Agilent Technologies 8719ES User Manual page 351

You should perform the isolation measurement when the highest dynamic
NOTE
range is desired.
To perform the best isolation measurements, you should reduce the system
bandwidth or activate the averaging function.
A poorly measured isolation class can actually degrade the overall
measurement performance. If you are in doubt of the isolation measurement
quality, you should omit the isolation portion of this procedure.
14.You may repeat any of the previous steps. There is no requirement to go in the order of
steps. When the analyzer detects that you have made all the necessary measurements,
the message line will show PRESS 'DONE' IF FINISHED WITH CAL. Press
DONE TRL/LRM
The message COMPUTING CAL COEFFICIENTS will appear, indicating that the analyzer is
performing the numerical calculations of error coefficients.
You can save or store the measurement correction to use for later
NOTE
measurements. Refer to
Measurement Results"
15.Connect the device under test. The device S-parameters are now being measured.
NOTE When making measurements using the same port with uncoupled channels,
the power level for each channel must fall within the same power range
setting of that single port. An error message will be displayed if you enter two
power levels that do not fall within the same power range.
.
Chapter 4 , "Printing, Plotting, and Saving
for procedures.
Calibrating for Increased Measurement Accuracy
LRM Error Correction
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