Analog Instruments Pdf
Classification of Analog Instruments
The examples of this class of instruments are ammeters, voltmeters, wattmeters and energy meters. Electronic Instrumentation. Ammeters, Voltmeters, Wattmeters.
The measurand current passes through the heating elements increases their temperature. Ordinary voltmeters, ammeters and wattmeters belong to this category.
The following are the classifications of the instrument by the methods. If a strip of conducting material carries current in the presence of a transverse magnetic field as shown in the below figure, an emf is produced between two edges of the conductor. Amarnath Reddy I am a graduate in electrical engineering and blogger by passion. Hall effect elements are extensively used in magnetic measurements.
This effect is utilised in permanent magnet moving coil instruments. Recording instruments give a continuous record of the quantity being measured over a specified period. This force is used to move one of the plates. Electronic instruments are constructed by addition of electronic circuits to electromagnetic indicators in order to increase the sensitivity and input impedance. Your email address will not be published.
The force produced by the interaction of induced currents and the alternating magnetic fields makes the disc move. Therefore, if we pivot the soft iron on a spindle between two bearings and a coil is mounted near it, the iron piece will swing into the coil when the latter is carrying current. These instruments convert the energy of the measurand directly into energy that actuates the instrument and the value of the unknown quantity is measured or displayed or recorded directly.
The analogue instruments can also be classified by showing the output of measured quantity. The classification of the analogue instruments can also be done by the methods used by the instruments for comparing the measured quantity. The analogue instruments can be categorised according to the principle of operation. Electrical measuring instruments may also be classified according to the kind of current that can be measured by them.
Direct measuring instruments are the most commonly used in engineering practice because they are the most simple and inexpensive. The instruments which work on this principle is known as the electrostatic devices. If we form the conductor into a coil, internal hint run converter to create pdf file the magnetic field produced by each turn of the coil will add up and the coil will behave as an imaginary magnet as shown in the below figure. The induction effect is mainly utilised in a. If you have any doubts you can mail us palakalaamarnath gmail.
They usually indicate the values in the whole numbers, though one can get the readings up to one or two decimal places also. The integrating instruments are of two types. Nowadays, the digital instruments are becoming very popular, which indicate the values directly in numerical form and even in decimals thus making them easy to read and more accurate. Most of the analogue instrument use pointer or dial for indicating the magnitude of the measured quantity.
For example, an instrument meant for measurement of current is classified as an Ammeter while an instrument that measures voltage is classified as a Voltmeter. It produces an imaginary bar magnet. Most of the measuring instruments indicate the value of parameter in the form of the indicator movement, which gives us the magnitude of that quantity.
The ammeter and voltmeter belong to this category. Comparison type instruments are used in cases where a higher accuracy of measurement is required.
What are Measuring Instruments Analogue and Digital Measuring Instruments
This effect is mostly used in the induction effects. The voltage is produced between the two edges of conductors. Also, their use makes the measurement possible in the shortest time.
The thermocouple attached to the element converts the temperature into an emf. The areas of application which are common to both analog and digital instruments are fairly limited at present. The resultant field is as shown in below figure c. This current can be measured and is indicative of the r.
Analog Instruments Classification of Analog Instruments. The analogue instrument is classified by the type of current that can be measured. When a piece of soft iron which has not been previously magnetised is brought near the end of the coil, it will be attracted by the coil. On the whole, the advantages of the digital instruments outdo the disadvantages, which is why they have become highly popular. There are also digital instruments for measurement of the blood pressure, heart beat rate, and others.
They can also be used for sensing of current. Force produced due to a current carrying a magnetic field. The following are the types of an electrical instrument.
The various effects used are listed in the table present in the middle of this article. The physicals quantity like voltage, current, power and energy are measured through the analogue instruments.
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