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How to use an oscilloscope / What is an oscilloscope / Oscilloscope tutorial

T T T hey youtube is welcome to the session
where we haven’t game to you have a little tutorial on how to use an
oscilloscope an now I want to do you passed before we
get into doing he needs to learn how to use is a Skype is perhaps just explain a little bit
about what it’s used for and how it works now so the one well it’s trying to
illustrate this is and how it actually takes
measurements and how what a brilliant little device
that is and if you can imagine this piece a
paper as you can see there’s little dots in
the piece of paper now let’s pretend that’s a particular measurement bandy at a
point in time a cat and and we pretend we taking these
even with a multimeter if we kinda look back to
see you there you go I’ve got another particular
measurement being taken there’s another one being taken another one being taken yet another and another and another at if we join all those measurements %ah
as an oscilloscope that’s what you get is although his measurements being
chased overtime and in essence that’s exactly
how the old analog and oscilloscopes work the hat measurement which kind and they
use those old cafe CRT cheap scatter rate sheeps and it’d also the beam all the trace as it would call as it got a signal and
because if your persistence of vision you I it would ashey drawl trace and join the
dots will join the individual measurements across the screen and that’s in essence
how the original oscilloscopes works worked
although it’s all see different stay with digital ones they just had the
signal mousy plotted on a digital display bill in essence
what highlights the cuban missile it’s got is
is a time machine it in it really is a time machine it
allows you to see something over a period of time
something that’s your normal multimeter cont’d in this is your multimeter if you can
picture this is the ice cream your multimeter not a single
slather a little slut window to look at a pic
particular measurement and if that measurement happens to be
changing can NEC instantaneous value of x management
changing a multimeter is great if you go to a
value which is reasonably constant and not changing
much overtime cousin you can see it instantaneously but if you’ve got a mission that’s
changing over time I E an electronic signal that doesn’t
help you what you need to do is brought in the window see see the whole picture over a period
of time and that’s exactly what this Eliska us
it’s a time machine for electronics specialists that a close
look okay so we have our Cisco find out and switched on and we’ve got a
signal that’s coming through on it and we’ve got all these knobs and
buttons not happy so what ru it does all this mean more
the bits on the display and how do we use a the buttons and knobs to actually and
play with a signal so we can understand more about it well let’s have a look at some theory an
AE but if the diagram and then we’ll get back to you and in
practice actually turning the knob on on this has got to see how that works
right so let’s just cover of Waterloo 3c am on the display and how that actual
display works for us now then be too worried about the
economy images what I’ve got on this display
will cover that’s in a moment but less just this will kind of look at the
matrix of lines on this telescope display not for me the probably the first two French ain’t
important thing as I mentioned in the slot time machine or so the Skype
is the fact that’s you can represent time
by this by the and horizontal line all the
x-axis going along here so on this seller Skype
to make it easy to understand your time base with a timescale they’ve
broken at into little segments and these
unwanted this scale however he is all see one of
the things that you can it adjust with the knobs and buttons on
your so let’s go not generally as a scopes they can be
broken update to its size the matrix conduct so I’ve got a matrix here of 10 by 10 s instead divisions and that’s how to call them so there’s
ten divisions gang optimist ten divisions I going along their horizontal line cap now that’s not an issue time pace and
when you say it’s your oscilloscope you can see it what that
time by should be all it can be automatically selected for
you of secret you might not know the best time frame to view as: a signal and as I’ve highlighted up to an example
I’m gonna show you each other’s little squares is that
division and so for instance on your so the scope
you may have it said to you a setting all am 500 microseconds and that is that is a
representation up each all those little sec there’s little
segments now if you gots it do you happen to have
a set at $500 microseconds then an essential full-scale reading and
when I say full-scale your whole time by secchi showing in that scream would work out to be I’ll see ten times at which would be
five milliseconds special horizontal x-axis and then we
get to the BRIT School axis or the y-axis which is an
indication all the signal level all in for the most part on the sill scuff said
is the voltage the voltage level of your signal and again it’s divided up into you individual
little divisions and each of those you can set with a
knob and today’s particular value and in the
example that we can’t have a look at week each of those divisions is set to
one bolt one bolt pair division which means the whole screen shows a total value of happens to be ten times as divisions
which would be equal to 10 volts celeste is something to understand is
that your your y axis or your your vertical axis is the signal level in a voltage level and Joe x-axis is your time okay so this quick to show you what that
looks like on an actual oscilloscope itself with the signal and again before we get into that what I
want to show is of serious importance. component to the oscilloscope is the
actual pro and a safe is not interest in this video
and and again you need if you want to show interest in this
video then you need to rate it with a thumbs up and I’ll follow up with her another
video we get into kind of setting this Ascutney more more advanced features but you
oscilloscope probe is we gonna pick up your signal and this
is a list of patents have two channels I’m just using one channel which means
we can actually view two signals at the same time your private which it connects on to you
the signal you’re measuring and then you have another lead which is
an in essence the ground lead for the signal so I’ve got these
connected to a reference signal which you can use to calibrate and your probes with what have you but it makes a nice easy sample signal
on the actual Skype itself so what I want to represent
is what you’ve just chatted about is that whole matrix that she have on your display my sis got is a 10 by 10 as I recall is days 8 divisions I going
up pretty representing the signal level or the voltage and then mine has far more across the the time access essay which I really
likes allows me if I’ve got a slow sync them signal I can I’ve got more time to
actually view the signal and as you can see here on
the display it’s Shane the actual time third
division along the x-axis as 500 microseconds and we’ve got a square wave represented
here and the you can see a says channel one and it’s got one one bolt and that isn’t this is one bolt who
division each one of these so that is a X shows exactly the breakdown of the display so let’s
move on to the next bit scientists have it look at the
potentially the types of signals which you can have coming in on your cell a Skype and how
potentially that they would be represented and this of course you there are thousands times
a signal that you can get to view but let’s have a look at a few now the
one I want to point out was something which a digital multimeter can represent very nicely is a signal and is certain
voltage level that stays the same and on oscilloscope that’s still a signal but it’s going to
be represented by a straight line as this red line represents here say O
level stays the same it’s not changing over time it’s just going to be a straight line if you had to connect you all a your
Cisco up to let’s say if you could connect up to mains electricity safely an and you’re looking at the signal of the AC you’d see a sinusoidal way appearing on your Skype so be something I’ve been going positive and then coming down negative now
something else to highlight is edgy have a common middle line on your cell is Cup which in essence
route represents your comments 0 fault line Sir Bob will
be positive below would be negative but it’s also a relative because you can
make adjustments to pull a signal into your your friend move you
within the display and then make measurements so it you
don’t necessarily have to worry about that being I am the negative or your the zero
line because you couldn’t count the divisions
when you want to take and measurements on a signal but this
would all see represents like an I’ll train team or sinusoidal I S signal that’s coming up and down we have came
greenup got showing a square wave pattern which might be a digital outputs from some kinda device it could be and a signal from a a pulse
width modulated device like a a solar charge controller which is sending a square wave pulse
width modulation to actually charge something then I V share what i’m saying is you
could let’s say we hope this up to thank pastor that was charging overtime and as you connected the
capacity had a battery or by will power supply attached if the sexual time by slower not or even
if things are happening fast you might see a signal like this where
the voltages initially on a charge voltage is initially let on York pastor and then his last start holding
up overtime and that would pass be the trestle the
signal representation you would actually get on the screen in that case right side is gone and
disconnect to the probes from the conduct test signal and iconic connect connected them to a
9-volt battery and if we have a closer look at the
display in this case you can see I don’t have a signal on the
display because I haven’t posted yet what a patent to go and find the signal and the problem is that that the the
voltage from the battery as set the level of the signal that split out to the display and
there’s no indication that on mine oscilloscope you got this little
arrow which at points that the signal might be sitting
higher up so this is where it leads into two things is me showing you what that
signal looks like and then using the batons or knobs to
actually bring signals interview so what I’m doing now I’m using the vertical position back
room which will discuss now to bring that signal down so that we can have a look at it and as I showed you on that’s at diagram this is what a at I multimeter would
perfectly represents as a reading if you put it across at
Battery two straight line because the values not changing says some PS straight race across the
screen now as I bring it down what I want you
to you what you see is the on CNN’s a bowls position and it’s showing negative
because in essence the am zero point is being moved down because I’m adjusting the vertical scale save up put it on where the 0 used to be you can see and actually shows a reading
of minus seven points something bolts and that in essence is the reading of
the battery it’s just over seven balls and a week I i’ve made the adjustment to
actually bring into the so let’s have a quick close look acts as
someone the adjustment you can do on a oscilloscope rights so once we have a
signal which and we in putting into Osisko we probably want to go and have a close
look at it and play around on the screen and the
reason for doing is that you you probably either want to take
measurements of the signal to understand and the voltage or have a look at if
there’s any noise on a signal what had he and bill to do that get a closer look and play around with the signal we have
certain knobs weaken it just the parameters of what we seeing on the
screen and that signal to make it easier to analyze so goes to I want it just means that basic
adjustments that we have on on an oscilloscope so the one the first
knob and which actually saw me playing with
their is a political position NOP and that is per channel so each
channel if you have several signals coming into your soul a
Skype each of those I’m channels will have its own vertical
position knob and what that allows you to do is merely
without changing the scale of the signal is to position it up or down because
depending what scale you sets for your soul a Skype it might be
out to the range of the display said she saw a hat that signal and from battery I had to put it down side was in
range of the display and of the measurement values which I
were pre-selected said I could see it and that said
vertical position not very very simple to use it can get
confusing sometimes when you have a signal a mixed city catches me often when a signal is outlive you need
to know whether it’s at the top to the bottom you just knew just you can see it but they all show you there’s a often up
or discussed so disgusting we haven’t automatic baton which will automatically
pull a signal interview so that you can make your
adjustments from there if you’re a little too lost then you have and no which changes
you a horizontal position and again that goes for all channels so that you can move your signaler
around on the horizontal kinda time axis and so that you can view a certain part
of it your signal may not be symmetrical at
may not be and I square wave and you might want to see a particular
part ovett all and we’ll get down to the scale you
may have changed the scale of the signal and you’re only seeing a small party you
signal and you need pullbacks interview and
that’s what that horror horizontal position all allows you to do the next thing then is the voltage
scaling this is wat kinda gets more interesting so this is where I mention you can adjust your balls per
division so each one the squares you turn you
turn that knob and you can change adjust that scale and in essence what
that does it’s like a zoom feature so it’s allying
you a closer view over a particular parts that the signal
send essence it lets as an example the sinus alway if
you change the scale at which you doing this you could in essence zoom in senate only the top part of the
signal was was in the display see had a zoom
view and that is by literally changing both the the voltage scale and he even
the time base and that’s the next not is your time
base an actual seconds per division of Si O no x-axis you can change the
amount of time that you want displayed in your script scream so do you need
more time to see more the signal or do you want to just it for less time
CC’ing a smaller parts at the the signal in
essence already me to just to fill in to show whole period of the way a complete cycle of away and that’s what
that allows you to do then another interesting and importance
adjustment is your trigger position an actual position as something with my
demonstrate now you can adjust that so that it basically state gives you a
stable view of your signal coming in your signal
might not necessarily be a clean one which is being displayed in the same position
of your display the whole time and that can be rather difficult to
evaluate and have a look at a signal if you want to keep it live if
it’s jetting around and moving around so what your trigger dies is you then set a level which you want
your scope I to capture that signal and it suggests
it down on your current voltage division you you move your trigger downs con up the
middle points for your signal and the on other variables which I’m not
going to hear we can have it edge triggered all all leading edge all lacking edge
triggered or what have you but you set that trigger point certain
essence to waive is formed hopefully and a constant view see get a nice stable view I’ll be aware
that isn’t moving around all over the place and that should
trigger position and that guys for all channels and that
you’ll see is something that you just on the side here to the middle of your
way so let’s have a look at those little bits and pieces by to the first thing I’m going to
demonstrate as we look at the signal here is the if you can notes even know this
is a stable wave and that’s coming in from the kinda that the signal source on the and
oscilloscope its jumping around a little bit but now
you can have a signal really jump around a lot more than that
so there’s a a trigger points which can be set and to
stabilize and if you set in the right place it paldon stable I S the way it’s over
here on this is so let’s get there’s a battle over here or not I should say which it turned out
as you can see on the display there’s a line which thing comes down as I move back down so the trigger point
is right in the signal you can see how you get a nice stable
way for on the oscilloscope then if we look at
the positioning and I can all see move the
signal down I’m a wants to have that signal down and in the display at a middle point
because that’s where I want to take some readings and that’s where this vertical position
of then helps me move it I could move it so
that’d it sits nicely on on these divisions I can’t make measurements you do you have the facility again and
it would be something I can show you in the a second or more advanced and tutorial
on oscilloscopes where you’ve got tools to help you make
measurements but what you can do is position your signal with this in in place that you can
easily Council part easily take measurements of your signal so I could put it up
online I will put up on my baseline and weekend and we know that we’ve got
one bowl third division and week out the
divisions 123 we know then that out the ass signal hi
to the signal is in essence at three bolts we can also see from the
timescale Andrew here we may have this is where we
end up playing with the horizontal baton is to position the wave to you think it
into your a a position which is easier for us to
do you and on the horizontal scale to make measurements so you can put it exactly
on the divisions and we know that how r our time the
division is 500 I microseconds so if we want to understand that period and appeared is a cyclone one-way form
so from starts here there’s one to divisions before we get a complete
cycle of the way from let’s say I A a lacking age to
another lagging age and two times your 500
microseconds will be one millisecond so that period of the sink signal is one
millisecond and that can be deduced from literally
doing that measurement on the display their rights and now you may want to have a
closer look at the signal and then we can refer to you a new
horizontal ask and which is your time base we can
use a knotted adjust the time bias said you keep an
eye on the at time scale at the moment of 500
microseconds over here as i turn the snob you gonna see that’s
gonna change so I’m in essence decreasing the amount
of time that was showing in the screen and then in essence zooming in on the
signal said he see as I just that I can then get a closer look at that
signal as we go in and as I but listen to the
the time frame on the screen likewise I can do the upset if I get
back to where we were 500 I can increase the amount of time that
we we sinker division or right across the screen and then I can see more the signal so as you gotta out it may just look
like a lot of noise but that’s the beauty of RCA having an
oscilloscope you can then have a closer look at a signal and see how it’s made up on what’s going
on on your input signal so that’s your and your time base you can adjust and
obviously you got short vertical scale or your
voltage scare which you can adjust on on the nobody here and as I did just
that I can adjust it so that I’m showing to
all a division you can see that adjustment here and in essence as you can see and its acting like and that zoom function say if I i signal with with a I’d be get and voltage level I could upset just set
to put into to the display that way and again I can
take it back up so that’s and I can see in essence zoom in and and crates and get a different view of the actual
way and it just or signals of different bearing voltage signals voltage levels that come
in to display right so before in this tutorial what
I’d do xoxo to show you again one of my favorite things which I like using hence
the scope formats for showing a measurement overtime up let’s say
something like a hybrid all souped pastor being charged up so I’ve got mine
variable power supply said with a voltage on a current setting
which I’m going to apply it to at the pastor and I want to see overtime what’s that buildup is like now the oscilloscope is in a kinda scan
mode is not being triggered by a high-frequency signal coming in a sec got my time base said to one second per division so I can show quite a few seconds you can
actually see this can go across how slowly goes across and I’ve got it said 21 one bolt so my I’m my references said to the zero
line says it can see I’m just we just under one bolts of charge in the pass to karaoke if I can change the time-based on the a.m. scope you can actually see if I
change it up to you hoffa second pair division hot scans
foster and about change it like they have got
it 2.5 seconds per division it go slower so I’m not gonna switch on
the my am they’ll pass apply and this slowly applying a voltage to
you back that pastor and you can see what’s happening a great
deal in the amount of time that online on on
the screen but it by going it’s a reduced that time to let’s say 10 seconds to division then all kinda slow representation of what’s happening on
that on the charge stems that high-risk
pastor now time-lapse this so that it we’re not
showing up too much time doing it but you’ll get an
idea of what you can do by just changing
those making those adjustments I you can fit you can set the parameters
for your display for the signal that you’re trying to
view at ultimately what you doing with those adjustments says you can see not much I couldn’t represent much because my
balls per division was was not really fine enough to see the
climb in the Charente rate on their so what we gonna do you i mean a change
that scale to something that small fine so that I
we can have a better representation what’s happening now because I change that scale I need
to just the signal but key downside I get into the screen again so I can see what’s going on i’m open at
the house I get it down to the the baseline I’m gets to remove the charge from a
pastor and then we’ll start again my case %uh from you something that
charge from the pastor and as you can see about the
trace and shit representing the currents that
voltage level in the pastor a mess something a little bit
high so I’m gonna and I just sat down said I get it to the
center line so I’ve got more room for movement as it charges up and as you can see I
i’ve adjusted the volts per division 2 200 million volts
this time saw I should in theory I’ve got a far more
sense to have been far more granular and scale on the why skeletal the
multiscale Sasha so stock see things building as I apply at
the charge from the variable at Step all the variable power supply so
let’s just switch that on and see what happens and there you go you can see quite
clearly see a better representation what’s happening as a charge is actually building up neck
pastor and by making those adjustments on the beer snobs to change the scale means I get a better view or what’s
happening overtime set up to make more sense to so there you go changes now down to two hundred million
volts per division and again it just allows you that’s a granularity text you see what’s
happening with i signal in this class it’s also very slow low-frequency signal and but having that capability of those
adjustments then you can change the parameters to suit your
signal and what you want to see from your signal so they would have actually just
switched off the I’m charge from the variable power
supply you can see it actually show there’s a
nice linear progression of growth of charge in week pastor and as I switched it off
you can see the sudden drop and then the slow discharge over
there ok and the last thing I thought I just leave you with this is to show you
another feature which we can explore for that and and in the next series on this is
capturing a signal and so for analysis if
something’s happening very quickly you may want to capture their little
impulse a little signal and then analyze it so what I’ve got is
%uh got a lot a stack passover lot smaller value it’s only 10
micro farad have got hooked up to my available power
supply so with that rather noisy signal from the past five think and such a trigger point so I can catch a piece of that signal watchin able to
do you use once you’ve actually captured that signal as you can then go and change your time
by its annual your fault her division said you can go
and have a closer look at that captured signal and share
depends on the amount of buffer storage that your oscilloscope has and there’s little graphic
representation at the top as to what you can do or how much of the
way the got that you can go and play with it and have a closer look at that signal
okay so I hope you can somebody from that exercise its recipes for learning curve for me as I
don’t make much use to the Selous Scouts I’m kinda be my piece along the way as well
and if you if someone happens notice if i made any
mistakes or a reason that please post a comment because then all you than a ten
thousand pick up on the eyes as said if you do want see more in the
series in the way all know you want to a in this series is by writing the
videos with a thumbs up and then I’ll jump into something more a
features and functionality of missus cut because they it’s a really our lives and
it’s a really useful tool site thanks very much watching do
subscribe if you enjoy this series had I’ll catch the next one years T

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