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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A constant voltage transformer (CVT) works on ferro-resonant principle. The variation in the primary flux with an unsaturated iron core does not affect the secondary flux with saturated iron core. Thus, the secondary induced voltage remains relatively independent of the voltage impressed upon the primary winding. Fig. 1: Constant Voltage Transformer (CVT).
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Fibre Optic Cable carry light signals instead of the electric signals. They are used for light and infrared transmissions. Fig. 1: Construction of Fibre Optic Cable.
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Hot Wire Anemometer (or Thermal Flow Meter) makes use of temperature coefficient effect i.e. the resistance of conducting material changes with change in temperature. Fig. 1 : Hot wire anemometer.
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In Vapour Pressure Thermometers, a filling substance may be liquid, gas or vapour. Vapour pressure thermometer falls in the category of filled system thermometer. Working and Construction of Vapour Pressure Thermometer Figure 1: Vapour Pressure Thermometer.
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