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Old 02-24-2009, 01:58 PM #1
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Default How do I connect, battery/driver/test load?

Hello.
It is my first time I built lasers, I have read and thought I had understood how to connect battery/driver/test load, but my DMM is just stands on 0.00 when I try to measure mA.

So I must do something wrong :-[

Is there somebody that can draw posetiv and negative wire into my drawing or if they have a drawing that shows exactly how everything is connect?

http://www.scrallar.dk/albums/userpi...1/P1020027.JPG

Thank you.
Rasser


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Old 02-24-2009, 04:26 PM #2
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Default Re: How do I connect, battery/driver/test load?

Set meter to volts not ma

Regards rog8811
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Old 02-24-2009, 06:51 PM #3
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Default Re: How do I connect, battery/driver/test load?

Ohh that was why I could not measure anything.

Yes it is set to red LD right now.

I have tried as you have shown
http://www.scrallar.dk/albums/userpi...1/P1020040.JPG

If I screw it all the way down it stands at 0.01 and if I screw it all the way up it stands at 0.26

How do I get that in mV?

Thank you
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Old 02-24-2009, 07:18 PM #4
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Default Re: How do I connect, battery/driver/test load?

How many volts are you using?[edit]I have just looked at your picture, 3volts is not enough [/edit]

You need a minimum of 5v, any less than that and the driver will not work properly, I would suggest 7.2V ( 2 X RCR123A batteries).
Once you have the correct supply going in you can measure the mv as shown through the 1 ohm resistor so 1mv = 1ma.

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Old 02-24-2009, 09:11 PM #5
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Default Re: How do I connect, battery/driver/test load?

Stupid me!
Now I have tried with 2 x cr123 battery's, And I measure from 27mV to 436mV, And that should be right

It is because I shall use the "Micro Flex Drive" when I get them (and they only use 1 x cr123) And then I had forgotten the rkcstr driver shall use 2 x cr123 batteries.

I say thank you very much, it is nice with some helpful people on this forum
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Old 02-25-2009, 10:29 AM #6
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Default Re: How do I connect, battery/driver/test load?

7.2 should be good
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