Dc Offset Calibration - GE LOGIQ E9 Service Manual

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5535208-100, R

DC Offset Calibration

Introduction

The DC offset calibration is performed to calibrate each ADC channel of the GRX inputs. The system

calibrates the ADC to zero output when there is no signal on the input. These bias voltages are stored

in the Back End Processor.

When to do a DC Offset Calibration

Do DC Offset Calibration:

when installing a new LOGIQ E9

after software has been updated or replaced

when DRX board(s) or a MRX board has been interchanged

when a DRX board(s) or a MRX board has been replaced

when the Back End Processor has been replaced

DC Calibration Procedure

1.) Disconnect all connected probes.

2.) Power on the LOGIQ E9.

3.) On the Touch Panel, select Utility -> Service to access CSD.

4.) Log in as GE Service, enter current password

5.) Select Diagnostics tab.

6.) Select Service -> Diagnostics.

7.) Select the "+" before Service Diagnostics folder to open the list of choices.

8.) Select the "+" before Analog Receive to open the test choices for the analog receiver.

9.) Select DC Offset Calibration and then follow the on-screen instructions.

Section 6-3 - DC Offset Calibration