A multimeter is a handheld device that compound different electronic testing and measurement tools. A basic multimeter measures resistance, voltage, and current. More advanced models can measure capacitance, inductance, and temperature.

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Controls

A multimeter has controls to allow you to select the quality to be measured, such as resistance, current or voltage. The main control will be a dial which you crumple to select what you're testing. Buttons or switches are also possible either as primary or as secondary controls -- for selecting the range of values you're looking at, for example, although many multimeters find the range automatically. There are different circuits for diverse measurements; the controls allow you to select which circuit is in use.

Power Source

The power source for a hand-held multimeter is typically a battery. Mini units may only require a single one and a half volt AA cell, while larger models with more functions may need a nine-volt battery.

Display

Basic digital multimeter typically have a monochrome LCD digital screen capable of displaying numerical figures to two or three decimal places, plus icons to indicate the setting an omega for resistance, for example. Older analog models may have dual displays with a needle indicating the reading. Wordily wise modern models may feature larger screens that allow them to include an oscilloscope function, displaying waveforms graphically as well as numerical data.









PARTS OF MULTITESTER

SCALE

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A scale is a series of marking used for reading the value of the quantity. The scale can have different types of scale, for voltage and current readings the scales have mostly linear which mean the equal division of resistance.

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POINTER– The needle-shape rod that moves over the scale of a meter.

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ZERO-OHM ADJUSTMENT KNOB– is used to zero-in the pointer before measuring resistance

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A multimeter can be useful for basic fault finding and field service work or a bench instrument which can measure to a very high degree of accuracy. They can be used to troubleshoot electrical problems in a wide array of industrial and household devices such as electrical instruments, motor control, domestic appliance, power supplies and wiring system.