I-90 laser problem

Frederic Preffer preffer at helix.mgh.harvard.edu
Fri Jun 21 15:36:04 EST 2002

Dear Arnold

The man who knows all at EVERGREEN laser, Phil Fostini, can likely suggest
a solution...

F Preffer

At 11:32 AM 6/21/02 +0100, Arnold Richard Pizzey wrote:
>Greetings all,
>I am experiencing a problem with my I-90, If I try to advance the current
>beyond 25A I get a lot of electrical noise -sounds a bit like arcing but
>I've checked all components on the power supply and laser head and find no
>evidence of this.
>The voltage across TP16-36 is 240V with the tube not struck and 190V at 25A
>also the relay next to TP28 keeps closing -I think that the tube might be
>trying to take gas fills but I think that the autofill has been disconnected.
>If anyone has any experience of this problem I'd appreciate it if they let
>me know
>	Arnold Richard Pizzey
>	Department of Haematology
>	Royal Free and University College London Medical School
>	98 Chenies Mews
>	London WC1E 6HX
>	U.K
>	voice:	+44 020-7679-6234
>	Fax:	+44 020-7679-6222
>	email:	a.pizzey at ucl.ac.uk
Frederic I. Preffer
Department of Pathology
Charlestown Navy Yard- 7140
149 13th Street
Massachusetts General Hospital -East
Charlestown, MA 02129

voice	  [617] 726-7481
fax	   [617] 724-3164

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