Measurement Computing USB-1602HS-2AO - Manual (Page 37)

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Chapter 4
Calibrating the USB-1602HS-2AO
Every range of a USB-1602HS-2AO device is calibrated at the factory using a NIST traceable calibration
process. Correction factors for each range are stored on the unit at the time of calibration.
The analog input calibration can be adjusted in the field without destroying the factory calibration. This is
accomplished by having two independent calibration tables in the on-board EPROM: one table contains the
original factory calibration, and the other table is used to store field calibration constants.
You can perform field calibration automatically in seconds with InstaCal and without the use of external
hardware or instruments. Field calibration traceability is derived through an on-board reference which has a
stability of 0.005% per year. A two-year calibration period is recommended for the USB-1602HS-2AO.
Calibrate the USB-1602HS-2AO using InstaCal after the board has fully warmed up. The recommended warm-
up time is 15 minutes. For best results, calibrate the board immediately before making critical measurements.
The high resolution analog components on the board are somewhat sensitive to temperature. Pre-measurement
calibration ensures your board is operating at peak accuracy.