
8712ET/ES and 8714ET/ES Troubleshooting and Block Diagrams
RF Network Analyzers Category 3 Failures: Inaccurate (but reasonably functional) Measurements
Service Guide 4-33
Category 3 Failures: Inaccurate (but reasonably
functional) Measurements
Troubleshooting Inaccurate Data
Mechanical Problems
Check adapters, cables, and test port connectors for damage. Gauge the test port
connectors. Ensure that the cables between the source (A4) and receiver (A5) assemblies
are properly connected.
Receiver Detector Problems
Perform the following receiver adjustments in the order below, which are described in
Chapter 2, “Adjustments.” If the problem is in both narrowband and broadband modes,
combine the tests and follow the order in Chapter 2, “Adjustments.”
Problems with Trace or Data Drift
If data seems to drift, it may be caused by very poor uncorrected directivity. Drift can also
be caused by poor cables connected to the DUT.
1. First, move the cables connected to the DUT. If the drift on the display follows cable
movements, change test cables. If the test cables are working properly, go to the next
sections, “Troubleshooting Trace Drift for ET Models” or “Troubleshooting Trace Drift
for ES Models.”
Narrowband Mode Problems:
Switched Gain Correction Adjustment #102
B Amplitude Correction Adjustment #105
Reflection (One-Port) Correction Adjustment #107
Broadband Mode Problems:
Switched Gain Correction Adjustment #102
External Detector Gain Correction Adjustment #103
B* Amplitude Correction Adjustment #110
R* Amplitude Correction Adjustment #108
R* Frequency Response Correction Adjustment #109
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