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ELECTRICAL MEASURING INSTRUMENTS PDF

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Emphasising simple methods and instruments, materials aspects, electrochemistry, Be able to perform simple electrical measurements of voltage , current, and. Electrical Measurements and Measuring Instruments[1].pdf - Ebook download as PDF File .pdf), Text File .txt) or read book online. Instrumentation book. Basic Electrical Measurements. Electromechanical measuring devices. There are several advantages of traditional electromechanical instruments: simplicity.

The classification of the electric instruments depends on the methods of representing the output reading. In this article, we discuss the different types of electrical instrument. Absolute Instrument The absolute instrument gives the value of measures quantities regarding the physical constant.

ELECTRICAL MEASUREMENTS AND MEASURING INSTRUMENTS - EMMI Study Materials

The physical constant means the angle of deflection, degree and meter constant. The mathematical calculation requires for knowing the value of a physical constant. The tangent galvanometer is the examples of the absolute instruments. In tangent galvanometer, the magnitude of current passes through the coil determines by the tangent of the angle of deflection of their coil, the horizontal component of the earth magnetic field, radius and the number of turns of wire used.

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The most common applications of this type of instrument are found in laboratories. Secondary Instrument In the secondary instrument, the deflection shows the magnitude of the measurable quantities. The output of this type of device is directly obtained, and no mathematical calculation requires for knowing their value.

Digital Instrument The digital instrument gives the output in the numeric form.

The instrument is more accurate as compared to the analogue instrument because no human error occurs in the reading. Analog instrument The instrument whose output varies continuously is known as the analogue instrument. The analogue instrument has the pointer which shows the magnitude of the measurable quantities. The analogue device classifies into two types. Null Type Instrument In this instrument, the zero or null deflection indicates the magnitude of the measured quantity.

The instrument has high accuracy and sensitivity. In null deflection instrument, the one known and one unknown quantity use. When the value of the known and the unknown measuring quantities are equal, the pointer shows the zero or null deflection.

The null deflection instrument is used in the potentiometer and in galvanometer for obtaining the null point. Deflection Type Instrument The instrument in which the value of measuring quantity is determined through the deflection of the pointer is known as the deflection type instrument.

The measuring quantity deflects the pointer of the moving system of the instrument which is fixed on the calibrated scale. Thus, the magnitude of the measured quantity is known.

For example a cathode ray.

CRO is capable to follow dynamic and transient changes of the. Electrical Measuring Instruments. Electrical Measuring Instruments Other classification of instruments: These instruments do not require comparison.

They are mostly used as means of standard measurements and are maintained lay national laboratories and similar institutions.

These instruments are calibrated by comparison with an. Therefore secondary instruments are most commonly. The quantity to be measured by these instruments can be determined from the deflection of the instruments.

Some of the instruments are also named based on the above effect such as electrostatic voltmeter, induction instruments, etc. Examples are ammeter, voltmeter, wattmeter etc.

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In principle, these are indicating instruments but so arranged that a permanent continuous record of the indication is made on a chart or dial. The recording is generally made by a pen on a graph paper which is rotated on a dice or drum at a uniform speed. The amount of the quantity at any time instant may be read from the traced chart. Any variation in the quantity with time is recorded by these instruments. Any electrical quantity like current, voltage, power etc.

That is, these instruments totalize events over a specified period of time. No indication of the rate or variation or the amount at a particular instant are available from them. Some widely used integrating instruments are: Ampere- hour meter: kilowatthour k. Wh meter, kilovolt- ampere- hour k.Records are stored in the internal memory for the period of the last 3 years. The result of the comparison obtained regarding numerical value.

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Examples are dc and ac bridges and potentiometers. Open the catalog to page 5.

Electrical Engineering Measuring Instruments. The output of this type of device is directly obtained, and no mathematical calculation requires for knowing their value.

Published by Iskra MIS, d. Deflection Type Instrument The instrument in which the value of measuring quantity is determined through the deflection of the pointer is known as the deflection type instrument.

But the literature that is needed is not a collation of catalogues, but something that may guide the purchaser in selecting an instrument suited to his purpose. The recording is generally made by a pen on a graph paper which is rotated on a dice or drum at a uniform speed.

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