4-22
HP 85106D mm-Wave System
Service and Troubleshooting
Check Unratioed Power Levels
If One, Two, or Three
Channels Fail the
Unratioed Power Test
If the power level on at least one, but not all, of the four channels fail, the
most likely cause of failure is the HP 85104A mm-wave test set module or
HP 85105A mm-wave controller.
To help isolate the problem to the faulty instrument, use the service adapter
and service tools. These emulate the operation of the source and test set and
check unratioed power levels into the HP 85102 IF/detector.
NOTE
When checking any unratioed power levels, turn averaging on the HP 8510C
OFF.
Run “The Service Program” procedure (Figure 4-8) using the Test Set HP-IB
Commands tests. These tests can find about 15% of all HP 85105A
mm-wave controller failures. The test requires approximately one minute to
complete. Only the digital functionality of the HP 85105 is checked by this
test, not the RF paths.
NOTE
Do not perform Test Number 5 “Increment Active Attenuator” in the “Test
Set HP-IB Commands” menu. The HP 85105A has no attenuators.
Содержание 85106D
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