Keysight E4990A Troubleshooting Manual page 42

Impedance Analyzer
Table 4 Recommended replacement board for adjustment failure
VRD Mixer LO Leakage
TRD Phase Track
TRD MODEM DAC DC Offset
Signal Level
VRD ADC Linearity
TRD Compression
Z Measurement Correction
DC-DC Converter Switching
Frequency
(**: most suspicious, *: suspicious)
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