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Old 09-16-2011, 04:19 AM #1
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Default HeNe hookup - am I doing something wrong?

OK, I've connected a dozen HeNe tubes and never had a problem until now.

I just bought a 3227H-C-59 Melles Griot head with a 380T power supply.

I connected it as per what I thought was correct from the info below.

The power supply has a green/yellow, a brown and a white lead. I'm getting nothing.

All the other AC supplies are yellow/white/white and I've done a bunch of them. I'm worried that the PS or head are bad. I just bought from ebay.

Any reasons why this wouldn't work? Any help?



Helium Neon Laser Power Supplies - Laser Drive

http://www.laserdrive.com/pdf/henehook.pdf


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Old 09-16-2011, 04:42 AM #2
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Default Re: HeNe hookup - am I doing something wrong?

Quote:
Originally Posted by icecruncher View Post
OK, I've connected a dozen HeNe tubes and never had a problem until now.

I just bought a 3227H-C-59 Melles Griot head with a 380T power supply.

I connected it as per what I thought was correct from the info below.

The power supply has a green/yellow, a brown and a white lead. I'm getting nothing.

All the other AC supplies are yellow/white/white and I've done a bunch of them. I'm worried that the PS or head are bad. I just bought from ebay.

Any reasons why this wouldn't work? Any help?



Helium Neon Laser Power Supplies - Laser Drive

http://www.laserdrive.com/pdf/henehook.pdf
It should be AC = brown to white with the green/yellow as ground

After you hook it up for a bit, when you pull the Alden, short the contact pins on the Alden. Does it spark? If so, the tube is getting power, but won't light.

If not it could still be either the PSU bad or the tube is bad

If the tube is bad, it could be the tube itself or a wire broke or one of the resistors is blown

Any testing of that stuff will require you to open the ends of the housing and deal with exposed high voltage

Can you connect the PSU to another tube to check it?

Peace,
dave

**EDIT** -- Oh yeah -- Welcome to the wonderful world of used gas lasers
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Last edited by daguin; 09-16-2011 at 04:50 AM.
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Old 09-16-2011, 11:52 AM #3
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Default Re: HeNe hookup - am I doing something wrong?

Quote:
Originally Posted by daguin View Post
It should be AC = brown to white with the green/yellow as ground

After you hook it up for a bit, when you pull the Alden, short the contact pins on the Alden. Does it spark? If so, the tube is getting power, but won't light.

If not it could still be either the PSU bad or the tube is bad

If the tube is bad, it could be the tube itself or a wire broke or one of the resistors is blown

Any testing of that stuff will require you to open the ends of the housing and deal with exposed high voltage

Can you connect the PSU to another tube to check it?

Peace,
dave

**EDIT** -- Oh yeah -- Welcome to the wonderful world of used gas lasers
Thanks for the help.

My other power supplies are not nearly rated as high as the 380T, which I why I got it.

I don't want to tear anything apart, this was supposed to work when I bought, so otherwise, I'll get a replacement or refund.

I'll try what you suggested.
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Old 09-16-2011, 04:21 PM #4
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Default Re: HeNe hookup - am I doing something wrong?

Quote:
Originally Posted by icecruncher View Post
Thanks for the help.

My other power supplies are not nearly rated as high as the 380T, which I why I got it.

I don't want to tear anything apart, this was supposed to work when I bought, so otherwise, I'll get a replacement or refund.

I'll try what you suggested.
If you are going to keep going in the gassy side of things, I would recommend picking up an HV probe as well. It is the easiest way to do a quick test of a PSU.

Also, if you haven't already, pick up (or build) an oudin coil. You can use it to "kick start" a reluctant gas laser. You can also use it to do a quick test to see if a tube is still "gas intact"

Peace,
dave
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Last edited by daguin; 09-16-2011 at 04:22 PM.
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Old 09-16-2011, 06:28 PM #5
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Default Re: HeNe hookup - am I doing something wrong?

Thanks for the suggestions.

I'm hooked on gas. So I'm sure I'll be picking up some new items to test with, those among others.


Editing on 9/17/11
I must have been having a bad night last night. Hooked up tonight and fired right off.

Got 9.3 mw peak on the tube, so I'm quite happy about that.
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Last edited by icecruncher; 09-18-2011 at 12:40 AM. Reason: added info - it's working!!!
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