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Adjusting a driver.

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Laserz4sale

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Hi, I bought a 405nm laser diode and driver and I am not sure how to measure the current output of the driver. Is there any way to measure the current output? Thanks.
 





Toke

Toke

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Yes there are.

(How to do it depends on the driver and how it connects to the diode.)
 
Toke

Toke

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My current connection is rather slow, so no ebay now.

If you cannot measure current directly you can run it through an 1 Ohm resistor and read the millivolt across it as milliamps.
Search the forum for "testload" as you will need one anyway when setting your driver.
 
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Laserz4sale

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Toke said:
My current connection is rather slow, so no ebay now.

If you cannot measure current directly you can run it through an 1 Ohm resistor and read the millivolt across it as milliamps.
Search the forum for "testload" as you will need one anyway when setting your driver.
Click to expand...

Thank you, I have found the schematics for the test load. I will go build one right now. Just a quick question though, what is the tolerance for the test load? +/- how many mA? And also, would it increase the tolerance if I were to use high precision resistors?
Thanks again :)
 
Toke

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I am not sure about how close the diode voltage drop of the testload have to match the diode, in order to set the driver accurately. There are possible low end drivers that require a closer match than others?

As for the resistor value they are mostly +/- 5% which is close enough for this use.

I have not personally experienced any problems/divergence when comparing settings made with voltmeter and then checked with an actual ampmeter.
(I happen to have quite nice measuring equipment. :))
 
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Laserz4sale

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Ok thanks. By the way, would you happen to know where I can get modules to fit my driver? My driver is around 11-12mm wide and cannot fit in the "12mm" housings that are spaced 10mm on the inside.
 
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