A-14 Service Guide E8361-90001
Error Terms PNA Series Microwave Network Analyzers
Error Term Data E8361A
Transmission Tracking (E
TF
and E
TR
)
Transmission tracking is the difference between the frequency response of the reference
path (including the R input) and the frequency response of the transmission test path
(including the A or B input) while measuring transmission. The response of the test port
cables is included. These terms are characterized by measuring the transmission (S
21
, S
12
)
of the “thru” configuration during the measurement calibration.
All transmission measurements are affected by transmission tracking errors.
Typical Cause of Failure
The test port cable is the most common cause of transmission tracking specification failure.
If the test port cable performance has been independently verified, suspect the following:
•If both E
TF
and E
TR
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-7 Typical E
TF
/E
TR
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