I am using an NI Strain/Bridge Input module. How can I calculate the theoretical accuracy values of my system. What is the minimum increment value from this device?
By convention all values are calculated in mV/V. The reason for this is explained in this Knowledge Base article.It is important to note that the above calculation will give you the worst case absolute accuracy of the measurement before performing shunt and offset calibration. It is recommended that shunt and offset calibration are performed before taking measurements with the NI-9237. After performing shunt and offset calibration the new absolute accuracy equation can be given as the following:T = Worst case temperature change from when shunt and offset calibration were performedAccuracy = (Gain Drift * T) + (Offset Drift * T) + Noise + (Half Bridge Drift * T) + (Quarter Bridge Drift * T)The accuracy after shunt and offset calibration is primarily dominated by the error due to temperature changes.
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