Keysight E4990A - Page 42

Troubleshooting 1
Impedance Analyzer 41
(**: most suspicious, *: suspicious)
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
**
Table 4 Recommended replacement board for adjustment failure