Keysight U8480 Series - Gamma Correction

15 Programming Examples
366 U8480 Series Programming Guide
Gamma Correction
The Gamma Correction feature enables you to correct for the impedance
mismatch between the Device-Under-Test (DUT) and the power sensor via Single
Point Gamma Correction or Table-Based Gamma Correction. For Single Point
Gamma Correction, the DUT Gamma you provide will be applied to measurement
correction across all frequencies in the sensor operating range. For Table-Based
Gamma Correction, you may provide a list of Gamma values for the desired
measurement frequencies. The programming sequence examples below describe
some simple commands to accomplish the following:
– Enter the Single Point Gamma
– Turn on Single Point Gamma Correction
The examples below describe some simple commands to accomplish the
following:
– Create a Gamma table
– Assign a Gamma magnitude-phase pair of values for a frequency value
– Turn on Table-Based Gamma Correction
-> SENS:CORR:SGAM:MAGN 0.2 // Sets DUT Gamma magnitude to 0.2
-> SENS:CORR:SGAM:PHAS –45 //
Sets DUT Gamma phase to –45
o
-> SENS:CORR:SGAM:STAT ON // Turns on Single Point Gamma
Correction
-> SENS:CORR:SGAM? // Queries the DUT Gamma currently
being used for measurement correction
->
MEM:TABL:SEL “Gamma1” // Selects the Gamma table named
“Gamma1”
->
MEM:TABL:FREQ 50MHz // Inputs a frequency of 50 MHz into the
selected table
->
MEM:TABL:SGAM 0.1,150 // Inputs the DUT Gamma
magnitude-phase pair values; 0.1 for
magnitude, and 150
o
for phase