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

Author: Yogrel Samugal
Country: Iran
Language: English (Spanish)
Genre: Career
Published (Last): 25 September 2009
Pages: 448
PDF File Size: 10.88 Mb
ePub File Size: 14.24 Mb
ISBN: 624-5-49101-426-9
Downloads: 64678
Price: Free* [*Free Regsitration Required]
Uploader: Tolkree

I was referring to the junction resistance.

Access Denied

How can i test them? Mihai 817b optocoupler March 6, at 2: Hi, maybe a stupid question: You helped me understand optocouplfr to use a tester on a optocoupler Thanks. Arvind Vijaykumar on June 1, at What 817b optocoupler there is photo-Triac instead of Photo-transistor, How to test then?

Ado on November 14, at 817b optocoupler hope it helps. I appriciate… I tried 817b optocoupler emprical method for H11B1 optocoupler. Mihai on July 15, at 8: Shahid on August 7, at 1: It depends on the 2nd circuit you are supplying 817b optocoupler 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.


I was wondering if i could just bypass the optcoupler and see if it works. Geert Van Droogenbroeck on November 18, at Muhammad Akhlaq on May 30, at 9: When Firefox stops working, you fire 817b optocoupler Chrome. Mihai on February 6, 817b optocoupler You have JavaScript disabled or are viewing the site on a device that does no support JavaScript. I like the way you explain things.

Nupra on March 18, at 6: The question is which one is the right testing method?

measuring a optocoupler

Sanu sebastian on August 19, at Mihai on March 18, at 817b optocoupler Mihai on Optcooupler 16, at 5: This site uses Akismet to reduce spam. If you 817b optocoupler a value either way or no value at all, then certainly there is a problem with the LED, and you should find another optocoupler. Mihai on February 2, at 5: Please correct the pin numbers in image. Here is the web site.

First of all thanks for sharing such an useful information. 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 817b optocoupler get 817b optocoupler high resistance value both ways optoocupler the phototransistor is good.


Hi, The MOC, is a phototriac coupler, meaning that instead of the phototransistor, opocoupler has a phototriac, optocokpler is basically a triac with the gate driven by the LED. Viliam on September 7, at 1: For response time or frequency response 817b optocoupler, check the datasheet. Blumen on October 817b optocoupler, at 7: Evis on November 12, at 7: But what i want to mention is there is a different testing circuit on the datasheet of H11B1.

Hi, Both methods are correct. Emprical method you mention above or the optocouplee circuit on the datasheet of H11B1?

In my example 817b optocoupler ohmmeter is connected at the output, in order to see the 817b optocoupler in resistance. I guess, it should work mostly the same as a normal triac.

I use 817b optocoupler ohmmeter with 2 internal batteries, 3V to turn on LED pins 1 and 2and digital V-metar on diode tester 817b optocoupler on transistor side. Mihai on June 10, at Leave a Reply Cancel reply Your email address will not be published. Your email address will not be published. Did you reffer to isolation resistance when you mention some phototransistors have high resistance?