1-10 Keysight M937xA PXIe Service Guide
General Product Information
Error Terms
1-
Directivity (E
DF
and E
DR
)
E
DF
and E
DR
are the uncorrected forward and reverse directivity error terms of
the system. The directivity error of the test port is determined by measuring the
S
11
and S
22
reflection of the calibration kit load. The load has a much better
return loss specification than does the uncorrected text port. Therefore, any
power detected from this measurement is assumed to be from directivity error.
The measurements most affected by directivity errors are measurements of low
reflection devices.
Typical Cause of Failure
The calibration kit load is the most common cause of directivity specification
failure.
If the load has been gaged and its performance independently verified, the
analyzer requires repair. Refer to “Shipping Your Network Analyzer for Service
or Repair” on page 1-3.
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 measurement 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 are independently verified, the analyzer
requires repair. Refer to “Shipping Your Network Analyzer for Service or
Repair” on page 1-3.
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, 2-port
device, such as an airline.
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