please help

pedropinedacas
Posts: 2
Joined: Tue Apr 05, 2016 5:14 pm

please help

Postby pedropinedacas » Mon Sep 17, 2018 6:46 pm

I have a problem with my laser
AWC708C 80W tube
It does not cut, it does not record, it's very weak. the ammeter jumps sharply.
Does anyone know what may be happening?
Thanks for the help
https://youtu.be/yHaI7CtB7n4

Techgraphix
Posts: 484
Joined: Fri Jan 20, 2012 1:39 pm
Location: Appelscha, the Netherlands
Contact:

Re: please help

Postby Techgraphix » Tue Sep 18, 2018 6:33 am

Normally i would expect the tube to be broken: The current you measure is way too high.
When tubes degrade you will notice a rise in current and a decrease in outputpower.
But you still will see the plasma inside (as in your video)
The HV-powersupply can't deliver that current all the time. That's why you see it collapse
Yours is an extreme example of this..
Is the tube new?
Did it work well before?
Did you connect it the right way?
No airbubbles in the coolingliquid (that might have destroyed the tube)?
Do you use a decent cooling (like CW5200 or similar)
No arcing near the HV-connections?

Normally the return-wire, that is connected to the mA-meter, is attached to the side of the tube, where the beam comes out.
Did you do so?
Kees

pedropinedacas
Posts: 2
Joined: Tue Apr 05, 2016 5:14 pm

Re: please help

Postby pedropinedacas » Tue Sep 18, 2018 6:53 am

thanks for your help
the laser worked well. The tube has only 50 hours of use
the machine was not working for 18 months it is possible that the tube had
damaged?
Appreciate your help

Techgraphix
Posts: 484
Joined: Fri Jan 20, 2012 1:39 pm
Location: Appelscha, the Netherlands
Contact:

Re: please help

Postby Techgraphix » Tue Sep 18, 2018 1:04 pm

Tubes do get worse in time, even when stored.. but 18 months is a bit short to get this.. Normally i won't use a tube that is older than two years of storage.
It's a guess, but i think when you replace the tube for a fresh new one, your laser will work fine again..
That is, ofcourse, when you have not damaged the HV-supply..
Some (radio-)tube collectors are very happy with a real BIG lasertube ;)

Kees


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