How do I use a multimeter to check for power?


since your screen name is" old salt ", and your asking how to check a shore power cord rated at 50 amps, I'm sure you are concerned about a ship to shore electrical hookup?

Be advised, that with a good multi-meter, you will be able to check the integrity of the power cable's inner conductors between themselves.

HOWEVER, this does not provide a complete safety check, since any one of those conductors might/could be exposed to the outside environment ( ie- the ground, or other physical devices, including a person walking along, who happens to contact the cable at just the wrong time) and this WILL NOT show up when you do a continuity check on the conductors.

should your power cable happen to have cracked insulation, that is difficult to see with the naked eye, and say it's laying in a walkway area, that could be covered in water during a rain storm, what you check now with a meter will not show this fault.

There is a piece of equipment that will show cable...

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The load will draw power, Amperes, and depending of the type of cell this can be quite a lot.

A good RCR123 LiIon cell can push out up to 18-19 Amperes!

An 18650 LiIon cell even more!

And this will make the load produce heat, as well as if you make the cell pump out too much, the cell can go


So doing these measurements, drawing a lot of Amperes from the cell, you try to minimize the time the leads are connected/the load is applied.

Try to connect a second most, your DMM should be able to get a reading by that time.

If your DMM has a "Hold" function, use that and do the readout after you have disconnected the battery!

Any loss of charge is no problem, these are rechargeable cells we are talking...

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This is the pressure in an electrical circuit


This is a measure of the current flowing in an electrical circuit


A measure of the resistance to flow in a circuit

Voltage Source

This produces a current flow in a circuit. It could be a battery, portable generator, mains supply to a home, alternator on your car or bench power supply in a lab or workshop


A device or component which draws power from a voltage source. This could be an electronic resistor, bulb, electric heater, motor or any electrical appliance


This is usually the point in a circuit to which the negative terminal of a battery or power supply is connected


Direct current. Current flows only one way from a DC source, an example of which is a battery


Alternating Current. Current flows one way from a source, reverses, and then flows the other way. This happens many times a second at a rate...

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NEVER use the Ohms or continuity setting of any multimeter on a live circuit. Only on things that are disconnected, like a fuse or electrical device that is taken out/disconnected. The meter has a battery inside to supply power for that function. (Just because the key is off doesn't mean no power to a fuse. Many are "live" while the car is off, like for the lights and such.)

You want to use the DC (not AC) volt setting of your meter, with the range set to (preferably) 20 volts, or if no such range exists, autorange. Connect the black lead to a ground. Use the red lead to probe the terminals of the fuses. If both sides read about 12 to 13 volts, the fuse is good. If one side reads about 12 to 13 volts, and the other side 0, the fuse is blown. If both sides read 0, that fuse is only fed power with the ignition on, and you need to turn the key to the "run" position and check again. Car engine not running, but key in the position as if it was. If all fuses read 0 on both sides, the...

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Multimeters are devices which allow measurement of electrical current, voltage, and resistance.

A multimeter is exactly what it sounds like… a bunch of meters bundled into a single instrument. It’s like buying a multipack of chips or soda from Costco. You only have to get one item and you get everything… least that’s the idea. Most multimeters come equipped with a core set of basic features outlined in the next section, Basic Features. More advanced multimeters come with additional instrumentation options which are outlined under the Advanced Features section. Multimeters come in many different shapes, sizes, and forms with varying levels of sophistication so just be aware that the multimeters that you encounter may operate differently but the core measurement instrumentation is approximately all the same. The multimeter that we will be using is a Fluke 115 so each section will also outline how to perform each measurement on that model. Every multimeter comes with a...

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jfjunior- ca: I wish the camera was doing a closeup of the multimeter and not the environment around it, that way we could see the settings being selected, etc.

RisenT: This video is mostly about applicability and not how the instrument works.. :(

mattyx3x: How did you not smoke check that meter?

DZEyoyo123: Is it okay to have continuity between neutral and ground?

Erik Reppen: Thanks guy who was wrong about Node.js. This was helpful. : )

wyomingamy: Can you demonstrate how to use the multimeter to check a cordless drill charger? I suspect my charger is the problem NOT the battery. I have the Radio Shack pocket multimeter. Thanks.

DrearierSpider1: Use Adblock Plus

catbirdfeeder: I bought the same one, but no instructions came with it!!! thanks for this

Tyler Stanford: NICE TV

Biz of Tech: @robertlynnfoster That's why you have to use Battery mode, it puts a lode on the battery. (I mentioned this in the video)


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How to use a multimeter

Photo 1: How to test batteries

Test battery life using a multimeter or volt-ohm meter (VOM). Analog-type multimeters use a needle and printed scales to display results from a variety of electrical tests.
Function setting: Direct current (DC) voltage
Scale setting: 12 volts
Test probes: Match the polarity (“+” to “+” and “-” to “-”) of the test probes and the battery.
Good reading: 6 volts (this battery’s original rating)
Bad reading: Batteries with voltage readings 20 percent below their original rating should be replaced.

A multimeter is a black box of electronic circuitry that allows you to troubleshoot just about any type of electrical wiring or device. You simply dial the proper function and scale, touch the two test leads to the wiring or device in question and check the meter reading. Depending on the setting, the multimeter will tell if you have a broken connection, no power, poor connections, faulty...

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A properly executed PSU test using a multimeter should confirm that the power supply is in good working order or if should be replaced.

Note: These instructions apply to a standard ATX power supply. Almost all modern consumer power supplies are ATX power supplies.

Time Required: Testing a power supply manually using a multimeter will take 30 minutes to 1 hour to complete

Confirm that the power supply voltage switch located on the power supply is properly set for your country.

Note: In the US, the voltage should be set to 110V/115V. Check the Foreign Electricity Guide for voltage settings in other countries.

Plug the PSU into a live outlet and flip the switch on the back of the power supply. Assuming that the power supply is at least minimally functional and that you've properly shorted the pins in Step 5, you should hear the fan begin to run.

Important: Just because the fan is running does not mean that your power supply is supplying power...

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Electrostatic Discharge (ESD) is probably something you have experienced many times. It occurs when an electrical charge on one non-conductive surface discharges onto a conductive surface. For example, if you shuffle your feet across a carpet, particularly one that contains man-made fibers, a static electrical charge builds up in your body. As soon as you touch something that conducts electricity, such as a metal handle, the electrical charge in your body discharges rapidly to the metal object. You feel an electric shock, which is harmless. However if ESD occurs between sensitive electrical components, such as computers, it can cause serious damage. Since ESD occurs mainly between people and other objects, if you work on sensitive electrical equipment you need to wear a special wristband connected to ground so that static electricity doesn't build up.

Use a multimeter to check for ESD.

Use static electricity built up in your own body: it's a great way to check ESD...

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