Rockwell Automation T3420AF ICS Regent Analog Input Modules - Manual (Page 30)

Analog Input Modules (T3420A, AF)
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Industrial Control Services
Calibration Preparation
The module must be calibrated while connected to an I/O
chassis of an operational Regent system.
During calibration, the analog input module will be
disconnected from the actual field devices. Appropriate
precautions should be taken to ensure that the disconnection
of the field sensors does not pose a safety risk to plant
personnel or process equipment.
There are Offset, Gain and CMR (Common Mode Rejection)
potentiometers that are common to all of the analog input
channels. These potentiometers are located on the front of the
analog input PCB (see Figure 19). During the calibration
procedure the Offset and Gain potentiometers will be adjusted.
The CMR potentiometer is factory adjusted and does not
require adjustment in the field.
Important!