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Class of accuracy in electrical measurements
In electrical engineering class of accuracy is a figure which represents the error tolerance of a measuring device.
== Measurement ==
In electrical engineering characteristics like current or voltage can be measured by devices named ammeter, voltmeter, multimeter, etc. The ammeter is used in series with the load. So the same current flows through the load and the ammeter. The voltmeter is used in parallel with the load. So the voltage between the two terminals of the load is equal to the voltage between the two terminals of the voltmeter. Ideally the measuring device should not affect the circuit parameters i.e., the internal impedance of the ammeter should be zero (no voltage drop over the ammeter) and the internal impedance of the voltmeter should be infinite (no current through the voltmeter). However in actual case, ammeters have a low but non zero impedance and voltmeters have a high but not infinite internal impedance. Thus the measured parameters are somewhat altered during the measurements.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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