HP HP 8753E, Service Manual, Page: 248 / 612

Step 2. Operator’s Check
Description
The operator’s check consists of two initiated tests: Port 1 Op and
Port 2 Op
A short is connected to port 1 (port 2) to reflect the source energy back into
the analyzer for an measurement.
The part of Port Op checks the repeatability of the transfer switch.
An measurement is stored in memory and the switch is toggled to port 2 and
then back to port 1 where another measurement is made. The difference
between the memory trace and the second trace is switch repeatability.
The remaining parts of both tests exercise the internal attenuator in 5 steps
over a 55 range.
The resulting measurements must fall within a limit testing window to pass the
test. The window size is based on both source and receiver specifications.
The operator’s check determines that:
n
The source is phase locked across the entire frequency range.
n
All three samplers are functioning properly.
n
The transfer switch is operational.
n
The attenuator steps 5 at a time.
Required Equipment and lbols
Short . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . part of the HP calibration kit
warm-up time:
30 minutes.
Procedure
1. Disconnect all devices, peripherals, and accessories (including adapters and
limiters) from the analyzer.
3. The display should show TEST 21 Port 1 Op in the active entry area.
4 4 Start Troubleshooting Here