Absolute Accuracy

[eromon]

Hi Team,

My name is Alfred Amiolemen, I am working on measurement uncertainties. I used NI USB 6003 to acquire my data and the absolute accuracy is given to be 6 mV across the full voltage range of +- 10V, and 0.4 mVrms noise. 

I want to know if this absolute accuracy includes quantisation, noise, off-set and any other uncertainty elements. In other words, am I to treat the absolute accuracy differently than quantisation, noise and offset in the analysis of type B uncertainty due to the DAQ usage?

I will appreciate your kind and prompt response.

Kind Regards

Alfred A

[softball]

Hi

Accuracy and Precision are the result of observations on a black box.

These terms has been used for centuries.

And you don't need to know what is inside the black box.

As for the newer term 'Absolute Accuracy' NI has given an example in the manual for the higher performance device PXIe-6363 :

No references to bit resolution for any involved ADC or DAC.

As for the USB-600x these are low cost units that can only be re-calibrated by an NI outfit.

NI published this article 'What Is Absolute Accuracy at Full Scale for DAQ Devices' :

https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z000001DdrdSAC&l=da-DK

Surveying and related disciplines also use the term 'Relative Accuracy', related to but not the same as Precision. But that is quite exotic.

Regards