FUTEK IPM500 (D500) Digital Display - Manual (Page 47)

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21. METER CALIBRATION
All analog input and analog output ranges of the meter have been digitally calibrated at the
factory prior to shipment using calibration equipment certified to NIST standards. Calibration
constants are stored digitally in non-volatile memory in EEPROM on the signal conditioner
board and analog output board. As a result, these boards may be mixed and interchanged
without requiring meter recalibration. Digital calibration eliminates much of circuitry that would
be associated with analog calibration, providing superior long term accuracy and stability.
If recalibration is required, the meter may be returned to the factory .