Omega Engineering OMB-CHARTSCAN 1400 User Manual page 31

Calibration
Calibration must be completed periodically to ensure equipment is accurate, and
can be performed manually, or with the use of ScanCal. Chapter 6 contains
instructions, including calibration equipment requirements, for the following:
ChartScan main unit calibration for offset and gain
Offset calibration for all card types
Gain calibration for low volts cards
Gain calibration for high volts cards
Cold junction calibration for TC cards
Note: ChartScan main unit constants are stored in NV-RAM.
Signal Conditioning Card constants stored in each card's EEPROM.
Note: Industry standard calibration period is once every year.
General Information ChartScan User's Manual 2-7