User’s and Service Guide U3047-90001
69
U3047AM12
Service Information
Connect the RF Flex cables to the Source IN and CPLR ARM port indicated in
, the expected results
should be similar to
RF Performance Failures
If the U3047AM12 operates correctly, but RF performance fails the operational test.
T
he following
procedures can be used to isolate the failed component. Suspect the coax switches (N1811-60019), RF
cables, or coupler (5087-7754).
NOTE
The RF performance of the U3047AM12 depends on the performance of the network
analyzer. Ensure the network analyzer is meeting specification before continuing.
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
.
3. Review the
“Cal Kit Operational Check” on page 46
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.
Table 20
Receiver Bypass Signal Path Test Instructions
Path #
Test Port Group
RF Path Description
Control Mode
<Address>.<Data>
Path
Components
1
Port 5, 9, 13
RCVR OUT to CPLR ARM
0.0
S13
2
Port 6, 10, 14
RCVR OUT to CPLR ARM
16.0
S23
3
Port 7, 11, 15
RCVR OUT to CPLR ARM
32.0
S33
4
Port 8, 12, 16
RCVR OUT to CPLR ARM
64.0
S43
Summary of Contents for U3047AM12
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