Use the DAQmx 42xx Calibration VIs to calibrate NI 42xx devices.

DAQmx Adjust 4204 Calibration VI
Adjusts the internal and external calibration constants for an NI 4204 device. You must connect a known voltage to the device and specify that voltage with reference voltage.
DAQmx Adjust 4220 Calibration VI
Adjusts the internal and external calibration constants for an NI 4220 device. This device requires reference signals of 0.0 volts at gains of 1, 15, 20, and 310 on a particular channel in order to perform an offset calibration for that channel. If you do not manually supply those reference signals, the device measures them internally with sample and hold circuitry enabled.
DAQmx Adjust 4224 Calibration VI
Adjusts the internal and external calibration constants for an NI 4224 device. You must connect a known voltage to the device and specify that voltage with reference voltage.
DAQmx Adjust SC Baseboard Calibration VI
Adjusts the external calibration constants for the baseboard of an SC Series device. You must connect a known voltage to the device and specify that voltage with reference voltage.

Parent topic: DAQmx Calibration

NI-DAQmx VI and Function Reference