Voltmeter for use by e.g. electrician, has resistive or capacitive load connected in parallel with classical voltmeter circuit so that direct or alternating voltage source to be measured assures certain flow during measurement

摘要

The voltmeter has a resistive or capacitive load connected in parallel with a classical voltmeter circuit in order that a direct or alternating voltage source to be measured assures a certain flow during the measurement. The load is separated by switching in order to be discharged. A switching system with a set of wafers on same axis permits to effectuate two comparative tests on same voltage by utilizing load or without load.