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User’s and Service Guide U3047-90002
U3047AE04
Service Information
RF Performance Fails
If the U3047AE04 operates correctly, but RF performance fails the
T
he following procedures can be used to isolate the failed
component. Suspect the coax switches (5087-7317), RF cables, or coupler (5087-7225).
The RF performance of the U3047AE04 depends on the performance of
the PNA. Ensure the PNA is meeting specification before continuing.
1.
Verify that the test set and PNA 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.
Operational Check Failure” on page 48
3.
Review the
“Cal Kit Operational Check” on page 43
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. Refer to
“RF Switch Path Testing” on page 59
5. Directivity trace fails (above −10dB), replace the couplers (5087-7225).
6. Source or load match fails (above −10 dB), replace the coax switch (5087-7317).
7. Isolation is poor between ports, inspect the RF connections. If it continues to fail replace the
coax switch (5087-7317). The RF cables require proper torque (10 in-lb) and can be
damaged by over tightening.
Control Lines are not Working
If the U3047AE04 operates correctly and the rear panel control lines are not functioning, the
following procedures can be used to verify the component failure. Suspect the DUT Control
board (E5091-66503).
1.
Verify that the control voltage pins on the DUT control are connected correctly. Refer to
2.
Verify that the control pot is centered (5V). Refer to
3. Verify the ribbon cable connection.
4. Replace the DUT control board (E5091-66503).
5. Replace the test set control board (N5261-60006).
Содержание U3047AE04
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