4-30 Chapter 4
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Troubleshooting 8753ES Option 014
Symptom 3
Degraded or irregular response in the S22 and S12 measurement. No problems in the S11
or S21 response mode. Refer to Figure 4-18.
1. Check the jumper cable between the PORT 2 SWITCH and the PORT 2 COUPLER
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 2 SWITCH and the PORT 2 COUPLER 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 4-18 Example Symptom Three
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