Service Guide E8361-90001 A-11
PNA Series Microwave Network Analyzers Error Terms
E8361A Error Term Data
Source Match (E
SF
and E
SR
)
E
SF
and E
SR
are the forward and reverse uncorrected source match terms of the driven
port. They are obtained by measuring the reflection (S
11
, S
22
) of an open, and a short that
are connected directly to the ports. Source match is a measure of the match of the coupler,
as well as the match between all components from the source to the output port.
The measurements most affected by source match errors are reflection and transmission
measurements of highly reflective DUTs.
Typical Cause of Failure
The calibration kit open or short is the most common cause of source match specification
failure.
If the open or short performance has been independently verified, then suspect the
analyzer switch splitter, step attenuator, or coupler.
To troubleshoot, refer to “Checking the Signal Separation Group” on page 4-49.
Figure A-4 Typical E
SF
/E
SR
Without Cables
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