Troubleshooting 1
Impedance Analyzer 39
Performance Test failure Troubleshooting
This section describes the adjustment and troubleshooting
procedures used when the E4990A 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.
Table 2 Recommended adjustment for performance test failure
Failed Performance test item Recommended Adjustment
Signal Frequency Accuracy 10MHz Reference Frequency
Signal Level Monitor Accuracy TRD Phase Track
Signal Level
Signal Level Accuracy TRD Phase Track
Signal Level
DC Bias Level Monitor Accuracy DC Bias Level
DC Bias Level Accuracy DC Bias Level
Z Measurement Accuracy TRD MODEM ADC DC Offset
TRD MUX DC Offset
VRD Mixer LO Leakage
TRD Phase Track
TRD MODEM DAC DC Offset
Signal Level
VRD ADC Linearity
TRD Compression
Z Measurement Correction
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