Xantrex XTR 850 Watt, Operating Manual

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Calibration and Troubleshooting
M370046-01 B-3
6
Main Voltage and Current Calibration Principle
Understanding the Problem
Figure B-1 illustrates two sources of analog programming error: gain
error and offset error. Gain error is the departure from the ideal slope of
the measured versus programmed line. Offset error is the magnitude of
the measured value when the programmed value is zero.
For best results, the next recommended action is gain calibration for 90%
of maximum value and offset calibration for 10% of maximum value.
Perform gain calibration again.
Figure B-1 Offset (Intercept) Error and Gain (Slope) Error
Programmed Value
Idea
l
Re
al
Offset Error
Gain Error