Troubleshooting 1
Impedance Analyzer 33
Performance Test failure Troubleshooting
This section describes the adjustment and troubleshooting
procedures used when the Keysight E4991B fails the performance
tests. If the performance of the instrument is critical for the test
limits and seems adjustable, perform first the adjustment(s)
related to the failed test. When the test result are far from the
tolerance of the test or the performance is not adjustable, isolate
the faulty assembly in accordance with the “Performance Test
failure Troubleshooting procedure.
Recommended Adjustment for Performance Test failure
Table 2 shows the recommended adjustments when the
performance test fails. Select the adjustment program
corresponding to the recommended adjustment and perform the
adjustment.
Performance failure Troubleshooting
Table 3 shows the recommended replacement board when the
performance test fails even after adjustment.
Table 2 Recommended adjustment for performance test failure
Failed Performance test item Recommended Adjusment
Frequency Accuracy Frequency Reference
Level Accuracy Synthesizer Gain
Source Output Power
DC Bias Accuracy DC Bias Level
Z Measurement Accuracy Receiver IF Range
Default Cal Coefficient
Table 3 Recommended replacement board for performance test failure
Failed Performance test item
A21 Source
A6 Receiver
A9 DC Bias
A55 10MHz OCXO
Test Head
Frequency Accuracy ** *
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