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Old 03-16-2011, 11:24 PM #1
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Default Adjusting a driver.

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.


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Old 03-16-2011, 11:38 PM #2
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Default Re: Adjusting a driver.

Yes there are.

(How to do it depends on the driver and how it connects to the diode.)
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Old 03-17-2011, 12:43 AM #3
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Default Re: Adjusting a driver.

Quote:
Originally Posted by Toke View Post
Yes there are.

(How to do it depends on the driver and how it connects to the diode.)
The driver is this one 405nm 100-300mw Laser Diode Driver Constant current - eBay (item 220752802052 end time Apr-10-11 07:01:35 PDT)

My multimeter only measures volts AC/DC, mV, and Ohms.
Please teach me how to measure the output current for the driver so I know how much to turn the pot. Thanks.
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Old 03-17-2011, 01:04 AM #4
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Default Re: Adjusting a driver.

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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Old 03-17-2011, 10:57 PM #5
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Default Re: Adjusting a driver.

Quote:
Originally Posted by Toke View Post
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.
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
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Old 03-18-2011, 02:56 AM #6
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Default Re: Adjusting a driver.

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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Old 03-18-2011, 03:24 AM #7
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Default Re: Adjusting a driver.

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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Old 03-18-2011, 06:50 AM #8
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Default Re: Adjusting a driver.

No I am afraid not, I only know of the 12mm Aixiz modules. You can usually fit a 11mm driver into them, is it possible to shave a bit off the edges of yours?

If not you will have to attach the driver with wires and leave the driver outside/behind the module.
Here is an example where the driver were too long to fit.
Fan cooled 12X in Mohrenberg host.
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App. 300mw MiniMag
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Fan cooled 400mA 12X 405nm flashlight

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532nm 50mW in flashlight

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