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MultimetersMultimeters are very useful test instruments. By operating a multi-position switch on the meter they can be quickly and easily set to be a voltmeter, an ammeter or an ohmmeter. They have several settings (called 'ranges') for each type of meter and the choice of AC or DC. Some multimeters have additional features such as transistor testing and ranges for measuring capacitance and frequency. Digital multimeters All digital meters contain a battery to power the display so they use virtually no power from the circuit under test. This means that on their DC voltage ranges they have a very high resistance (usually called input impedance) of 1Mohm or more, usually 10Mohm, and they are very unlikely to affect the circuit under test. Digital meters have a special diode test setting because their resistance ranges cannot be used to test diodes and other semiconductors. Analogue multimeters Analogue meters take a little power from the circuit under test to operate their pointer. They must have a high sensitivity of at least 20kohm/V or they may upset the circuit under test and give an incorrect reading. See the section below on sensitivity for more details. Batteries inside the meter provide power for the resistance ranges, they will last several years but you should avoid leaving the meter set to a resistance range in case the leads touch accidentally and run the battery flat. It is a good idea to leave an analogue multimeter set to a DC voltage range such as 10V when not in use. It is less likely to be damaged by careless use on this range, and there is a good chance that it will be the range you need to use next anyway!
For more information about multimeters see the following sites.
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