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Old 02-18-2013, 12:22 AM #1
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Question Newbie looking for a cheap DIY LPM tutorial

Does anyone know of a DIY LPM tutorial that a beginner could use without ending up with a big price tag?


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Old 02-18-2013, 12:27 AM #2
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Default Re: Newbie looking for a cheap DIY LPM tutorial

What's your budget?

My ARGMeter's are coming out open source for DIY very soon, but they will cost you >100$ to DIY a TEC version.


You can DIY this for >50$
DIY Thermal LPM for under $50
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Old 02-18-2013, 12:29 AM #3
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Default Re: Newbie looking for a cheap DIY LPM tutorial

As cheap as i can get to get me within +/-.1 watt accuracy.
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Old 02-18-2013, 12:34 AM #4
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Default Re: Newbie looking for a cheap DIY LPM tutorial

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Originally Posted by laserlight84 View Post
As cheap as i can get to get me within +/-.1 watt accuracy.
You mean mW? and no...
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Old 02-18-2013, 12:37 AM #5
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Default Re: Newbie looking for a cheap DIY LPM tutorial

well i actually meant watts, but if there is performance plateau where you can get much more accuracy than that for the same price then i would definitely want the greatest accuracy for the same price. Lol

i just need something to ball park it for the moment.

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Old 02-18-2013, 12:40 AM #6
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Default Re: Newbie looking for a cheap DIY LPM tutorial

The accuracy depends on the calibration, which can't be done on your own without an LPM (you can use a laser that you had metered by someone else)

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Old 02-18-2013, 12:42 AM #7
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Default Re: Newbie looking for a cheap DIY LPM tutorial

i apologize, but i am rather new....what is involved in calibration? other than just using a standard to adjust the reading.
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Old 02-18-2013, 12:50 AM #8
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Default Re: Newbie looking for a cheap DIY LPM tutorial

Quote:
Originally Posted by laserlight84 View Post
i apologize, but i am rather new....what is involved in calibration? other than just using a standard to adjust the reading.
You take a stable laser lab laser, point it at a calibrated LPM, take note of the reading then point it at the uncalibrated LPM and set the the correct gain on the Opamp.

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Old 02-18-2013, 12:54 AM #9
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Default Re: Newbie looking for a cheap DIY LPM tutorial

ok, well that sounds simple enough. i can do that....i think. Thanks.

Now, i just need to find a super cheap kit/tutorial. i am working on shoe string budget.
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Old 02-18-2013, 12:57 AM #10
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Default Re: Newbie looking for a cheap DIY LPM tutorial

Quote:
Originally Posted by laserlight84 View Post
ok, well that sounds simple enough. i can do that....i think. Thanks.

Now, i just need to find a super cheap kit/tutorial. i am working on shoe string budget.
Can you put a number to your budget?

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Old 02-18-2013, 12:58 AM #11
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Default Re: Newbie looking for a cheap DIY LPM tutorial

$50.00
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Old 02-18-2013, 01:04 AM #12
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Default Re: Newbie looking for a cheap DIY LPM tutorial

Try this then?
DIY Thermal LPM for under $50

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Old 02-18-2013, 01:11 AM #13
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Default Re: Newbie looking for a cheap DIY LPM tutorial

i was hoping to find a more detailed tutorial possibly with a parts list AND where to pick them up, but if that is all there is then i guess i will just have to figure it out. :/ when will your $100.00 LPMs be available?
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Old 02-18-2013, 01:33 AM #14
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Default Re: Newbie looking for a cheap DIY LPM tutorial

They are 100$ to DIY, they will be sold at 150$. Available in a week or two.

You can pick up all of that on digikey.
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Old 02-18-2013, 01:37 AM #15
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Default Re: Newbie looking for a cheap DIY LPM tutorial

Ok, well thank you for the tips and tolerating my noobness

will there be instructions for your DIY? what tooling will it require? any software compilers our anything like that?
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Old 02-18-2013, 01:47 AM #16
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Default Re: Newbie looking for a cheap DIY LPM tutorial

Working on instructions. Requires a soldering iron and a computer with internet connection.
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