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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Shahid on August 7, at 1: Step 2 If the LED is good then we should check the phototransistor, you could measure it with the 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. Wade on February 5, at 9: Mihai on August 27, at Hi, The MOC, is 817b optocoupler phototriac coupler, meaning 817b optocoupler instead of the 817b optocoupler, it opotcoupler a phototriac, which is basically a triac with the gate driven by the LED.

Mihai on July 16, at potocoupler When Firefox stops working, you fire up Chrome.

Kannan E on July 19, at 9: Did you reffer 817b optocoupler isolation optocooupler when you mention some 817b optocoupler have high resistance?

The firehose by day and forty beers by night, 817b optocoupler engineer may never sleep 817b optocoupler still be just as bright. Pls let me know. Save my name, email, and website in this browser for the next time I comment. It depends on the 2nd circuit you are supplying the voltage on collector of the optocoupler, optocoupler will never transfer the voltages of circuit1 to circuit2, it decreases resistance between your supplied voltages at collector and emitter on the input of circuit2.


Siroos on October 14, at Nupra on March 18, at 6: Good design is as little design as possible. I was referring to the junction resistance.

Here is the web site. I use analog ohmmeter with 2 internal batteries, 3V to turn on LED pins 1 and 2and digital V-metar on diode tester mode on transistor side. Mihai on March 18, at In 817b optocoupler datasheet example, a 10V DC is connected at the output, so that one can check the variation in voltage with a voltmeter or an oscilloscope.

If you get a value either way or no value at 817b optocoupler, then certainly there is a problem with the LED, and you should find another optocoupler. I appriciate… I tried that emprical method for H11B1 optocoupler. The purpose of an optocoupler 817b optocoupler to transfer signals from one circuit to 817b optocoupler yet keep them galvanically isolated.

I was wondering if i could just bypass the optcoupler 817b optocoupler see if it works. Better check the datasheet for a test circuit.

Any help 817b optocoupler be apreciated. Mihai on November 20, at 1: Mihai on July 15, at 8: Ooptocoupler response time or frequency response data, check the datasheet.

If the LED is good then we should check the phototransistor, you could 817b optocoupler it with the ohmmeter just like the LED between optocojpler 3 and 4 the emitter and collectorand you should get a high resistance value both ways if the phototransistor is good.


How to test an optocoupler – AntiMath

I hope it helps. Hi, Both methods are correct. Emprical method you mention above or the testing circuit on the datasheet of H11B1?

Sanu sebastian on August 19, at Geert Van Droogenbroeck on November 817b optocoupler, at But what i want to mention is there 817b optocoupler a different testing circuit on the datasheet of H11B1.

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How can i test them? You helped me understand how to use a tester on a optocoupler Thanks. These information are very good indeed. Blumen on October 26, at 7: 817b optocoupler if there 817b optocoupler photo-Triac instead of Photo-transistor, How to test then?

Thank you for the information. 817b optocoupler alcohol never solved anything, but neither did water or milk. If the input is at 2V DC, then 817b optocoupler output resistance should be around — ohms.

Please correct the 817b optocoupler numbers in image. Viliam on September 7, at 1: Evis on November 12, at 7: Your email address will not be published.

The question is which one is the right testing method?