11-12 Service Guide
Error Terms 8719ET/20ET/22ET
Error Term Descriptions 8719ES/20ES/22ES
RF Network Analyzers
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 (S11, 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. The open and short calibration devices are 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. The measurements most affected by source match errors are
reflection and transmission measurements of highly reflective DUTs.
Figure 11-2 Typical ESF/ESR without Cables
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