How to Calculate Accuracy of Resistance Measurement with SMU Board

Updated May 12, 2019

Reported In

Hardware

  • PXIe-4137
  • PXIe-4139

Software

  • LabVIEW 2018

Driver

  • NI-DCPower 19.0

Issue Details

I need to do a local sense resistance measurement with a SMU board like PXIe-4139 or PXIe-4137. I need to calculate the accuracy of the measurement.

How can I do it?

Solution


Accuracy is related to Coefficient of variation (CV). It is measure of dispersion of a probability distribution or frequency distribution.
It is often expressed as a percentage, and is defined as the ratio of the standard deviation \ \sigma to the mean \ \mu
 

 
It is very easy to calculate using the Standard Deviation and Variance.vi after the record of different samples, as it is possible to see from the snippet below
 

 

Additional Information

According to ISO 5725-1 Accuracy consists of trueness (proximity of measurement results to the true value) and precision (repeatability or reproducibility of the measurement).


File:Accuracy (trueness and precision).svg