User Manual
2253i / 2253iX
AMETEK
California Instruments
97
6.4 Non-Routine Output Calibration
The output calibration will not affect the accuracy of the output voltage when the ALC mode is either
ON or in REG mode. In these modes of operation, the output voltage accuracy is determined by the
voltage measurement accuracy.
The calibration shown in this paragraph will be influenced by the gain of the power amplifier for each
phase. The setting of the output calibration coefficients will affect the initial settling time of the ALC
mode after power on.
The amplifier gain is set at the factory and the output calibration coefficients are pre-set. There is no
need to change the factory default settings unless any of the following conditions occurs:
1. Replacement of the CPU controller board. (CI P/N 6005-703-1)
If the output gains are found to be out of tolerance, they need to be adjusted. This requires removal of
the top cover and should only be done by qualified service personnel. In that case, refer to the non-
routine calibration section.
The factory output calibration coefficients are shown in the table below.
Output Phase
Output Cal Coefficient
A
2800
B
2800
C
2800
Table 6-2: Output Calibration Coefficients - Factory Defaults.
