Refer to page 6 of the specifications document
for gain and offset error information.
We can then plug in these values in the formulae specified in this
document to reach the accuracy values depending upon the device calibration status and test environment.
Using the above table, accuracy of NI 9222 at 0V reading for a calibrated device, operating at maximum temperature range is (ignoring noise uncertainty):Absolute Accuracy =± [(VoltageReading x GainError) + (VoltageRange x OffsetError) + NoiseUncertainty]
[(0 x 0.2/100) + (10.6 x 0.01/100)]
= ± 1.06 mV