Author Topic: Device tester for Photocoupler  (Read 1246 times)

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Offline firasTopic starter

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Device tester for Photocoupler
« on: July 01, 2019, 05:48:19 pm »
Hello. Is there a  tester device to check photocoupler (moc3023.TLP250.TLP3023.IL420.4n35.....etc)
 

Online Zero999

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Re: Device tester for Photocoupler
« Reply #1 on: July 01, 2019, 07:40:56 pm »
As far as I'm aware, there's no off the shelf device to test all of those opto-couplers, but it should be trivial to build a test circuit.
 

Online Stray Electron

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Re: Device tester for Photocoupler
« Reply #2 on: July 01, 2019, 07:56:14 pm »
  I'm not familiar with those numbers (and I'm not going to take time to look them up) but I've seen Tektronix curve tracers used to test opto-couplers.  I think Tektronix covered testing them in either one of the user's manuals for one of their curve tracers (probably the 575 manual) or in one of the series of small books that they printed regarding different types of test equipment and electronic measurements.
 

Online Zero999

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Re: Device tester for Photocoupler
« Reply #3 on: July 01, 2019, 08:26:33 pm »
  I'm not familiar with those numbers (and I'm not going to take time to look them up) but I've seen Tektronix curve tracers used to test opto-couplers.  I think Tektronix covered testing them in either one of the user's manuals for one of their curve tracers (probably the 575 manual) or in one of the series of small books that they printed regarding different types of test equipment and electronic measurements.
The original poster listed a wide range of opto-couplers with: basic BJT, TRIAC and MOSFET driver outputs. I've never used a curve tracer, but I imagine it's most suited to diode and BJT output varieties.
 

Offline Jwillis

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Re: Device tester for Photocoupler
« Reply #4 on: July 02, 2019, 03:17:08 am »
There are IC testers available for checking opto couplers  for around 30 dollars.I can`t tell you how good they are but what do you want for 30 bucks.The IC tester demonstrated is at around 17:55. Check it out.
 

Offline firasTopic starter

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Re: Device tester for Photocoupler
« Reply #5 on: July 02, 2019, 05:06:52 pm »
This device does not work
 

Offline Seekonk

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Re: Device tester for Photocoupler
« Reply #6 on: July 02, 2019, 05:51:37 pm »
I should try this with my cheap $10 component tester.  Wire up a socket so the LED looks like a base (1). The other end of the LED (2) ties to emitter (3).  Collector (4) is the collector. It will look like a funky transistor with Vf and some gain.
 

Online wraper

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Re: Device tester for Photocoupler
« Reply #7 on: July 02, 2019, 06:01:36 pm »
I should try this with my cheap $10 component tester.  Wire up a socket so the LED looks like a base (1). The other end of the LED (2) ties to emitter (3).  Collector (4) is the collector. It will look like a funky transistor with Vf and some gain.
It can work as sort of BJT if it has transistor output but very poor gain, usually below 1.
 

Offline David Hess

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Re: Device tester for Photocoupler
« Reply #8 on: July 03, 2019, 03:19:48 am »
I'm not familiar with those numbers (and I'm not going to take time to look them up) but I've seen Tektronix curve tracers used to test opto-couplers.  I think Tektronix covered testing them in either one of the user's manuals for one of their curve tracers (probably the 575 manual) or in one of the series of small books that they printed regarding different types of test equipment and electronic measurements.

It would not be difficult to use any bipolar transistor curve tracer to test an transistor optocoupler.  Wire the cathode to the emitter/source and you have a three pin bipolar transistor equivalent with a current gain from about 0.1 to 1 depending on the current transfer ratio.
 


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