Agilent Technologies HP 8719D Service Manual page 323

Source Match (ESF and ESR)
Description
These are the forward and reverse uncorrected source match terms of the
driven port. They are obtained by measuring the reflection (Sll, S22) of
an open and then a short connected directly to the ports. Source match is a
measure of the match between the coupler and test set connector, as well as the
match between all components from the source to the output port.
Significant System Components.
important, as are the coupler and test port connectors. The power splitter, bias
tees, step attenuator, and transfer switch may also contribute to source match
errors.
Affected Measurements.
errors are reflection and transmission measurements of highly reflective DU'lk
Figure 11-2. Typical ESFIESR Without Cables
1 l-1 0 Error Terms
The open and short calibration devices are
The measurements most affected by source match