{534} How To Measure Mains Un-Isolated AC Line Voltage With DSO Digital Storage Oscilloscope

in this video i demonstrated How To Measure Mains Un-Isolated AC Line Voltage With DSO Digital Storage Oscilloscope. Sometimes we need to measure mains live unisolated ac voltage voltages with oscilloscope. you must take special care while measuring voltages on the mains with any measurement instrument. The mains voltages are absolutely deadly because these have un-isolated supply. Measuring mains voltages with multimeter can be dangerous as well. but Trying measure mains voltage with oscilloscope is more dangerous, because typically oscilloscopes are are grounded devices that have the ground side of the probe connected to the equipment case. while making connection to mains voltage slightly wrongly can make a huge disaster causing short circuit, damage the probe, your oscilloscope or human injury.

If you are trying to use a traditional bench oscilloscope that is powered up with main line volatge, ALWAYS MAKE SURE YOUR SCOPE IS GROUNDED BECAUSE THE GROUND IS THERE FOR YOUR SAFETY!
1. in this best choice when we need to measure mains voltage with oscilloscope is to use a completely isolated oscilloscope like battery powered oscilloscope or scope-meter.
2. if you need to use bench oscilloscope, then use an islolation transformer, in that case you can measure line voltage without any danger
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[josealexanderdeleonfernand]

Thank you from Guatemala, I know that only theoretically,
I saw an Englishman explaining the theory but he does not do the measurement in practice. Thank you again, you bolstered my confidence even though I theoretically knew it could be done. Best regards and God Bless you.

[davestredulinsky]

An excellent demo of measuring un-isolated AC line voltage with your oscilloscope. I enjoyed to the end. Thank you my friend.

[DonatoGreco]

You better use the isolation transformer to power the device under measurement and use the grounded power connected to the DSO (oscilloscope) as a security measure against Live voltage contacts, assuming you have a safety switch on your home power circuit

[carlosruizmora]

Hello, this video has resolved several doubts I had, ممنون

[majharulislam]

It is very informative and useful for us to secure our oscilloscope from AC line power quality measurement

[shanzay]

Happiest birthday @Haseeb Electronics 🎉🎉🎉
Allah aap ko achi sehat wali lmbi zindagi de aamennn❤️

[HarlavanisPanagiotis]

Excellent video dear friend, happy new week!

[commandoo]

Thanks for explaning it clearly. I had
same question in one of oscillioscope tutortials but some how it was gone un-noticed .

[parveenskitchen]

Nice video nice sharing bhai bahut Achcha aap dikhte hain aur samjhate Hain well done keep it up connected

[coloradowilderness]

Very valuable lesson for All.

Thanks Haseeb.

[sudheerkumar]

Very good sir ji 🙏
Es DSO series se DSO seekhane ko mil rha hai
Plz make more videos on DSO
Thank you.

[MDRIZWAN-besl]

Thank's sir, for giving attention towards my question...

[christophertadeo]

Unisolated ... Very definitive description ... 😁

[CliveTrezona]

Thanks Haseeb. If we dont have a battery scope, can we use a little 220v inverter to power the scope?

[voiceofimranasupportid]

Superb sharing
Zabrdast amzing
Meri smjh sa bhir hai sir wesy 😋tusi great ho g 🌸

[temyraverdana]

Thanks, a wonderful and precious explanation. Do you think is better cover with isolating cup the other free channels to safety?

[Luke-V]

good evening, I wanted to ask if it doesn't matter if I connect the isolating transformer to the oscilloscope or to the measured device, the problem is that I don't have such a powerful transformer, so I would put the measured object in a normal socket, thank you very much for the possibility expressed

[szvencel]

Hello and thank you for this informative video. I have the very same scope and I was planning to check my un-isolated AC Line so your video id pretty helpful. You say that we should not touch remaining open connectors (CH2 and EXT TRIG), but what's the reason behind it? Thank you!

[DaftyBoi]

Am I correct in saying If I am measuring 200-300V AC/DC in a circuit powered by mains via an isolation transformer (the circuit not the scope), It is OK to measure without isolation transformer on scope? Or will there be issues if the ground probe is connected to safty earth via the circuit in just the same way?

[SanelKeys]

I always power D.U.T (device under test) from pretty bulky isolation transformer (1kW). Then, after that, when testing switching psu of any kind, I use serial bulb, up until I see no problems, such as short circuit.
Safety first!