Everything you need to know when buying/using an Oscilloscope! EB#49

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You can get a decent (4 channel, low cost) scope here (affiliate links):
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s.click.aliexpress.com/e/_Aqd2VG
You can get a differential probe here (affiliate links):
amzn.to/3AQdFzq
s.click.aliexpress.com/e/_9IoEt4
Websites which were shown in the video:
www.batronix.com/shop/oscillo...
www.batronix.com/shop/oscillo...
www.batronix.com/shop/oscillo...
www.batronix.com/shop/oscillo...
In this electronics basics episode we will be having a look at the biggest mistake you can do when working with an oscilloscope. But I will not only show you how to do safe mains voltage measurements but also show you all the basics when it comes to oscilloscopes. That means I will show you how to choose one, how to do simple voltage and current measurements and finally how FFT works. I will explain passive probes, triggering, voltage & time division, measuring functions, the cursor function, AC & DC coupling and single mode capturing. Let's get started!
Thanks to Brilliant.org for sponsoring this video.
Music:
2011 Lookalike by Bartlebeats
0:00 The big mistake when using an oscilloscope
1:08 Intro
2:02 How to choose a scope?
4:44 Passive probes & scaling factor
5:55 Trigger
6:41 Voltage division
7:11 Time division
7:37 Measure function
7:47 Cursor function
8:19 AC & DC coupling
9:08 Single mode capturing
9:36 Current measurement
10:16 Safe mains voltage measurement
11:37 Differential probe
11:52 Math & FFT

[@greatscottlab]

Here are some things I would like to add to the video: 1. I do not want to shame low cost scopes in this video. I started with a 2 channel one from Rigol and it worked perfectly fine. Over the years though I noticed that 4 channel scopes are the way to go. And I also only got such expensive Keysight scopes since they gave them to me for free in order to support my work. So in a nutshell, you can start with a low cost scope just fine! 2. I heard that people would just insulate the PE connector when powering the scope in order to measure mains AC voltage. This is a TERRIBLE idea. This way you connect a possibly very high voltage to the BNC connectors. If you touch that, you have a problem because you can be partly or completely connected to PE. Only use a differential probe for that or use two scope channels and use the math function in order to calculate the difference between them. Thanks for reading ;-)

[@username8459]

The second addition definately sounds like Electroboom :D Though he uses a differential probe in some of his videos.

[@xistencestudios8904]

I recommend something like an Owon VDS1022 for the bare minimum oscilloscope, a Hantek DSO2xxx series for the cheapest standalone scope with a function gen

[@VijayaLakshmi19807]

Hi sir. Sir please hack an AR glasses to work on a HDMI input even if the whole setup becomes bulkey. Bigg fan. Love from India ❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️

[@rsattahip]

Thanks, what about an isolation transformer to keep your scope and circuit safe?

[@marekaksmu]

What about using a separating transformator for powering osciloscope? I hope I translated it fine :) it can be usefull aswell ?

[@yeyee2418]

I was pretty sure something was gonna blow up on the intro, but quickly realize this is not electroBOOM. Great video as always sir!

[@greatscottlab]

Something did blow up while filming......but the camera was not rolling....too bad

[@joshm264]

Same, i was expecting "let's hook it up... SH****"

[@MohitSharmaxp]

@@greatscottlab 4:55 you did blow something I guess

[@eswing2153]

“Definitely not going to talk about why I only have three probes and unmatching tips.”

[@alejandroalzatesanchez]

*FULL BRIDGE RECTIFIER!!*

[@Kevin-jz9bg]

Greatscott: Let's hook it up and.... thank god, nothing blows up. Electroboom: Let's plug it in and... Wow, nothing blew up, that's surprising. Oh wait, I forgot the turn on the power strip. (flicks switch) BANG

[@bunny1033]

I was going tell that too

[@YTshashmeera]

I remember that video lol

[@Antagon666]

You don't mess with 230V. 120V is at least relatively safe.

[@TechGorilla1987]

I love the fact that your hand computer (aka writing instrument) is permanently set to bold text. Your ability to accurately trace over your writing with your markers is legendary.

[@takatamiyagawa5688]

He needs a thicker pen.

[@breezetixhv]

years of doing that

[@Darkshadow799]

I learned more in this 12 minutes than in 8 hours of my electric measurements course. Good job

[@greatscottlab]

Thanks mate :-)

[@tvishmaychoudhary69]

Mehdi from electroboom didnt explained that much Happy that you did it 😀

[@greatscottlab]

Yep, it is an important subject. I am glad I can finally cross it off my to do list :-)

[@shkhamd]

EEVblog has a video that goes into even more detail

[@kenmore01]

As a long time SMPS engineer, I can tell you, NEVER isolate the scope or defeat the PE ground on it! You can isolate the power supply (device under test or D.U.T.) with a 1:1 isolation power transformer, or my old fave for use when I don't have access to one is to use two scope channels. Connect just the probe tips (unclip your ground wires from the probes so they don't touch anything by accident), and use "invert and add." That works well for low to moderate frequencies. If you must measure higher frequencies, connect both grounding clips to an "X" capacitor (rated for across the line) of around 0.1uF or so and connect the other end of that cap to the D.U.T. electrical power supply ground, though that is the least preferred method. The most preferred is the power isolation transformer to isolate the supply. It makes it safer in case you touch it too.

[@oliverm1255]

what's wrong with isolating the scope ground

[@kenmore01]

@@oliverm1255 It creates an entire oscilloscope's worth of dangerous high voltage you you or anyone to touch.

[@MrOlezhandr]

I specifically bought a battery-powered oscilloscope, as I burned more than one microcircuit until I figured out that the matter was in the earth connections. But now I ordered an isolation transformer)

[@kenmore01]

@@MrOlezhandr Awesome! The life you save may be your own, or your kid's.

[@joeshmoe7899]

Why not just use a gfci, instead of an isolation transformer?

[@brianmendell1449]

Hey Scott I've been watching your videos for a couple of months. Man I just have to say thanks man for helping me learn a new trade after I was hit with a stray bullet 7 years ago. Learning how to chase down my electronic demons lol has now through your videos helped me help other people in my area with their mobility scooters or wheel chairs. So thanks and keep up the great content and I'll keep watching.. 👨‍🦼

[@jackwilliams2010]

Great tips! When I took an electronics course the instructors wouldn't let us touch the oscilloscopes until our second year. And then there were several reminders not to touch the leads to any of the board's powered by the mains unless you were on the other side of a transformer.

[@adisharr]

I appreciate your multi-color sketches as you present the topic. Always very well done! Very easy to listen to and educational :)

[@jimvonmoon]

After watching this video I am more afraid to try out my oscilloscope than I was before. It just made me realize how little I know about electronics. Now I need to find a more in-depth and more beginner-friendly tutorial.

[@montecri]

Please don't be. If you're into building IoT stuff (Arduino, stm32, etc) you're mostly safe; just be aware when powering your boards through a computer USB port since some of them will connect USB gnd to mains ground. I almost always use a power bank for that. Physical isolation is good.

[@mernok2001]

@@montecri USB connected to mains ground is not a problem.Its only a problem when you measure a full bridge rectifier with your scope probe.

[@Archnemesis88]

Great video, I recently picked up a 2 channel scope as an upgrade over my DIY oscilloscope kit, can't wait till I can upgrade to something much fancier! You dropped some great tips in this video 👍

[@Meowface.]

This is one of those tools I’ll buy first and find a use for later

[@nirbhay.8400k]

THE best video for beginners! You are a life saver dude! Perfect and clear explanations.

[@Music_Engineering]

This is such a great video! I am a TA and will definitely recommend this video to new students 😊

[@varunrmallya5369]

Sir, could you make a series teaching us about the features of an oscilloscope and wave forms observed in electronics. Would be really helpful

[@nikolaiorr8383]

Thanks for the explanation, I've wanted to get a scope for some years now but haven't due to costs and not knowing how to use one. This video also explains them in a simpler way than others have done.

[@TotalWarChronicles]

Really good video Scott! It is nice a nice change to have a video that is less complicated!

[@DoDo-is7yb]

Great video! For the basics I would add to adj. the cap in the probe for a correct square wave.

[@Abodino]

I was thinking about buying an oscilloscope and finally got a great video about oscilloscopes... THANKS!!!

[@stevetobias4890]

Great video Scott, I am still learning my way around my beginner Siglent SDS 1102DL+ scope. It has come in handy a couple of times but I need to learn more.

[@peerappel2012]

The input and output of differential probes are actually usually not isolated, it's just a resistive voltage divider (the 4.5Meg measured in the video) that reduces the voltage on the input that enables measurement of high (common mode) voltages.

[@iMakeFunnier]

Been waiting for a video like this for a long time. Thank you very much. This is very informative for those of us without electronics backgrounds.

[@greatscottlab]

Glad it was helpful!

[@Salfke]

Great video, you teach simple steps of using a scope in 12 minutes better then all the other videos I have seen. nice and easy.

[@greatscottlab]

Glad you liked it!

[@anthonymina8398]

You are my inspiration on why I chose Electronics Engineering for my college degree. Thank you, sir. Starting my class in a week. Wish me luck!

[@fseeletronicos]

Be prepared for the integrals.

[@BobBeatski71]

Nice refresher. 👍

[@mattwillis3219]

Essential viewing for anyone venturing into the domain of power electronics, quality education as always GreatScott!

[@greatscottlab]

Thanks mate :-)

[@xConundrumx]

2 more options... 1. Use a separation transformer to power the device under test. 2. Use a handheld (or battery powered scope)

[@mvv175]

Thank you for making this type of videos they are so informative

[@greatscottlab]

Glad you like them!

[@amnesie6615]

I love this basic / beginner videos! Danke!

[@greatscottlab]

Glad you like them!

[@huseynmashadiyev5435]

I have fast reaction to pause the video, when someone says: "Let's hook it up", I guess ElectroBoom's mental traces are visible :D

[@Kevin-jz9bg]

LOLL I thought the same thing

[@fullwaverecked]

Being financially challenged has one silver lining; every bit of test kit I own will make a good repair video... Thank you for the scope tips! Very broad in scope. Cheers!

[@michaelclark2131]

Awsone. You helped me purchase a scope. Simple concise. Excellent !!!!!!

[@getcartercarpark.]

I love the exclamation at the beginning of the video when you plug the homemade switch mode PSU into the mains AC!!!!!

[@adolfos1991]

Thank you so much for this valuable video!!

[@sairfan06]

Thanks Scott for the video, now a days most people are reviewing the scopes and this video was most wanted where you are explaining how to use a scope, i hope you will do more videos on this topic, if you could use Siglent or Rigol that would be great as most of hobbyist are using these brands, as they are target audience of these videos that will greatly help.

[@mohinderkaur6671]

kaboom! had my table catch on fire thanks

[@jasonbrown467]

i just got a scope for christmas and have no idea what i am doing. this is by far the best video for beginners i have seen so far. all the other vides assume we know the basics

[@harsimransinghbawa2724]

I love your videos sir and i have already learned a lot of new thing by watching to it

[@greatscottlab]

Glad to hear that

[@jacobwigent1931]

Really well-made video you made this a lot easier to understand!

[@greatscottlab]

Glad you liked it!

[@glenmartin2437]

Thank you. A nice review.

[@hansaKg]

finally!!! I've been waiting this video for long time. Thanx!

[@greatscottlab]

You are welcome :-) I hope the video answers all your questions :-)

[@hansaKg]

@@greatscottlab Oh it did. Now I can start using my new Rigol scope.

[@fireracerworkshop8251]

Really amazing video. I've been using oscilloscopes for more than 2 years now. I've never seen such a comprehensive tutorial about using oscilloscopes. Great job great Scott!!!!

[@greatscottlab]

Thanks mate :-)

[@dougsteel7414]

Excellent video, cheers!

[@gokhanince3059]

11:37 When I was in the university, We solved this problem with a bit of electrical tape to mask the PE of the oscilloscope. But this method can be painful. Please don't try at home. But instead of the tape method, I think an isolation transformer can work fine.

[@boulder795]

DO NOT connect an oscilloscope to an isolation transformer. Always isolate the circuit you are working on, or if that is not possible use differential probes. Never isolate your test gear

[@Ryan_Tidwell]

@@boulder795 Why? as long as there are no ground loops you should be fine.

[@eDoc2020]

@@Ryan_Tidwell Rule of thumb: only connect an oscilloscope ground someplace you would feel safe putting your finger. The device under test needs to be isolated. Whatever you connect the ground clip to becomes connected to the oscilloscope chassis. If you isolate the oscilloscope and connect the clip to a mains reference the electronics will be happy, but if you touch the scope then you could get shocked. Plugging an oscilloscope into an isolation transformer is actually safe. However it's pointless because an oscilloscope's power supply is already isolated. More importantly, and to Stephen's point, this can provide a false sense of security. It's the equivalent of touching bare high voltage power wires while "protecting" yourself by wearing rubber shoes.

[@AttilaAsztalos]

Isolating your scope through a transformer works just fine. Nothing wrong with it as long as you keep in mind that poking another mains-connected thing with it will make everything else hooked up to the scope and any metal on the scope itself also mains-connected. If that's too much for you, you have no business poking mains-connected gear, no matter which part you isolate, full stop.

[@eDoc2020]

@@AttilaAsztalos Plugging a scope into an isolation transformer doesn't accomplish anything because an oscilloscope's power supply is already isolated. If you really want to isolate its ground, just tape over the ground/earth pin in the power cord. I'll discourage this because of the risks involved, but if you decide to do this please be sure to use a _tested_ GFCI/RCD in case something goes wrong.

[@neoncyber2001]

Great scope tutorial! I will bookmark this video and send it out to any oscilloscope newbs I find.

[@gtb81.]

an isolation transformer is always recommended when working on something at mains voltage, that way if a mistake is made your equipment will be less likely to be damaged. it can protect you from a nasty shock as well, or worse

[@MorsAdvancedTech]

Scott: no don't do that it may cause a lot of damage Electroboom: here's how to make a 500000000000v wand and kill all electronics around the house

[@Kevin-jz9bg]

HAHAHA

[@rbmwiv]

I have the exact same current clamp as the one you showed!

[@nikims_]

Great video! This helped a lot in navigating my local hackerspace's scope

[@1boobtube]

Nikola, w2aew has a lot of this is what you can do with an oscilloscope content. I think eevblog has a how not to explode your scope video as well, in addition to this one.

[@theGentec]

I recently got myself a Picoscope wich i find quite handy. Im not doing any High Power/High Frequency stuff and use it mainly for 5V logic level and protocol analysis. And for this purpose this is just fine since it also can directly decode Protocols like I2C, SPI and UART. Since it is possible to export the data i was able to do a curve fitting in MATLAB for a step response - super nice :D

[@zaphodbond]

I've being teaching myself electronics and I wonder if someone can recommend a tutorial about learning to use an Oscilloscope. Maybe something where you learn by doing projects and then learn ways to debug or test your circuits. This is great by the way it's a good start, thank you!

[@theteenageengineer]

Oh thank god! I’ve been waiting for either you or electroboom to come out with a video on how to choose a scope

[@casperlegendary9380]

This motivates me to learn more electronis. thanks to you GreatScott!!

[@greatscottlab]

Glad to hear it!

[@ronvaiz123]

Great as always

[@user-jb5yc2ec5w]

Scott , you ae the best !!

[@Mladjasmilic]

I had electrical measurement classes at Faculty of electrical engineering. We worked with old analog scopes (2012). Our professor taught us that is we measure mains voltage or autotransformer that we can simply unground the scope by plugging it into ungrounded socked.

[@alisamerflorin]

Useful but dangerous.

[@AlienRelics]

Then the entire body of the scope becomes an electrical hazard.

[@Mladjasmilic]

@@AlienRelics So what? Sometimes common sense is better than relying on safety systems to protect you.

[@keenowl1410]

Great video!

[@deeprobardhan3411]

I have bought a hantek USB oscilloscope(20 mhz and 48MSa/s)since i cant afford a DSO, and that works quite ok for my POWER electronic projects. And Thanks sir for all this videos u made . Really appreciate it. Love from India.

[@greatscottlab]

Very nice!

[@Peter_Cetera]

Sehr gut erklärt!

[@arfeausmutt9884]

Parametric analyser was a fancy name for a simple curve tracer. Easy to do on an old scope using a 5vac transformer a resistor and a set of test leads. Set H to Ext drive. H equals sample voltage while V equals current through device under test.

[@kevgermany]

Good one. Will help many people. Thanks.

[@greatscottlab]

Hope so

[@richardscheffenegger9138]

When working with mains voltage electronics, it's a great idea to actually power the bench with a isolation transformer (and a fast acting, low current fuse,, if your inrush current allows that). Like in a IT grid, that was there have to be two faults, before current can flow (unlike working directly with grounded AC). (The fast acting fuse would also protect the isolation transformer. A 220V/110V dual output transformer with the power rating suitable to your project usually works fine....

[@flarosantana6330]

Ive been using a board called the espotek labrador that you plug into a computer with software and get various functions like oscilliscope and power supply. It takes some time and knowledge to set up, and may not have the best sampling rate, but if you need a basic oscilliscope for cheap, its like 30$ and works perfectly

[@msmith2961]

Great refresher on oscilloscopes. I'm still using an old 'Goldstar' CRO which does the job just fine for me (analogue audio), but amazed at how cheap the digital ones have got now!

[@ignispurgatorius5297]

Since you recommended differential probes it would be interesting to see a little video for them and what to look out for. Differential probes can come in ultra cheap

[@makermelissa]

Thanks. I found this video very useful. I’d love to see some more in depth oscilloscope videos.

[@greatscottlab]

Thanks for the feedback :-) I will see what I can do

[@rbmwiv]

I found a nice 2 channel 200mhz Tektronix scope used for $200. It was only 2 years old when I bought it a year ago. I started with a Tektronix CRT scope. I used it for many years and still use it sometimes especially since when I need more than 2 channels. 90% of the time a 2 channel scope is all I need that’s why I went with a 2 channel.

[@prathameshraikar5428]

thank you for exploring us with something new :-):-)

[@greatscottlab]

My pleasure 😊

[@RajuSingh-kq3lh]

Great work.keep it up sir

[@greatscottlab]

Thank you, I will

[@theomaia1460]

great video as always tysm

[@jameskidd7906]

As always a good vid sir! Thank u and 'bravo' but i think u forget the alignement of trace before using the oscillo for the first time with a square signal

[@stuartbridger5177]

Nice video. This reminds me of when I worked in a repair shop many years ago. We had early Tektronix graphics terminals. For some reason known unto them, the display logic boards had a signal "ground" that was floating at +600V DC. My colleague would unhook the PE from the scope power plug, put a paper notice on the scope (also Tek) Saying "Don't Touch" . Then connect up the scope probes and start diagnostics with the scope case, BNCs, etc, all at +600VDC! Wouldn't be allowed now. We certainly didn't have isolated differential probes available back then. Incredibly dangerous work practice, should not be attempted.

[@electronic7979]

Nice video. I liked it

[@barnabywilde374]

everyday now i see that i'm a fading technician. So much has changed since i began my hobby/job in the late 1970s. My 20MHz B&K was a home "standard," and i'm in awe of modern oscilloscopes. Now, we REPLACE ENTIRE BOARDS, whereas in my day we replaced mostly components. It's a magical time to be alive now, kids. We have computers in our pockets and advanced electronics that perform all kinds of astounding tricks. And mostly, we have fine folks running video sites like this offering FREE instructions and advice. Thank you!

[@2wrdr]

I'm right there with you, went to "Tech School" studying Electronics Technologies majored in RF Electronics. My first 2 jobs (Motorola 2-Way Repair Shop then Satellite Receive Only) both jobs I did component level troubleshoot with scopes replacing discrete component and some ICs. For me those were the good ole days and I loved it for the satisfaction of constantly solving the puzzles of failed electronics then seeing my work....well work. Not long after lots of equipment became throw aways and there just wasn't much $ in being an electronics technician. I got lucky with a railroad job that then led me into railway signal engineering which paid much more even though I didn't have an engineering degree I was able to do the work so that worked out well but it was never as fun as doing real component level repair.

[@kctecharena116]

I like your videos very much and watch them regularly.I have a request for you, please make a sjr looper circuit and show it.

[@shazmiah]

Hi. I love your channel and am a subscriber. The other way to avoid the problem with AC powered projects and Oscilloscopes is to get a battery powered Digital Storage Oscilloscope(DSO). I have and OWON DS7102V 2-channel, and whenever I do any AC stuff I simply disconnected the AC power to the scope and switch on the rechargeable internal lithium Ion 18650 battery pack. Isolated probes are very ( extortionately ) expensive . I think you should have mentioned that as one of your alternatives. You can pick up a decent 2-channel 1GSa/s DSO for around £500.

[@MrJugsstein]

Thanks great info

[@2ndaccount479]

Thank you!

[@OldCurmudgeon3DP]

The first scope I ever used (in middle school no less) had vacuum tubes and a CRT. Tons of knobs. 2 large RG type probe connections. Weighed several kg and was the size of a medium suitcase. No manual, but somehow I managed not to blow it or myself up even when messing w/ an AC stepdown transformer.

[@TheBlibo]

Hi Electronics was only ever a hobby for me and I stopped at analogue stuff In my job years ago doing engine development we had the use of a scope only single channel and no storage facility, if you wanted storage you clipped a Polaroid camera to the screen hi tech back then, isn't it wonderfully that you can now download an app to use your phone as a scope Keep up.the good work

[@glasslinger]

The scopes can also be isolated from the power line. The input power supply of the scope meets certain international standards that include 2000 volts isolation, as good as an isolation transformer. Of course when doing this BE CAREFUL since you can have the common of the scope at high voltage with reference to ground. (only to be done by experienced users)

[@AubsUK]

Great, as always. I'd love to see a review of some of the cheap (

[@Yotanido]

Already knew about the problem with measuring mains referenced voltages from EEVBlog, but it was a nice refresher. ...not that I have an oscilloscope. Or, for that matter, do much with electronics...

[@USAWal]

I just realised that I honestly like Scott's diagrams!

[@ThePo707]

When measuring the output ripple on the switch mode power supply you should not use the long ground wire on the scope, this will make ripple bigger

[@martinoptilon9915]

Thanks for sharing your knowledge in a very straightforward and comprehensible way. Now I just have to save up to buy the cheapest oscilloscope I can find :)

[@arnavjindal3021]

I am still in school, understood 25%..... Searching meaning of everything you told from Google. 😍🤤..... Way too curious to learn everything bout electronics. I have and old oscilloscope lying.... Will apply knowledge on it.

[@JAYANTHISUDUPIRECIPES]

Hello Scott nice video 👍👍

[@greatscottlab]

Glad you enjoyed it

[@nil3010]

The more know about oscilloscope more I want one man it will be really helpful thing to have

[@greatscottlab]

It is pretty much essential to a lot of projects.

[@nil3010]

@@greatscottlab As someone who works with amplifier and op amps it is essential

[@MCsCreations]

Fantastic, dude! Thanks a lot! 😃 Stay safe and creative there! 🖖😊

[@greatscottlab]

Thanks, you too!

[@syaduinotech3681]

Very good content. You inspired me about electronics. Seems like I want to get a degree in this field. So exciting learn from you..

[@greatscottlab]

Best of luck!

[@flomojo2u]

Really looking forward to a video on your DIY mains PSU! Been thinking about building my own but it's a little scary.

[@Jhale716]

They're not too bad, clean tidy workspace and watch out for charged caps. The rest is pretty straight forward. It’ll bite if you screw up, though running on an RCD will help protect you from that and serious sparks.

[@HackingElectronics]

Once that circuit was connected to mains, I thought the circuit was gonna blow up but sadly we are not in ElectroBoom's channel... Edit: Lol I just saw many comments same as mine.

[@Jesperkraakman]

I wish i heard a “HOLD IT” when I first made this mistake, of connecting the scope ground to the rectifier - of an SMPS…

[@zacharychristy8928]

If space or money is a concern (and you have a computer), I really like my Digilent Analog Discovery 2. It's $400 (but priced cheaper for students), and it's got a 2 channel oscilloscope, signal generator, multimeter, protocol analyzer and frequency analyzer, all in a package about the size of a deck of cards. It's definitely got limitations, but for most hobbyist applications it's more than enough. I've even done entire electronics labs for school just using that one little device!

[@Jhale716]

Yup more than capable for the majority of people. In my service days I had a 20mhz CRO a bit of a beast to lug. Didn't need it nearly as much as one thinks. The USB ones with logic analyser are very handy.

[@robinsattahip2376]

I was hoping you would talk about isolation transformers, please. Thanks, as usual, your videos are great.

[@Willeexd1337]

Nice i just got my first "scope" (DSO138 kit) so this is perfect for me

[@greatscottlab]

Awesome :-)

[@radiosantigos1894]

Nice demonstration. Thanks! I only wonder if you can explain a little bit more of the mistake of a regular probe measuring the mains (compared with a battery powered portable oscilloscope, for example). In a future video, of course.

[@mixxx2005]

My rule of thumb is to first check voltage with multimeter between desired ground point and oscilloscope ground clamp. If 0 or open circuit, then all good to attach ground. Else - start to look for electrical tape for PE 😇