GE
D
IRECTION 5535208-100, REV. 2 LOGIQ E9 SERVICE MANUAL
6 - 8 Section 6-3 - DC Offset Calibration
Section 6-3
DC Offset Calibration
6-3-1 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.
6-3-2 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
6-3-2-1 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.
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