A-12 Service Guide E8361-90001
Error Terms PNA Series Microwave Network Analyzers
Error Term Data E8361A
Load Match (E
LF
and E
LR
)
Load match is a measure of the impedance match of the test port that terminates the
output of a 2-port device. The match of test port cables is included in this response. Load
match error terms are characterized by measuring the S
11
and S
22
responses of a “thru”
configuration during the calibration procedure.
The measurements most affected by load match errors are all transmission measurements,
and reflection measurements of a low insertion loss two-port device, such as an airline.
Typical Cause of Failure
The calibration kit load or a bad “thru” cable is the most common cause of load match
specification failure.
If the load and cable performance are independently verified, then suspect the analyzer
test port coupler, step attenuator, or the test receiver at the bad 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-5 Typical E
LF
/E
LR
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