Use of MultimeterUse of Multimeter

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Outlook of MultimeterOutlook of MultimeterPointer and Scale

– single pointer with different scale for different measurements

Selection Switch– select to measure

voltage (ac or dc), current or resistance.

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Reading from Reading from MultimeterMultimeter

As the Selection Switch is at DC25mA, the multimeter is used as a ammeter with fsd 25mA.

The 250A scale is used.

Reading = 17.5mA

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Using as an OhmmeterUsing as an Ohmmeter

With the input terminals shorted, set zero by turning the 0 Adjust Knob.

Remember to set zero again if the ohmmeter range is changed.

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Reading from Reading from MultimeterMultimeter

As the Selection Switch is at x10, the reading has to be multiplied by 10.

The reading is 90, so the resistance is 900 .

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Measuring AC VoltageMeasuring AC Voltage

If AC voltage is measured, remember to use the “output “ terminal instead of the “positive” terminal.

The “negative” terminal is still used.

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Digital MultimeterDigital Multimeter Same as analogue multimeter but it

has the advantage of having a large internal resistance.

If the reading is larger than the range, the reading cannot be shown.

The “COM” terminal is always used. The other terminal can be “10A”, “AmA”, “V” depending on the measurement.

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Digital OhmmeterDigital Ohmmeter

In the figure shown, the resistance of the resistor is 0.824k.

There is no need to multiplied 2k for digital ohmmeter as it is the range, but not the conversion factor.

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Measuring AC/DCMeasuring AC/DC

Make sure that the switch is switched to the correct side for DC or AC measurement.

DC AC

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