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Old 01-30-2012, 03:05 AM #1
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Default Coherent Kenometer mod to get 10W reading??

So, I bought my Kenometer with Coherent thermopile back in August (I was at SELEM at the time. )
This was supposedly the last one the Kenom ever sold.

Anyway, when he sold it to me, he said that the digital readout will meter up to 2W.
He then said that I can read up to 10W by attaching a DMM to the test ports on the back of the meter.
This is where I am having issues.

This is a pic that I found of another member's Coherent Kenometer.
See the test ports on the back and the switch on the side (to change the output from digital readout to DMM ports)?


This is a pic of my Kenometer....


Yup....methinks something is missing.

My question is; does anyone know how to go about wiring in the ports and switch to use a DMM and meter up to 10w?
It is annoying that I can only meter to 2W when I know what that awesome sensor is capable of.

I have pm'ed Kenom, but everyone knows that is a lost cause as of late...
It is supposed to have a year warranty, but he never responds.

Can anyone help me out?


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My laser list has become way too big; I'm listing some of my favorites out of my extensive collection.
615mw 405nm/12X Spiderfire X-03
148mw 405nm/GGW in my "Hotlight-Saber" host
1920mw 445nm River Rock custom
1530mw 445nm Yobresal
1360mw 445nm Qumefox Sipik
800mw 445nm WL Arctic Spyder S3
240mw 473nm CNI Labby
8mw 473nm CNI Labby
528mw 532nm Lazerer Cannon
310mw 532nm Firedragon III
300mw 532nm CNI Labby
180mw 532nm SKY Laser
4x 147-267mw 532nm Waterproof
900mw 635nm in Temporary Finned Labby Sink
Several 635nm diodes awaiting a build
500mw 650nm Dual LPC-826 Labby
251mw 650nm/LPC-815 Ultrafire U-501B
Several 685nm diodes awaiting a build
3W 808nm diode awaiting build

Kenometer w/ Coherent Thermopile 10W
LaserBee 2.5W USB LPM
Radiant Alpha 2W LPMSOLD=Now in Kuwait!
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Last edited by rocket689; 01-30-2012 at 03:06 AM.
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Old 01-30-2012, 02:33 PM #2
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Default Re: Coherent Kenometer mod to get 10W reading??

How much did you pay for that LPM...
Maybe this will help.....

DIY-10Watt-Laser Power Meter Project...



Jerry
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Old 01-30-2012, 08:03 PM #3
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Default Re: Coherent Kenometer mod to get 10W reading??

I'm not familiar with the insides of a kenometer, but maybe it's possible to just bring the leads from the panel meter to connectors on the outside. Reasonably easy to do, depends on the circuit if it would actually work.
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Old 01-30-2012, 08:29 PM #4
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Default Re: Coherent Kenometer mod to get 10W reading??

^It'll work. You're just changing one voltmeter for another. Unless your volt meter has a low input impedance (and it doesn't) then there will be no problem.
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Old 01-30-2012, 09:33 PM #5
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Default Re: Coherent Kenometer mod to get 10W reading??

Quote:
Originally Posted by Bluefan View Post
I'm not familiar with the insides of a kenometer, but maybe it's possible to just bring the leads from the panel meter to connectors on the outside. Reasonably easy to do, depends on the circuit if it would actually work.
The link I posted above shows the inside of the Kenometer...

It seems clear to me that the bannana plugs on the OP's kenometer
no doubt connect to the 2nd toggle switch which chooses the internal
meter or the external LPM...


Jerry
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Old 01-30-2012, 10:20 PM #6
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Default Re: Coherent Kenometer mod to get 10W reading??

Quote:
Originally Posted by lasersbee View Post
The link I posted above shows the inside of the Kenometer...
And I haven't had the time yet to familiarize myself with the insides.
But I'll read it sometime, thnx for the link
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Old 01-31-2012, 02:07 PM #7
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Post Re: Coherent Kenometer mod to get 10W reading??

A big to all that have replied.

I never found that thread through the search function, Jerry.
The search of the forum sucks since the search window disappeared.

Taking the input leads off of the display and running them to a selector switch sounds easier.

But Jerry's mod looks to be the right way to do things.
The "you may end up with a nonfunctioning kenometer" kind of worries me, though.

What would the DMM be set to if using it to read mw?

Thanks again for the input, guys.
__________________
Would you like to purchase some M-140 445nm diodes (individual or pressed into Aixiz or pure copper module) at very reasonable prices? PM me if you are interested!

My laser list has become way too big; I'm listing some of my favorites out of my extensive collection.
615mw 405nm/12X Spiderfire X-03
148mw 405nm/GGW in my "Hotlight-Saber" host
1920mw 445nm River Rock custom
1530mw 445nm Yobresal
1360mw 445nm Qumefox Sipik
800mw 445nm WL Arctic Spyder S3
240mw 473nm CNI Labby
8mw 473nm CNI Labby
528mw 532nm Lazerer Cannon
310mw 532nm Firedragon III
300mw 532nm CNI Labby
180mw 532nm SKY Laser
4x 147-267mw 532nm Waterproof
900mw 635nm in Temporary Finned Labby Sink
Several 635nm diodes awaiting a build
500mw 650nm Dual LPC-826 Labby
251mw 650nm/LPC-815 Ultrafire U-501B
Several 685nm diodes awaiting a build
3W 808nm diode awaiting build

Kenometer w/ Coherent Thermopile 10W
LaserBee 2.5W USB LPM
Radiant Alpha 2W LPMSOLD=Now in Kuwait!
1.2W RGB Projector; JNM Wide Sky Galvos (Made in Germany); Laser Show Express; Arduino-based DAC
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Old 01-31-2012, 02:30 PM #8
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Default Re: Coherent Kenometer mod to get 10W reading??

Quote:
Originally Posted by rocket689 View Post
A big to all that have replied.

I never found that thread through the search function, Jerry.
The search of the forum sucks since the search window disappeared.

Taking the input leads off of the display and running them to a selector switch sounds easier.

But Jerry's mod looks to be the right way to do things.
The "you may end up with a nonfunctioning kenometer" kind of worries me, though.

What would the DMM be set to if using it to read mw?

Thanks again for the input, guys.
The Search Bar is still there... It had been moved to the bottom
of every Forum Page because it took so long to load and it made
the pages jump when it finally did load. Look under the Reply Box.

Take pictures and make drawings of all the connections BEFORE
you do any mods so that you can bring it back to its original state.

Using a DMM the output is still 1mV/1mW.... So if you are measuring
4 watts set the DMM to 20V or as low as you can get a full 4000mV
reading.
At the 20 Volt scale you will only have a resolution of 10mV. That is
to say that the DMM display will only change with 10mV of input.

The DPM we chose for the project will read up to 20Volts in 1mV
increments without needing to change the reading scale and such
has a resolution of 1mV.


Jerry
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Old 01-31-2012, 02:38 PM #9
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Default Re: Coherent Kenometer mod to get 10W reading??

Jerry,
Where did you buy that DPM from ?

Jim
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Old 01-31-2012, 03:08 PM #10
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Default Re: Coherent Kenometer mod to get 10W reading??

If you are referring to the 10W LPM Project... we got those
on eBay at the time of that project as is show in the parts
list on that Thread...


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Old 02-01-2012, 01:22 PM #11
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Default Re: Coherent Kenometer mod to get 10W reading??

Quote:
Originally Posted by lasersbee View Post
The Search Bar is still there... It had been moved to the bottom
of every Forum Page because it took so long to load and it made
the pages jump when it finally did load. Look under the Reply Box.

Take pictures and make drawings of all the connections BEFORE
you do any mods so that you can bring it back to its original state.

Using a DMM the output is still 1mV/1mW.... So if you are measuring
4 watts set the DMM to 20V or as low as you can get a full 4000mV
reading.
At the 20 Volt scale you will only have a resolution of 10mV. That is
to say that the DMM display will only change with 10mV of input.

The DPM we chose for the project will read up to 20Volts in 1mV
increments without needing to change the reading scale and such
has a resolution of 1mV.


Jerry
Thanks, Jerry.

I had thought that had read somewhere that the Coherent setup wasn't the standard 1mV=1mw like the Ophir.
That helps alot.

__________________
Would you like to purchase some M-140 445nm diodes (individual or pressed into Aixiz or pure copper module) at very reasonable prices? PM me if you are interested!

My laser list has become way too big; I'm listing some of my favorites out of my extensive collection.
615mw 405nm/12X Spiderfire X-03
148mw 405nm/GGW in my "Hotlight-Saber" host
1920mw 445nm River Rock custom
1530mw 445nm Yobresal
1360mw 445nm Qumefox Sipik
800mw 445nm WL Arctic Spyder S3
240mw 473nm CNI Labby
8mw 473nm CNI Labby
528mw 532nm Lazerer Cannon
310mw 532nm Firedragon III
300mw 532nm CNI Labby
180mw 532nm SKY Laser
4x 147-267mw 532nm Waterproof
900mw 635nm in Temporary Finned Labby Sink
Several 635nm diodes awaiting a build
500mw 650nm Dual LPC-826 Labby
251mw 650nm/LPC-815 Ultrafire U-501B
Several 685nm diodes awaiting a build
3W 808nm diode awaiting build

Kenometer w/ Coherent Thermopile 10W
LaserBee 2.5W USB LPM
Radiant Alpha 2W LPMSOLD=Now in Kuwait!
1.2W RGB Projector; JNM Wide Sky Galvos (Made in Germany); Laser Show Express; Arduino-based DAC
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Old 02-01-2012, 01:29 PM #12
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Default Re: Coherent Kenometer mod to get 10W reading??

Quote:
Originally Posted by rocket689 View Post
Thanks, Jerry.

I had thought that had read somewhere that the Coherent setup wasn't the standard 1mV=1mw like the Ophir.
That helps alot.

The Coherent Head alone does not output 1mV/1mW....
It is the Coherent PCB in the Kenometer that amplifies
the Head's signal to the 1mV/1mW level...


Jerry
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Old 02-01-2012, 02:18 PM #13
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Default Re: Coherent Kenometer mod to get 10W reading??

Quote:
Originally Posted by lasersbee View Post
The Coherent Head alone does not output 1mV/1mW....
It is the Coherent PCB in the Kenometer that amplifies
the Head's signal to the 1mV/1mW level...


Jerry
Great! That means that I could use your data logging module to graph my output in Eagle Eye.
Ill have to add that to the future modificatons list.

UPDATE: Kenom has offered to make things right and repair it.
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Kenometer w/ Coherent Thermopile 10W
LaserBee 2.5W USB LPM
Radiant Alpha 2W LPMSOLD=Now in Kuwait!
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Last edited by rocket689; 03-23-2012 at 03:44 AM. Reason: update
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Old 02-01-2012, 02:38 PM #14
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Default Re: Coherent Kenometer mod to get 10W reading??

Quote:
Originally Posted by rocket689 View Post
Great! That means that I could use your data logging module to graph my output in Eagle Eye.
Ill have to add that to the future modificatons list.
Yes you can....

Jerry
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