26                                                                                             Keysight E4980A/E4980AL Precision LCR Meter 
Adjustment
Required Adjustment after Replacing Assembly
3-
Required Adjustment after Replacing Assembly
After replacing the following assembly, the adjustment items described in 
Table 3-1 are required. The adjustment must be performed by Keysight’s 
qualified service personnel. If you need the adjustment for your E4980A/ 
E4980AL, it should be sent to the nearest Keysight Technologies service office.
Writing ID
This item writes the serial number, option information into the A1 board of the 
E4980A/ E4980AL.
Write Null Phase Track Default Data
The purpose of this procedure is to write the null phase track default data into 
A2 board
Null DC Offset Adjustment
The purpose of this procedure is to adjust the null DC offset of the A2 board.
Null ADC DC Offset Adjustment
The purpose of this procedure is to adjust the null ADC DC offset of the A2 
board.
ADC Linearity Adjustment
The purpose of this procedure is to adjust ADC non-linearity of the A2 board.
Table 3-1  Required Adjustment Item after Replacing Assembly
Replaced 
Assembly
Adjustment Item
Writing ID
Write Null phase track default data
Null DC offset Adjustment 
Null ADC DC offset Adjustment 
ADC lineality Adjustment 
DC Bias Adjustment 
DC Level V monitor Adjustment 
DC Level I monitor Adjustment 
DC Source Adjustment 
DCR Adjustment 
Impedance Adjustment
AC Level monitor Adjustment
OSC Level Adjustment
PPMC PCA
A1 Board 
A2 Board 
A3 Board