What’s an OSCILLOSCOPE?

hi I've been giving away tons of oscilloscopes thanks to keysight I assumed everyone knows what they are watching my videos but then I have my friends asking hey what were you showing in that clip Oh see I showed on my oscilloscope that on your white Arsena you know that screamed with the wiggling huh why do we even watch my videos then your pants were on fire man so I'm here to show you what an oscilloscope or scope for short is you have probably seen one of these called a multimeter this one measures resistance diode stuff continuity capacitance inductance transistor stuff temperature current frequency counter voltage I guess that's it and you can get one of these for around $50 in contrast an oscilloscope measures voltage yeah that's it and you can get one for a few hundreds or thousands of dollars now if you find yourself saying that Wow that's a no-brainer I'll get one of these that does much more for less then go ahead and slap yourself across the face on both cheeks of course a multimeter is a very useful device that among its functions can measure DC and AC RMS for voltage and current but this can single-handedly show you the deepest secrets of electronics it teaches you electronics like nothing else can it shows you how every component works you can see every single electron well not that far but you get the idea the amount of information and insights this thing provides by only measuring voltage is incredible that's why thanks to keysight I'll give away 6 more of these babies at the end I think they've helped me give away around 50 scopes so far and that's on top of their keysight wave events they hold every fear come on I said fiscal year they are giving away over hundred pieces of different test year every single weekday from March 2nd to 13th so don't miss this they gave me a link to use in the description that not only you enter for my giveaway but also instead of one you get two entries to dare you wrong so if you really like to learn electronics you need this chance and it's free I've set fiscal now let me show you what it does using a probe it measures the voltage between two points like across a battery between the scope ground which is this clip and the tip of the probe the signal then travels through a coaxial cable to what's typically a BNC connector that plugs into the scope the tip of the probe can be described that you can grab a wire with like this or you can remove it and use this tip to probe different spots of the circuit this ring around the tip is ground so you can also remove this wire and put this special thing on and using this you can probe across a very short distance this shrinks this loop that significantly reduces the electromagnetic noise picked up by your probe in your measurements imagine if the voltage was changing in time and you could measure it every second you could plot a change of voltage in time and understand the behavior of the circuit and that's what a typical scope does it plots the voltage change in time and not just every one second it can be every nanosecond these things can be incredibly fast like this one is two giga samples per second the vertical axis is the voltage level you can adjust its scale using a knob and the horizontal axis is for time that you can adjust its scale using the other knob this can tell you tons about what you're measuring for example if I measure the outlet voltage never handle live voltage I'm a professional I didn't know with this wire which one was live but I just figured it out and this one is the live wire see the scope ground is connected to earth through the power cord that is eventually shorted to the neutral so if I accidentally connect this cope ground to the live wire I short the power lines there's a simple solution like this adapter that we can use to bypass the earth prong that is the scope ground this way I can connect scope ground even to livewire and probe the other line and it wouldn't make any difference because it's a sine wave now you would think the sine wave would look clean but not quite it is a bit distorted due to the uneven current draw from all the instruments plugged into it especially this flattened area on the peaks that is an effect of all the full bridge rectifiers plugged into the power lines the circuit looks like this let me explain making the scope ground floating and connecting into livewire means that all the exposed scope grounds like these BNC connectors are now exposed live wires that can shock you guess connecting the scope to earth is safer but then I remember in some countries like Japan they don't even have earth on their outlets actually let me conclude by the fact that they use the same North American plugs without the ground at 100 volt AC sounds like the bare minimum how do they make sure these exposed grounds are not accidentally live wires I guess they could use isolating transformers but very inconvenient leave a comment if you know anyway here we have a full bridge rectifier and two probes one to measure the input and the other one to measure the output god dammit like I said earlier a scope has a single ground and so all the probe grounds are shorted together so you cannot probe across two points of the circuit with one probe and across two completely different points with another probe because the grounds will short them together and that's where differential probes like this come in they isolate between the scope ground and the two points that are connected to so you can measure between any two points in the circuit regardless of where the ground is this one is a bit too big because it's high-voltage there are fancy low voltage differential probes too and unlike these ones differential probes are not passive and need to be powered and the fancy ones are powered through their fancy scope connectors so here's how I will prove the rectifier circuit one passive probe across the power lines another passive probe across a contrast or to check the current going through the powerlines and one differential probe to check the output voltage of course I can do this because I have a 4 channel scope rather than to here's the circuit let's see if it blows out first okay oh look at my resistor is lighting up like a lamp I guess I could use a lamp as the load okay the circuit is all propped up and I'm using a light as the load you see yellow is the input line voltage the light blue is the replay output DC voltage and the spiky green is the current draw from the power lines you see the rectifier circuit only draws current from the power line and loads it at the peaks of the sine wave and that's why it distorts the AC sine wave and makes it flat at the top like I showed finally probe something so there things you can see with a scope and these are just some of the basic functions of a typical scope these digital storage scopes take it to a whole other level this supposedly entering level scope is higher end than anything I've ever had see the scope has its own 20 megahertz function generator that can create many different waveforms and the scope can use this function to find out the frequency response of your analog circuit here I have a simple RC circuit wired up to the scope and I run the analysis the scope sweeps the frequency input and looks at the output voltage level and plots the frequency response of the circuit here blue is the magnitude and pink is the face you can use this information to analyze your circuit like calculate the capacitance or find parasitic components in your circuits find usable frequencies or compensate your circuits properly or adjust your gains as you wish so what I'm saying is that a good oscilloscope can change your electronic life now here's a lightning round of information a scope can measure up to its maximum frequency accurately and also up to the frequency band of its probe written on it so if you use a low frequency probe on a high frequency scope or vice versa the lower frequency band is your limit and the higher one is wasted a passive probe has a one time or ten times attenuation switch one time gives you a larger signal what ten times attenuation has a higher bandwidth that helps you get the full band of the probe and more accurate representation of signal awesome for proper probe frequency response on ten times attenuation you have to probe scopes reference signal and using the provided screwdriver adjust the probe filtering circuit to get square waves otherwise wasted if you don't have a differential probe you can use two probes to measure both sides of your component and then subtract them in math function to get the voltage across the component or other map functions the trigger function is essential to keep a steady oscillating waveform on the screen because the scope will always start plotting the wave when the wave hits a certain voltage otherwise the signal will look like use a choir function to see your wave normal peak detect or average or high resolution to clean it up beauty really the life of an electrical engineer or hobbyist would be wasted without a scope it would be extremely hard and very time-consuming to design and troubleshoot a circuit for us this is the gateway to heaven no scope is like no phone and internet and trying to contact your friends to throw a party it's like Dark Ages and there are tons more you can do with a digital scope like this keysight one also has a large capture memory so you can have a zoom function it has a built-in digital voltmeter digital and analog bas analysis and more I know scopes are more expensive than many of us can afford that's why keysight Wave event is a super great chance to get a great tool for free and that's on top of the six scopes i'll give away one goes to a school two to my patrons at patreon.com and three to the viewers gave away just sign up from my link in the description and you'll be in my drawer of three scopes for the viewers as well as keysight waves draw for over hundred more tools patrons are always automatically in their draw and they can ask me questions and stuff and schools can enter from another link in the description my link is different in that it gives you two entries two key sites draw compared to their regular link so use it every weekday during their events they give away five of these and five digital multimeters and then Monday to Thursday they give away one of the even fancier equipments worth up to fifteen thousand dollars and on Fridays they give God Almighty of all equipment's worth up to $50,000 and if that's not enough they'll give away five more tools when their YouTube channel keysight labs that provides great information around test gears it's hundred thousand subscribers I don't know man I hope they can keep this up it's like Christmas for electronics good luck to everyone

Channel: ElectroBOOM

Views: 997,643

Rating: 4.9536595 out of 5

Keywords: educational, electrical, ElectroBOOM, science, electronics, engineering, entertainment, equipment, measurement, experiment, mehdi, mehdi sadaghdar, arc, mishap, physics, Sadaghdar, test, tools, circuit, funny, learn, shock, spark, discharge, Keysight, Keysight wave 2020, oscilloscope, scope, Full Bridge Rectifier, rectifier, probe, compensation

Id: DgYGRtkd9Vs

Length: 11min 48sec (708 seconds)

Published: Mon Mar 02 2020

Reddit Comments

[u/TurnbullFL]

Scopes with one side of the inputs earthed is a stupid legacy that should have ended years ago.

I'm waiting for a scope with built in isolated differential probes on all 4 inputs.

[u/pppjurac]

great! thnx for video