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Digital meters are rated into categories based on their intended application, as set forth by IEC 61010 -1 and echoed by country and regional standards groups such as the CEN EN61010 standard.
Category I is used where equipment is not directly connected to the mains.
Category II is used on single phase mains final sub-circuits
Category III is used on permanently installed loads such as distribution panels, motors, and 3 phase appliance outlets.
Category IV is used on locations where fault current levels can be very high, such as supply service entrances, main panels, supply meters and primary over-voltage protection equipment.
Minimal value of the signal that can be measured with guaranteed accuracy.
As a rule in AC measuring process we are interested in the value equivalent to DC which action would cause the same thermal effect as the action of AC under measurement. This value is called current root-mean-square value (or RMS).
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