The deflecting torque causes the pointer to deflect from zero position and it may attain any position on the scale. But it is desired that the proportional to the quantity attain any position deflection should to be measured. So controlling torque is essential.
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The eddy current tachometer converts the angular speed (ω) of the rotor into pointer deflection ϕ. The diagram of the eddy current type tachometer is shown in figure 1. The eddy current tachometer is also referred as drag-up tachometer.
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Earth Tester generally used for measurement of earth resistance. Figure 1: Earth Tester.
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Synchroscope instrument is used for synchronization process. i.e. Connecting 3 phase alternator for parallel operation. Necessity of Synchroscope In power system, the 3 phase alternators, transformers are connected in parallel with system. When 3 phase alternator are connected to the line or system, the correct instant of connecting it to the system is important. That
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Ohmmeter is used to directly measure resistance of a device, element, circuit or any portion thereof. This meter is used to determine approximate (not too accurate) resistance of the circuit components. It can be used to measure the resistance of heating element of heater, electric iron, field coil resistance, sorting resistors used in electronics circuits. It can also
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