How to Test MOSFET transistor using Multimeter by some easy methods
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- เผยแพร่เมื่อ 27 พ.ค. 2024
- In this video, I have explained some methods of checking MOSFET transistor using a multi-meter.
The method is shown here for testing MOSFET is very easy. Here have used Enhancement N-channel MOSFETs (IRF832 and IRFP250N) to explain how to test MOSFET.
I have also explained How to identify the 3 terminals (Gate, Drain & Source) of MOSFET.
1st method:
In the first method, after you have identified the Gate, Drain & Source terminals of MOSFET, you can check the MOSFET in off state by connecting the black lead to the source terminal and red lead to drain terminal in diode testing mode. You should not get continuity between the source and drain at off state for Good MOSFET.
Then you have to charge the gate terminal and check the MOSFET at ON-state.
2nd method:
In the second method, we will check the MOSFET with the help of a simple circuit. I this method we will turn on and turn off the MOSFET and also control the Drain to source current by varying gate to source voltage.
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Brilliant simple to understand presentation. The presenter quickly comes to the point and walks you through the process without wasting any time. A very good gifted teacher indeed!! The minute I finished watching the video I quickly clicked on the "Like" and "Subscribe" button.
I like how you trained us ,you are a good teacher . I understand firmly
Thanks for your feedback sir 👍
8d)d-)?d-,s9-9e9ekdk:e)39e)e8)8:jekkske
Just had a mosfet problem... perfect test solved all questions. thank you!
Thank you for the excellent explanation of how to quickly and easily understand how the MOSFET works and how to test it.
Thanks for a good description, looking forward to many such videos
Thanks for the feedback...
Bro, you did great!!! Straight to the point..and no grammers!!! The explanation on the design of the MOSFET is superb!!!
Good , well explained . Thanks for sharing. Please keep up uploading electronics related videos.
In your test circuit,can't see how you get a negative reading on your DVM. +ve terminal of DVM is connected to G terminal of Fet (10kpot wiper).If pot set to bottom . Wouldn't it read 0 volts and then only go +ve as pot is increased?
You are absolutely right.
Well done !
Provided one is grounded properly, preferably with an anti ESD wrap.
Some of these MOS devices get zapped pretty quickly otherwise !
Thanks 😊
You've never been to India, there's so much humidity there static electricity is not a problem.
@@rsattahip When I accidentally discharged the lead on my failed Motor scooter control unit, I got a large spark. Those Mosfets can store a charge for a long time and more than once. I would short them with a 1,000 Ohm resistor just in case from now on.
Ur demonstration ever ever very usful, and practical &theoritical big thanks
Thanks
Excellent video, very well put together by you. Easy to understand with the schematic and the two meters showing the operation of the MOSFET.
great demo and explanation the best i have seen please do more
+PBS #007
Thanks
th-cam.com/video/CDd4La5DFx4/w-d-xo.html
I agree it was very clear and easy to understand, thank you @tech studycell
awesome technique, never in my mind before. thanks for share!
You r welcome
Thank you very much for this fine video. It helped me diagnose 2 out of 4 BS170 MOSFETs bad on my radio.
Very nice presntation - clearly explained and nicely demonstrated. Probably worth pointing out that the negative lead of some multimeters (particualrly the older analogue meters) have the black lead connected to the POSITIVE of the internal batttery. Also this will only work if the diode test position give a positive voltage of at least 5 V (normally - some may require a higher voltage)
´s8´zke8k3s
Excellent explanation & practical demonstration - cleared many basic doubts - keep making such informative videos - thanks
You are welcome
Thank you for your time making this informative video, I am repairing inverter now, this video help me understand the use and how this work.
Love your tutorial. Do you have a video for the PNP mosfet?
Excellent video for checking the mosfets. I am diagnosing a Samsung tv power supply board. Great help. Thanks again.
Glad it helped
Hello my friend I have a question for you when you have only voltage between Gate and the Drain and you test the continuity between source and drain without voltage ! does it beep ?
This was so helpful. Thank you so much!
You are welcome
thanks! make more videos please. It help a lot of people.
Sure. Thanks for the feedback
good video. ive never seen like this video simple and easy. thanks.
Thanks
Fabulous! You're a great teacher. Thank you very much!
Welcome
Thank you fro uploading. Like the explanation. Simple, straightforward!
Welcome
Thank you, super handy information which I've just used to identify a faulty MOSFET.
Thanks for the feedback
@@TechStudyCell can u show us P channel also ?
Can I test the transistors 2SK2221 G/S/D when they are still in the amp unpowered of course? They all test 375/1750. Guessing the caps are blown.
Great tutorial sir. Simple and easy to understand. Thank you!
Thanks
You are a great teacher my friend! Thank you
You are welcome
informative. thanks
Danke für das schöne Video.
Bitte machen sie für uns noch mehre Videos.
Liebe Grüße aus Deutschland
WOW thank you This was perfect and very clear video!!! Love it! Thanks
Glad it helped
Thanks for the lesson.
You are welcome
The best mosfet explanation I seen. Thank you
Welcome
Very well explained. Thank you.
Thanks for the feedback.
Excellent tuition. Very easy to understand. Many thanks.
Welcome
Good video for basic testing. Can you show how to test the maximum current of the mosfet, as per data sheet?
sir if i set multimeter into ohm example X1 or X10 then test the negative pin to source and positive pin to drain are they the same result in diode setting? pls. reply thanks
Excellent, Thank You, very easy to understand!
Thanks
Very good video..simple,easy to understand...
Thanks for the feedback...
nicely explained.
thanks for your help friend, this is exactly what i needed to know...Creator bless...doug (canada)
Thank you for explaining. It was very helpful!
In testing/checking
MOSFETs using Multi-meter, when the gate is charged, why some MOSFETs
(N-channel & P-channel), the drain to source let us say 0.002 or less,
others starts with more higher like 0.435 and running up as fast as a second or
half a second until showing infinite? What does it mean? Does all MOSFETs
behave like that?
I was wondering if someone could teach like. Look what I found. Thank you very much. Can you please make some videos about mother board chips the same way thank you
Excelent, it helped me a lot!
Thanks for the feedback...
Good video but I have a question, I have a clamp meter 266FT with no diode test mode but it has ohm test labeled 2M, 20K and continuity test labeled 200. Can I use it to test Transistors? Or I should purchase another multimeter
Thank you man for make me understand
You are welcome.
@@TechStudyCell Thank you too. I have a better understanding of them thanks to your lecture, clean drawings, and good slow speaking voice.
Thank you for the very clear explaination.
Welcome
Damn, THANK YOU For The Video! It DID Teach Me Good Tips ..
Welcome
Thats a real good trick! Thanks for sharing!
I will run some tests but here is my question to confirm my results. by reducing gate voltage you reduce current from drain to source, does this reduce voltage from drain to source also? I assume not. I'm excited to apply these MOSFETs to my project to eliminate bulky relays and have a safe circuit by limiting current. Way cool! I'm still trying to find the most reliable way to have dedicated 6v current to one circuit and 12v current to the other circuit from the same 12v supply. Any advice would be appreciated.
Do you know were I can get tubes for a texas star liner ?
Well done.Thanks.I wrote notes of it for future.Waiting for further videos.
All the best
very good presentation , thank you ..
You are welcome 😃
E
Thank u for this tutorial & sharing ur knowledge. Keep it up!
Welcome
Nicely done! I got more out of your 3 minute video than 1 hour of reading. I am going to use your test circuit to match mosfets. So simple! For a given input I can swap mosfets and compare their output. For P channel mosfets I can reverse the polarity. I want to balance them for audio output devices. Thank you!
Glad it was helpful!
How IRF1404 is it the same test? Thank you
Very good instruction to check mosfet.
Thanks
thank you can i do this when mosfit is in board?
Thanks for sharing
+colutuber
You are welcome...
Helped me to get my brain going again on fets. Im busy to do fault finding on small invertor so now i can make sure wheter my fets are ok or not. Thx for video
5:32 The voltmeter is displaying -8.21 V. If the meter was connected between gate and source, it is impossible to show such value. The only possible way for the meter to display such value is when the meter is connected between gate and drain.
Yes.
The V meter reading goes from -8.24V to +4.86V = 13.1V quite a trick with a 9V battery!
The voltmeter is reading between whatever voltage the variable resistor is set to, and the voltage swing between the 100ohm resistor and the MOSFET.
Symmetrical supply, +9 0 -9 he didn't show us the picture , battery is hidden
@@Blue.star1 But there is only one 9v battery in the circuit diagram.
@@johndoggett808 watch carefully the wiring , may be no 2nd 9v batt. is there, how can we get - v unless he connects reverse measuring across somewhere else , he might have connected reverse as mosfet switches at -5 V
@@Blue.star1 I agree with Walkalone. When the MOSFET is off, the Meter’s + terminal is at about 0.8v (the Gate (0.8 = 9v - the 8.2v meter reading)). And the negative voltmeter Terminal is at +9V via the 100ohm resistor.
When he turns the gate voltage up to 3.5v (9v-5.5v at 6:06) the MOSFET starts to turn no. After this the negative terminal of the volt meter is on the voltage divider between the 100 ohm resistor, and the partially turned on MOSFET.
At 6:13 he turns the gate voltage to its highest value, and the MOSFET is pulling the negative voltmeter terminal down the 0v, and the positive voltmeter terminal is the gate voltage.
Gud job .. thanku
And pls explain the characteristics of Power MOSFET
Congratulations, very instructive video !
Thanks
hi from one newbie. i want to test the item sg60n03p.
what should i expect in first and second direction on D S? i see diode between D and S
superb session
Akhil Raj s
very nice and practical video ! can a IRF3710 mosfet replace an FET (SK2543) which has burnt ? thanks !
muy practica la prueba de conduccion del mosfet.....
Excellent video.Thanks.
Welcome
ooh excelent thank you
You are welcome...
Can I check lm 317t in the same way?
I have 6 pins on my laptop mosfet..do they run parrallel to the other side?
Brilliant tutorial, thank you!
Welcome
great tut
Is it always that multimitere supplies enough to gate to switch it on, or need to supply higher voltage for some
Thank you very much for help me.much appreciated,was the best.
very good video , helpful and instructive ! big like and subscribed as well!
Thanks
hello if mosfet measures a reading of 707 in on state is this normal. you reading shows 004
thanks
Where did you buy IRF832 Transistor?
By the way, your handwriting is nice and very neat!
Thanks
Yes dear, you can have a thumbs up 👍.!!
Simple, clear neat without any doubts 🤗👌
Great lesson thanks! But please tell me why a 100 ohm resistor is needed in the circuit and how does one determine what size resistor to use?Thanks very much!
In my electronics class, a 100 Ohm resistor is always used at the Base of a transistor in series with the test lead.
Tnks for the info very well explained
Welcome
I am trying to test a MOSFET using this method. In the ON state, the drain and source show continuity for a very brief duration, like half a second, and then opens again. I am not sure if this MOSFET is faulty of not. Any advise please.
Thanks . Simple to the point .
Thanks for the feedback.
@@TechStudyCell V good explanation. Thanks..😊😊😊
Does this test (to check if mosfet is OK) work if it is still in circuit (but no power connected)?
I like my teacher....I froom Indonesia...Thank you
You are welcome
You nailed it brother. I also have new understanding
nice and clear explanation for beginner level , especially for me. Thanks a lot.
What's the difference between the mosfet health check that I do on my channel and what you do?
Brand new FET. Out of circuit test failed. In circuit test passed. Is it good? I think so. Why does it not work like you showed in the first test?
well done
+ali behrouz
Thank you
Excellent
Nice. Very clear. Thanks.
You are welcome 😊
´&829ksisk
9e)398&)el
what about 8 pins flat mosfets ? is it the same principle ?
Im testing a SVF10N60F and it doesn't behave like this, does it mean it doesn't work? or is it a different kind of transistor?
Thanks for the explanation. Helps a lot. I tried to do the same and got the results as you said. BUT, I tried with two types of AVO meter, one (with 3V supply) could do the test and the other with 9v battery could NOT do the test. The reading showed nothing. Could you please explain why? Thanks .
Very nice. Understood perfectly.
Glad it helped