Old 02-05-2018, 05:52 PM #1
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Default Some help with fixing my power meter

So ages ago the sensor connection port on my Radiant X4 LPM broke, and today I finally got a replacement connector in the mail and got it all fixed up. Sadly though, when I went to retrieve the sensor, I discovered this:



The sensor is completely ruined. Not sure how this happened, might have dropped it at one point and never noticed, but I'm wondering now if this is repairable. I tried seeing if I could simply order a replacement sensor, but the link on Radiant's website to their online store just goes to a 404 page.

Looks like is just simply a thermoelectric device, so it could potentially be replaced. I'm hoping someone on here might know what the part number is, or suggest replacements. Its 1.5cm square in size if that helps.

Theres a trim pot on the Radiant X4, I'm willing to bet thats used for calibrating the sensor, so even if its not an identical TEM I should be able to adjust for differences.

Thanks!


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Old 02-05-2018, 05:59 PM #2
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Default Re: Some help with fixing my power meter

Man.. BK... It's not your week...

It looks an over temperature or mechanical
force failure.

The trimpot is for the LCD contrast if indeed it's
a Radiant X4 LPM you have.

IIRC...the calibration is done in software...
You will need to get a hold of the original
sellers/manufacturers to get a replacement
and instructions on calibration.
Good luck...

Jerry
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Old 02-05-2018, 06:06 PM #3
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Default Re: Some help with fixing my power meter

Well shite. The original sellers are MIA....

Hmm, perhaps if I can un-glue the TEM from the heatsink it will have a part number on it.

Anyone know a good way to remove thermal glue?
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Old 02-05-2018, 06:11 PM #4
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Default Re: Some help with fixing my power meter

I's always better to buy a product from a
seller that you know will be around when
you need them even if the initial cost is a
bit higher. A bargain is not always a bargain...

Maybe someone on the Forum has some
contact info. IIRC.. The seller was also on
a Flashlight Forum.

He was also on PL with the same UserName
as here.

Jerry
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Old 02-05-2018, 06:26 PM #5
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Default Re: Some help with fixing my power meter

I found him on here, his last post was in 2015.... Not sure I'll be able to get help then.
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Old 02-05-2018, 06:29 PM #6
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Default Re: Some help with fixing my power meter

Good luck...
FYI... I have a brand new X4 on the shelf
in the shop with the 3D printed case.

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Old 02-05-2018, 06:36 PM #7
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Default Re: Some help with fixing my power meter

eh. Its got an Atmel chip and a nice LCD module. Maybe Ill modify it into something else so the X4 body doesn't go to waste.
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Old 02-05-2018, 10:20 PM #8
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Default Re: Some help with fixing my power meter

Quote:
Originally Posted by Blarg King View Post
eh. Its got an Atmel chip and a nice LCD module. Maybe Ill modify it into something else so the X4 body doesn't go to waste.
That's not a bad idea...
We often use the LaserBee I and LaserBee II
PCBs in the shop to make prototype MCU
controllers for other than LPM projects.

I have one running our Solder Re-Flow oven.

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Old 02-05-2018, 10:58 PM #9
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Default Re: Some help with fixing my power meter

Could try setting it on fire... That might work!
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Old 02-05-2018, 11:14 PM #10
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Default Re: Some help with fixing my power meter

OMG, now I need to buy an LPM too?
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Old 02-06-2018, 12:11 AM #11
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Default Re: Some help with fixing my power meter

Quote:
Originally Posted by diachi View Post
Could try setting it on fire... That might work!
Diachi, you are killing me! That got an audible laugh out of me.

Yeah, there's no way you are going to be able to repair that and get it calibrated too. Mine still works great, but I keep it boxed up when not in use, though I've used it hundreds of times.
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Old 02-06-2018, 12:52 AM #12
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Default Re: Some help with fixing my power meter

It takes a pretty serious impact to cleave a TEC in half like that - a drop sounds likely.

You can replace the TEC with pretty much any similarly sized ones and paint it black. The calibration will likely not be the same, not sure if those have a user accessible calibration menu or not. High temperature paints will offer better damage thresholds.

As for removing the old one, heating it with a torch can soften thermal epoxy and allow you to pop off the remainder with a chisel/screwdriver/etc.
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Old 02-06-2018, 12:58 AM #13
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Default Re: Some help with fixing my power meter

Hmm. If I can remove it somewhat intact I might be able to get a model number for the TEC then I could replace it with an identical model..
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Old 02-06-2018, 04:11 AM #14
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Default Re: Some help with fixing my power meter

Quote:
Originally Posted by Blarg King View Post
Hmm. If I can remove it somewhat intact I might be able to get a model number for the TEC then I could replace it with an identical model..

Problem then is finding a coating that's both broadband and has a high damage threshold, then you need to re-calibrate it, which you can't do without another calibrated LPM.

Better to buy something else I'd say, though it doesn't hurt to try!

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Diachi, you are killing me! That got an audible laugh out of me.
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Old 02-06-2018, 04:17 AM #15
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Default Re: Some help with fixing my power meter

Both excellent points. Even if you somehow manage to find a broadband coating for the TEC, you still have to calibrate it. Can't be done without lasers of known powers.
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Old 02-06-2018, 04:22 AM #16
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Default Re: Some help with fixing my power meter

If that was my power meter, I'd forget it myself, abandon all hope!
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Attention new brothers of the collimated light!

Newbie advice: Please take the time to first make an introduction in the Welcome section before posting questions: - https://laserpointerforums.com/f37


Divergence to spot size calc: - 1 mRad is about .057 degrees which expands to be ~very~ roughly ~10% the diameter of the moon or sun at their distances.

Divergence Calculator: pseudonomen137's JScript mRad Calculator - Measure your lasers beam dia. at 1 foot & then 20'.

Online calc. to determine spot intensity at different mRad's & powers: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: Laser Power Density Calculator - Ophir

Build a beam expander to reduce divergence: http://tinyurl.com/BeamExpander

University YAG Project The Professor's Homebuilt Lasers Site - YAG Lasers

YAG Power Calc. Laser Peak Power Calculator - Ophir

Angular Size Calculator; use with diode angle of radiation spec. for lens dia. at FL: Angular Size Calculator

RHD's Relative Brightness vs Wavelength Calc: https://tinyurl.com/RHD-brightness

High Current Pulse Diode Drivers: https://tinyurl.com/ya7whuk3
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