Multimeter - Revision history

Jmdonev: 1 revision imported

2018-05-11T18:17:04Z

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Jmdonev at 17:52, 9 May 2018

2018-05-09T17:52:22Z

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	[[File:Digital_Multimeter_Aka.jpg\|400px‎\|thumb\|right\|Figure 1: A digital multimeter with two electrical leads to measure [[voltage]], [[current]], or [[resistance]].<ref>Wikimedia Commons. (September 23, 2015). ''Multimeter'' [Online]. Available: https://upload.wikimedia.org/wikipedia/commons/a/a6/Digital_Multimeter_Aka.jpg‎</ref>]]		[[File:Digital_Multimeter_Aka.jpg\|400px‎\|thumb\|right\|Figure 1: A digital multimeter with two electrical leads to measure [[voltage]], [[electric current]], or [[resistance]].<ref>Wikimedia Commons. (September 23, 2015). ''Multimeter'' [Online]. Available: https://upload.wikimedia.org/wikipedia/commons/a/a6/Digital_Multimeter_Aka.jpg‎</ref>]]

	<onlyinclude>A '''multimeter''' is a device which measures [[current]], [[resistance]], and [[voltage]] (provided it's attached to an ~~electrical~~ [[circuit]] properly). It comes in analog and digital forms, but both function the same basic way.</onlyinclude><ref name=A>R.T. Paynter, “Basic Electric Components and Meters,” in ''Introduction to Electricity'', 1rst ed. NJ: Prentice-Hall, 2011, ch. 3, sec. 3.7, pp. 107-116.</ref> A multimeter possesses the capability of a [[#Voltmeter\|voltmeter]], [[#Ammeter\|ammeter]], and [[#Ohmmeter\|ohmmeter]]. To see how a multimeter can switch between these readings please see [http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/movcoil.html#c1 hyperphysics].		<onlyinclude>A '''multimeter''' is a device which measures [[electric current]], [[resistance]], and [[voltage]] (provided it's attached to an [[electric circuit]] properly). It comes in analog and digital forms, but both function the same basic way.</onlyinclude><ref name=A>R.T. Paynter, “Basic Electric Components and Meters,” in ''Introduction to Electricity'', 1rst ed. NJ: Prentice-Hall, 2011, ch. 3, sec. 3.7, pp. 107-116.</ref> A multimeter possesses the capability of a [[#Voltmeter\|voltmeter]], [[#Ammeter\|ammeter]], and [[#Ohmmeter\|ohmmeter]]. To see how a multimeter can switch between these readings please see [http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/movcoil.html#c1 hyperphysics].

	===Voltmeter===		===Voltmeter===
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J.williams: 1 revision imported

2015-11-13T01:47:20Z

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Jmdonev at 20:02, 24 September 2015

2015-09-24T20:02:59Z

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	[[File:~~Multimeter_off_small~~.jpg ‎\|thumb\|right\|Figure 1: A digital multimeter with two electrical leads to measure [[voltage]], [[current]], or [[resistance]].<ref>~~http~~://~~courses~~.~~ncssm~~.~~edu~~/~~apb90~~/~~labs~~/~~L11~~/~~using_multimeter.htm accessed 2014-11-24~~.‎</ref>]]		[[File:Digital_Multimeter_Aka.jpg\|400px‎\|thumb\|right\|Figure 1: A digital multimeter with two electrical leads to measure [[voltage]], [[current]], or [[resistance]].<ref>Wikimedia Commons. (September 23, 2015). ''Multimeter'' [Online]. Available: https://upload.wikimedia.org/wikipedia/commons/a/a6/Digital_Multimeter_Aka.jpg‎</ref>]]

	<onlyinclude>A '''multimeter''' is a device which measures [[current]], [[resistance]], and [[voltage]] (provided it's attached to an electrical [[circuit]] properly). It comes in analog and digital forms, but both function the same basic way.</onlyinclude><ref name=A>R.T. Paynter, “Basic Electric Components and Meters,” in ''Introduction to Electricity'', 1rst ed. NJ: Prentice-Hall, 2011, ch. 3, sec. 3.7, pp. 107-116.</ref> A multimeter possesses the capability of a [[#Voltmeter\|voltmeter]], [[#Ammeter\|ammeter]], and [[#Ohmmeter\|ohmmeter]]. To see how a multimeter can switch between these readings please see [http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/movcoil.html#c1 hyperphysics].		<onlyinclude>A '''multimeter''' is a device which measures [[current]], [[resistance]], and [[voltage]] (provided it's attached to an electrical [[circuit]] properly). It comes in analog and digital forms, but both function the same basic way.</onlyinclude><ref name=A>R.T. Paynter, “Basic Electric Components and Meters,” in ''Introduction to Electricity'', 1rst ed. NJ: Prentice-Hall, 2011, ch. 3, sec. 3.7, pp. 107-116.</ref> A multimeter possesses the capability of a [[#Voltmeter\|voltmeter]], [[#Ammeter\|ammeter]], and [[#Ohmmeter\|ohmmeter]]. To see how a multimeter can switch between these readings please see [http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/movcoil.html#c1 hyperphysics].
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J.williams: 1 revision imported

2015-08-26T21:31:23Z

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J.williams at 16:57, 12 August 2015

2015-08-12T16:57:02Z

New page

[[Category:Done 2015-02-15]] [[Category: check images]]
[[File:Multimeter_off_small.jpg ‎|thumb|right|Figure 1: A digital multimeter with two electrical leads to measure [[voltage]], [[current]], or [[resistance]].<ref>http://courses.ncssm.edu/apb90/labs/L11/using_multimeter.htm accessed 2014-11-24.‎</ref>]]

<onlyinclude>A '''multimeter''' is a device which measures [[current]], [[resistance]], and [[voltage]] (provided it's attached to an electrical [[circuit]] properly). It comes in analog and digital forms, but both function the same basic way.</onlyinclude><ref name=A>R.T. Paynter, “Basic Electric Components and Meters,” in ''Introduction to Electricity'', 1rst ed. NJ: Prentice-Hall, 2011, ch. 3, sec. 3.7, pp. 107-116.</ref> A multimeter possesses the capability of a [[#Voltmeter|voltmeter]], [[#Ammeter|ammeter]], and [[#Ohmmeter|ohmmeter]]. To see how a multimeter can switch between these readings please see [http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/movcoil.html#c1 hyperphysics].

===Voltmeter===
The voltmeter is connected across a component; in other words, two voltmeter leads are connected to two sides of the component, so a voltmeter is in [[parallel circuit|parallel]] with the component. When a voltmeter is connected across a component it completes the circuit. A small amount of current is generated in the circuit, which then causes a voltage drop across each of the other resistors. This leads to a voltage reading by the voltmeter that is slightly lower than the source voltage.<ref name=B>R.T. Paynter, “Basic Electric Components and Meters,” in ''Introduction to Electricity'', 1rst ed. NJ: Prentice-Hall, 2011, ch. 3, sec. 3.8, pp. 117-121.</ref><ref name=C>R.T. Paynter, “Basic Electric Components and Meters,” in ''Introduction to Electricity'', 1rst ed. NJ: Prentice-Hall, 2011, ch. 5, sec. 5.4, pp. 201-208.</ref> To learn more please see [http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/movcoil.html#c2 hyperphysics].

===Ammeter===
In order to use an ammeter, the current path must be broken and the ammeter is inserted across the break<ref name=B /> (this means that ammeters must be in [[series circuit|series]] with what is to be measured). If an ammeter is put in [[parallel circuit|parallel]] with a circuit (instead of putting it in [[series circuit|series]]), the current will almost certainly blow the [[fuse]]! It's much easier to blow a fuse with an ammeter than with a voltmeter because ammeters have very low [[resistance]].

Clamp-on meters can be used to measure [[Alternating current| AC]] without breaking the conduction path. As an AC passes through the conductor, a magnetic field is formed around it; by measuring the magnetic field strength around the conductor, the current value can be obtained.<ref name=B /> To learn more please see [http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/movcoil.html#c3 hyperphysics].

===Ohmmeter===
The safest way to connect the ohmmeter is to remove the component from the circuit and then connect it across the component like with the voltmeter. It is important to hold only one of the component leads because the resistance of human skin can affect the measurement.<ref name=B /> To learn more please see [http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/movcoil.html#c4 hyperphysics].

For a tutorial on how to use a multimeter please see [http://courses.ncssm.edu/apb90/labs/L11/using_multimeter.htm NCSSM] (the North Carolina School of Science and Mathematics).

==References==
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