How to test a Transformer using digital multimeter

In this video, we will see How to test a Transformer with a digital multimeter. The transformer testing method is very simple and it requires only a multimeter to test the transformer. I will also explain how to identify primary and secondary winding of a isolation step up or step down transformer.
I will request you to watch the complete tutorial video of the Transformer testing but you can also jump to any topic by click on the following Time Stamps:
00:49 How to identify the primary and secondary [high voltage & low voltage] windings.
05:07 How to check the transformer using a multimeter
07:42 How to calculate the turns ratio of a transformer
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Here I have used an isolation step down transformer. For a good transformer, the resistance of the windings should not be infinite and the resistance between the core and both windings should be infinite.
In the video, I have shown the transformer testing method in simple steps so that you can easily follow the steps while testing an isolation transformer.
If you have enjoyed the video please hit the like button and share it with your friends. For more such videos don't forget to SUBSCRIBE our channel and please do share your feedback in comment sections. Thank you for your Support.
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[@murdermachine9]

always appreciate electronic tutorial that has english title and really explain it in english

[@joelongstaff7601]

Sir Thankyou for a great video. I built a colour organ about 50 years ago and found it at my moms estate and for some reason couldn't remember the parts. Now I can test the transformer and rebuild it for my grandchildren. Thankyou for making it easy to understand what you where teaching. God bless.

[@Savage-lx5yj]

Your videos are filled with excellent content! Clear and concise! Thanks!

[@reydus6651]

excellent explanation man, I had been *extremelly* confused with 3-pin arrays I have seen. Turns out it is just a dividing "pin in the middle of the winding" thing!! Thanks a lot

[@TechStudyCell]

You are welcome

[@federicodimarco1764]

center tap!

[@bparker86]

Yessir. Otherwise known as a center tapped coil, also there will be times you'll see a transformer that has multiple taps. Sometimes on primary sometimes on secondary. Or both. Depending on the application the transformer originates from.

[@bparker86]

And those taps can be identified in order by simply using the same method that the kind sir that made the video pointed out.

[@alfredcalleja450]

Excellent tutorial: thank you.

[@TechStudyCell]

You are welcome

[@johnjohnny717]

Im from Singapore, and this is by far the best explanation so far. Keep up the good detailed information.

[@prakashb1433]

Very well explained with writing and diagram, practical wonderful keep going same thank u made this video 👍☺️

[@TechStudyCell]

Thanks for the feedback 😊

[@bassreaper7779]

Excellent. Exactly what I needed to see to test a transformer. Big thumbs up!

[@TechStudyCell]

Thanks for the feedback...

[@homoudalyahya4618]

Thank you so much for well explained testing methods. I replaced the outlets of my transform and I forgot to mark which is primary and which is secondary. Your tutorial will help me identify them now. 👍

[@TechStudyCell]

You are welcome...

[@homoudalyahya4618]

If you kindly answer the following question
I have a transform from 220V to 100v and as I said before, I am not sure which side is the primary and which is the secondary. My question: if I plug one side to 110v and measure the voltage at the other side, if it is below 110v then this side is the primary and if it is greater than 110 it is the secondary. Is this a correct way to determine which is which.

[@TechStudyCell]

The coil can be damage if you apply high voltage at secondary. So check the coil resistance. For step down transformer the primary coil has higher resistance and secondary coil has lower resistance.

[@ericstandefer9138]

Great excercise for my students thank you.

[@TechStudyCell]

Thanks for your feedback 😊

[@paulaatchison6492]

Thank you for the education via example, narration, and visual drawing. This is perfect. Thank you again

[@TechStudyCell]

You are welcome

[@khaledyanimi1371]

Man, that was hell of a great testing. Keep it up.

[@rdp8545]

Very good explanation on how to do a basic test of a transformer. well done as this has been probably the best and by far the most well explained.

[@TechStudyCell]

Glad you liked it!

[@TheMercuryraju]

excellent bro, I keep watching your lesson

[@TechStudyCell]

Thanks for the feedback 😊

[@aarontsopo3450]

well explained video on both the test meter and transformer

[@TechStudyCell]

Thanks for the feedback 😊

[@joshuakatumba6644]

Your drawing is awesome. And the explanation too is simple, accurate. The best I've watched about the topic

[@TechStudyCell]

Thank you so much 😀

[@garrygemmell5676]

Most illuminating tutorial: thank you. old chep
👏

[@TechStudyCell]

Thanks

[@johnhandley9041]

Brilliant video, thanks for explaining things so clearly

[@TechStudyCell]

Thanks for the feedback

[@mjdthemaker7574]

Very educational. Thank you.

[@TechStudyCell]

you are welcome...

[@williamgilbert842]

Excellent description of a transformer operation and testing- this will aid me in the training of our field servie tech's

[@TechStudyCell]

Thanks for the feedback...

[@martinkuliza]

let me understand this...
so... You train your techs based on shit that you find on you tube
LOL...... My god
and to boot, You can't spell "SERVICE TECH'S" correctly
Mate, i don't know what to tell you .
it's not like this is a lecture on Thevenin's theorem or perhaps Fourier Transform, this is basic standard bullshit resistance testing that i knew when i was literally 6 years old (i'm now 48) it's what my 14 year old nephew knows after only having been in electronics for 6 months approx.
Now.. You seem to be (i won't use the word PROFESSIONAL) an industry person who is conducting a business
jesus mate, ... if you need a you tube video to show you how to measure resistance or to test a transformer maybe you shouldn't be in that line of work
yeah.. I'm just kinda speechless that you would actually come here and say that you're going to use this to train your techs
- No disrespect to the author of the video
- and it was a good video
and if you were a hobbyist or starting out i wouldn't say anything LOL
but Jeez mate, You're a business who has many tech's under you
and.. I bet they don't even know that you didn't know this
WOW.. I really don't know what to say
(I'm trying hard not to be rude, but it is what it is ) but even given that and we all start somewhere, you still came on here and said it LOL
that's the funniest part
anyway .... yeah, those are my thoughts
it's not a good look mate

[@asenciozima]

Thank you for the explanation. very good

[@TechStudyCell]

You are welcome 😊

[@alikaampo9370]

Excellent tutorial 👌, as you mentioned the two resistance and voltages (if adapter has 1.5v, 3v, 4.5v..., and so on will it be the same to determined?) Thanks.

[@diesunddasDE]

Thank you very much, it was very informative! 👍🧵⚡️

[@WLguitarist]

Thank you! This is the ONLY video where things are NOT confusing!

[@TechStudyCell]

Thanks for your feedback...

[@WLguitarist]

@@TechStudyCell Thanks for putting up videos that get directly to the point without any lectures or confusing theories. I've also asked you a question on one of your videos regarding identifying leads on a unknown power transformer. I've looked everywhere and there are information but the info they are providing are confusing, almost as if i need to study electronics or engineering to understand, now for a FYIer or 'home brewer' like myself and i'm sure there are a lot of other people like me out there, how the heck do you ID an unknown power transformer like the one I have. Almost all the people that talk about it have special equipment to provide or controlled electricity coming to the PT, but I do not. All i have is a multimeter.

[@cliffordalexo234]

Thanks .Explained well.

[@TechStudyCell]

You are welcome...

[@unattax8592]

Thankyou for taking the time to share your knowledge . I learned what I need to test my transformers .

[@lanceljloi3196]

Nice...good explaination mabuhay bro.....

[@TechStudyCell]

Thanks

[@sunilmenon7115]

Very good class ,nicely explained with drawings.Thanks bro!!

[@TechStudyCell]

Welcome

[@samratbarat19]

Very well explained Sir. Would you recommend connecting a variac and then powering the newly made small power transformer to check the voltages at the output after the resistance values are checked?

[@juliuskitomari3057]

Very good demostration

[@TechStudyCell]

Thanks

[@sdapathfindersdaily3224]

Make me love physics once again... Educative lesson. Thank you

[@prettypointlessvideo]

Great video. Warning though everybody please be careful measuring while using mains voltage!

[@colindiggle9377]

thank you for your help never sure which sides main wires go to on the transformer great explanation drawings great please do more x

[@chiranjeevig8740]

very clear and neat explaination,super
Easy to underdstand for anybody

[@Funfacts81]

Very well explained

[@stevebagga9513]

Excellent explanation! Thanks!

[@TechStudyCell]

You are welcome 😊

[@JimMcFerry]

Very competent tutorial. Well done.

[@jakedillingham]

That was great, thank you very much please don’t ever delete this video

[@TechStudyCell]

Thanks for the feedback

[@drniketu]

Very informative sir. Thank you for great video.

[@TechStudyCell]

You are welcome

[@Joseph-fe5vi]

Thank you your a great teacher

[@shawn7236]

One of the best video's on transformer's that I have found thanks bud..

[@TechStudyCell]

Thanks for the feedback

[@N5OLA]

You explained this perfectly. Thank you for your video! :)

[@TechStudyCell]

Thanks for the feedback 😊

[@aben776]

Nice tutorial. I learn more from this than attending class.

[@fariqrashid898]

Tq sir. Straight forward yet detail.

[@john80396]

Really helpful, thank you.

[@electronic7979]

Useful video

[@TechStudyCell]

Thanks

[@Metroid1890]

I'm having my doubts whilst working with old or salvaged transformers, you helped me a lot!

[@TechStudyCell]

Thanks for the feedback. But be careful while working with high voltage

[@commonsense3673]

@@TechStudyCell showing the exact setting on the multimeter to check for 24 volt to the device would have been better ? Meter setting is very hard to see from the distance and alot of people speak English or understand English better than you speak it ? Sorry just an opinion

[@kuruption1983]

Very useful! Excellent explanation!

[@TechStudyCell]

Glad it was helpful!

[@nicksharp9122]

Great video, thanks!

[@timothymuir5167]

Thank you, You helped me understand how to test a step down transformer.😊

[@TechStudyCell]

You are welcome!

[@zoldikbillel4185]

Thank you FROM ALGERIA

[@TechStudyCell]

You are welcome 😊

[@jasonsmith3573]

very well explained, very clear and concise.

[@TechStudyCell]

Thanks

[@trueforum378]

Excellent video!! Well done brother

[@MAXIMUMintheHORMONE]

Perfect video! subbed!

[@TechStudyCell]

Thanks

[@williambock1821]

Thank u! That was so easy to understand I’m subscribing to the channel!

[@TechStudyCell]

Thanks for subscribing!

[@levistrnad2965]

Wait, what's the middle pin on the one side for? Please tell I might try to make Jacobs ladder somehow with tiny voltage

[@TechStudyCell]

The middle pin is connected with the middle of secondary coil. So if connect a voltmeter across the secondary terminals you get total secondary voltage in this case it is 20volt. But if you need 10 volt output then you have to connect the voltmeter or load across the middle terminal of the secondary coil and one of the side terminal of the secondary coil.

[@FarmerTed]

Nice job! Thank you. Thumbs up!

[@TechStudyCell]

Thanks for the feedback.

[@cinemachitralu5321]

It's nice helped

[@TechStudyCell]

Thanks for feedback

[@guitarhome3929]

Good explanation

[@tuhafeninekongo5176]

Thanks very much for this video but one question though, what if my laptop charger is making a buzzing sound could it mean that my transformer faulty and that sound comes from there?

[@zanasvysniauskas4269]

Excellent explanation! Thanks a lot!

[@TechStudyCell]

Welcome

[@ronsen9974]

you have explained very well. Nice and informative video. well done

[@TechStudyCell]

Thanks

[@jomonantony3936]

Nice video and plz make a video for testing autotransformer

[@TechStudyCell]

Thanks ...

[@hamzamalik7305]

Thanks For Detail Information

[@dhinakaranmahalingam4037]

Good explanation man

[@TechStudyCell]

Thanks

[@jamesallen6007]

Many thanks. You have earnt my subscription. 🇬🇧😷👍

[@trmusa3434]

good tutorial

[@TechStudyCell]

thanks

[@89Ssik]

Thank you for this video, learned a lot.

[@TechStudyCell]

Thanks for the feedback

[@sivaselladurai3143]

very well explained

[@TechStudyCell]

Thanks

[@sennapode]

Nice and clear. Great explanation

[@TechStudyCell]

Thanks

[@wiserdaley2191]

Thank you Sir. Very helpful information

[@TechStudyCell]

Thanks for your feedback

[@wiserdaley2191]

@@TechStudyCell this is one of my learning channel now. You teach very well.

[@Cdswjp]

Thank you

[@jorgechavez5060]

Can you put the black lead on any terminal when checking if it’s open around minute 7.3

[@decem_unosquattro9538]

Thank you. This is a very good video. I like how you explained many things about step down transformers. 🙂👍

[@TechStudyCell]

Thanks for the feedback

[@decem_unosquattro9538]

@@TechStudyCell You are welcome.💜

[@demontagemontage]

thank you ,if there is tool mesuring exactly the trans??????

[@mustaphaessahihi1762]

Hello, could we use the same method to test the SMPS transformers?
I don't have any voltage across the output legs of smps transformers is this enough to call it a non working transformer?

[@aliali-et7xh]

Good video man.. Tq..

[@tetrismk]

Hello.Thank you for the very good explanation. I have a question. Can I check like this the transformer directly in the circuit without desoldering? Thank you

[@TechStudyCell]

No, it is not recommend.

[@tetrismk]

Thank you for your fast comment

[@alexbarretto4331]

Thank you.

[@TechStudyCell]

Welcome

[@junpineda166]

Galing..salamat

[@Pskawt]

If you get infinite resistance across any of the terminals it means there is a short somewhere in between the windings right?

[@ryanjerred9893]

very well done. thank you

[@TechStudyCell]

Welcome

[@abcdefgh99697]

Thank you sir

[@TechStudyCell]

Welcome

[@techie587]

Fantastic

[@shis10]

👌👌

[@Editz_withRexu]

Excellent, this is what I was looking for. Can you explain how to convert the secondary AC POWER to DC 12V or 24V? Thanks in advance

[@salvatorebelcastro2147]

you need to use (or build) a rectifier. Google rectifiers

[@fuorman4872]

very good question
i think you need to remove some turn wire in secondary to reduce output volt
if you have better answer tell me

[@nixietubes]

@@fuorman4872 They're asking how to convert the ac to dc, as the first reply said, you use a rectifier

[@riviera443]

nice

[@TechStudyCell]

Thanks

[@a68riz]

Very nice, thank you sir

[@TechStudyCell]

You are welcome

[@kennethlobo4420]

Great video

[@seremaiarabaraba296]

Thumbs up on your work.. great tutorial..👍

[@TechStudyCell]

Thanks for liking

[@user-mw9gy3ew6m]

good thanks

[@TechStudyCell]

Thanks for the feedback.

[@user-mw9gy3ew6m]

@@TechStudyCell
hi indian man
If you write your email address it is better. I have some questions

[@user-mw9gy3ew6m]

According to Ohm's law, the voltage is equal to the multiplication of current in the resistance
But, for example, when we measure the current of a refrigerator, it shows about one or two amps. Ohm's law is not right.

[@TechStudyCell]

Ohm law works on DC & for pure resistance. In refrigerator current is AC and it's not at all a pure resistance.

[@user-mw9gy3ew6m]

@@TechStudyCell
thanks
What is the ac formula?

[@Ziplock9000]

This video is put together very well

[@TechStudyCell]

Thanks for the feedback

[@sudhirpatil3434]

Good presentation! But if I have a transformer i dont know heather it is step down or step up- how can I find out?

[@ecobob101]

May I answer? If you connected a 24v AC (not DC and not using the center tap) to the high resistance side (which is the secondary in the vid) and a load (e.g. 75w light bulb) to low resistance side (primary in in vid) of the transformer in it will now be a step-up transformer. So it depends on which side the power source is on.

[@goodnewsmoses3549]

Educative

[@TechStudyCell]

Thanks...

[@RodgerLucky714]

Thanks

[@junkomailo5335]

I used the information in this tutorial to test my transformer. The transformer was good. The interesting thing about the circuit that I was testing is that the return runs through the chassis. There is only 1 wire to the base of the lamp. If there is a break in the chassis, then the lamp won't work

[@texansoul78]

Great video👍

[@TechStudyCell]

Thanks

[@amorbsaber667]

very good

[@TechStudyCell]

Thanks...

[@nimalrupasinghe9491]

Excellent presentation

[@TechStudyCell]

Thanks

[@__djcruzer__8986]

i have step up transformer the secondart is 0.6 ohms and the primary is 5ohms...is my transformer in good status?

[@stevebagga9513]

Look at the video again and do all the tests he shows to check if it is good.