Intrinsic Uncertainty and Accuracy of a Medical Electrical Safety Analyzer

A

akmal122g

#1
Hello. Can someone help me with this equipment specification. The equipment is a medical electrical safety analyzer. The brand is Gossen Metrawatt and the model is Seculife ST.

I am trying to find the accuracy of the equipment but I cannot find it in the manual. However, the equipment specifies intrinsic uncertainty in its specification. I enclosed the specification of the equipment. Is intrinsic uncertainty similar to accuracy?
 

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dgriffith

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#2
Re: Intrinsic uncertainty and accuracy

Just love the way language is different around the world--even scientific/technical terms . . .
I'm hazarding a guess that they mean relative accuracy, which does not account for the propagated accuracy/uncertainty of the standards in the traceability chain.
In other words, the accuracy the instrument is capable of if all standards used to calibrate it were perfect.

After re-reading the specifications, if it were me, I would call the MFR. or whoever sold it to you and ask to speak with the sales engineer. Ask them to explain what they actually mean when they say 'uncertainty'. These look more like accuracy specs than uncertainty.
My answer to your question, "is accuracy similar to uncertainty", is that they are related but are not the same. Accuracy reflects the expected closeness of agreement to the true value. Since the true value can never be known, the error in the measurement can also never be known. Uncertainty is an estimate of the range of values within which the true error lies. It can be shown that the uncertainty of the error is also, then, the uncertainty of the measurement. But it is not the accuracy.
 
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