Multirange Ohmmeter

Multirange Ohmmeter: The Multirange Ohmmeter circuit shown in Fig. 4.28 (a) is only for a single range of resistance measurement. To measure resistance over a wide range of values, we need to extend the ohmmeter ranges. This type of ohmmeter is called a multirange ohmmeter, shown in Fig. 4.29.   Shunt Type Ohmmeter The shunt […]

Series Type Ohmmeter

Series Type Ohmmeter: Series Type Ohmmeter – A D’ Arsonval movement is connected in series with a resistance R1 and a battery which is connected to a pair of terminals A and B, across which the unknown resistance is connected. This forms the basic type of series ohmmeter, as shown in Fig. 4.28 (a). The […]

Considerations in Choosing an Analog Voltmeter

Considerations in Choosing an Analog Voltmeter: In Considerations in Choosing an Analog Voltmeter the following factors are to be considered. Input Impedance The input impedance or resistance of the voltmeter should be as high as possible. It should always be higher than the impedance of the circuit under measurement to avoid the loading effect, discussed […]

True RMS Voltmeter

True RMS Voltmeter: True RMS Voltmeter – Complex waveform are most accurately measured with an rms voltmeter. This instrument produces a meter indication by sensing waveform heating power, which is proportional to the square of the rms value of the voltage. This heating power can be measured by amplifying and feeding it to a thermocouple, […]

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