Main Voltage And Current Calibration Principle; Understanding The Problem - Ametek Sorensen XG Operation Manual

Main Voltage and Current Calibration Principle

Understanding the Problem

Figure 7-1 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. Calibrating one
will affect the other so an iterative calibraton procedure is used.
For best results, iterative calibration of gain and offset will be required.
After first calibration of both, repeat gain calibration for 90% of
maximum value and offset calibration for 10% of maximum value.
Repeat as neccesay.
Figure 7-1 Offset (Intercept) Error and Gain (Slope) Error
M370430-01 Rev B
Gain Error
Offset Error
Programmed Value
Calibration and Troubleshooting
7
7-3