Test optocouplers - Electronic Circuits Projects Diagrams Free

Gregory · 22nd April 2008, 10:53 AM

Could you explain how to test a optocouplers.
Greg

Papabravo · 22nd April 2008, 03:13 PM

1. Connect a voltage source through a current limiting series resistor to the input.
2. Connect a pullup resistor to Vcc
3. See the output go low

What could be simpler?

tians · 22nd April 2008, 08:19 PM

I'll tell you my method

1. Find the input if you barely don't know which one is input.
2. Use avometer as ohmmeter to check which one is short for each pins.
3. Ohmmeter is work as current source so when you find short one then it is the pair of input pin.
4. Power up the input with series resistor.
5. Measure the output which one is short so you now know how the current flow.
6. When you power off input that output pins become open.

Your optocoupler is work.

Dean Huster · 23rd April 2008, 04:02 AM

It's really fascinating to put them on a semiconductor curve tracer. The emitting device goes to the base input circuitry and the output transistor to the usual emitter/collector circuitry.

Dean

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22nd April 2008, 10:53 AM	(permalink)
Gregory	Test optocouplers Could you explain how to test a optocouplers. Greg

22nd April 2008, 03:13 PM	(permalink)
Papabravo	1. Connect a voltage source through a current limiting series resistor to the input. 2. Connect a pullup resistor to Vcc 3. See the output go low What could be simpler? __________________ We never have time to do it right; but we always have time to do it over.

22nd April 2008, 08:19 PM	(permalink)
tians	I'll tell you my method 1. Find the input if you barely don't know which one is input. 2. Use avometer as ohmmeter to check which one is short for each pins. 3. Ohmmeter is work as current source so when you find short one then it is the pair of input pin. 4. Power up the input with series resistor. 5. Measure the output which one is short so you now know how the current flow. 6. When you power off input that output pins become open. Your optocoupler is work. __________________ http://fun-digital.blogspot.com/ Fun Digital Blog - Programming Digital Electronic is Fun

23rd April 2008, 04:02 AM	(permalink)
Dean Huster	It's really fascinating to put them on a semiconductor curve tracer. The emitting device goes to the base input circuitry and the output transistor to the usual emitter/collector circuitry. Dean __________________ Dean Huster, Electronics Curmudgeon Contributing Editor emeritus, "Q & A", of the former "Poptronics" magazine (formerly "Popular Electronics" and "Electronics Now" magazines). R.I.P.