range extension of ammeter and voltmeter pdf

Range Extension Of Ammeter And Voltmeter Pdf

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Published: 17.04.2021

There is no fundamental difference in the operating principles of ammeters and voltmeters. Both are current operated devices except electrostatic type voltmeters i.

Definition: The ammeter shunt is the device which provides the low resistance path to the flow of current. In some of the ammeter , the shunt is inbuilt inside the instrument while in others it is externally connected to the circuit. The ammeter designs for measuring the low current.

Ammeter and voltmeter | Extension of the range of ammeter and voltmeter

In many cases, the use of ammeters and electrical multitesters involves connecting in series with current circuits to read the current. In other cases, the ammeters' shunt resistors will be connected in series for the same current reading purpose. Either way, the current must pass through a shunt or meter. To measure small currents, ammeters with Westin type of movements are used. Do you know your hidden name meaning?

Though there are convenient basic movements for measuring the current in the ranges, there will be situations where current ranges far greater than the standard ranges will be required for measurement of current. In such cases specially made ammeters will not be used. One of the available basic ammeter will be taken and it will be provided with the 'shunt resistance'. Thus any basic ammeter's range can be extended to the, required full scale deflection. Let its range be extended by 'N' times making the new full scale deflection after extension to be equal to I A.

An ammeter from ampere meter is a measuring instrument used to measure the current in a circuit. Electric currents are measured in amperes A , hence the name. The ammeter is usually connected in series with the circuit in which the current is to be measured. An ammeter usually has low resistance so that it does not cause a significant voltage drop in the circuit being measured. Instruments used to measure smaller currents, in the milliampere or microampere range, are designated as milliammeters or microammeters. Early ammeters were laboratory instruments that relied on the Earth's magnetic field for operation. By the late 19th century, improved instruments were designed which could be mounted in any position and allowed accurate measurements in electric power systems.

Extension of Range of Ammeter

A voltmeter is an instrument used for measuring electric potential difference between two points in an electric circuit. It is connected in parallel. It usually has a high resistance so that it takes negligible current from the circuit. Analog voltmeters move a pointer across a scale in proportion to the voltage measured; digital voltmeters give a numerical display of voltage by use of an analog-to-digital converter. Voltmeters are made in a wide range of styles.

DC Ammeters

AC electromechanical meter movements come in two basic arrangements: those based on DC movement designs, and those engineered specifically for AC use. Figure below. Permanent-magnet meter movements, like permanent-magnet motors, are devices whose motion depends on the polarity of the applied voltage or, you can think of it in terms of the direction of the current.

Extension of Range of Ammeter


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