Optocoupler Tutorial about how Optocouplers and Opto-isolators use light to electrical isolate its input signal from its output signal. Notice The content of data sheet is subject to change without prior notice. In the absence of confirmation by device specification sheets, SHARP takes no. 28 Jun The purpose of an optocoupler is to transfer signals from one circuit to “ Empirical” method Optocoupler test . Thanks for clearity on ic

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Nupra on March 18, at 6: Here I want 817b optocoupler show you how to check if an optocoupler is working.

But what i want to mention is there is a different testing circuit on the datasheet of H11B1. Blumen on October 26, at 7: Thank you for the information. Mihai on June 10, at You have JavaScript 817b optocoupler or are viewing 817b optocoupler site on a device that does no support JavaScript. Sarfaraz on November 8, at 9: Siroos on October 14, at Mihai on July 19, at 3: Wade on February 5, at 9: The firehose by day and forty 817b optocoupler by night, An engineer may never sleep and still be just as bright.

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Mihai on July 16, at 5: 817b optocoupler only have a digital multi meter. Step 2 If the LED is good then we should check the phototransistor, 817b optocoupler could measure it with 817b optocoupler ohmmeter just like the LED between pins 3 and 4 the emitter and collectorand you should get a high resistance value both ways if the phototransistor is good.


I hope it helps. Save my name, email, and website in this browser for the next time I comment. Pls let me know. Optocouplwr my example an ohmmeter is connected at the output, in order to see the change in resistance.

Thank you for optocoupper information… and i have one more clarifications. If you get a value either 817b optocoupler or no value at all, then certainly there is a problem with the LED, and you should find another optocoupler. Geert Van Droogenbroeck on November 18, at In the datasheet example, a 10V DC is connected at the output, so that one can check the variation in voltage 817b optocoupler a voltmeter or an 817b optocoupler.

I guess, it should work mostly the same as a normal triac. What if there is photo-Triac instead of Photo-transistor, How to test then?

Mihai on 817b optocoupler 20, at 1: Thanks for the easy to follow explanation of how to rest an optocoupler. Any help would be apreciated.

How can i test them? For the triac pins 4 and 6with no voltage applied to the LED pins 1, 817b optocouplercheck with an ohmmeter the resistance between pins 4 and 6, it should be high open circuit or 817b optocoupler least greater than 1 megohm both ways, and this resistance should go down lower than ohms when voltage is applied to the LED, and should remain low even if the voltage is no longer present on the LED.


Sanu sebastian on August 19, at Here is 817b optocoupler web site. I use analog ohmmeter with 2 internal batteries, 3V 817b optocoupler turn on LED pins 1 and 2and digital V-metar on diode tester mode on transistor 817b optocoupler. Mihai on July 15, at 8: Some features may not work properly. Mihai on February 6, at The alcohol never solved anything, but neither did water or milk.

measuring a optocoupler

Kannan E on July 19, at 9: I appriciate… I tried that emprical method for H11B1 optocoupler. Your email address will not be published. Emprical method you mention above or the testing circuit on the datasheet of H11B1? The 817b optocoupler is basically a diode, and it should not conduct both ways not get 817b optocoupler on the meter both ways.

Did you reffer to isolation resistance when you mention some phototransistors have high resistance? For response time or frequency response data, check the datasheet. Better check the datasheet for a test circuit. Optocouple correct the pin numbers in image. Arvind 817b optocoupler on June 1, at Hi, maybe a stupid question: Leave a Reply Cancel reply Your email address will 817b optocoupler be published.