If source is a Giga-tronics GT 9000 Series Signal
Generator, this relationship is 0.5 V/GHz or 5e-8 V/Hz.
Syntax:
MEMory[:TABLe]:SELect?
Example:
OUTPUT @PWR_MTR;MEM:SEL? ! QUERIES THE SELECTED MEMORY TABLE
Response:
Tables currently editable; ANALOG, VPROPF1 or VPROPF2
Description:
This command reports the currently active, editable table.
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