Ac meters-part-1
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This document discusses using a d'Arsonval meter movement to measure alternating current (AC) by adding a diode rectifier. A half-wave rectifier converts the AC waveform into a pulsating DC signal, allowing the meter to respond. However, the sensitivity is reduced to approximately 45% compared to DC measurement due to only measuring the positive half of the AC cycle. Multiplier resistors can be adjusted to restore full-scale deflection at the original voltage range when measuring AC instead of DC.
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Ac meters-part-1
- 1. AC Meters Chapter 03
- 6. Introduction No Meter Movement DC Use AC Use Applications 1 Electro-dynamometer YES YES Standard meter, Wattmeter, etc… 2 Iron-Vane YES YES Indicator applications, etc… 3 Electro-static YES YES High voltage measurement. 4 Thermocouple YES YES Radio freq measurement 5 D’Arsonval YES YES-w/ rectifiers Voltage, currents, resistance, etc…
- 12. d’Arsonval MM with ½ Wave Rectification