Ammeter 'classes' what do they mean?

retched

Joined Dec 5, 2009
5,207
six different accuracy classes (from 0.5 to 4.0) and considering accidental failures only, one may state that also in terms of accidental failures does the correlation between the accuracy and the reliability of the tested instruments exist with a high likelihood (over 0.9999): instruments of higher accuracy classes are less reliable than less accurate and less sensitive instruments.
From:
Measurement Techniques

Article:
Relation between the accuracy and the reliability of certain thermo-energy type of instruments

http://en.wikipedia.org/wiki/Current_transformer#Accuracy
 
Last edited:

Thread Starter

Grayham

Joined May 18, 2010
79
I see so the class is actually accuracy in percentage.
Class 1.5 = 1.5% error margin.
Class 2.5 = 2.5% error margin.

So lower class is better.

Right?
 

retched

Joined Dec 5, 2009
5,207
Correct. They run hand in hand. Also, the lower the class, the more reliable and sensitive.

So better overall.

But, more expensive for the lower, especially .2 class.
 
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