Preliminary Checks - Agilent Technologies E8362A Service Manual

Tests and Adjustments

Preliminary Checks

Preliminary Checks
Preliminary checks include the following:
• "The Operator's Check" on page 3-10
The operator's check tests the network analyzer's basic functionality of the source,
switch, step attenuators, and receivers.
• "The Test Port Cable Checks" on page 3-13
The test port cable checks are not required, but are recommended to verify the
performance of the test port cables before performing the verification test.
The Operator's Check
NOTE To achieve the maximum system stability, allow the analyzer to warm up for
at least 90 minutes before performing the Operator's Check.
The operator's check is a software driven test that checks the basic operation of the
assemblies in the Port 1 and Port 2 paths. By performing the operator's check, the
following is determined:
• operation of the transfer switch (switch repeatability check)
• phase-lock capability across the entire frequency band (switch repeatability check)
• function of the four receivers (switch repeatability check)
• operation of the step attenuators (attenuator range check—Option UNL only)
• receivers' linearity (attenuator range check—Option UNL only)
Switch Repeatability Check
The check performs a reflection measurement of a short and stores the resulting trace in
memory. The transfer switch is toggled to the opposite port and back, and then another
reflection measurement is made. The difference between the stored trace and the return
trace is the switch repeatability. This test also checks the phase lock across the entire
frequency band and operation of all four receivers.
Attenuator Range Check—Option UNL Only
This check performs a reflection measurement of a short and stores the resulting trace in
memory. As the internal attenuator is switched in 10 dB steps over its 60 dB range,
reflection measurements are made and compared with the stored trace. The resulting
measurements must fall within a limit testing window to pass the test. The window size is
based on source and receiver specifications. By performing the Port 1 and Port 2 tests,
rough checks of the linearity for all four receivers (from 0 dB to 60 dB) are verified and
operation of the attenuator is verified.
3-10
PNA Series Microwave Network Analyzers
E8362A, E8363A, E8364A
Service Guide E8364-90001