in this video we are going to be learning the first measurements that we are going to be doing with the multimeters which is the function or measurement of volts
young how are you? Edgar here again happy to greet you this morning, I hope you have already had a good coffee
be awake and want to learn
again I want to clarify that we are doing a course to create good foundations, a basic course, a course that nobody here knows anything about
we are here from 0 ok, if you want to investigate, if you want to get a little more involved in this I recommend that you read
that you look for more information on the internet, there is a lot of information. I am trying to cover the theory pretty quickly
to cover the terms quite understandable so that we can get into what is practice, let's remember that we are dedicated to repairing devices
and what we want is to start producing, start playing these plates now ok, so with the above we are going to start with today's class
Today we are going to be seeing what is the function, measurement, volts scale ok, what are we going to be doing here?
we will be measuring the voltage remember the force with which our electrons go
we have seen that, arribita in the previous lessons in what has to do with the concepts, so here we will be seeing the practice
of how we are going to be measuring those voltages, of how we are going to be measuring that voltage. we are going to do it both in an autorange multimeter and in one that is not autorange ok
so we are going to start with the class, we go to our multimeter remember that before starting any measurement
we have to know what we are going to measure, we have to first place the function on the multimeter and then measure
not first we put our tips and then we change that is not so, then we will go here
What are we going to measure today? we will be measuring what is voltage
in voltage we have 2 options what is direct current or direct current ok
when we are working on mobile devices we are going to be working on DC direct current
alternating current comes from the poles, enters our house and then enters sources, enters transformers
so we are going to be working in DC, make sure your multimeter says DC
direct current, now it is important also if you want to measure direct current here in the function button I come and I already change it to AC
in this way I can measure for example a cable that comes for example for my computer I can see if that cable is cracked
If the street voltage reaches this cable, here in Guatemala it works at 110 in other countries 220, 140, etc. Right
So in this way we will be measuring what is alternating current, for example if I wanted to measure how much voltage this cable from here brings
this cable here that comes from what is the wall in this case, so I put my multimeter in volts I put it in alternating current
Now, let's remember that we are going to have 2 tips for the multimeter, we are going to have one positive and one negative as we learned in the previous lesson
Com is mass and what has to do with positive is here, so what I am going to do is for example place here
and there the multimeter is telling me that in this socket the cable is delivering 122 volts of direct current, right
Now that I am going to measure a plate I come, I am in volts I turn off the function button and change from AC to DC
this would be the first, so we already have our meter ready to check the voltages and the direct current
Now we are going to do quite practical exercises here
Now that we have learned how to measure voltage in alternating current, now we are going to move on to measuring direct current.
always measuring the voltage or the voltage
here we already have our multimeter and we have it where it says DC, and here we have it again in volts
we have our tips, the positive one where we are going to measure voltage and the negative one always to ground
then we will start with the simplest, in this case we will have a battery here, here we have an iphone battery
so what we are going to do is look for the positive and negative poles of the battery in this case one is this and the other is this
if you notice my multimeter is telling me ok Edgar you have a voltage of 3.9 volts but negative, why negative?
because I have my tips backwards from the battery, now if I pass the positive here
and I put the negative here, now if you give me my value you are telling me that my battery has a voltage of 3.9 volts
this battery takes 3.8 volts means that this battery is super charged, now we will continue with another example easier
I can come and connect
my charger, I can connect it here
then after connecting my charger I need to see that my charger between 5 volts that pass through here and reach my board
we are going to put the negative tip on any insert here and we are going to measure the 5 volts, we are going to see how much the battery delivers, how much the charger delivers
and we are looking at the multimeter that seems to deliver 5.2 volts,
Another measurement that you can practice is, I need to know how much voltage reaches the positive pin of the battery, I already know what the positive pin of the battery is.
Don't worry, we are going to learn this little by little, so I know that a working phone has to give 3.7 volts to the battery
again I put the negative on either side and measure the positive pin of the battery
How much it is delivering, this means that my charging circuit is delivering 3.7 volts to the battery
These are quite simple measurements, quite easy that you can do, now what are we going to do?
we are going to prepare a plate, and we are going to go to what is now the microscope ok, here where we were
So I have a plate, we are going to make a little drawing to see how all this works
so for example I know that here in this component that we are going to see later, a voltage passes
here a main voltage passes, this is a capacitor
therefore a capacitor that we will see later, has a positive side and a negative side
so I'm going to measure how much voltage is going through that capacitor or that line ok
So here we begin to see a couple of terms with which we have to get used to, I'm going to connect the battery of my phone
In this case, what I connect is a source here, a cable with a source and I will turn it on
let's turn on what is our phone
I'm turning it on there and I need to know what voltage or what voltage is going through there
again I have my negative point that I am going to put it on the ground, dirt can also be above this circle or it can be for example if I am going here
this insert here, or this here can also be earth
beware, do not get confused because sometimes on some plates they may think it is ground but it can actually be an antenna
and when you put it there it is not connected to ground and the multimeter will not deliver the measurement
we will learn those things later, for now we will learn that this or any insert you see is thus grounded
So I put myself on the ground and now I'm going to find out how much is going through that line, I play with my multimeter here and I see 0, why 0?
because maybe I'm touching the negative side of the line, but if all the positive side here I already have a voltage
means that this line, in this capacitor passes a voltage of 3.9 or 4 volts
Now let's do this exercise, if I go here I have several capacitors there I have several components that as I say we will see later
I'm going to turn on the phone and I'm going to start playing condenser by condenser
I'm going to touch this and it tells me that a voltage of how much passes through here? of sorry
1.8 volts
if i go to this line here, this is the negative then it will mark me 0. let's see this capacitor which line goes through here
here a voltage of 3 volts passes, now that it will pass through this capacitor here let's play and here also 3 volts pass
and if I play around here what happens, 1.8 happens. and here we have, a voltage of 1.8
here we will have a voltage of 3, let's remember that we are touching the positive side of the line and here if I touch the negative nothing happens
If I get a little closer to this so that you can see well what I am doing is, I touch one end of this component, it does not give me anything because I am touching the negative
but if I touch the positive there if it gives me the value that is, if I touch this it tells me that 3 volts pass through there, 1.8 volts pass through here
and that way I can go touching all the components and see what tension is going through those components
Now if we go make a little drawing of what we just did so that they more or less understand what we did
I have here my battery, positive and negative
so how does this work, look at how the battery reaches a connector
Right, here is the positive pin and here is the negative pin, here is a line, here we are on the phone
this is already the phone connector where you connect the battery here it happens and this gives a positive line
and there is also a negative line
we the first line we touched was called Vcc_MAIN is a main line
we will learn later, that line has a lot of components connected in its path
what we touched was a capacitor, a condenser has this like this and on this side
it's negative
If I did a little drawing, this would be like this
true, this would remain so. doing it with a drawing and without making the symbol
so what we did was come and put our positive tip of our multimeter we put it on this side of the multimeter
and the negative tip of the multimeter we put on this side of the component and that way it told us that you had 3.9 to 4 volts
Something I also want you to understand is that your multimeter will have 0.000 so this would be 1 volts
after the point here, this will be millivolts ok.
so for example if I have 0.100 it means that I have 100 millivolts
if I have 0.010 it means that I have 10 millivolts
if I have 1,000 it means that I have 1 volts and if I have 1,800 it means that I have 1.8 volts
then the point here is millivolts and here they are volts
That is a term so that nothing else is confused
In this way we will be measuring the volts, remember that what we are measuring is the voltage that goes through a line or the voltage that passes through a component
In order to know the force that these electrons carry, suddenly we are going to see a line that had to have 3.9 volts. It turns out that it has 1 volts.
so that's where we start to find the problems
this is the first measurement that we are going to do with our multimeter, I hope you liked this class and always make the most of it
a hug to all, take good care and see you tomorrow in a next lesson, bye!