Agilent Technologies PNA Series

Service Guide E8361-90001 A-13
PNA Series Microwave Network Analyzers Error Terms
E8361A Error Term Data
Reflection Tracking (E
RF
and E
RR
)
Reflection tracking is the difference between the frequency response of the reference path
(R1 or R2path) and the frequency response of the reflection test path (A or B input path).
These error terms are characterized by measuring the reflection (S
11
, S
22
) of the open and
the short during the measurement calibration.
All reflection measurements are affected by the reflection tracking errors.
Typical Cause of Failure
The calibration kit open or short is the most common cause of reflection tracking
specification failure.
If the open or short performance has been independently verified, suspect the following:
•If both E
RF
and E
RR
fail
— suspect the analyzer switch splitter
• If one of the track term specification fails
—suspect the coupler, step attenuator, or the test receiver of the failed port
To troubleshoot, refer to “Checking the Receiver Group” on page 4-52 or to “Checking the
Signal Separation Group” on page 4-49.
Figure A-6 Typical E
RF
/E
RR