Chapter 4 4-29
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Troubleshooting 8753ES Option 014
Symptom 2
Degraded or irregular response in the S11 and S12 measurement. No problems in the S22
or S21 response mode. Refer to Figure 4-17.
1. Check the jumper cable between the PORT 1 A IN and the PORT 1 A OUT ports. If the
jumper is damaged, replace it. If no damage can be found on the jumper, take a look at
the SWITCH and COUPLER ports on the front panel. Inspect for damage to the ports.
Look for damage to the center conductor (bent pin) or damaged threads on either port.
Replace any damaged ports.
2. If no problems are found during inspection of the ports, reconnect the jumper between
the PORT 1 A IN and the PORT 1 A OUT port. Make sure that the jumper is connected
correctly. Improper connections will cause power holes in the frequency response.
3. If the problem still persists, check the internal cables located in the RF test deck area.
Refer to Figure 13-6 on page 13-16 for cable locations.
Figure 4-17 Example Symptom Two
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