Learn how to test Optocouplers/Opto-isolators with multimeter

[@xhulilleshi]

the most clean explaining ever 💯❤

[@electronicsrepairbasics_erb]

Appreciate that

[@fredb1130]

I think I'm going to enjoy your channel. This was helpful to me. Thank You.

[@electronicsrepairbasics_erb]

Glad it was helpful!. You are very welcome.

[@success_road999]

HELLO YOU HAVE VERY GOOD ENGLISH AND EXCELLENT EXPLAINATION MY CONGRATULATION ALI FROM TUNISIA GOOD CONTINUATION JE SUIS TRES COMTENT انا سعيد جدا بهذا التفسير الرائع

[@electronicsrepairbasics_erb]

Thank you Ali, I appreciate that,

[@awaisahmed5537]

Very helpful video tutorial sir...

[@electronicsrepairbasics_erb]

Thanks and welcome

[@cjeyrock]

what a great channel.

[@electronicsrepairbasics_erb]

You are welcome C jey Rock

[@kakysamir9681]

Thank you for the video

[@electronicsrepairbasics_erb]

Thanks for watching!

[@rolanddejesus8685]

thank you very much,your the best teacher...god bless.

[@electronicsrepairbasics_erb]

You are welcome!

[@alamin-vv4mx]

Thanks a lot. Very much helpful.

[@electronicsrepairbasics_erb]

Glad it was helpful!

[@vikramtrivedi5468]

Thank you Sir

[@electronicsrepairbasics_erb]

Most welcome

[@dzabakwesi2213]

Thanks for the knowledge. Very helpful

[@electronicsrepairbasics_erb]

Glad it was helpful!

[@jumbo999614]

I use 4n35 and Arduino analogRead on signal from pin4. Pin5 receive 5v from source and pin4 is connected to 3mm led with 330ohm resistor. Even pin1 and pin2 are turn off, I still can read value around 100 ~ 400 on pin4. I thought it should read zero. Why is that?

[@kruk-tv]

Hi Sir , I'm still learning. I'm testing a Schottky Diode 1N5819 in circuit .the reading is 0.2v and the reverse is 0.4v . The diode is good but I'm not sure why it read in reverse bias. does it mean some part in the circuit causing a short ?

[@chinnarao326]

Resp Sir! Very Excellent Vedio Sir. Thank U Sir. -- Chinna Rao

[@electronicsrepairbasics_erb]

So nice of you

[@theprogrammerrolandmc3039]

Remember to check the data sheet very important this test does not apply to every IC example 4N35 right up to ic 4N37 have 4 emitter 5 collector 6 base they all show a reading as they are all connected. I would love to see a video on data sheets and how to understand the input out to understand how to take measurements.

[@electronicsrepairbasics_erb]

Great point! Noted

[@aymanfaroukhamed999]

you are Great thank you very much 👍

[@jashimuddin7355]

Nice video.... sir

[@UpInSmoke54]

What reading is displayed on the screen? Millivolts?

[@electronicsrepairbasics_erb]

Sorry I don't understand what you are saying.

[@francislopes7741]

Very nice Vedio

[@tnamen1307]

Please explain why DIODES are not present in car automotive relays? It is a fact that diodes serves as protection against the back emf voltage from the relay coil.

[@UpInSmoke54]

Some relays do have diodes.

[@tnamen1307]

@@UpInSmoke54 please explain what diodes are not used in some car automotive relays. I'm really confused.

[@electronicsrepairbasics_erb]

If they are not present doesn't mean there is no protection, ther are other components that can protect the car circuits.

[@ameerhavi364]

Hi sir

[@Giorgi-1881]

👍👍👍👌

[@seemakhalidseemakhalid352]

Very nice Guide Thanks a lot,s Respectable Sir. Muhammad khalid khan Electronic Shope Clifton karachi.

[@electronicsrepairbasics_erb]

You are very welcome, New awesome videos every day

[@kophyoaung5627]

❤❤❤

[@shastrichandoo817]

I have tried this method on numerous boards and it does not work. The only way it works is when i remove the optocoupler from the board and then test. I was misled from your video when i thought that my optocoupler was bad only to realize that it tested good once desoldered from the board...can you provide an explanation

[@davidybester2371]

Ive found that other components (such as capacitors, iductors, transformers etc.) in the circuit cause the multimeter to read different values, as they are all interconnect. This causes the multimeter to read the resistance across those components as apposed to across the component I want. This phenomenon can occur when measuring resistors aswell and cause really inaccurate results. I find that it is good practice to desolder atleast one leg of the component to make sure that the mulimeter is only measuring the component I want to measure and not picking up other random components instead.

[@BJcanal270]

Totally agree with you. Best way is to remove it and used two Multimeters

[@ameerhavi364]

Allah bless you

[@gillanland]

You can't reliably test optocoupler that way when it's connected to the circuit!

[@garthlane4070]

If you say that you can't, don't you think you should say why?

[@Manticore1960]

Testing the collector-emitter junction like that isn't good enough to show that it's definitely OK. All it does is show that it's not short. An optocoupler could be damaged in a way that the collector-emitter junction goes genuinely open circuit, so your test would show it as good, when it's actually bad.

[@ernieschatz3783]

I would think injecting the rated voltage into the LED would cause a change in EC resistance. Agreed that many of this guy's tests are not the most comprehesive, but they can help people to get started.

[@BlueWing2909]

tks dude!! you may speak faster!! time is money for us!!😆

[@joseffist9366]

This test is not enogh to test opto

[@ahmednor5806]

🙏💐💐