Download Define on Multimeter www.AssignmentPoint.com The multimeter is a

Define on Multimeter
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The multimeter is a common piece of equipment in all electrical toolkits. They are used by Installers,
Electricians and engineers. They use the multimeter to measure AC or DC voltage or current, and
resistance or decibel loss between two nodes in a circuit.
The basic multimeter can be analog with a dial or digital with an LCD display. A multimeter is used to
make electrical measurements of AC and DC voltage, AC and DC current, and resistance.
In electrical theory an ideal multimeter has no effect on the circuit being measured. An ideal voltmeter
would have infinite resistance, so no current could flow through it while it is attached to a circuit. An
ideal ammeter would present no resistance to a circuit. Real multimeters do not achieve this ideal, so their
readings will very closely match theoretical, calculated values for a circuit, but never with absolute
precision.
It is called a multimeter because they measure voltage, current and resistance. Some can also test diodes.
A multimeter is not to be confused with a megger which is somewhat riskier to use.
The typical multimeter has a range setting and many digital models have auto ranging. Many have a dial
to switch between the various ranges and AC/DC.
Digital multimeters are generally battery operated although there are test bench designs that work off a
power supply.
An advanced multimeter can also measure temperature, inductance, capacitance, Frequency and duty
cycle.
Its a good idea when purchasing a multimeter to buy one with more than the basic features. A diode
checker can be very useful for example. Another important factor is the accuracy of the device and the
functional operating range. Does it have an auto range feature.
Some technicians feel that the older analog models have their advantages over the digital multimeters but
generally the digital meters are more popular.
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