On Fri, Aug 29, 2014 at 12:48 PM, Jerry Biehlerwrote: > If you are trying to get to 10^-8 right now forget the stopper. It is never going to happen with a seal like that. How many connections do you need? What kind of pump are you using to get that low? What kind of chamber? Oh, why not? I mean, the seal on the blocking plate is just a Viton o-ring... The setup is an FEI 200 xP, it's got a roughing pump, a turbo, and a ion trap. I need at least 3 wires to begin, I might be able to get away with 2 if I use the feed-through metal for the ground. _______________________________________________ Hosted by the MEMS and Nanotechnology Exchange, the country's leading provider of MEMS and Nanotechnology design and fabrication services. Visit us at http://www.mems-exchange.org Want to advertise to this community? See http://www.memsnet.org To unsubscribe: http://mail.mems-exchange.org/mailman/listinfo/mems-talk