hi welcome to product tutorial by Robo Jax in this video we are going to learn how we
can use this volt ampere meter that can measure up to 10 ampere hundred volts that is sold on
eBay and Amazon we are going to see how we can measure the current and voltage with this then
I'm going to show you if the voltage and current is not accurate how to adjust and fix it through
this shunt resistor this wire is a shunt resistor and and we have some voltage drop proportionally
to the current measure the voltage and see how much is that voltage let's get started with us
this can measure the voltage up to hundred volts and in terms of current it can go up to 10 ampere
so this is compact and it's taking very less space and it can be installed and boxes for any purpose
that you have this is one of the VA meter volt and ampere meter that is sold on Amazon and eBay
website and it shows around $2 84 cents or on Amazon for about $10 plus shipping
and there are different color as you can see here this is red and green we can see
green and blue and also it has a label here DC but all of these are the same
we need to give the package they will put it in a bag something like this we have to wire
fears death portion under the thick wire this can measure up to 10 ampere so how it works
is that this needs voltage to operate first that you have to know it that it needs a spawn voltage
regardless of what it does and then to display the voltage of something then you need to connect the
different wire and to display the current you need to connect different wires these to work together
you can display the voltage or we can display the current and the voltage of the same power that is
used for the current. so they are not independent you might get it with a red black and white or red
black and yellow in both cases red and black is the main power to power this up and the yellow is
to measure the voltage and displayed on the screen when you connect it to the red and black it just
powers this up you will connect always these two main wire that are on the left side red and black
to power this up to measure the voltage we will connect this for the current there is a thick
wire because it measures up to 10 ampere if you are using longer wire make sure to use very thick
wire they views here 18 gauge wire that you see this as a shunt reversal here the tech wire when
you connect it the current comes passes through this resistor and goes back and then the voltage
that drops here very little voltage will be amplified and displayed as a current on the screen
the length a forty four point nine millimeter by 26 millimeter and the depth for the frame is
seventeen point seventeen point three millimeter to see how much space we got 36 millimeter
to do the tests I was first supply voltage to this this is my power source that i'm supplying
something above 5 volts up to 30 volts doesn't matter to make this active by clickin acting
the negative to the negative and positive to the positive you can see now it's on now to display
the current I'm measuring a current this is 1 ohm 50 watt resistor the accuracy of this one is at
tolerance is 10% so it goes up and down but for us it's okay to understand how we measure the current
let me explain this we have a battery and we have a load the load has two terminal positive negative
and our battery as positive negative positive will be connected to the positive of the load from the
battery also the negative will be connected to the negative now in order to connect and measure the
current only for the current we can connect it and ammeter onion per meter that you have either this
way that in between the in the path of the current you can put it like this either on the negative
wire side or you can put it on a positive wire side doesn't matter you can put your ampere meter
to display the current but because this they can display the voltage and if you want to measure the
same voltage of the current that you're measuring then you have to put it this way meaning that this
has red wire the red wire will be on the negative side of the load and the positive of the load will
be connected to a positive and the negative of the ammeter will go to the negative of the power
so positive goes to the load and then from this side it exits now this will be positive because
it sees the battery and it enters a meter and it exerts and the circuit is completed by going
through the negatives this is my battery normally if I want to connect it to the load it doesn't
have any positive or negative because this is just a load you were just connect it like that
and the current will pass right now it's around 6 ampere is passing through this with a voltage
that I have I will connect the positive from my battery to the load and then from the negative
I will connect it to my ammeter so positive to the load let me plug this in now this positive
will be connected to the load I have here a cable connecting it and connecting the positive in here
negative is hanging let me connect this let me put this so you can see it and now I connect it here
and as you can see we are reading the current but we are not reading the voltage the reason
for that is that this wire is hanging to read the voltage I have to connect the yellow to the
positive doesn't matter battery or load it's the same wire and if I put this here you will see that
I'm reading the voltage at six point nine volts let me use this wire so it's holding it for me
right now the current is not connected that's why we can read only the voltage
and not the current I'm connecting it now and as you can see we are reading the current the
voltage is 10.8 now input voltages six volts let me increase it you see the current let me
reduce it then go to the lowest that even I can go zero point five and zero point
even a 0.1 volt you can read it the reason for that is that this voltages are really between
five to thirty volts so it has main logic power to operate 0.1 volt is the voltage
of the battery or power supply that you are measuring for the resistor or load and it
shows zero point one three ampere this might not be accurate or I'm going to test it next
if your input voltage for the load is between 5 to 30 volt then you don't need external power
let's say of seven point three volts for this power in that case you can connect this directly
to the same power connect the yellow and red together twist them now the voltage that is
supplied and the voltage that is displayed is the same and this is a negative I'm connecting
negative to the negative I'm going to connect these two wires that is twisted together to
this positive now the meter is ready I need to connect this to this and as you can see
it shows now input voltage is the same as the operating voltage of this one and if I
go between five to 30 volts that simply works fine but here is a problem if this power is
less than five volts this will shut off let's see at what voltage it will shut off six volts
5.34 nice let's wait three point six now it's getting dimmer you see so three point
six still it's good I've spent quite some time testing this and preparing
editing and uploading this video so you can use it easily the least that you can do for
me is to hit the subscribe button and leave the notification on it's really appreciated
this is the electronic load DL 30 31 and these are the two terminal that from the
circuit will be connected in here and we will see the voltage here and the current I've connected
it now to electronic load the voltage that is here you can see it in here and the current we
will see here and we will read it here and I can set the current here for example this is
at the moment 500 turn it on this 5 ampere is now displayed here and we can see 3.2 that's 3 point
4 volts the voltage is displayed me includes the current sex amp I increase it to sex 7 ampere you
can read it in here that's the accurate 1 8 9 as you can see 8 9 and now we are at an impaired 9.99
and let me increase the voltage and here we can see this is the
voltage of your reading and that is a voltage it's displayed the original one
so sex impaired is being drawn and we can see the voltage do not worry why the current is
concerned because I've used here CC constant current the job of this electronic load is to
keep the current constant let me reduce let me make some changes at the decimal point so it's
five point seven here we are reading five point seven and two input voltages drooping
six volts and the current is zero point two three two hundred and thirty milli ampair
let me show you inside this because this is very thick I can do that just pull it from here
the current the voltage is still there should we just connect so we can see that the current
is going on source comes here from the positive to this point and from here it
goes through this shunt resistor this wire is a shunt resistor and from this point it
goes to death and exits so the whole point is that it comes and it passes and we have
some voltage drop proportionally to the current now let's measure the voltage and
see how much is as voltage is 10 ampere exactly and it shows nine point nine six
let's measure the voltage here across this forty eight point seven Mary bolts
so I put it on hold now we have ten impaired passing through this resistor and by Ohm's
law we can see R is equal V over I and that's a voltage zero point zero four
eight seven that is forty eight point seven millivolts divided by 10 ampere
and you can see that this is four point eight seven milliohm zero point zero four
eight seven so this is forty eight point seven million resistor resistor perhaps it
might be fifty I don't know for the eight point seven million that's very accurate
going to show you if the voltage or current that you are reading is accurate how you can
adjust it you need to first trust the thoughts this is very accurate this electronic load and
here we have two potentiometers one is here it says add just a DJ I and this one a DG V so this
is for voltage this potentiometer you need a flat screwdriver and this is for the current
a little there is some difference and design for example this display chip is in the same
position the voltmeter that is here in this case it has been between these two and then
voltage regulator is in here what and this one is on the other side but the two potentiometer
this voltage adjust is located here and then current adjust I adjust is located here this
one they call it a just I and I just so there is a model printed on this one does
not doesn't matter because it's the same chip so the current I'm gonna rotate it see
oh let's adjust the voltage as well 3.5
and then let me go to the right clockwise
it's fully clockwise this way you can adjust the voltage and current to get
accurate value thank you for watching this was how to use this volt ampere meter if you
learned something please stamp up if you have comment or question posted a comment
section below I try to answer a reply and do not forget to subscribe thank you
you