Okay, now we're going to look at the specifications, the electrical specifications of the sphere, and we're going to start off here with with DC voltage. And again, this, this is part of the meter manual that I've uploaded. And just make sure you pull down the PDF and you can follow along. Alright, we'll talk about range here. And the range here is from 2000 millivolts to 1000 volts, and that's the range. So for instance, if I'm going to measure 150 millivolts, right, I suspect that my voltage should be 150 millivolts.

I want to be on the 200 millivolts squared scale. All right, all right. And that's because my resolution will be 100 micro volts. In other words, I can get down to 100 micro volt resolution, which is actually 1%. of fun full range which is 200 millivolts. All right.

Same thing with two volts here. Okay, if I'm gonna, if I'm gonna measure like say 1.5 volts 1.4 volts, I want to be on the two volts scale. If I haven't said it, let me emphasize this. This is the maximum voltage on that particular scale or range. So if I'm reading, or if I'm measuring 2.5 volts, and I'm on the two, two volt rails, range, I'm going to get that ol that we spoke about in the last section overload or over voltage, RM over range, whatever. Again, I'm a half a volt over two volts, the meter can only go up in this, this instance two volts, so I get that error message.

And the same thing here 2200 1000. If I'm going to measure 25 volts, I'm not going to be on the 20 volts scale, I'm going to be on the 200 volts scale. And if I'm going to measure 300 volts, I'm not going to be on the 200 volts scale, I'm going to be on the thousand volts scale, because that's the highest measurement. Okay, my resolution again is how fine I can go down. So for instance, if I'm measuring 20 volts All right, I should say if I'm on the 20 volts scale Right and measuring the voltage is actually 15 dot 123 milliamp ers milli volts. Let's say it's 15.123 millivolts.

All right, I can only get to a resolution of 10 millivolts. So if I calculate 15 dot 123 volts, my meter is only going to read 1.20 volts or 1.30 volts, it's not going to get those units, okay? And that's and that's what it means here, okay? The accuracy of the Real quick on this one is plus or minus 5%. So basically, when I calculate a voltage reading my my meter can only be as accurate as 5% of that upper or lower limit plus three, and the three is the three counts on the meter. If you remember in the previous section, all right in the general section that said the meter can go has 2000 counts 021999.

Well, the accuracy is plus or minus 5% plus three counts. All right, three counts on the meter, okay, or three counts of the least significant digit on the meter, the digit that has the least amount of weight. All right. The same thing here, only the difference is it's point 8%. All right, but for the most part what I'm getting, I'm getting really, really anal here. Okay?

I'm getting really, really anal here. for general purposes, this is more than adequate, okay? more than adequate. If you're going to measure voltage, again, it's not a big deal. All right, let me stop here. Clear the slide.

We're going to go to the next one. Okay. Okay, now we're talking about DC current. And basically everything that I've said about voltage is the same as DC current and just, I'll just state it here. When we're measuring voltage, we put our meter in parallel, and we're measuring current, we put a meter in series and I'm going to demonstrate that when we get into the lab and I measure voltage and I'll put a resistor in And measure current so forth. But I just thought I'd throw that in here now.

So that's really the only difference. The only differences were in how I place my media leads. But as far as the range, everything I said about voltage is the same. Obviously, we're measuring amps, either micro amps, or milliamps, or straight amps. But everything's the same. For instance, if I measure if I calculate a circuit, they have 10 milliamp hours flowing through it, well, what's what's the best scale to have 20 milliamp hours, all right, if I use the 2000 micro ampere scale or the 200 micro ampere scale, again, I'm going to get that over load or over over a range display on my meter and it I know that I've got to go up one that that's basically it ought to.

Okay. So that's what that means. And two amps 10 amps again, if I'm measuring, if I calculated a circuit, you know, I wanted to measure the current flow through that circuit. And I calculate the current is 1.25 amps. Well, where do I want my meeting to be? Sitting at probably the best resolution would be the two amps scale.

Yeah, I can use the 10 amp scale. Not a problem. But I would get a better and a finer reading at the two amp scale that I went with at the 10 amp scale only because if you look at my resolution, I'm done a one milli ampere at the two amp scale. So in other words, when I mentioned that current, I can go to one milliamp hour, whereas if I have it here at the 10 amp scale I would go to the closest 10 million. Alright, so that's pretty much it. So let me clear the slide off, we'll go to the next one.

And the next one is AC voltage. And again, everything I've said about DC voltage is the same as AC voltage, the meter. The meter doesn't care as far as a treating and its accuracy. It just says okay, the only difference is ones and AC voltage and one's a DC voltage. And again, look at what we got here 10 megohm, four AC voltage and can megohm for DC voltage, so that's the same, and we call it input impedance again, hang on to that I'm going to demonstrate something a little later. All right, now let's go to AC current.

And again, everything I said about DC current is the same on AC current. The only difference says, I'm measuring AC current and not DC current. But my range and my resolutions are the same. All right. All right. Last is resistance.

All right. So for instance, if I have a 50 ohm resistor, and I want to make sure that that's 50 ohms, what scale would I use? I would probably use a 200 ohms scale, because my reading of the resistor would be point one ohms. Yes, I could use the two K, I could use the 20 K. I could even use a 200 K. But guess what? The the measurement that I make of that resistor is going to get more coarse meaning I'm not gonna see the complete value that, all right, and here's my accuracy. And this Remember, this is plus three, in this case from here to here is plus two.

And this one over here is plus five. All right, so take a look at that. Again, when we start using the meter, you actually use it you start measuring voltage, current resistance and you play with the scales and the ranges, you'll you'll this will be very, very obvious. You'll see what I mean. Okay, let's stop here and go on. All right, we're gonna do some measuring now voltages.

And right now I what I've done is I put the operations part of this little manual on here, and we're gonna look at the first part here where it says DC measurement. Okay, and basically Let's just go over this, connect the red meter lead to the volt on hertz input of the terminal. All right, and select the the rotary switch to volt. and that right here, that's AC and DC, then press Select button to select the DC voltage measurement mode and connect the test lead to the circuit to be measured. Alright, so let's take a look here at our meter, and there we go. Let me move on.

We need to move some of these things out of the way. So let's move this and let's move these leads away and let's put it on off position. But if you look at the handout that I gave you, there's my comment or Right there. There's my volt on and milliamp. Alright, here's my meter. And I'm going to turn it on.

So I'm going up to the voltage selection with my rotary switch. And you'll notice that we're reading zero dot dot 006. Well, if I shot my leads, which I'll do now, you that should go to zero, and it does, all right, that's just picking up spurious radiation or undo very small voltage in the atmosphere or just plain noise, so it's nothing to worry about. All right, so you'll notice that right now when I turn it on, I'm on the voltage selection, but I'm selecting AC voltage which is right there. If you can see this sine wave. It's a small sine wave and What we want to do is we want to, we're going to be measuring DC voltage.

So I want to change that to DC voltage on this meter. We do it by pressing the select key. And you'll notice right here, I've got a solid line and a dotted line. And we know that that represents DC volts. Okay. The other thing that I want to point out is the auto here, okay?

On this particular meter, we have auto ranging, meaning that the meter when you turn on will select the best range to read the voltage that you want, and when you're on auto, the meter will will automatically select that I. So now let's measure voltage. And what I'm what I'm using here right here is an old computer power. Supply. And the reason I selected that is because that's what I had. And I thought that would be kind of neat to do.

So, plus it's got a little connector here and it makes life a little bit easier with these probes. So I did that. So I'm gonna place my probes in there notice and it was already on. I'm measuring 5.12 volts, DC. All right, and I'm on auto range. Okay.

So now, if for some reason I want to change that, I can select the range that I want by using this range button here. So now I hit that once you'll notice that the auto is gone. So in this particular meter, and they're all a little bit different So you need to look at the meter that you're using, because, yeah, they'll all measure voltage current resistance, some of the functionality is a little bit different on these meters. So on this one, when I hit the range key once it took it off auto now, when I hit the range key again, my decimal moves over, right this way, and I'm actually losing resolution because previously, I had three decimal places. Now I've only have one. Previously, I was reading 5.12.

And because I moved the decimal point over, I'm only reading 5.1 that may or may not be significant. It really depends upon your application and what what you want to do. So we've, we've done that, and if I hit it again, it's going to move again and now I'm getting between four and five Alright, so I've lost a lot of resolution. Let's let's do again. Let's hit it again. And now because I've moved the decimal out, all right?

The rain it's overload, meaning I can't measure that voltage on this range. And let's do it one more time. Still that and let's do it one more time. And now I'm back. Okay, but notice, I'm not on auto, the only way for me to go back on auto on this meter is I'll turn it off, turn it back on, it automatically goes on to DC. So now I have to hit my selector key.

I'm back to DC and I'm in auto. Okay, so now I'm reading 5.13 volts, so one, two volts, alright. And that's pretty much it. So let's, let's do This now before we move on this connector here, okay? Red and Black is five volts. And I happen to know, when I go from the yellow to black and black is my common.

It's going to be it ideally it should be 12 volts, but it's not. It's actually 11.41 volts, right? And that's probably why this this power supply got in the junk pile. It's been a while. I'm not sure why put it there. And that's, that's probably the reason because ideally I should be reading 12 volts, I'm off about six tenths of a volt, so it couldn't do what it was supposed to do.

So there we go there. And that's it. So there's two more buttons I want to talk about. One is the backlight button which is here and You probably can't see that because I've got lights going for video, you know, recording a video here. So what we'll do is take my word for it. Okay?

Take my word for it, it lights up. Now the other one is the hold button. And if you remember, I spoke to you I says, okay, the whole button will hold the reading for whatever reason. So what I'm going to do here is I'm going to hit the hold button, and notice you'll see hold, come up here, right there. All right. And what I'm going to do now is I'm going to go over and I'm going to turn the power supply off.

And notice it's still holding my reading 11.41 volts. I'm gonna take it off a hole now. All right, and it should go down. It's actually it's going down. There's probably some type of storage. Maybe there's even a little bit of a capacity in here but it's discharging and, and notice it's discharging towards zero.

All right, it's getting there. If there was a little bit more of a load on that, it probably would have gone down faster. All right, but now I'm going to plug it. I'm going to turn it back on. And now I'm back up to around 11.4 volts. All right, turn it off.

And it should Yeah, and it's did strike decaying or going down. So that's it. So those are the that's an introduction to this meter. My hope hope that takes some of the mystery out of it. I'm going to put this meter up and we're going to look at one other. One other one other thing, one other meter in a minute.

All righty. So I'm going to stop here. And we'll go on for a minute here with the next one. And we'll look at look at this other meter. All right, thanks.