Okay, let's start off this section with a multimeter introduction because if you're in the electronics world, the piece of test equipment, as far as I'm concerned that you'll use the most will be a multimeter or a multifunction meter. And in this section up, I've picked one out, and we'll go over that. And I'll give you a link that if you want to buy this particular meter, you can get it on Amazon. That's where I got this one. And then I'll put a couple of other ones on there. This meter has CAD that I'm going to show you.

The JT w 8620. c has gone up a bit in price, it's a good meter, but it I think I paid when I bought it on Amazon and I bought it from Another company, it's the same meter. And I think this JP w company bought it back from them or whatever, I'm not really sure. And it's gone up about $25. So it's a great meter. And I recommend it. But we'll put some other ones out there that are a little less expensive for you too.

But basically getting back to this multimeter introduction, all multimeters have have the same functionality. Okay, they measure voltage, both AC and DC. Okay, they measure resistance, we can measure current, and some of them have what I call specialty ranges, and we'll get into that too. So they all measure voltage again and they all measure current and they all measure resistance which is the which is the really the bread and butter Are the nuts and bolts of what we want. And they add some whistles and bells on some meat as you'll see. So in this one again, we're going to look at the basic operation, measuring voltage, both AC and DC with the meter, measuring resistance and measuring current, again, both AC and DC.

And we'll talk about specialty ranges this meter, I believe has to we'll see them as we go up. So we'll see in the next slide. Okay, here's the meter. And what I've done is there is a manual that comes with the meter I've make it made a copy of the front of it. And here is the the actual meter. It's actually a photograph, all right, and here's what I'm saying this is what the manual stated.

And this is what I bought. All right, it's the same meter. Again, I'm not sure what happened there, one company bought another one out, but it's basically the same meter. And we have a link, you will find a link for that. And it'll bring you to an Amazon page if you want to buy this and just buy it and it would help me out because if I send people over there, I get a little bit of revenue here and we can we can keep this going. So whatever.

Alright, so anyways, my suggestion is that I have given you a PDF of this manual, I've given you a PDF for the whole manual, it's up there so I suggest you pull it down. And go along as I explained the different functions here on this meter. Okay, so here we go. All right let's let's take a look at this meter here and again here is the PDF, I put a PDF of the manual of this meter, please get it down either print it out or display it on your computer, whatever, take a look at it so you can follow along with me you'll get a better idea. So I want to start off with the one little note here. Right there.

It's a thanks for buying our products please read an instruction manual carefully before using and be familiar with how to operate and maintain it is a very useful most people when they buy something, they rip it apart and I'm just as I'm just as guilty as doing that. I can figure this out. And you know something you could probably figure out 98% of it, it's the 2% that you missed it's gonna mess you up. So anyways, I'm not saying you have to get study it and then take a test but at least look at the manual. All right before when you buy any type of device, especially an electronic device and look at it and be somewhat familiar with it, that's all Alright, what we're going to look at the speeder and and just so you'll know, we've got a numbering points here, one through 30, I'm sorry, one through 10.

And they correspond to different positions or items on the meter. So for instance, the first one is ncv lead, which stands for non conductive voltage. And basically what that is, and we'll demonstrate it when we get into that portion of the of the lecture here. I'm going to take this meter and at point I'm going to point it to in my demonstration pointed to 120 volt AC outlet and it should flash. Okay, that's an LED. It should flash.

It's okay. I use something other than this for that that works I think a little bit better and we'll show you that when we get there. All right, point two or position two right here is right here. They actually look at the meter it says LCD display LCD stands for liquid crystal display. That is a type of display. One of the reasons they use an L c d display on a volt meter because a volt meter is energized or it has battery for power.

An LCD display will will draw very little currents. So therefore when I put some batteries in there, they should last I You notice it says three and a half inch digit LCD? Well, where's the half? Not really, there's no half there. It's, it's the way they describe it. Basically, we can get three full digits and then get a decimal digit there.

So, maximum reading okay would be 199 volts. I take that back, whatever whatever it would be the the maximum number of count I can get is one nine, dot nine, and which is 2000. counts. Okay. So I that meter cannot go over 2000 counts. All right. Okay.

So the highest we can go is from zero to 19990 1000. And 999 which, if you count zero is 2000 counts, all right? Okay, so let's go on, let me clear the slide and go on to number three. Okay. Number three is the Astros create key, press this switch to turn on the backlight, okay with the meter. If you press that number three, you'll see that the, the meter face will illuminate.

That's what that asterisk is for. Okay, we have number four is number three is number four. Right here number four, we have the hold key. And when you press the whole key to toggle in and out of the date, data, whole mode, in other words, if I want if I'm taking a voltage reading and for some reason, I want to hold that reading I'll press the hold button, and the meter will latch a hole that reading I, once I press the hold button again, it takes it out of hold mode and then I can resume measuring voltage. So when I press the hold button and holds the voltage on the meter, okay, and then it I mean, if I take my meter leads, and I try to measure another voltage, it's not going to display on the meter. Okay?

Because I'm in hold mode, h o LD mode. All right. So that's what the whole function is. Okay? To hold a meter reading. Number five is the select key.

This is chosen by the function. All right, the select key. All right, what do we mean by select? Well, even even they didn't give me A very good explanation of stock. So I'm taking my meter out and turning it on. And what the select key will do is if I'm in, for instance, if I'm in voltage, and if you look at voltage here, right there, you'll if you look at that, you can see that there's a straight line or a sine wave, okay?

When I hit the select key, it will tell me if I'm in if I'm measuring DC volts, or if I'm measuring AC volts, so when I hit the select key, I, I will either get a small sine wave up here, which means AC, or a straight line, which means DC. All right, that's what the select key is. It goes to Depending on what function in other words when I might take my dial this dial and I select my function here, my select key will select the function in that particular section, okay? Again, if I'm in the voltage and I hit the select key, I select either AC voltage or DC voltage. Okay? And I guess that's what he's saying here.

Select key can switch DC AC ohms diodes or beeper are when we talk about temperature, Fahrenheit or centigrade temperature, okay, so that's what the select key will do. All right, it's selects what function or which property I want in a certain function. Okay. All right. The next one is number five select key. I'm sorry, the neck it's number six I apologize number six is the range key.

Press the range key to select manually the range and to change ranges when the range key is press once the auto indicator indicates the range when the range key is pressed once the auto indicator turns off, and the push range key to select the appropriate Okay, so what is what does all that mean? I mean, there's a lot of jibberish What does all that mean? So basically what happens is when we hit the range key, we move the decimal point here so we can either get a finer reading or less of a fine reading. And notice right up here it says auto, okay? When I hit the range key That auto designation on the meter will go off because basically when you're an auto, it's saying, Okay Mita you pick the best range for reading this measurement, may it be voltage and current ever. Alright?

So when it's on auto, you're allowing, you're allowing the meter to select Fast. Fast range, okay? So that's, that's basically it. For the most part, I leave mine on auto, and I read the measurement I may hit the whole key, which we talked before to get if I'm really if I really need to look at something very closely, I may use the range key but I would say for 90 to 95% of the time I leave it on auto and and we're good. All right. So let's let's let's go on to the next one.

Which is seven with the rotary. Basically, that's easy. All I do is take this here, and I turn it to whatever function I want or whatever, whatever I whatever I want to do. Okay. So all right, let's go on to the next one. Talking about the inputs on eight, nine and 10.

And that would be here, here in here. I may go a little bit out of here. Okay, for instance, on nine, we have the common input, which is brown. And if we're measuring voltage that will connect or clip on to a ground lead. And we'll take our input terminal positive input terminal, and we'll we'll use that to measure voltage or we can use it to measure current and we'll see this when we get into the lab. But a little bit better way, but I'll just leave that at that at this point.

And the other thing I want to mention is this input, and that input right there. All right, if I'm measuring current, the most current I can measure with my meter lead here is 10 milliamp hours. If I need to measure a higher value of current, I need to take this connected here and plug it up here. And you'll notice this 10 eight here, that what that's telling me is I can measure up to 10 amps when I have my media lead on common and my red Mita lead on 10 a, that that means Okay, so I think we've gone over this and and you'll see it a little bit clearer. When when we do actually do the voltage measurements. It's an overview with some of that may be a little bit fuzzy, but quite honestly not that difficult.

And when we go into the lab and and look at some measurements using this, it'll come clear especially if you buy a meter. If you bought this meter, whatever ever, and you start using it, you'll see that it's not as difficult as, as its. We're going to stop here and go to the next slide. Okay, before we go on, we'll look at the gen three features. We got a three and a half digit display, maximum display is 1999. All right, meaning up here.

So that's the highest count I can get which is 2000 counts if I start from zero and go to 19999 is 2000. counts. All right, so that that's that when they say automatic polarity display, it'll it It'll show you either a plus or a minus here, obviously, and we'll look at that, too when we do some, when we actually get in there and look at some labs and measure some voltage. All right. Here's the deal. maximum range display is Oh l. So for instance, if, if I go to some Maxim display, I mean maximum range. And for that range, let's say my range is like 20 volts.

All right, and I go to the 15 volt range. Well, 20 volts is higher than 15 volts. So I'm going to see Oh, well, which is overload or over range, meaning the voltage that I'm trying to measure is higher than the range on the meter. And I have to have to adjust it. Okay. Just so you'll know.

And I'll double Check this but I believe the highest range on this meter is probably I take that back because I looked at the specs and it's 750 volts. So let's forget about this. Now there's another chart that I'm going to go through when it goes to maximum ranges. I'm trying to pull it from memory. I don't want to go there right now. All right, operating temperature, maximum 40 degrees C. So it looks like that's probably around 150 degrees Fahrenheit, because 20 degrees C is probably around room temperature, which is around 70 degrees.

So 20 degrees C is 70 degrees F approximately. So if I double that, it's probably about 150 degrees, so you'll be dead or you won't be working in that atmosphere. Alright, so you don't have to worry about the meter. That's of course if you know, I didn't Some environmental suit or something like that storage temperature you got to keep it is minus 15 degrees to 50 degrees C. Alright, so that's the storage temperature. So that's probably about 30 degrees below zero and probably around 85 to 90 degrees out. Battery volt batteries a nine volt battery, that's that's basically what that means any standard nine volt battery will work.

Okay, you have a low voltage indicator, which is this little battery terminal and that'll that'll pop up on the display. So when you see that little battery indicator, that means your nine volt battery is low. So please Please replace it, okay, and he has the physical dimensions is the physical weight, it's in grams and millimeters, you can you can convert that. Alright, that that's pretty much it. So let's clear off the slide. And right now what I'm going to do is going to the back of the specifications, we're going to go over the electrical specifications on this, which is the different ranges and that and the accuracy of the meter and that type of thing.

So I hope you're not getting bored. I wanted to go through this somewhat thoroughly. So if you're new to a volt meter, you kind of can understand it and take some of the mystery out of it. Some of the presentations I've seen on the, on the internet on these things. Yeah, they're good. They just say, you know, you put the meter here, you turn it here and you measure the voltage or measure resistance.

I kind of wanted to go into a little bit more detail on that and see Start making you understand because you know, you're in electronics. And when I place this thing across a component of the electrical circuit, I can really change the characteristics of what I'm reading. So sometimes you need to understand your your test equipment. Because if you place a piece of test equipment across a component, depending upon the design, the value of the meter, the input impedance of the meter, which we'll talk about later, you can actually change the value that you're reading that may or may not discriminate on how you approach repairing a circuit or doing it doing a design upgrade or just simply designing it. So that's why All right, that's why I get a little bit anal here. Alright, enough said on this.

Let's go to the next slide.