Electrical Engineering ⇒ Topic : Range extension of hot-wire voltmeter

Range extension. The range of a hot-wire voltmeter can be extended by using a high resistance (multiplier) in series with the hot-wire. The ammeter range can be extended by using a shunt. However, for use at radio frequency, special precautions must be observed in the design of the instrument and the shunt; in particular inductance must be avoided as far as possible