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MultimetersSearch by section D.E.V.I.C.E. servicesQuoted accuracy is specified as the minimum DC voltage or lower ‘mV’ DC range accuracy.
The resolution of a multimeter is the smallest part of the scale which can be shown. It’s often specified in the number of decimal digits resolved and displayed.
First figure of range in advertisement and catalogues usually means less significant digit on minimal range.
A multimeter is a combined instrument for measuring several parameters in electrical circuits and changing electrical and electronic components.
The continuity test mode in the multimeter is designed to determine low resistance in the electrical circuit being tested and has a sound (ringing, beeping) at a resistance of less than 10 Ohms.
The diode testing mode in a multimeter is designed to determine the voltage drop across a semiconductor junction. This mode is indicated by a diode icon on the multimeter panel.
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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