Keysight E4990A - Performance Failure Troubleshooting; Adjustment Failure Troubleshooting

40 Impedance Analyzer
1 Troubleshooting
Performance failure Troubleshooting
Table 4 shows the recommended replacement board when the
performance test fails even after adjustment.
(**: most suspicious, *: suspicious)
Adjustment failure Troubleshooting
Table 4 shows the recommended replacement board when the
adjustment fails.
Table 3 Recommended replacement board for performance test 
failure
Failed Adjustment item
A11 Synthesizer A7 LF Source A5 TRD A8 VRD
Signal Frequency Accuracy ** *
Signal Level Monitor Accuracy ** ** * *
Signal Level Accuracy ** *
DC Bias Level Monitor Accuracy ** *
DC Bias Level Accuracy ** *
Z Measurement Accuracy * ** *
Table 4 Recommended replacement board for adjustment failure
Failed Adjustment item
A11 Synthesizer A7 LF Source A5 TRD A8 VRD
10MHz Reference Frequency **
Clock Level ** *
DC Bias Level **
TRD MODEM ADC DC Offset **
TRD MUX DC Offset **