U3047AM08
Service Information
5.
Control Lines are not working.
a.
Verify that the control voltage pin connections to the DUT control
lines are connected properly. Refer to
b.
Verify that the rear panel DC voltage control adjustment can be set
to 5 Vdc. Refer to
RF Performance Failures
If the U3047AM08 operates correctly, but RF performance fails the operational
test. The following procedures can be used to isolate the failed component.
Suspect the coax switches (N1811-60019), RF cables, or coupler (5087-7754).
1.
Verify that the test set and network analyzer SOURCE, RCVR, CPLR THRU,
and CPLR ARM connectors are clean and that the center pins are not
damaged.
2.
Verify the interface and internal RF cables are cleaned and not damaged.
“Verifying Cal Kit Operational Check Failure” on page
3.
Review the
“Cal Kit Operational Check” on page
and verify the results
for the port that is failing.
4.
Reflection tracking trace shows a power hole, or is below the test limit line,
perform the switch path test for the port that is failing.
5.
Directivity trace fails (above −10dB), replace the couplers (5087-7754).
6.
Source or load match fails (above −10 dB), replace the coax switch
(N1811-60019).
7.
Isolation is poor between ports, inspect the RF connections. If it continues
to fail, replace the coax switch (N1811-60019). The RF cables require
proper torque (10 in-lb) and can be damaged by over tightening.
The RF performance of the U3047AM08 depends on the performance
of the network analyzer. Ensure the network analyzer is meeting
specification before continuing.
Keysight U3047AM08 User's and Service Guide
73
