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Old 10-01-2011, 08:38 PM #17
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Default Re: WTB: LPM with fast response (Ophir?) sensor.

I know what you meant. It is called a panel meeter.


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Old 10-01-2011, 08:45 PM #18
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Default Re: WTB: LPM with fast response (Ophir?) sensor.

Thanks DTR

I forgot to put an E, more in meeter, maybe someday I will learn to write English correctly haha,
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Old 10-01-2011, 08:46 PM #19
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Default Re: WTB: LPM with fast response (Ophir?) sensor.

Quote:
Originally Posted by rhd View Post
Can you link me? "NOS Ophir" didn't do me any good as a search term.
NOS=New Old Stock...
The heads were actually New Surplus unused heads.
DTR has the correct link for the new Calibrated ones..

Quote:
Originally Posted by Trevor View Post
The sensor should only be consuming a few milliamps.

-Trevor
What draws the majority of the current is the converter
if used and the LED DPM...
An LCD type would no doubt draw less current..

Quote:
Originally Posted by piferal View Post
My fault, with "panel meter" I meant the red LCD voltmeter.
You are still correct.. It is a Digital Panel Meter (DPM) that
just happens to be a voltage measuring type...


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Old 10-01-2011, 11:28 PM #20
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Default Re: WTB: LPM with fast response (Ophir?) sensor.

So if I understand correctly, I could pair this:
Ophir OEM Broadband Thermopile Laser Power Meter **NEW* | eBay
with this:
DC 0-33V 4 Digits LED Panel Meter Voltmeter 0.36'' Blue | eBay

With that particular panel, it looks like I could place a 9V supply between Red and Black, and then attach the LPM between Black and Green. Voila, complete LPM system?

Is it really that easy?
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Old 10-02-2011, 12:42 AM #21
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Default Re: WTB: LPM with fast response (Ophir?) sensor.

No... with that DPM you will get a resolution of 10mW...

And it takes a split supply to get the head to work
properly....

A little research on the Forum would have got you this....

DIY Pre-Calibrated LPM for under $100.00....



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Old 10-02-2011, 12:53 AM #22
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Default Re: WTB: LPM with fast response (Ophir?) sensor.

Quote:
Originally Posted by lasersbee View Post
No... with that DPM you will get a resolution of 10mW...
How were you able to identify that? It didn't seem to specific resolution, unless I overlooked something.

When I saw that each digit had a decimal point LED next to it, I assumed that the display would have shown 3 digits of precision when measuring < 10V.

If that's not the case, I'll need to keep searching for a a volt meter readout. LED would be preferable. Presumably a 4 digit display with a voltage measurement range in the single digits would be appropriate.
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Old 10-02-2011, 01:31 AM #23
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Default Re: WTB: LPM with fast response (Ophir?) sensor.

It's simple....
It is a full 4 Digit Display...
The specs for that DPM state a maximum display of 33Volts
It takes at least 2 of the 4 digits to display 33..... or 32

Then there are 2 digits left.... 32.XX is all you get...
Accuracy is stated at 1 digit....
That is a resolution of 10mV....


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Old 10-02-2011, 01:57 AM #24
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Default Re: WTB: LPM with fast response (Ophir?) sensor.

The panel meeter draws 90mA. So that leaves 40mA being drawn by the head and the converters. I prefer the LED as it is much better for making LPM videos for my tutorials or customers.

Here is the one I ordered. If you get something similar read the description carefully they have ones that look identical but some don't have the same resolution or range.
This is a 20V range with 1mV resolution.
4 1/2 Digital DC20V Voltage Panel Meter Voltmeter | eBay



Here is a diagram 300EVIL over @ PL made for me. You can use 2 9V batteries instead of four like the picture or you can replace them with two 12V out DC-DC converters as I did.

Last edited by DTR; 10-02-2011 at 02:02 AM.
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Old 10-02-2011, 02:27 AM #25
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Default Re: WTB: LPM with fast response (Ophir?) sensor.

Quote:
Originally Posted by lasersbee View Post
It's simple....
It is a full 4 Digit Display...
The specs for that DPM state a maximum display of 33Volts
It takes at least 2 of the 4 digits to display 33..... or 32

Then there are 2 digits left.... 32.XX is all you get...
Accuracy is stated at 1 digit....
That is a resolution of 10mV....
Thanks Jerry

I (perhaps incorrectly) assumed that the presence of 4 decimal points indicated that in the 0-9 V range, the display would scale to show 1mW resolution. IE, 1.532 volts, could show as such (the display itself appears capable of that) But I suppose that with cheap chinese stuff, it's unwise to make such assumptions.

Quote:
Originally Posted by DTR View Post
The panel meeter draws 90mA. So that leaves 40mA being drawn by the head and the converters. I prefer the LED as it is much better for making LPM videos for my tutorials or customers.

Here is the one I ordered. If you get something similar read the description carefully they have ones that look identical but some don't have the same resolution or range.
This is a 20V range with 1mV resolution.
4 1/2 Digital DC20V Voltage Panel Meter Voltmeter | eBay

Here is a diagram 300EVIL over @ PL made for me. You can use 2 9V batteries instead of four like the picture or you can replace them with two 12V out DC-DC converters as I did.
Thanks DTR, that's really helpful.

Am I misinterpreting the schematic, or does that have 36V (4x 9V batteries in series) connected to the LPM head?
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Last edited by rhd; 10-02-2011 at 02:28 AM.
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Old 10-02-2011, 02:35 AM #26
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Default Re: WTB: LPM with fast response (Ophir?) sensor.

Quote:
Originally Posted by DTR View Post
Hi, I manage to locate this OPHIR head for slightly less, may I know if this is the same as the one above and can be used?

Ophir OEM Laser Power Meter Sensor for CO2 YAG 60W | eBay
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Old 10-02-2011, 02:46 AM #27
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Default Re: WTB: LPM with fast response (Ophir?) sensor.

Quote:
Originally Posted by rhd View Post
Thanks Jerry

I (perhaps incorrectly) assumed that the presence of 4 decimal points indicated that in the 0-9 V range, the display would scale to show 1mW resolution. IE, 1.532 volts, could show as such (the display itself appears capable of that) But I suppose that with cheap chinese stuff, it's unwise to make such assumptions.



Thanks DTR, that's really helpful.

Am I misinterpreting the schematic, or does that have 36V (4x 9V batteries in series) connected to the LPM head?
2 Batts in parallel and 2 in series (read it wrong)
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Old 10-02-2011, 02:48 AM #28
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Default Re: WTB: LPM with fast response (Ophir?) sensor.

Quote:
Originally Posted by rhd View Post



Thanks DTR, that's really helpful.

Am I misinterpreting the schematic, or does that have 36V (4x 9V batteries in series) connected to the LPM head?
As I understand it. +18V and -18V.

Quote:
Originally Posted by Jaxz View Post
Hi, I manage to locate this OPHIR head for slightly less, may I know if this is the same as the one above and can be used?

Ophir OEM Laser Power Meter Sensor for CO2 YAG 60W | eBay
It is not the same. That one is a 60W head Calabrated for CO2 or YAG lasers. The one I linked to is a 5W head that is designed for visible wavelengths.

They both may read visible wavelenght lasers but the 60W heads resolution is "Calibration: 0.1 Volts / Watt" 10mW resolution

And the 5W head is "The meter is calibrated 1 mV" 1mW resolution

Last edited by DTR; 10-02-2011 at 02:58 AM.
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Old 10-02-2011, 03:09 AM #29
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Default Re: WTB: LPM with fast response (Ophir?) sensor.

oiC, thanks very much DTR..
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Old 10-02-2011, 03:29 AM #30
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Default Re: WTB: LPM with fast response (Ophir?) sensor.

Quote:
Originally Posted by DTR View Post
As I understand it. +18V and -18V.
The eBay listing actually calls for:
"All you have to do is supply the power meter with +/- 15 volts, and a voltage is outputted in proportion to the laser power."
But 300Evil knows his shit, so I'm assuming the 18V figure is safe?

What did you use as a DC-DC converter?
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Old 10-02-2011, 03:35 AM #31
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Default Re: WTB: LPM with fast response (Ophir?) sensor.

Quote:
Originally Posted by rhd View Post
The eBay listing actually calls for:
"All you have to do is supply the power meter with +/- 15 volts, and a voltage is outputted in proportion to the laser power."
But 300Evil knows his shit, so I'm assuming the 18V figure is safe?

What did you use as a DC-DC converter?
Well at first I had it hooked up to two nine volt batteries for +9V and -9V and it worked just fine. The data sheet says "5V to 18V regulated".
http://www.ophiropt.com/laser/pdf/20...-A_20C-UAU.pdf

Last edited by DTR; 10-02-2011 at 03:35 AM.
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Old 10-02-2011, 04:31 AM #32
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Default Re: WTB: LPM with fast response (Ophir?) sensor.

I'm going to take the plunge and grab one.

I've been searching for the last 20 or 25 minutes to find a similar LED panel in blue instead of red. I couldn't find one with the appropriate resolution. If anyone happens to have found one, know of a link, let me know. I'm going to place my order in ~30 minutes. Going to search for a nice housing first
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SAFETY & IMPORTANT READING (threads authored and contributed to by various members of LPF):
- Federal Aviation Administration - Laser Safety Initiative (link)
- Info release from Laserglow - Default Canadian restrictions on portable lasers (link)
- The Necessity of Safety Goggles (link)

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