Dear all, Richard Meister wrote: We have ... an old Coherent Innova 90 which we have been using for its UV wavelengths. Unfortunately, it has been running "over pressure" for some time, and now gives me an "under voltage" error message. It now will not operate in "light regulation" mode, IMHO this sounds like a problem with the gas pressure/tube voltage circuit. When we had such a laser, the Coulter engineer used to stress the importance of calibrating this circuit regularly. He showed me how to do it and I succeeded in calibrating it several times. However I was always uneasy and ended up deciding that the risk of electrocution was too high, we reverted back to paying Coulter to do it for us. Anyway, it may be worth enquiring if your tube can be fixed or if it irreversibly damaged. Regards Nigel Nigel Blackhall Senior Experimental Officer Plant Science Division School of Biosciences University of Nottingham Sutton Bonnington Campus Lougborough Leicestershire tel +44 (0) 115 9515151 ext 18501 fax +44 (0) 115 9516334 mobile 07810 123410
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