Electrical Instruments

AC bridges

AC bridges (alternating current bridges) are derived from the DC Wheatstone bridge. It is mostly used for the measurement of unknown electrical quantities (inductance, capacitance, etc.). What are ac bridges? The alternating current bridges (AC bridges) are the electrical circuits that are treated for the measurement of various unknown electrical quantities such as inductance, capacitance, …

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Dynamometer type wattmeter

Dynamometer type wattmeter or electrodynamometer type wattmeter works for both DC as well as AC power measurements. This makes it suitable for using it in many places. The electrodynamometer instrument is generally used as an ammeter and voltmeter. And one of the advantages of the electrodynamometer wattmeter has over the induction wattmeter, is as the …

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Induction type instruments

Induction-type instruments are widely used as energy meters. Principle of induction type instruments This type of instrument works on the principle of electromagnetic induction. When the conducting material is placed in an alternating magnetic field, it induces eddy current in the material. The interaction between the magnetic field and eddy current produces defecting torque on …

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Induction type wattmeter

Wattmeter are of two types electrodynamo type wattmeter and induction type wattmeter. Induction type wattmeter works on the principle of mutual induction. It can only be used for the measurement of ac power, whereas the electrodynamometer type can be used for both ac and dc. Induction wattmeter is useful with circuits having constant supply and …

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Classification of measuring instruments

If you can’t measure, you can’t analyze. Measurement is very beneficial for understanding the outcome. Any device or instrument that measures an unknown quantity is known as a measuring device. Classification of measuring instruments Measuring instruments are classified into the following categories: Primary and Secondary instruments Electrical, Electronic, and Mechanical instruments Analog and Digital instruments …

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Drysdale Polar potentiometer

A Polar potentiometer is a kind of AC potentiometer. There is another type of AC potentiometer that is a coordinate potentiometer. An AC potentiometer compares both the magnitude and phase of an unknown voltage with a known voltage. What is a polar potentiometer? A polar potentiometer measures the unknown voltage in the polar form. ‘Polar …

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Thermocouple type instrument

Thermocouple instrument

In this article, we discuss a thermocouple instrument. Like hotwire instrument, a thermocouple instrument is also a type of electrothermal instrument. What is a thermocouple instrument? When two-conductor of different elements are joined together, a voltage is generated at the joining point (known as junction) which is proportional to the temperature. That junction is called …

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