What is Effective Measuring Range? (Insulation Testers, Megohmmeters)

QWhat does it mean when an insulation resistance tester's effective measuring range is divided into 1st effective measuring range and 2nd effective measuring range?


The range of measurement in which accuracy is guaranteed is called the effective measuring range, which is distinguished between the first and second effective measuring ranges.
Hioki's insulation testers conform to IEC61557-1 and IEC61557-2.
The standard includes a section entitled "Range for which operating uncertainty is guaranteed", and the "1st effective measuring range" corresponds to this range for which operating uncertainty is guaranteed. 

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