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Old 07-13-2010, 03:13 PM #129
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Default Re: DIY Thermal LPM for under $50

The HLPM II LPM Modules we sell are all calibrated in the
shop before shipping and output 1mV/1mW...
They attach to the DMM of your choice... we don't supply
the DMM we used for calibration..
The DMMs under $20.00 put side by side at 1000mV will
have have difference of ~+/- 1% (10mV)..

I just tested an expensive DMM against 2 cheap ones at
~1600 and got a difference from highest to lowest reading
of 6mV... that is only 0.6% total error or +/- 0.3% between
my 3 meters tested...

That would translate in an error of +/- 3 mW at 1000 mW..
(997mW to 1003mW).

Like I said... the problem of DMM accuracy is far from an
issue even with the cheap <$10 DMMs...


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Old 07-13-2010, 04:03 PM #130
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Default Re: DIY Thermal LPM for under $50

Jerry I agree with you 100%.

All I'm saying is that the error, however small, (from any inaccuracy between the meters) is irrelevant if the same meter is used to calibrate it in the first place.

I may send mine to Mario to calibrate for me (I don't have any >100mW lasers that I'm sure of the Po), and if I do I'll send my VOM with it. He'll calibrate it to my meter and any possible that error of up to +-3mW will be avoided altogether.

All said and done I think that an accuracy of +-5mW from this set up would be very good. For simple hobbyist purposes, that is good enough. I used to own a LaserBee but unfortunately I had to sell it. Ever since I've missed not having a meter.

-Tony
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Old 07-13-2010, 06:56 PM #131
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Default Re: DIY Thermal LPM for under $50

Quote:
Originally Posted by Xplorer877 View Post
Oh I see, yeah the specs were kinda misleading.



You're right there are many factors that will affect the accuracy of the meter but that is why the calibration is needed in the first place. There is no such thing as a material that will absorb 100% of the light. Otherwise you wouldn't even a reflected dot. But once calibrated the tolerances won't matter anymore. The accuracy of the meter doesn't matter as long as the same meter is always used. It'll be accurate relative to the Po because the system was calibrated to that particular meter.

-Tony
Correct, because it is calibrated it is the componet repeatability that matters.
Get a laser of known power measured with a calibrated meter. Test/calibrate on the DIY meter with that laser.

FYI, Spectralon SRS-02 reflects only 2% of light from UV to near-IR. I've got some and it is BLACK.
It almost hurts your eyes to look at and focus on.
They also make SRS-99 which diffusely reflects 99% of UV --> near IR light.
It's so white it looks like it glows.
We use them (with other shades too) as Spectral Reflectance Standards for FTIR, Spectrophotometry, and Far-IR emissivity testing.

I'm not sure the SRS comes in paint form though... I'll have to call the company.
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Old 07-13-2010, 10:46 PM #132
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Default Re: DIY Thermal LPM for under $50

Where can you get some Spectralon SRS-02? As long as it doesn't burn it can be sprinkled over the wet paint on the TEC.

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Old 07-14-2010, 02:44 PM #133
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Default Re: DIY Thermal LPM for under $50

This might be slightly OT... but not really.

Is there a way to make a cheap digital LCD readout that is driven by a mV detecting circuit? That way, we don't have to have to use a Multimeter. Not that a multimeter is a problem but I think it's be pretty slick if we could make the whole standalone unit... thermopile, amplifier, meter, and digital readout.

I've seen people make small standalone digital temperature readouts that plug directly into thermocouples... would a TEC be any different?
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Old 07-14-2010, 03:46 PM #134
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Default Re: DIY Thermal LPM for under $50

I thought about that too. The obvious solution would be to buy a cheap VOM and pull out the LCD and circuit. You can put everything in a nice project box and wire it up with a double pole switch. One pole will activate the amp circuit and the other can set the VOM to the mV range. I might do that. I have a small pocket sized Radio Shack meter that I don't use anymore since I got my Fluke meter.

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Old 07-14-2010, 04:03 PM #135
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Default Re: DIY Thermal LPM for under $50

Quote:
Originally Posted by LazyBeam View Post
Is there a way to make a cheap digital LCD readout that is driven by a mV detecting circuit? That way, we don't have to have to use a Multimeter.
Do you mean like these ones ?

NEW 3?Digital Blue LCD DC 0~19.99V Volt Panel Meter - eBay (item 260633971389 end time Jul-14-10 13:28:11 PDT)

This is a 20V unit, but the scale can be changed, substituting the set resistor on the back ..... basically, all these modules have a 200mV minimum scale .....
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Old 07-14-2010, 04:30 PM #136
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Default Re: DIY Thermal LPM for under $50

Quote:
Originally Posted by HIMNL9 View Post
Do you mean like these ones ?

NEW 3?Digital Blue LCD DC 0~19.99V Volt Panel Meter - eBay (item 260633971389 end time Jul-14-10 13:28:11 PDT)

This is a 20V unit, but the scale can be changed, substituting the set resistor on the back ..... basically, all these modules have a 200mV minimum scale .....
Yes, those would be the best choice. I know that this is what Kenom used in his old kenometers and is also what nospin uses (not the same model, but same idea).
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Old 07-14-2010, 05:52 PM #137
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Default Re: DIY Thermal LPM for under $50

"Volt Panel Meter" ... yes that is it! Looks like digikey carries quite a few of them.
Thank you HIMNL! +1

OK guys, I ran around digikey a little bit and here's a pair f cheap 2V (2000mV) Volt Panel Meters.
Keep in mind, these run up to ~2000mV with good accuracy.
Instead of buying a DMM to use on an LPM you could use one of these... possibly even set drivers with it too.
A 9V battery can power these and I would reccomend a separate 3V circuit for the LPM. (1 9V & 2 AA/AAA)

CDPM312-ND ... Green Backlit Display, 2volt, 9v input ... ($31.19)
(Backlight requires a +5v input acheivable with a >500mW 5.1v zener diode and 1/2w 40ohm resistor)

811-1019-ND ... No Backlight, 2volt, 9v input ... ($30.14)

Here's one on Ebay ... Blue Blacklight Display, 2volt, 9V input ... ($8.99)
(It's not as accurate as the two above but 0.5% is OK for what we're doing)
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Old 07-14-2010, 09:22 PM #138
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Default Re: DIY Thermal LPM for under $50

What you need is a 2volt self contained Volt Meter that
has a resolution of 1mV...
You can pick them up the cheapest on eBay... Why pay ~$30
plus shipping when you can get one for~$10.00 with shipping
included...

3 1/2 Red LED Digital Volt Panel Meter DC 2V on eBay.ca (item 390212706422 end time 23-Jul-10 07:06:11 EDT)

And yes the older Kenomerters and the nospin meter and my
own modified meters use similar meters..

BTW... the blue one posted above is a good choice as well and
even cheaper....
0.5% is more than enough accuracy... the rest of the $50.00 LPM
will be much more inaccurate than that...IMO


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Old 07-15-2010, 05:20 PM #139
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Default Re: DIY Thermal LPM for under $50

OK Hey just a quick update i order everything today except for the Box.

I decided to go with this Tec:
Digi-Key - 102-1672-ND (Manufacturer - CP60133)

I also Got this:
NEW 3˝ Digital Blue LCD DC 0~1.999V Volt Panel Meter - eBay (item 280325833119 end time Jul-16-10 03:04:26 PDT)
Thanks Lazybeam

Oh and forgot to order some Alumina Thermal Adhesive and paint will do right now, So after these 2 i just need to get the box to put it in ."Still Haven't decided"

Also i am trying to open Post #78 on page 4 and i cant because i guess i cant open a brd. Can someone that can open save it in a different format and upload here so i can open it. Thank You.
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Old 07-15-2010, 07:18 PM #140
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Default Re: DIY Thermal LPM for under $50

Ask MarioMaster.... It is his PCB design..


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Old 07-16-2010, 12:25 AM #141
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Default Re: DIY Thermal LPM for under $50

if your making this on PCB just use PCB design i posted.
super easy
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Old 07-16-2010, 01:10 AM #142
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Default Re: DIY Thermal LPM for under $50

Quote:
Originally Posted by TTerbo View Post
if your making this on PCB just use PCB design i posted.
super easy
OK iam just going to do it on a breadboard for now..

This is my first time doing anything like this so iam learning as i go.

Can I use that same setup that you have on a Breadboard?
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Old 07-16-2010, 01:32 AM #143
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Default Re: DIY Thermal LPM for under $50

yeah you will just have to make sure you connect everything right.
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Old 07-16-2010, 01:35 AM #144
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Default Re: DIY Thermal LPM for under $50

OK if i get stuck i know i can come here for help

Thanks
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488nm 52mW OPSL SAPPHIRE 488-50, 59mW SS Melles Griot BCD-50&BCD-25 35mW
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589nm 130mW CNI-PGL-III-A
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658nm 430mW LOC 826 Brinyte A20 , LCC 390mW C3 3 mode
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685nm 44mW MXDL 2x AAA Pen, 41mW, 130mW Stainless Shadow
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