How to Use a Multimeter for Beginners - How to Measure Voltage, Resistance, Continuity and Amps

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How's it going do it yourselfers, today we are going back to the basics and I am going

to show you how to properly use a multimeter.\par And we will be covering how to measure DC

Voltage\par AC Voltage\par

Resistance and Continuety \par and also how to measure Amps\par

Plus I'll show you how you can calculate watts and amps for any device at the end of this

video.\par lets start with DC Voltage, Basically the

main source for DC Voltage in devices we use each day are batteries so pretty much all

devices that use a battery run on DC Voltage, \par

For example any any device on your car that runs off the car battery, your wireless drill

or any camera that runs on batteries uses DC Voltage.\par

and DC Voltage stands for Direct Current and when using the multimeter to measure for DC

Voltage you need to set it here where you see V for voltage with these straight and

dotted lines .\par Next you need to make sure your test leads

are in the right location, \par Your black ground or common test lead will

always need to be here where it says COM.\par But your red test lead is the one that you'll

need to switch around based on what you are measuring. \par

And for measuring Voltage you need to place your red test lead here where you see the

sign for Voltage. \par Next you need to place your Red test lead

on the positive or powered side of the device or circuit you are measuring and the black

test lead on the ground side. \par And as far as where to exactly set the dial

on your multimeter, you want to set the dial to the number just above the maximum amount

of voltage you are measuring. \par So for this 1.5v AA battery we can set it

to 2 volts. \par and as you can see we have _______ volts which

means this is a fully charged battery. \par But if you are unsure about how much voltage

you are supposed to measure you can always start higher and come lower to get a more

precise measurement.\par And here we are going to measure the voltage

on this 12 volt car battery, as you can see we have ______ volts but we are also seeing

a negative sign, basically that just means we have our test leads on the circuit backwards,\par

this doesnt hurt the multimeter but is a good way to find out your positive and ground side

when you are unsure which one is which.\par \par

Next up AC Voltage, \par basically any device that plugs into your

wall socket runs on AC Voltage, \par AC Voltage stands for, Alternating current

\par and when measuing AC Voltage your red lead

stays in this slot, but you need to set your dial here where you have the Voltage sign

but also this wave sign.\par So if we want to see if we have current at

a wall socket for examble, we set our multimeter to 200 in the AC Voltage area, and thats because

here in the US we get about 110 volts at the socket.\par

Now a word of caution when measuring high voltage like this you need to be a hundred

percent sure of the integraty of your multimeter and the test leads, plus when you take your

measurement make sure you keep your fingers far from the tip of the test leads and that

the leads dont come close to each other at when you are taking the measurements. For

added safety you can always ware glvoes too. \par

so next we put in our test leads, first the ground which goes here where the bigger hole

is \par and than our red test lead which goes into

the smaller hole. \par and as you can see we have ____ which is good

because I was gona stick a nail in there....\par I actually did that as a 4 year old.. dont

ask why I was 4... I remember flying after I got zapped though. \par

btw this lower bottom one is the wall unit ground point, and a good way to see if it

is grounded is to put your ground test lead on here and measure voltage as well. \par

\par Next up resistance, \par

basically Resistance is the opposition that any substance has to the flow of electric

current.\par so for example this piece of wood is extremely

resistant to the flow of electric current, \par

where as these wires have next to no resistance to the flow of electric current. \par

\par Now different components of an electronic

circuit or system are supposed to have a certain amount of resistance so that the whole circuit

works properly and thats where knowing how to exactly measure resistance is crucial.\par

when measuing resistance you need to set your dial to this setting where you can see this

sign which is for resistance,\par and your red test lead stays in the same location

because as you can see we have the sign for resistance here as well. \par

and we will be testing the resistance of this spark plug wire for this example which is

supposed to have about ____ to _____ Ohms of resistance. And Ohms is the unit of measurement

for resistance.\par so we get our multimeter and set it to the

next number up which is ______ ohms and the K here simply represents a thousand.\par

and as you can see we have ______ ohms which means this spark plug wire is within spec.\par

\par now lets go onto the continuity test, continuity

basically means checking an electric circuit to see if current current can flow through

it by sending a very small amount of voltage through it, and on a multimeter continuity

is usually verified by a sound of a beep. \par

and in order to test for continuity we set are multimeter here where we see this sign,

which also is part of the resistance settings so our test leads stay in the same locations.\par

and for this example I will use my buffer which has recently developed an intermittent

problem, when its turned on as it moves in different directions it stops and starts on

its own, making me suspect a wire that is partially damaged and only works in certain

angles.\par so I will first unplug this as you never want

to check a HOT Circuit for resistance or continuity. \par

than I will remove the cover and attack my test leads to the power pin and the corresponding

wire/pin inside once I hear the beep from our multimeter telling me we have continuity

I will am going to start to wiggle the cable in different locations to find my damaged

wiring, ahh there it is found the problem.\par and if I dont find it on the power side I'll

switch to the ground and repeat the test. \par

this is a especially a useful test to check the continuity on small circuit boards like

this as well. \par \par

Next up measuing amps\par now when you need to measure amps on this

multimeter your need to switch your red test leads to one of these slots\par

first this one that can only measure upto 200 mA or in otherwords .200 Amps \par

or this one that measure upto 20 A. \par Now on this multimeter this first one is fused

which means if you are in this setting and end up measuring more than 200 mA a fuse inside

will blow saving your multimeter, but this second one is unfused which means your multimeter

will blow if you measure more than 20 amps.\par so you need to be careful when measuring a

circuit with higher amps. or buy a multimeter that is fused on this side as well. \par

\par No when measuring amps you basically need

to place your multimeter inside of the circuit on the power side, \par

so for example in this basic circuit, you make a break here on the power side, \par

grab the red test lead and place it close to the power sorce, \par

and the black test lead on the other side completing the circuit, and than letting your

multimeter measure the current flowing through it.\par

and as you can see this small light bulb uses _______ amps of current. \par

\par And that's all there is to it, if you found

this video useful please give it a thumbs up, subscribe if you want to see more like

it and also consider checking out some of my other video's I'll put them up on the screen

as video links so you can just click on them. \par

Alright thanks for watching, see you next time.\par

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