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Potential Transformers Potential transformers are extremely accurate-ratio stepdown transformers and are used in conjunction with standard low-range voltmeters (100-120 V) whose deflection when divided by transformation ratio, gives the true …
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Current Transformer A current transformer takes the place of shunt in d.c. measurements and enables heavy alternating current to be measured with the help of a standard 5-A range a.c. …
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Ratio and Phase Angle Errors of Instrument Transformers For satisfactory and accurate performance, it is necessary that the ratio of transformation of the instrument transformer should be constant within close …
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Instrument Transformers The d.c. circuits when large currents are to be measured, it is usual to use low-range ammeters with suitable shunts. For measuring high voltages, low-range voltmeters are used …
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AC Potentiometer An AC potentiometer basically works on the same principle as a DC potentiometer. However, there is one very important difference between the two. In DC potentiometer, only the …
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DC Potentiometer DC potentiometer is used for measuring and comparing the e.m.fs. of different cells and for calibrating and standardizing voltmeters, ammeters etc. In its simplest from, it consists of …
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Electrodynamic Power Factor Meter Working Principle of Electrodynamic Power Factor Meter The Electrodynamic Power Factor Meter is based on the dynamometer principle with spring control removed. Figure A Construction of …
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Moving iron Power Factor Meter Construction of Moving iron Power Factor Meter One type of power factor meter suitable for 3-phase balanced circuits is Moving iron Power Factor Meter shown …
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Moving-iron Frequency Meter Working Principle of Moving-iron Frequency Meter: The action of Moving-iron Frequency Meter depends on the variation in current drawn by two parallel circuits – one inductive and …
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Electrodynamic Frequency Meter Electrodynamic Frequency Meter is also referred to as moving-coil frequency meter and is a ratiometer type of instrument. Working Principle of Electrodynamic Frequency Meter: The working principle …
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