How to Use a Multimeter

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A multimeter is used for measuring different types of voltage, amps and resistance. Use a multimeter with tips from a certified HVAC tech and plumber in this free video on electrical repairs.

Part of the Video Series: Electrical & Plumbing Repairs
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Video Transcript

Hi, I'm James with JNC Home Repair. Today I'm going to demonstrate on how to operate a multimeter. O.k., what we have here is a multimeter. It's used for measuring different types of voltage. It's also used for measuring amps and it's also used for measuring resistance or ohms. O.k., basically you need to know the different signs in case you have a wiring diagram of whatever you're trying to measure the voltage of or the amps or the resistance. You can see that the sign for ohms is actually the omega sign. It looks like a upside down horseshoe. O.k., all those different settings right there are all used for measuring resistance, diodes, transistors, small circuit type stuff. That's usually what, you know switches, solenoids, any stuff like that, that's what you want to use. You want to use your ohms settings depending on what the capacity of whatever you're measuring. O.k., the next thing on the multimeter is direct currents. O.k., you can see you've got two hundred millivolts, you've got two volts, two twenty volts, two hundred volts, and six hundred volts. O.k., these are all direct currents. O.k., you want to use these settings for measuring voltage. Like if you're measuring voltage in your house like maybe a twenty four volt circuit or twelve volt circuit, basically anything that has a positive and a negative. O.k., you don't want to try to use this circuit on anything like electrical plug or electrical switch or anything like that. It's just not going to work, o.k. You want to use direct currents for just basically positive and negative application, something that has a positive, something that has a ground, o.k. That's what the little symbol for is, the little solid line and the little dotted line, o.k. The next setting on this meter is measuring an AC current which is an alternating current, which is common in homes. That's what you're going to find in your plugs, in your switches. Any voltage around the house is going to be an alternating current, and AC, o.k. Most of your household stuff is a hundred and ten volts, o.k., a hundred and twenty volts, so you want to keep your setting on at two hundred volts so you can actually read what you're doing up here on the screen. And if you're measuring something like for an AC like a two twenty current, you want to bump your setting up to six hundred volts, o.k. This particular meter here also measures amps, o.k. So what you will want to do, this meter is only capable of measuring up to ten amps, you would also have to switch your leads here. This lead would actually have to go over here to the amps, to be able to measure for amps, o.k. Most applications for this type of meter are usually done with, you know most people are measuring voltage or resistance, you know, most of the time. But this particular meter is capable of measuring amps. It also will measure a double A battery. This one has a setting for a one point five volt battery, which is common for any double A, triple A, C or D battery, and it'll also test a nine volt battery, o.k. It's a pretty handy little tool, and if you have any more questions about this you can reach me at


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