Melles Griot 05-LHP-991 operators manual

[tolland]

Hi All,

Our group received a donation of some kit including a Melles Griot 05-LHP-991 laser. For safety considerations I am currently seeking the operators guide for the model.

I've had a good google around, and I've emailed Melles Griot for support, but I've had no luck yet.

Does anyone have a pdf of the operators guide for a Melles Griot 05-LHP-991?

I would be ever so grateful

Thanks,
Tom

[mixedgas]

One, email is such a lousy way of communication. Receivers of inquiry email at large corporations feel almost no need to answer them.

LHP = Laser Head with Linearly Polarized output.

There is no intensity adjustment or modulation ability, or anything very demanding.

Call (use phone) MG and you'll get a PDF manual if they have one for that older model. If you have a very specific technical question ask for "Amir" at the "Gas Lasers" section in Carlsbad, but I would not bother Amir for a manual, hold him in reserve for that severe technical question.

There really is not much in the manual. Just do not ever operate the power supply without the tube attached. Keep it out of high humidity environments, and never take a direct hit from the beam to your eye.

If it does not light, you may need a interlock jumper, other then that, treat it like a fairly fragile glass tube (That is what is inside) and be careful how you clamp it. The stability of larger laser heads is very much determined by the force on the mounts.

MG's on line catalog pretty much covers what is in the manual, which is about 3-4 pages long and contains a few specifications and a lot of legalese language.

HENEs like to run, and they take about 20 minutes to fully stabilize.

see here:

http://www.repairfaq.org/sam/laserhcl.htm

Steve

[tolland]

There really is not much in the manual. Just do not ever operate the power supply without the tube attached. Keep it out of high humidity environments, and never take a direct hit from the beam to your eye.

The issue I have is that the unit blows the fuse when powered up.The laser appears to flash on for a fraction of a second as it blows. However there are no switches, or other user accessible controls on either the PSU or the laser, and both parts appear to be in pristine condition and were removed directly from their original housing and have never been dropped etc.

The power supply unit was supplied (the unit came out of a beckman coulter cytometer) with Brown/Blue/Green wires for input, and the information on the power supply indicates that it can take 110 or 240 VAC input;





The instructions on the back of the power supply indicate a T500mA fuse, and a voltage suppressor; but it was supplied in line with a 3A Fast blow fuse.

I had assumed that this was correctly protected, and I went ahead connected the wires to 240VAC power, however the laser turned on for a fraction of a second, and then the 3A fuse blew.

I tried another F3.12 fuse, and it did the same thing.



This is the current setup; I am wondering if the line voltage from the cytometer was actually 110VAC, and therefore that 3A fuse is to protect P/110 current.... but I would expect current to be higher for 110volts... though maybe there is some other effect I am missing?




Obviously I can change the 3A fast blow fuse for the 500mA slow blow fuse as per the instructions on the power supply, but I am wary of destroying the kit entirely...

[mixedgas]

Your pictures do not quite show what I need to know. When a technician wires the power supply, he/she usually ties off the spare power input wires. One color is for 220, other color is 110, and then there usually is a ground and a neutral. Are there any other wires under the heatshrink on the PSU???

BTW, Your supply is a JDSU, its made by Melles' competitor, not Melles... You need a manual or PDF from JDSU.

How many cm long is the tube? That "brick" looks like its for a much longer laser.

Steve

[tolland]

Thanks for the reply! I've added some details below...

Your pictures do not quite show what I need to know. When a technician wires the power supply, he/she usually ties off the spare power input wires. One color is for 220, other color is 110, and then there usually is a ground and a neutral. Are there any other wires under the heatshrink on the PSU???

The brick has a red/black pair going off to the laser, and a set of 5 wires, Brown, Blue, White, Green and Purple, going to a 6 pin female molex style connector and fuse assembly;


The purple wire is tied in a loop back into the rubber sleeve.

The blue wire goes off to the 6 pin molex style connector here, but there is nothing connected to the corresponding pin, so it is open.



The white cable goes off to the 3A quick blow fuse assembly, and returns as a black wire to the 6-pin molex style connector, and is linked to the black wires on the other side of the molex-style connector to mains neutral.



The brown wire terminates at the 6 pin connector, and is connected on the other side to the red cable to mains live.

BTW, Your supply is a JDSU, its made by Melles' competitor, not Melles... You need a manual or PDF from JDSU.

How many cm long is the tube? That "brick" looks like its for a much longer laser.

The laser outer dimension length measures 485mm end to end; and repairfaq.org (http://www.repairfaq.org/sam/laserhcl.htm#hclmgrd) lists the 05-LHP-991 as having a 440mm tube length;

Minimum e/2 c/2L Supply Nominal (1)
Output Beam Diver- Mode Opr/Strt Tube Tube Size Model
Power Diam gence Spacing (Rb=75K) Current Diam/Lgth 05-LHR/P-
------------------------------------------------------------------------------
10 mW .65 mm 1.24 mR 341 MHz 2.64/10 kV 6.5 mA 37/440 mm 991




I'll have a google for the manual for the PSU.

Cheers,
Tom

[tolland]

Your pictures do not quite show what I need to know. When a technician wires the power supply, he/she usually ties off the spare power input wires. One color is for 220, other color is 110, and then there usually is a ground and a neutral. Are there any other wires under the heatshrink on the PSU???

BTW, Your supply is a JDSU, its made by Melles' competitor, not Melles... You need a manual or PDF from JDSU.

Ah. So from the JDSU 380T manual, it seems to be wired for 110 V AC (115 V AC white wire, rather than the 240V blue wire)

[mixedgas]

If a hene supply is wired correctly and is blowing fuses, 95% chance the internal switching PSU that drives the HV multiplier is dead.
In which case it is trashed and you buy a new brick. If you really need the HENE, inexpensive PSUs that academic customers can buy come from Meredith Instruments for the most part. www.mi-lasers.com

Steve

[Solonar]

990's should only need 2800-3000V at 6ma. I've had my 990 since 1987 and the original laserdrive psu is rated at 2800V and 4.5 - 6.5 ma.

[tolland]

990's should only need 2800-3000V at 6ma. I've had my 990 since 1987 and the original laserdrive psu is rated at 2800V and 4.5 - 6.5 ma.

According to the doc, the JDSU PSU is a constant current device at 6.5mA;
http://www.jdsu.com/productliteratur..._ae_121205.pdf

"All JDSU helium-neon power supplies provide a highly regulated constant current output, allowing for excellent optical stability and performance. The power supply automatically adjusts laser tube voltage to maintain a fixed discharge current. A CDRH time delay is active on all power supplies, and may be defeated on power supply modules. "

[tolland]

If a hene supply is wired correctly and is blowing fuses, 95% chance the internal switching PSU that drives the HV multiplier is dead.

How would I test the brick? It would seem I would need a 3500V/6.5mA=538.5 k Ohm load that can handle 22 watts....