Forwarded for Bert Planting. -------- Original Message -------- Subject: Re: Laser Safety List-Post: emc-pstc@listserv.ieee.org Date: Mon, 18 Jun 2001 06:59:41 +0200 From: Bert Planting <bert.plant...@asml.com> Organization: ASML To: Matt Kilkenny <mkilke...@opthos.com> CC: emc-p...@majordomo.ieee.org References: <0954d2e4fe26d411909100b0d022a345191...@mail.opthos.com>
Matt, Because you are using a microprocessor limitating it this is not seen as sufficient safe solution for reduction of the output by "safety" people (based on my experience with US third parties). Reduction should only be done by hardware and not by fault sensitive microprocessor. In this case you should use an interlock. regards, Bert Planting Prodct safety ASML Matt Kilkenny wrote: > > I have a question on lasers for ITE concerning IEC-825 and FDA requirements. > According to IEC, class 3b lasers have to have safety doors (interlocks). > Can automatic power reduction be used if you are not pumping the laser to a > 3b class level of power. In other words, can we not put interlocks on the > system if the 3b laser power has been reduced to a 3a or class 1 level > through microprocessor limitating it? Or is their single fault concerns if > the microprocessor fails? > > Thanks for any help, > > Matt Kilkenny > mkilke...@opthos.com ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: pstc_ad...@garretson.org Dave Heald davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.rcic.com/ click on "Virtual Conference Hall,"