How to test microwave HV capacitor using multimeter/ good vs bad
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- Опубликовано: 31 май 2024
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How to test microwave HV capacitor using multimeter/ good vs bad 
Развлечения
Your video just saved me the cost of buying a new Microwave with the ongoing 300% inflation rate in my country, though I fried my new NCV ampere Meter in the process beyond repair (to no fault of yours) I made the mistake of wanting to know the transformer output voltage to the magnetron under load😂 before finding your video. The continuity test position for the capacitor was the magic wand in my case. Replaced and the microwave is now alive after I lost hope in it before.
Thanks for the info.You are on point,I am currently struggling with fixing one after electricity supply company supplied use with 420V instead of 230V.The microwave oven is quite and no display.Now I know exactly where to test.👍👍
Finally a good and simple way to test it but use safty first thanks for the video good job
Thank you for useful information..
Keep it up 😊👍
Thanks sir very informative video thanks from India
feel like somebody is gonna blow themselves up doing this without discharging the capacitor.
😂😂😂
God forbid 🤞🏽
Thanks sir..
Nice to find your video.
Thank you, sir.
Thanks for the excellent video.
Thanks for the informative video
Thanks very good explanation.
Kool video Thanks !
If the capacitor is charged...
Bye bye multimeter
Hi thank you for your wonderful info🎉🎉🎉r
Thanks for making this video now I know my capacitor is what was wrong with my microwave
The capacitor did fix it. But will add that if any of you repair a microwave put ALL the covers on before testing it 😅
Thank you for the video. You omitted something of extreme importance. You may have discharged the capacitor before handling it, but you did not show how to do that. People watching your video may not know that capacitors hold a charge and can hurt you badly. You can't always be sure they have been discharged by the circuitry in the microwave after unplugging it. Also, the new capacitor should also be discharged, just in case someone had bought it, used it briefly, and returned it to the store.
You can find your answer here sir. Please check this out.
ruclips.net/video/xb3nmHEI0Ac/видео.html
thanks for sharing bro....
Good info...
Great video, thanks a lot for creating and sharing your knowledge. I appreciate you
Thanks sir 🙏
Nice and direct to the point instruction!,Great video and thank you for sharing!keep making video!God bless you!
Best of luck
Thankyou ungle.
good job
Thank you bro.
Thank you!
Thank you , sir for valuable information . Nice,simple and understanding way of presentation. Good keep it up. 👍
Thanks
Good
thanks sir👍
Like other youtubers who have made videos on this issue, you have missed the main point. You have proved that your component has 10 megohms of series resistance, but that doesn't prove that it functions as a capacitor. The RC time constant of that capacitor is 1 ufd x 10 MOhm = 10 seconds.
That sets the charging rate. In fact, your ohmmeter only built up to the final value slowly, with a
time constant that looked like about 10 seconds. That's the observation that proves that the capacitor is functioning properly. If the resistance read 10 MOhm instantly, that would have been evidence of a fault.
Good job. You got 101 out of 100 👏
Hi there, what if the value is below 10MOhn? Lets say only 9.2MOhms?
@@abetm2193 9.2 MOhm is fine. Two points: (1) resistors used in this kind of application are typically +- 10% or worse. (2) The purpose of this resistor is to make sure that the capacitor discharges by itself once the charging voltage is removed. If the resistance is 10 MOhm, then it takes a few times 10 seconds to discharge. If it's 5 MOhm, then it takes a few times 5 seconds to discharge. That's OK, too. The problems start when (a) the resistance is very low, in which case the capacitor doesn't even charge up - and could even be shorted out, or (b) when resistance is essentially infinite, in which case it never discharges and remains at dangerously high voltage for a very long time.
Thank you
great vid, but the music is so good its distracting and unnecessary
Super 💖💖
Thanks 🥰
கண்டிப்பாக வாய்ப்பு கிடைத்தால் போவேன். தோழி.
i love your video
Thanks 🙏
Hi,thanks...
Hi thanks for the info. I've been searching for one piece of information prior to messing with the capacitor in my microwave. I realize you need to discharge the cap but I'm trying to understand if it's safe the check the cap with my digital multimeter while it's still in the microwave. I have the microwave unplugged but I want to be able to determine if the cap still has a charge and if so, what the charge is. I'd like to be able to test it with my multimeter prior to discharging the cap to see exactly how much charge it's holding. This is the one thing I can't determine after watching multiple videos and searching the internet. Thanks.
whunt29708 yea I wouldn’t risk that... that’s super dangerous should be about 2000 volts ac if it’s working correctly
Check if capacitors have internal resistor (usually 10Mohm). If yes then you should leave microvawe unpluged for a while and capacitor should discharge itself via this internal resistor. After that it should be safe to test it. However have a look at this site - it provides more information regarding capacitor discharge and danger associated with it: www.repairfaq.org/sam/micfaq.htm#micsafdc
@@dwaynej1s986 thought capacitors stoered dc, not ac
merci pour teste
Nyc bhai
Adventure time thanks bro
Hi... My capacitor does not show the ohms number on its sticker... but when I did test, as you showed, the multimeter quickly shows numbers and thereafter goes back to 1.
I also would like to know, if it's damaged, whether that could have been cause for the magnetron to get damaged?
Do the other tests. If there is no continuity between the terminals & the body then it is ok i guess. And yes this can be the cause of magnetron to get damage.
@@technoboy-allinOne Thanx for your quick response...
I tested, and there's no continuity.
In the beginning of your video you should absolutely make sure that dealing with those high voltage capacitors can kill you. 2100V is no fun to be shocked with!!!
it is if your watching cause I don't know him.
Spettacolare
Hi, is my Capacitor faulty if I can read Resistance (after discharge) only few seconds (values are jumbing from 400 then 200 then 900 and then it is showing infinity => 1. My capacitor is similar as yours -> capacitor has 1.05mF 2100v typ CH85 21105 with 10M ohm.
Which value is jumping?
@@technoboy-allinOne that one on the multimeter, I can not get the values as you in your video from 3:05 to 3:30. In my case values on the multimeter jump very fast and in less then 1 second it is showing infinity 1
If mark value of capacitor is one microfarad and measured value by a DMM is .87 microfarad. Then capacitor is ok or not. Waiting for your kind reply...
Mfd is little bit more or less is not a problem.
hay what happens if when you testing ohm reading goes beyon ohm it'ts rated for, let's say it's a 10 ohm, when you test goes up to 19ohm is it norma??? or not a good sign??
Bot just ohm. Its mega ohm. If it shows much above that then its a bad sign
ok ty@@technoboy-allinOne
Hi Great Vid simple straight to point... However how do check if the microwave not heating food.. Thanks
If microwave is not heating food then start checking from door switch, then start from high voltage diode, fuse and all.
@@technoboy-allinOne thank you I will check
Is 9.72 okay for the mega ohm test if it’s supposed to be 10?
That is ok I think
How long does it take for microwave capacitor to get discharged. If I kept my microwave plug off for a month and open. Does it still have harmful level of current in it?
Not sure. Better use a plier with covered handles and touch both the connectors of the caps few times. That will surely discharge the caps if any charge left.
Ok
sir i have questions. can i use 0.95 uF capacitor in replacement of 0.68 uF? thank you.
Likely yes. But the difference is .27 uf which is not ignorable. So there will be difference in the output.
Hi , thanks for the video. I tested my diode using a 12 volt battery, it shows 8 V and in the other direction 7V . Is is also faulty ?
Greeting from Hungary
When you get same voltage that means it short. Because diode has a resistance in it. When you are getting lower voltage that means diod is ok.
yes voltage in opposite direction means faulty
👋👍🙏
I just want to know if you fix a different voltage capacitor to a microwave will it work or will be blowing fuses
A hundred or 2 wouldnt make much difference i guess.
Continuty? Are you sure it's not conductivity?
when installing a capacitor is there a sequence where the cable goes or can i connect the diode cable to any point?
No polarity
what if the resistance between the two terminals goes up for just a second or so then goes back to Ol, it does not stay at 10M ohms? I think it is bad correct? Continuity test was normal.
Yes its bad
@@technoboy-allinOne Thank you for taking the time to answer my question. It really helps.
It seems as though I do not have continuity between the terminals but in the second step I don't get a reading of having any Ohms(@3:23). Is this possible? And if so I guess my capacitor is bad? Thanks.
Yes if the resistance is not there, then that cap os bad
a bad cap would go towards 0
The 'fautly' one was beggining to go up 052 + when you edited the video and brought it down to 004. I would like to know why please?
Thanks
You noticed that also? Kinda cheesy on his part.
@@johnmacedo4483 indeed
@@johnmacedo4483 John, microwave capacitors have resistance and capacitance.
Cheap multimeters are not reliable for this tests. his statement about not resistance between the capacitors connectors is wrong, but you need a good Fluke
meter to read this resistance. It is about 0.8 to 1 ohm. This internal resistor is to
discharge the capacitor when you turn off the oven. I have a Fluke 87 muiltimeter
that reads this value but my automotive Fluke 375 does not. In is reliable to test microwave capacitor you need an expensive capacitor ESR tester. Igt will give you in one shot the reading of internal resistance and capacitance. Or like me, having a hand good capacitors and magnetrons at hand to test to the units.
if the cap reading 1uf an the resistor bad inside the cap bad, is the cap bad on the whole?
Yes.
I check the impedance but multimeter is very slowly rising and it takes almost 3 minutes to rise 1 mohm, is it normal or is it faulty? (Cont. chk seems ok)
Thats too slow. Think its may work but better to be replaced.
@@technoboy-allinOne thanks for your comment I did replaced the capacitor. However I also suspected my old multimeter and bought an new mm as well and, when I checked the old capacitor it proved to be ok! So one should make sure that the tester is reliable.Just wrote down for information.🙋♂️
What if the resistance starts at 40 megaohms then comes down to 10 megaohms is that good or bad capacitor
Its ok
𝐓𝐡𝐚𝐧𝐤 𝐲𝐨𝐮 𝐟𝐨𝐫 𝐭𝐡𝐞 𝐢𝐧𝐟𝐨𝐫𝐦𝐚𝐭𝐢𝐨𝐧... 𝐊𝐞𝐞𝐩 𝐝𝐨𝐢𝐧𝐠 𝐢𝐭'𝐬 𝐯𝐞𝐫𝐲 𝐡𝐞𝐥𝐩𝐟𝐮𝐥
Can you suggest me which multi meter to use to test capacitor.
Buy a multimeter with maximum resistance selection.
@@technoboy-allinOne for example.
@@petermendonca807 You can not use a multimeter to test a microwave
capacitors because they have resistance and capacitance. The only way
to test this capacitors in a reliable manner is using good capacitor
tester that are costly, with that I mean over $100.00.
@@horaciocastillo1435 thank you for for the good advice. Be in touch.
If I have a value of 117 when testing the terminal against the body, thats means my capacitor is bad, right?
Yeah
how does it show when it got a leak why cant we use capacitor testing mode or ohm mode to test it
Leak caps will show as short, terminal to the body. Caps test mode is not available in all multimeter except some costly ones. So these are the other ways
Mega ohms imean? Pls. Reply ill wait
One million ohms. Mega means one million. The letter K means one Thousand.
Mine ireading 9.95. Is it bad or still good .
Its ok i guess
On bad capacitor the resistance will also rise to 10momh ?
If the resistance is good then. If you have high end multimeter with capacitance tester then you can test the capacitance directly & also the resistance. This is the way to test with basic mutimeter. In most cases resistance also gets effected in bad caps. So you wouldnt get right value.
@@technoboy-allinOne when tested with capacity function don't show anything. We suppose that is because of the build in resistor that is blocking capacitor charging... Idk..
When plugged in with 2A safety the transformer start heating much and smoking after a while.
And now idk what is bad...
When testing transformer coils everything seams to be ok. Except heating coil shows 0.03 and then dropping to 0 omhs. In other people's cases it stayed at approx. 0.03
ভাই দয়া করে জানাবেন ওভেনের পার্টস উত্তরা এলাকায় কোথায় পাওয়া যায়?
plz search on google map
Can we use fix diode any side
Yes
If there is no rdg. About the 10mihms
Sir what if it does not reach 10m ..it only reach 9.89.. its good or bad?
No Its ok. But check the continuity of terminal & the body.
Show a closeup of the multimeter so we can see where your setting is for continuity. I searched the setting on google and they say the OHM is the continuity setting.
Instablaster.
The one marked with sound sign just like this ))))) is continuity
The one like symbol ))))
---|∆. Is right continuity by keeping the selector switch to this position.
Can you connect it to a 12v battery to the inverter
No.
Thank you
My capacitor is not in short. But I get only 1.238 megaohms. My capacitor has 10 megaohms in description. Probably, my fuse was damaged because of it. Could you assure of it ?
Yes its faulty. Thats the 10 megaohm resistance inside the capacitor. If its showing less then the actual value, that means its faulty. Replace it. And also check the diode. Better replace that too.
@@technoboy-allinOne Thank you. I made a simple test with diode. I used three piles and my multimeter. I put the piles in serie and put black wire in the negative polarity (pile) and red in diode (where I put a screw) and the other diode side I put in positive polarity of pile then I got half of electricity of piles (three) and nothing when I inverted the multimeter wires. I used dc voltage in multimeter.
@@technoboy-allinOne I used piles and multimeter. Piles (4,8 v in serie) and I got 2,2 v using multimenter in VDC
Is a microwave capacitor harmless after about 6 mounths?
Maybe. But why to take risk! Just touch both terminals with an insulated pliers to be sure.
My multi meter only goes up to 2M mega ohms. Is there anyway to test the 10M capacitor with it? It seems to start reading and stops within 3 seconds.
Check the capacitor with your multimeter using the capacitance function if equipped. Since your meter maxes out at 2M you are out of luck. You'll need to borrow a higher ranged ohm meter. FYI, the 10M is referring to the built-in dump resistor in parallel with the capacitance. This dump resistor ensures no charge remains across the capacitor terminals after power is removed. I typically don't short out the terminals if I know the unit is healthy. I seldom receive a jolt from caps. These caps don't retain enough energy to harm humans. They will not electrocute humans!
My capacitor shows up to 34MOhm. What does it mean, please.
its too much
i wonder my fuse blown.this is the reason why.
Does anyone think a cut wire to the plug the microwave is plugged in will fry it ? The fuse is good
Think so
Good fuse, good capacitor what are the other cause? Thre is no power?
For no power check the ac cord first. Then check the ac fuse. Then the circuit board.
This high voltage capacitor or the fuse is not the reason for no power. Check the input fuse. Follow the ac cord where its connected inside..
Capicitor ka kitna price hai sar???
Rs. 180/- at local store
what if you get no continuity AND no resistance reading?
Then its faulty too
Magnetorn ka price kitna hai sir
The price starts from Rs. 1200/-
I need a filament to repair my magnetron in my microwave
Most important thing you have not mention capacity has to be discharged
Right. Its just a testing video, so i missed that part. Always need to discharge before touch it.
you are wrong - you need a cap meter - all you did was check for shorts that is not adequate at all
Nowadays most of the good makes have capacitor check facility. For small values these meters are quite good.
I will continuity watch this video for impedance.
Thanks for the "Heart". What's crazy is that I have absolutely no recollection making this comment and can't believe I came up with wordplay so clever.
Gest ngomong jowo iso ora aku gk paham bahasa inggris
appliance.academy
Never ever remove microwave components, always take your oven to a qualified engineer or get a new microwave oven.
yep you are right, if you have no knowledge about electronics then you should not even open any electronics device.
Doesn't work: my capacitor (2kv) leaked blowing the fuse but this test at only 5 volts doesn't show any leakage.
Your test shows a false good.
Only a high voltage test CAN test a high voltage capacitor.
Leaked cap will be short. Cam check with continuity meter, not any voltage
Great video, thanks a lot for creating and sharing your knowledge. I appreciate you
Tahnk you 🙏
Thanks
Good
Thanks