I'm going to show you how to use a multimeter in this video here I'm going
to tell you what to look for when you're buying one and how to use the different
options available on here and the difference between those options and
difference between a inexpensive and an expensive multimeter so let's get
started with this right now
I'm Tom Kvichak and this is Toms Trains and Things this channel was
created to help other modelers who are in need of guidance in pursuing their
dream of building a model railroad and you're going to need a multimeter while
you're working on your track and other components on your railroad and I'm
going to show you how to use one here now it doesn't have to be this one here
this is an old one this discontinued so don't try to look for this model here
but you could buy them anywhere any place that has hardware even Walmart has
them and just look for the best price now for model railroading you're not
going to need a lot of options on there you're going to want DC voltage maybe AC
voltage to check your outlets resistance and amperage now a bonus would be for
capacitance and for checking diodes not all meters have them on there but that's
an extra feature that you could have this is an auto range multimeter which
means that you just have to set it to your ohms on here for resistance and
it'll automatically select the range on there some multimeters are going to have
a lot more data up here they're going to have a lot more ranges to choose from
and don't worry about that I'll show you how to use those also those are the ones
that don't have the automatic range on it so you know it's always good to find
one if you can with the auto ranges on them the the price of multimeters are
getting less expensive now so you could probably
pick up a good multimeter for about 30 bucks some meters have just three
options for probes some of them have four on this one the amperage is auto
range on air up to 10 amps and it will go down to the milliamps like other
multimeters but some of them multimeters will have a fourth one on there and then
it will have amp and then milliamps this is an easy one where you don't have to
move the probes around a lot just for checking all your functions from here
and the amperage is over here on the ones with for you you might have to
change it from the the amperage to milliamps before I go any further with
this I'm going to talk a little bit about safety okay every multimeter is
going to come with a set of probes on it you're going to have a black and a red
one do not see you missing last circuit unless you know what you're doing unless
you're in an electrician turn everything off put your probes in there then turn
it on that's the best way to do it be very careful because electricity can
kill you always be careful know what you're doing
and turn the circuit off before you start poking your probes in there so be
careful that means you you all of you this meter is a fluke 111 - RMS
multimeter and the reason they call it a multimeter is because it has several
functions on there that you could test with it now we're going to talk about
the AC voltage to DC voltage check continuity with a beep the resistance
it's going to show you a reading in ohms this is for checking diodes is for
checking capacitors we won't go into that on this discussion here that's a
little bit more advanced I'm just to give you the basic ones and this is
for reading AC amperage and this is for reading DC amperage we'll talk about the
DC amperage on here we're going to do voltage continuity resistance and DC
amperage and I'll show you how to do all of them there you have three places
where you could put your leads the common lead you're going to have your
black one there all the time okay whenever you're going to check amperage
you're going to put your red lead in this one here some multimeters have amps
and and milliamps so but this is an auto range so you just have one here now for
the voltage the resistance the continuity the diode and the capacitor
you're going to put your red probe in this one right here as far as the
functions go on here you have AC voltage you have DC voltage this is a continuity
checker this will show you resistance and this will be for diodes and
capacitors which we'll show in another one and this one AC amperage and DC
amperage some multimeters will have
ranges in the voltage and the resistors and the amperage
and I'll put a picture up here and showing you what that is over on this
side over here but anyway this is just a simple bow right here without all the
different ranges on there because it's the ranges are set internally we're
going to start to saw fighting DC voltage on this so I'm going to put the
probe black probe in the common and I'm going to put the red probe in the Volt
ohm diode and capacitor plug right there all right okay we have DC volts right
there now whenever you're checking okay
now it shows up nine volts minus nine volts that's a good this is also a good
way of determining which lead is the positive and which lead is the negative
your black lead is the negative lead but I had it on the positive so if I turn it
around this way it shows 9.0 volt that's a good battery
right there okay now before I started this I pulled up the first battery I
pulled out it wasn't a good battery okay now I'll put the leads on here oops it's
going flying you have 6.3 volts okay that's telling
me that that battery isn't putting out nine volts and it's going to tell you
whatever you have it in it's going to say replace this battery now we're going
to do AC volts and we're going to do it on just a regular power strip and right
now I have the power turned off so I'm going to put the probes in here put it
on my range for AC volts and you see this right here that's normal you'll see
that all the time I'll turn the power strip on and 122 volts now we're going
to do the continuity checker that's this little
like waveform right here you see put the leads together and you get a little
beep on there alright so we'll just test things here that must not be metal right
there then on the screwdriver okay here's my
soda can okay on there no continuity take one of these bread boards no
continuity like that but if I stuck my probe inside there you would get
continuity so we'll go over to ohms and when I put my leads together it'll show
up somewhere near zero so it says point two now the reason why it's showing 0.2
is because in these leads right here you also have resistance so it's not a true
flow of electrons with no resistance through your wires so there's a little
bit of resistance in there so we're just going to take on and take the two leads
on this resistor right here now we got 54.9 km/h on there and i'm
going to use on the next demonstration and this one is two hundred and sixteen
point seven now that's approximate because this is a 220 ohm resistor right
here now I want to show you a different kind of test lead on here and these just
plug right into your normal probes and these are for
I use these on circuit boards and other things that you can see the little hook
in there now I'm going to hook this side of the resistor and this side of the
resistor so I don't have to hold it and we'll just bring it up to the homes and
54.7 kales all right on that probe we'll bring this
one on this probe you don't have to hold it two hundred sixteen point seven so
these are very useful tools to add on to your probe put my battery in a little
holder so I have a little connector here my little power source right here with
the 9-volt batteries hooked up to the led I'm going to break the circuit right
here and that's what we have to do we have to put the ammeter in the circuit
otherwise it will not read so we have it there and we'll put the other lead right
here excuse me for being a little bit sloppy here and we'll turn this on and
it shows up point zero two eight all right now that's on 220 ohm resistor
we're getting two lessons here how to use the ammeter and a little lesson line
Ohm's law okay now I'm going to increase the resistance going to a 270 ohm
resistor and that's going to drop down to 0.02 for so that's like 24 milliamps
that's all we have for this demonstration of the multimeter I'll
have another one later on maybe in a couple of weeks to go a little bit
further into detail on this if you would like to see more videos like this go
ahead and hit that subscribe button and while you're at it
do the bell and that will notify you whenever I have a new video coming out
and if you would like to support this channel go on over to my patreon page
patreon.com/tomkvichak

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