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How to Test Motor Start and Motor Run AC Capacitor of ac fan and compressor 

Tech StudyCell
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In this video, I have tested a 440VAC 30 MFD start capacitor by using 4 different methods. So that if you don't have a Capacitance meter, still you can test the capacitors.
Previous Video:
How to Test Capacitors with and without Multi-meter.
• How to Test Capacitors...
01:13 [1st method:]
In the first method, I have tested the start capacitor without using any multimeter. If you don't have the multimeter or any small DC source then you can use this method. But you have to take proper safety precautions.
03:22 [2nd method:]
In this method, I have used a 20 volt DC source to charge the capacitor,
and a small DC load to discharge it.
04:37 [3rd method:]
In the 3rd method, I have used a multi-meter that has ohm scale, to test the start capacitor. with the above 3 methods, you can check the charging and discharging of the capacitor.
06:24 [4th method:]
In the last method, I have used a multimeter that has capacitance (Farad) scale to test the capacitor. This is the most accurate method for testing the capacitor.
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23 мар 2017

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Комментарии : 305   
@oldroscoe2590
@oldroscoe2590 4 года назад
I've got an old motor with a start capacitor, the motor only hums when I try to start it. I cleaned the centrifugal switch contacts and it still only hums on start...... so I wanted to test the capacitor and that's how I wound up here. Now I shall go test the capacitor, I'll be right back with the results........ and I'm back and still alive .... the capacitor on the motor is DEAD, won't hold a charge after numerous attempts. Another capacitor I happened to have did hold a charge and a nice spark on the run and start side. I 'll order the correct capacitor for the old motor and see if that will get it to start properly. Thanks for the youtube. No telling how many motors go to the scrap yard when a new capacitor would fix them. Thanks again.
@joeli1571
@joeli1571 6 лет назад
Excellent amazing clear and understanding how to test different method on capacitor..... great video!! definitely will follow your videos.
@TechStudyCell
@TechStudyCell 6 лет назад
Thank you for your feedbacks...
@mohamedsaad6506
@mohamedsaad6506 2 года назад
ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-YGSHcyWju9c.html
@6A8G
@6A8G 5 лет назад
The first way looks the best fun but please use a quick test block or similar. These are designed to temporarily connect things to the mains. Just makes it a bit safer for you. Thank you so much for posting:)
@mohamedsaad6506
@mohamedsaad6506 2 года назад
ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-YGSHcyWju9c.html
@usherkaliwonge3082
@usherkaliwonge3082 2 года назад
But I have question,, if that dead dry battery acid use like they way done to use salt with water. So if you put salt with water for that dry dead Battery so you gona using only salt with water or u can put also acid in that battery?
@ben6089
@ben6089 5 лет назад
Great video, nice you shown 4 different ways. The first way looks to be the most fun.
@TechStudyCell
@TechStudyCell 5 лет назад
Thanks for your feedback 😊
@N0G0MAIL
@N0G0MAIL 2 года назад
Excellent. We can measure the capacity of 30uF using another capacitor. If we have another 30uF, we put them in series and we have 15uF. If we have one under 20uF, we measure it and we find the value = a, then we put it in series with the larger capacitor and we find the value = b, b
@vashudevmanna
@vashudevmanna 6 лет назад
thank you for valuable knowledge
@grandebigy
@grandebigy 4 года назад
Looking all over for this . You solved my problem thanks
@IanSolomons73
@IanSolomons73 6 лет назад
Hi. Thanks so much. You've save me around 4900 rupees
@AmbroseAgde
@AmbroseAgde 4 года назад
Excellent video. Thanks a lot for sharing those tips. The first method is somewhat "hair raising"! :)
@TechStudyCell
@TechStudyCell 4 года назад
Thanks for your feedback 😊
@Nmomand1
@Nmomand1 2 года назад
I knew three methods, but now, I know all about capacitors testing. THANK YOU.
@phillipribbe4928
@phillipribbe4928 2 года назад
Very clear and simple, thank you.
@johndaka6968
@johndaka6968 4 года назад
Simple and straight forward practical experiment on how to test a capacitor.. AWESOME...
@TechStudyCell
@TechStudyCell 4 года назад
Thanks. But if you have multimeter then refer this ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-QWCLPfIrp-4.html
@jayryan7473
@jayryan7473 4 года назад
One of the best capacitor testing videos on RU-vid. Thanks!
@luanyeung2385
@luanyeung2385 3 года назад
8
@eagleeyes6972
@eagleeyes6972 4 года назад
thanks for a good job. that you explain in different ways. I follow your job and look forward to more about other things i have idea but i don't know if it is appropriate to say publicly but if you want let me know
@rammuana5266
@rammuana5266 2 года назад
Aside your simplicity and skills I enjoyed your videos Mostly because other videos out there were in hindi which many will not understand including me of course. Keep up, much appreciated👍👍
@johncasor9698
@johncasor9698 7 лет назад
Another Great Video... Thank You Very Very MUCH....
@TechStudyCell
@TechStudyCell 7 лет назад
You are welcome...
@dodznb238
@dodznb238 2 года назад
Hello my dear friend capacitor i think this copacitor is could running capacitor , starting capacitor is normally open in start motor, running capacitor is not open thrle motor is opperation..thank you for sharing tjid video..👇👇👇🤝🙏🏼
@charleshughbryan5603
@charleshughbryan5603 3 года назад
Thanks for a great video in excellent English and explained so a novice can duplicate it.
@modimaruti5874
@modimaruti5874 6 лет назад
Great informative video sir 👍 👍 👍
@RudeMcNasty
@RudeMcNasty 6 лет назад
Yours is the fourth video I've watched on the subject and by far the most helpful! Thank you.
@TechStudyCell
@TechStudyCell 6 лет назад
Thanks for the feedback...
@desalegnderesa8352
@desalegnderesa8352 4 года назад
Thanks
@davidcoro27
@davidcoro27 7 лет назад
Great help, thank you.
@TechStudyCell
@TechStudyCell 7 лет назад
You are welcome.
@soundarajans1258
@soundarajans1258 6 лет назад
David Coro 77
@MrDATOPIDI
@MrDATOPIDI 3 года назад
Thanks for the info. Good explanation. Keep it up.
@jononeil500
@jononeil500 3 года назад
Excellent explanation. Very comprehensive. Thank you!
@TechStudyCell
@TechStudyCell 3 года назад
You are welcome
@giorgiovasta7128
@giorgiovasta7128 4 года назад
Great video and very professional and good job 👏🏻
@TechStudyCell
@TechStudyCell 4 года назад
Thanks
@gazaziho
@gazaziho 5 лет назад
It's informative video. . Thanks alot
@TechStudyCell
@TechStudyCell 5 лет назад
you are welcome
@joesanmartin776
@joesanmartin776 5 лет назад
Thank you very much. This was very helpful.
@TechStudyCell
@TechStudyCell 5 лет назад
You are welcome 😊
@Boubaker_elbikam
@Boubaker_elbikam 6 лет назад
thank you so much
@sabahabdullah356
@sabahabdullah356 4 года назад
Thank you very much my friend.
@debjanibanerjee7390
@debjanibanerjee7390 7 лет назад
Great video...
@PitchPerfectKill
@PitchPerfectKill 3 года назад
Thank you, very informative!
@TechStudyCell
@TechStudyCell 3 года назад
Glad it was helpful!
@KYTVIDEO
@KYTVIDEO 4 года назад
great video!
@TechStudyCell
@TechStudyCell 4 года назад
Thanks
@arcadesunday4592
@arcadesunday4592 2 года назад
Thanks for the video. How do you know if such a capacitor is actually faulty or needs to be replaced? I've got a garage door opener motor which no longer works, and I think the capacitor is dead... When I test with multimeter (3rd method) nothing happens at all on multimeter. Just stays on 0.0?
@Savage-lx5yj
@Savage-lx5yj 2 года назад
Excellent! Thanks!👍
@kabandajamir9844
@kabandajamir9844 Год назад
The world's best teacher thanks sir
@queasyRider3
@queasyRider3 2 года назад
You are brave to test like that. And much more experienced with electricity than I am. I'll call an AC tech instead; but thanks for letting me know how risky this can be.
@timallen6025
@timallen6025 3 года назад
Yup. Fixed washer dryer , thank you Sir Thinking Mans tv 👍👍🙏
@samuelusen3919
@samuelusen3919 4 года назад
Teachable i really lean something .
@TechStudyCell
@TechStudyCell 4 года назад
Thanks
@kilnprabu
@kilnprabu 4 года назад
can this be connected to a battery for a moise trap, i had few of those from a ripped washing Machine
@rizaldemelecio8847
@rizaldemelecio8847 5 лет назад
thanks for info.
@TechStudyCell
@TechStudyCell 5 лет назад
You are welcome 😊
@SarjanaObeng
@SarjanaObeng 5 лет назад
Thank you. This trick really useful for my trouble since I only have a multimeter without capacitance meter. My air con capacitor shows still charge and discharge by the multimeter, but how can I know that the function is still good?
@luisortho1165
@luisortho1165 2 года назад
Just viewed your video, thanks I appreciate it.😎
@stephenaquila7510
@stephenaquila7510 6 лет назад
Thanks, very helpful, I really appreciate that teaching, but I will really be happy too to get a line to contact you we needed;thanks.
@TechStudyCell
@TechStudyCell 6 лет назад
You are welcome...
@mohamedsaad6506
@mohamedsaad6506 2 года назад
ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-YGSHcyWju9c.html
@selvampandurengan6191
@selvampandurengan6191 6 лет назад
sir very useful this video thanks
@TechStudyCell
@TechStudyCell 6 лет назад
You are welcome.
@4games2gamers
@4games2gamers 6 лет назад
yes i did: thumbs up
@TechStudyCell
@TechStudyCell 6 лет назад
Thanks...
@williamreith1632
@williamreith1632 5 лет назад
Thanks for the very clear explanation. Thumbs up.
@bilicbuilt
@bilicbuilt 3 года назад
good video, thanks for info, well explained, can you please tell me how can I find out, how many uf capacitor is, if the label is not readable thanks
@IamFreeRu
@IamFreeRu 6 лет назад
Thank you
@TechStudyCell
@TechStudyCell 6 лет назад
welcome...
@joseamaya6515
@joseamaya6515 4 года назад
an excellent video
@peterco2600
@peterco2600 4 года назад
Very helpful, thank you
@eddyoddrod
@eddyoddrod 5 лет назад
Helpful video. I did have to use the captions. My brain just isn't wired for that accent. Good video though.
@TechStudyCell
@TechStudyCell 5 лет назад
Thanks...
@rayanmartowikromo4527
@rayanmartowikromo4527 4 года назад
first all thank you for the helpful video.Did helped me. second tank you for speaking english and not like other indian making great video but speaking hindi .how the hell would the rest of the world understand ? so thank you sir
@TechStudyCell
@TechStudyCell 4 года назад
It's my pleasure
@jackrichards1863
@jackrichards1863 Год назад
​@@TechStudyCell I am certain that fellow meant 'Second, thank you...' rather than 'Srcond tank......' good instruction. Quickly told us what to do and all about it. Great work, no confusion!
@user-en8rf4cp2x
@user-en8rf4cp2x 5 лет назад
I don't hate you u r a great man
@tarekgagigi3097
@tarekgagigi3097 Год назад
You are honest, clear, and professional. Thank you
@TechStudyCell
@TechStudyCell Год назад
I appreciate that!
@simpliciocamirino2271
@simpliciocamirino2271 2 года назад
Thank you for that sharing sir.
@surajrisingsun7037
@surajrisingsun7037 6 лет назад
very nice .......
@TechStudyCell
@TechStudyCell 6 лет назад
Thanks...
@febiankasongo1297
@febiankasongo1297 4 года назад
Great vid like it 👍.
@TechStudyCell
@TechStudyCell 4 года назад
Thanks
@ugurbayrak9869
@ugurbayrak9869 6 лет назад
could you please explain third method (or please refer to link explaining etc...)? how capacitor is charging without a source ?
@KesienaBrown
@KesienaBrown 5 лет назад
The multimeter has a souce. Recall to measure resistance, you need v=IR, so the resistance of the capacitor increases with increase in charging and vice versa.
@sanjayseal7519
@sanjayseal7519 2 года назад
I have a Crompton water pump of 1 hp, recently I replaced the capacitor with same MFD but my previous capacitor has two terminal or wire in it and the new one which I purchased has 4 terminal, can in install it to the new one?
@MEP.ENGINEERING.WORKS92
@MEP.ENGINEERING.WORKS92 2 года назад
Good work brother
@TechStudyCell
@TechStudyCell 2 года назад
Thanks
@shrikeshbhaipatel4137
@shrikeshbhaipatel4137 7 лет назад
nice
@junaidalam5745
@junaidalam5745 Год назад
Very good knowledge you shared
@simpliciocamirino2271
@simpliciocamirino2271 2 года назад
thank you for that sharing sir.
@rs4912
@rs4912 11 месяцев назад
Hello. 😊Thanks for the good explanation. I have a question. I am going to replace a capacitor on a power generator, and am wondering if a normal starting capacitor can be used for this, or if there are special capacitors for generators? ( 18uf 400 - 450 volts 5% 17-10 w ) Thanks
@yellowbulb1308
@yellowbulb1308 6 лет назад
Good video
@TechStudyCell
@TechStudyCell 6 лет назад
Thanks
@northstar2782
@northstar2782 6 лет назад
Bravo
@luigicaneri122
@luigicaneri122 6 лет назад
Northstar 27 come installare power director
@cyrusaraza1720
@cyrusaraza1720 2 года назад
Sir may I ask, if I have a motor starting capacitor for "Dough Mixer" of 80µF 10+20% 270V, and I have a reading of 85µF, shall I say that the capacitor is in excellent condition?
@emmettcoen
@emmettcoen 7 лет назад
Nice video.. I need help :( I have a power washer, it was humming on start and not running, I had a larger capacitor in garage and changed it over, motor ran for a minute and blew up capacitor, it was rated over double uf.. Is it a start or run capacitor? There is only one so I assumed it was a start,.. I will send link to power washer pdf parts :) thanks if you can help
@TechStudyCell
@TechStudyCell 7 лет назад
If no centrifugal switch connected in series with the capacitor then the capacitor remains connected during running period. Please always replace the capacitor having the same rating (uf must be same, voltage and temp can be higher or same) for both start and run capacitors.
@saifulislamtipu3144
@saifulislamtipu3144 6 лет назад
nice
@neatt3815
@neatt3815 3 года назад
I have a portable air conditioner that doesn't work. I have removed the start capacitor and tested the resistance and it's on overload no matter what ohm setting I put my multimeter on. I have tried charging it, and discharging it and it's always the same. Is it safe to assume the capacitor is dead?
@sivanagarajukillampalli5872
@sivanagarajukillampalli5872 6 лет назад
Sir minilec wlc d1 connection to the submersible starter diagram
@mikr1334
@mikr1334 7 лет назад
You can charge capacitor by use a diode for high voltage. In this way you can charge at max voltage all the capacity.
@TechStudyCell
@TechStudyCell 7 лет назад
yes. but I have tried to show the testing of a start capacitor without any component and tools.
@mikr1334
@mikr1334 7 лет назад
Yes, I understand this, but you don't will have never the total capacity and so if the capacitor is very good or less.
@jayryan7473
@jayryan7473 4 года назад
@@mikr1334 You really don't understand.
@dzmalekvali1110
@dzmalekvali1110 5 лет назад
SAFETY is number 1 I see..
@SunilSaini-in4vr
@SunilSaini-in4vr 5 лет назад
UV suspicious toxic cup goncff
@avp192
@avp192 5 лет назад
I think its better you use a resistance in series while connecting in mains and discharging
@bharathiraja6066
@bharathiraja6066 4 года назад
Sir how to choose the capacitor in single phase motor and three phase motor in 2 phase condition adding of phase shifting
@danzelwesingtone7413
@danzelwesingtone7413 2 года назад
nice tutorial brother very good help
@sangtaobuzz
@sangtaobuzz 4 месяца назад
Rất tốt, đã đang ký kênh.
@pclalhriatpuia984
@pclalhriatpuia984 4 года назад
Excellent
@mohmmadmahmood8564
@mohmmadmahmood8564 7 лет назад
it is OK
@andresong9704
@andresong9704 4 года назад
5%+/- deviated does it means i can no longer use them if it is higher by 5% micro farad from the stated?
@bixenbaer
@bixenbaer 3 года назад
Of course you can use it. It s just the error margin as specified by the producer.
@komoxbugai8251
@komoxbugai8251 3 года назад
Helpful
@crviswanathan4293
@crviswanathan4293 4 года назад
good video
@normanpaxo4475
@normanpaxo4475 5 лет назад
Thumbs up for anyone encouraging poking bare wires in a plug socket. Who needs a multimeter. Your balls are BIG
@spicky2966
@spicky2966 3 года назад
4:55 is it 200k ohms or 2000k ohms pls i would appreciate it i need to test a 45uf capacitor..tks
@leedevries5660
@leedevries5660 5 лет назад
It should be realized that when applying a capacitor to AC mains and removing it, there will be a DC voltage present. The size of the voltage will be determined by when the supply was removed in the AC cycle. It could be anywhere between 0 and +/- 340V DC ( as the peak DC voltage is 1.414 times the AC RMS voltage, My method is to connect the capacitor to a IEC lead, plugging it into a power point and switching the power ON and OFF briefly. I then remove the lead from the mains supply & I measure the voltage with the multimeter and look for a voltage >300 Volts. Discharge the capacitor by short circuiting it and repeat the process several times for voltage >300 Volts. Then measure the voltage every 5 minutes or so & if the capacitor is still charged to the same voltage, you have a good capacitor. If not it is leaky to some degree and should be replaced. Discharge the capacitor before removing it from the IEC connector! I don't think we should be showing anyone "poking things into power points directly" If you do this sort of testing a lot, make up a lead with insulated alligator clips (sometimes know as a suicide cord), but do not leave it lying around!
@zubairkhan6937
@zubairkhan6937 4 года назад
I am agreed.
@zubairkhan6937
@zubairkhan6937 4 года назад
What about this if we connect the capacitor in series with 220 volt A.C bulb of 60 or 100 watt?
@unnikrishnanchevidan8243
@unnikrishnanchevidan8243 Год назад
what is the meaning IEC lead.
@anthonystar
@anthonystar Год назад
Dude really brave wtf don't get shocked :)
@engrsaifulsaif
@engrsaifulsaif 4 года назад
good video. this is my PLC base channel and its electrical base channel
@MrGarcon98
@MrGarcon98 4 года назад
good job
@TechStudyCell
@TechStudyCell 4 года назад
Thanks
@cwmrypsbudget9646
@cwmrypsbudget9646 5 лет назад
Very good video
@TechStudyCell
@TechStudyCell 5 лет назад
Thanks 😊
@shuvendupattari8079
@shuvendupattari8079 7 лет назад
nyc
@VeganBytes
@VeganBytes 3 месяца назад
Thank you for the video. I also have the 4 pin type, it's a cbb60 for a MacAllister COD2000FLS tablesaw. After testing the cap, it seems to be okay, it's holding and releasing charge perfectly. Looks like I need a new saw 🫠 Leaving the brand and model number here for owners who run into the same issue, so let's hope Google search leads them here 👍
@nickjalbuna3786
@nickjalbuna3786 4 года назад
How about polarity capacitor if there is negative and pacitive like 50 Volt ,100 uf
@TechStudyCell
@TechStudyCell 4 года назад
Please refer the following video for accurate testing. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-QWCLPfIrp-4.html
@davidfildes9826
@davidfildes9826 4 года назад
Buy a new one.. you can test the old won using the continuity on your VOM to charge and test. Apply leads then reverse you should see a voltage kick if still good...
@majed9r
@majed9r 4 года назад
5:53 increasing not decreasing !
@progaming3560
@progaming3560 3 года назад
Very useful
@TechStudyCell
@TechStudyCell 3 года назад
Glad you think so!
@PRNadh
@PRNadh 6 лет назад
Please note that, while doing this, I suggest that capacitor not to be connected directly even little time, since we want check capacitor is Ok or nor, there may be open or short internal, it should be always to be connected one series lamp with this, so the test will be safe, if not incase short, it will explode with no time.
@chongshenchang9367
@chongshenchang9367 3 года назад
What is the voltage of the buzzer..?? Since the capacitor is of high voltage.
@wernerhorne5354
@wernerhorne5354 Год назад
Thank you.
@engineert.r.t1983
@engineert.r.t1983 3 года назад
Nice video
@obaego9787
@obaego9787 Год назад
Please can I change the capacitor of a summersible control box with a higher one with higher microfarad?
@MuthuKumar-oi5vk
@MuthuKumar-oi5vk 4 года назад
Which place I want purchase this type of multimeter... please help me?
@Eeropolvasti
@Eeropolvasti 3 года назад
Good video, thanks! One question: when you measure, and connect back capacitor, can wires be in either location: there is no "plus and minus" connector, either way capacitor works !!!??? Thanks, youtheman =)
@TechStudyCell
@TechStudyCell 3 года назад
This is a AC capacitor, so there is no positive and negative terminal
@Eeropolvasti
@Eeropolvasti 3 года назад
@@TechStudyCell So, you can check it, or connect it either way, right??
@mohamedsaad6506
@mohamedsaad6506 2 года назад
ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-YGSHcyWju9c.html
@brslst5645
@brslst5645 2 года назад
@@Eeropolvasti yes, correct. There is no +/- on the capacitor
@peterfrancis3865
@peterfrancis3865 4 года назад
Thanx
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