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Only attempt any electrical measurement or other similar job if you understand the risks involved with the equipment you are working with, are competent to do the work safely and have the appropriate tools and equipment for it.

First select the appropriate type of voltage (AC or DC) and the voltage range on the meter. The range should initially be set to a value higher than the voltage to be measured could possibly be. For example, to measure a voltage in the range 220 to 250 V AC, the meter range could be set to 300 V AC.

However, many modern digital meters are 'auto-ranging' - on these it is only necessary to ensure that the meter is a voltmeter. Or, if it is a multimeter (i.e. is also capable of making other types of measurements such as current or resistance) then ensure that it is set to measure voltage.

Next ensure that the meter leads and probes are in a safe condition and suitable for measuring the expected range of voltage. If the voltage to be measured could be more than 50 V then probes with short tips (2 mm or less) and finger-guards should be used. Voltages greater than 600 V should only be worked on by people competent to work safely on the specific voltages involved, and in possession of the equipment suitable for those voltages.

Then carefully apply the tips of the probes to the two points between which the voltage is to be measured. Ensure that each probe tip makes contact with only one point in the circuit. Do not touch live terminals. When only one probe tip is in contact with the circuit, do not touch the other probe tip or allow it to make contact anywhere except where required for the measurement(s).

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