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Electron Microprobe Lab, University of Minnesota

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Anthony,
	Make sure that the pump itself can pull an appropriate vacuum
without being attached to the system. Try removing the foreline trap if you
have one as they can be an issue if not taken care of properly.  It is also
possible that there is actually a leak in the system.  Primary suspect seals
would be the specimen exchange area and the gun or any other area that has
recently been taken apart.  Check o-rings for fibers, cracks etc.
John Hunt

-----Original Message-----
From: JEOL-Focused Probe Users List [mailto:[log in to unmask]] On
Behalf Of Anthony J. Ruth
Sent: Friday, July 01, 2011 11:50 AM
To: [log in to unmask]
Subject: [PROBE-USERS] disabling 30 minute timer

JEOL Probe Users Listserver

Moderator: Ellery Frahm, [log in to unmask],
Electron Microprobe Lab, University of Minnesota

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The superprobe I am working on is having vacuum trouble. We need to run the
roughing pump for an extended period of time to reach low vacuum and turn on
the
diffusion pump, but there is a timer that turns off the system if high
vacuum is
not reached in 30 minutes. How can I disable the timer? I have tried
adjusting
the potentiometers on the manual pump control panel so that all three
pressure
meters report high vacuum, but it still did not disable the timer.