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Old 03-28-2011, 01:30 AM #1
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Default Multimeter is not reading Current

Hello, I started trying to assemble my first laser not too long ago. However, almost immediately after beggining to work on it I encountered a small problem. I bought a Rkcstr microdrive rather than make my own for conveniece sake. Soon after figuring out how to set the current on the driver I tried fitting it all inside an Aixiz module. I saw that it didn't fit and so i took it apart and kept trying to resolder it over and over until it could fit inside it. Anyways, after accomplishing that feat I put on my goggles turned on the laser and pfft, nothing happened, I'm assuming I fried the diode. So I decided to check for the current setting on the driver and this time it gave me a reading of 0. No matter how many times I tried fixing it, it kept giving me a reading of 0mA. So I figured out that I probably burned the little thing after so much resoldering and whatnot. I waited a week for my second driver to arrive, this time I did a MUCH better job putting it together. I connected the driver to a battery, proceeded to set the current but to my surpise, no matter what I do, It still reads 0mA. I guess I could have possibly fried this one too, but I'm extremely sure that I did not solder the ends for more than 2 seconds each!

I tried checking current this time with just a resistor connected to a battery and the multimeter and it still gave me 0mA, which obviously can't be true. So i'm led to believe that the Multimeter is broken =( . However, why would every other function work, except the one that checks for current? Or did I really just fry two drivers? Any thoughts or ideas to what could have happened are greatly appreciated. Thanks.


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Old 03-28-2011, 01:36 AM #2
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Default Re: Multimeter is not reading Current

You should be using a Test Load, and the meter is set to mv not ma. With a 1 ohm resistor on the test load 1mv=1ma..that's how you read and set the current. Please read up in the Drivers and test load section.

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Old 03-28-2011, 01:37 AM #3
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Default Re: Multimeter is not reading Current

Thank you, I'll go ahead and read the stickys in that section.
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Old 03-29-2011, 08:29 PM #4
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Default Re: Multimeter is not reading Current

Also did you check whether the fuse is blown on your multimeter? Happens quite a bit when measuring current.
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Old 03-29-2011, 08:55 PM #5
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Default Re: Multimeter is not reading Current

Hmm, no I didn't check that. Maybe that's another step I should take haha. Thanks for the tip.
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