Test Instruments & Measuring DevicesVOLTMETERSThe accuracy of a voltmeter (Kv) is defined as the ratio of measured voltage when the meter isin the circuit (Vw) to the voltage measured with the meter out of the circuit. Equation (14-2) isa mathematical representation of the accuracy of a voltmeter, or true voltage (Vo).(14-2)KvVwVoMeter accuracy can also be determined by comparing the relationship between the input andcircuit resistances using Ohm’s Law as described below.KvVwVoVwImRinImRinVoImVoRoRinVoRinRoRinVoKvRinRoRinwhereIm= meter currentVo= true voltageRo= circuit resistanceRin= input resistance of the voltmeterKw= indicated voltageKv= meter accuracyRev. 0 Page 7 ES-14
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