Multimeter / test light / Amp clamp DC Automotive electrical

Multimeter / test light / Amp clamp DC Automotive electrical


my first demonstration it’s going to be a simple test leg this is a simple circuit this one uses an LED most tests let’s use a label however I’ll be just using this LED one for demonstration so you can just simply connect one end to the ground probe to positive and your light will light up and I’ll let you know if you have power present I won’t tell you how much power or how much resistance or anything that’s in that circuit but you’ll know that the power is present but I know this is a 12 volt test leg so I’m going to use that on the 12 volt sir so that’s just one per cost you’re gonna want to take I think see you later I’m tracing to see if I can find a hot wire in a circuit so I’m program wire when I hit the hot wire I’m gonna come to my light bulb in a light I’m gonna know my circuits complete a circuit is a circle pretty much your it wants the bolt this wants to flow your parent wants to flow and a continuous circle so here we have our circuits complete our bolt was lit up I took it up I no longer have a complete circuit so I just leave the circle and iris alone if I want to find the good ground time broken around I know human notice is connected to this wood it’s not a good conductor but then I come to the ground and I found a good ground and the circuit is complete so the Tesla is real simple circuit but it is very handy to have and they’ll be very useful you’ll turn to this a lot not over it is more as we proceed in this job at Evo and this DVL digital volt meter is capable of doing ohms resistance continuity DC volts AC volts AC and DC is the only downside of using this to check my answers I’ve got to open the circuit or finally open in a circuit like removing a fuse sticking your probe because your current has to flow through the meter in order to check the ends where my other type of clamp I’m an animator you can just wrap it around the conductor and it’ll tell you your ends we’re in the end and this one is only capable of 10 amps max and it’s protected with a fuse and that leads us to some tests say I’m going to check DC volts this head of the scale from 400 million volts up to a thousand volts goes before 42 400 to the thousand volts I know that’s above 4 I know it’s under 40 so I’ll set it to 40 if you don’t know you’re you’re both is just said it’s a high scale you’re not over a thousand volts which shouldn’t be see that for terminal terminals down on this trip you’re black comment come on where you’re always going to connect your black bleep we’ll go ahead and plug that in we want to check voltage we want to see what our pressure differences in this power supply so you’ll see this one has to be four bolts the Horseshoe looking symbol for homes and a diode symbol so you know we’re going to want to put our a red road there this other section is for a milliamps and ants not to protect the circuit that has an internal fuse whatever Technic gold is you want to make you have your propolis okay we have this set of 40 so let’s do a simple both this check to see what this power supply put now so you put your red probe here positive black t r- as you can see I’m putting out approximately twelve point nine one nine two right around nine to one average now what if I take a night reverse these two wires so if I reverse it it changes its clarity if you look over this left side here you’ll see a minus sign come up and as I have my polarity backwards so once you put the positive my positive negative i- i know the polarity is correct and this power supply and this battery is perfect and that’s a simple all this chap isn’t a DVI I’m not going to check the ants right now I’m going to show you that once we build a circuit because I have nothing right here to put a load on like a light bulb or something I have to have the boot in order to check the amps but let’s go over it see what a continuity continuity has that sound we’ve simple the article signal and you’ll see it come up here in the lower left hand side of my screen continuity is the continuous flow so if you’re checking a wire or just say a circuit let’s think of a circuit as a circle so every thing wants to close when you’re positive to negative or negative to positive everyone look at we’re gonna leave the theory Atticus for now hopefully for the whole thing but whenever you talk about electrical motor electricity there’s a there’s a whole theory behind it so we’ll just keep that out but your current wants to flow like water flows down the river wants to flow in a circle and once it continuously going to circle so I know right here whenever you see it oh L that means open loop make your circles pretty much a loop right so that’s open looped this this circuit ain’t completely so now if I put these together as continuous it’s going to do a continuity check and if it’s good it’s going to be a continuous loop so continuity pretty much dance work continues Oh L stands for open loop so I’m going to make this a continuous loop by connecting these two leaves as you can hear the audible signal my meter pretty much goes down to zero it’s a continuous loop now if I wanted to say if I had a connector that I don’t think it might have failed or something between two points so I’m going to check each side of that connector and it will tell me I don’t have a continuous loop if I’m not continuously flowing from this side a connector to the other side or if I simply take this piece of wire with the alligator clips but one an unnies Pro it’s a continuous loop by taking care of cutting pliers and I snip that wire in half it’s gonna be an open loop it’s not going to be continuous so that’s the continuity stands for that’s what the continuity check is all about is to see if it’s a continuous loop or not the article stimuli here on this meter I believe anything under the lower de resistance is pretty much – si like a direct wire has very low resistance as you just seen I think what that saw like one or two let’s check it again yeah like 0.1 very little resistance the higher the resistance the more open the circuit is that it’s not flowing as as freely there’s something resistant that current from flowing and we’ll get it to that when we go to resistance so with this meter anything I’m here I think it’s 125 or a hundred feet somewhere around there anything on here at iron we’ll say 125 ohms will give you that audible signal it’s very handy because if you’re busy proven around the site a car you can listen for that signal if you don’t hear you know your resistance is above 125 ohms so you got an open circuit it’s not continuous it’s an open loop that means it’s not flowing from one point to the other way it should be especially here if you don’t have anything any resistance in that line so so it’s very handy if you’re down here you can’t be looking at that monitor while you’re probing you just listen for that signal and I’ll tell you if it’s if your company is good and its below 125 them which leads us into home test ok let’s check the resistance what is resistance resistance is pretty much something that’s resistant to flow the current from flowing through the circuit bootyman continues loop pretty much resistance can be compared to a mechanical resistance like here brakes on your car that it resists you it slows how that puts resistance on your rotors which slows down on your car so even if you pushing on the gas and you’re pushing on the brake at the same time that resistance is trying to over come the flow the power that’s just one example there’s many of the examples out there but it’s something trying to resist the flow of the current this is just some basic examples and I’m gonna go some circuits and show you more so you get a visual okay let’s get a resistor over here I got a bunch of components from month I’d also repair like TVs VCRs DVD players anything that needs to be repaired for power supplies so I got a bunch of stuff that’s a house and then my other test equipment I act like I got this awesome electronic Learning Lab that radios techniques then it comes opponents as well need to build circuits and tyrants and all kinds of stuff it’s really any a juror into building electronics I recommend you get yourself one of those electronic learning labs or they’re real handy pretty cool to have so a resistor let’s just do a resistance check on this resistor we can take a look at the band’s unless determined by the vents how much resistance it should hide it’s a 4-man resistor remember that color chart I showed it how to determine the resistance value of this resistor our first band is a brown the second bands of black the third band is red which is your multiplier and then your fourth band is your tolerance so at Brown if you look at your chart I got it ready here advance around this one black is zero so that’s ten red has a multiplier of 100 so we’ll take in I multiply 10 times 100 which is 1000 so there should be a $1000 the gold band means plus or minus 5% so if I take a resistance reading of this it should be 1000 ohms plus or minus 5% so on my own scale I got 400 okay we don’t want to select there because we already know we’re above 400 we have 4k which we’re under 4k above so we’ll select $44,000 these little clips are convenient for doing stuff like this no way I’m not touching an American resistance at my finger my skin is taking plug these into your please you got a little clips just push up there’s mouth with mom yeah it should be a thousand we determine it should be a thousand ohm resister by the band and as you can see I got an 84 it’s a little bit under but like you said that last band is plus or minus 5% so we’re within specs and that’s how you check resistance everything has some sort of resistance as a lobe for example light bulb each your governments have different resistance will take for example this 41:57 double element light bulb by looking here we’ll do a resistance check to this the heavier filament the thicker filament I can tell the leaves are the two outer ones this one investment I know you’re gonna have a very low resistance so I’ll turn turn the scale down to 400 ohms as you can see they got point six so to the thinner element as I can tell by the leads it’s the inner ones do that when they’re yeah two point seven ohms two point eight will say two point eight on average we’ll cover that more in this chapter later on that’s how you do a resistance check resistance is measured in ohms and that’s how it’s before I can’t really do an amp check right now without a circuit being built because I don’t have a logo put on it so let me go over a couple other little things here and then we’ll start building a circuit this meter here is a clamp style anteater with a dbo and built into it but this one to check your current your hands see how much current you have floatin on that river you uh you simply clamp this over your conductor well there’s a load on it and then it’ll tell you your current this meter has a couple cool it’s pretty much an auto range meter so it’s a lot easier like I don’t have to select my scale from say 400 that worked out and it automatically does that for you you just you just put it on though you just put it on the capacitance and I also has a diode check there you just put it there and then you just fill your mode and right now to the auto are you to just select the motor to capacitance continuity back to water another thing just so you can see if I pulled I am in here this one also came with the temp proof my other one has temper if I can actually use this on either meter but I would just put this in a just plug it in and you see negative positive confidence your negative register positive course you just plug that in turn it to ten but as you can see right now in here it’s 61 point eight degrees Fahrenheit I’ll turn the backlight arms so you can see it 61 point two six to one point one I could also change it to Celsius alright 16.5 Celsius we turn the back leg off see if it’s easier producing a 16.4 so yeah that’s a pretty handy option on this meter as well let’s pair together a small circuit so I could you


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