Frequency Drift; Performance Verification; Reference Plane And Port Extensions - HP 8753E User Manual

Frequency Drift

Minute changes in frequency accuracy and stability can occur as a result of temperature and
aging (on the order of parts per million). If you require greater frequency accuracy, do the
following:
your analyzer is equipped with Option lD5) use the internal frequency standard.

Performance Verification

You should periodically check the accuracy of the analyzer measurements, by doing the
following:
perform a measurement verification at least once per year
n
Refer to the HP 8753E Service Guide for the measurement verification procedure.

Reference Plane and Port Extensions

Use the port extension feature to compensate for the phase shift of an extended measurement
reference plane, due to such additions as cables, adapters, and Bxtures, after completing an
error-correction procedure (or when there is no active correction).
Using port extensions is similar to using electrical delay. However, using port extensions is the
preferred method of compensating for test fixture phase shift. 'Ihble 5-l explains the difference
between port extensions and electrical delay.
Differences between PORT EXTENSIONS and ELECI'IUCAL DELAY
The end of a cable becomes the test port plane Compensates for the electrical length of a
for all S-parameter measurements.
All S-parameters.
Intelligently compensates for 1 times or 2
times the cable's electrical delay, depending
on which S-parameter is computed.
Then enter the delay to the reference plane.
. . . . . . . . . . . . . . . . . . . . . / . . . . . . . . . . :::m
cable.
Set the cable's electrical length x 1 for
transmission.
Set the cable's electrical length x 2 for
reflection.
Only the currently selected Sparameter.
Only compensates for electrical length.
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