Accuracy Precision of Electrical Measuring Instruments |
Posted: December 29, 2017 |
Electrical measuring instruments are the equipment that is used to test voltage, power, read temperature of the surface etc. The measurement can be classified in number of ways. Here are some of the ways:
Absolute Measuring InstrumentsWhen the instrument gives output in physical constant then it is called absolute measurement. SECONDARY MEASURING INSTRUMENTS When the instrument is constructed with the help of absolute measurement instruments it is known as secondary measuring instruments. These are scaled with the help of absolute instrument comparison. They measure quantity of an item, As working with absolute instruments is time consuming. Another way of classifying the electrical measuring instruments depends on the way they produce the result of measurements. On this basis they can be of two types: Deflection Type Instruments As the name suggests pointer used in this electrical measuring instruments deflects to scale the quantity. The value of the quantity can be measured by measuring the net deflection of the pointer from its initial position. Null Type Instruments Null or zero type electrical measuring instruments work on the principle that is opposite to deflection type instruments. The pointer remains stationary as it produces opposing effect. Value of opposite effect should be known in order to calculate the value of unknown quantity. Null point type instruments are more sensitive than the Deflection type instruments. Functions of electrical instruments: Indicating Function Recording Function Controlling Function
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