Subject: Comment raith SNF 2012-07-19 14:25:52: EHT trip 519 for unknown reason
From: jwc@snf.stanford.edu
Date: Thu, 19 Jul 2012 14:25:53 -0700

An unidentified cause possibly a voltage spik eor inductive ripple through the house
mains has resulted in a Extra High Tension trip in the FE-Gun Power supply.  After a
short rest period to check out sub-systems on the system we restarted the FE-Gun and
after two hours have returned to normal emission values albeit with elevated vacumm
levels  in the system chamber.
All Users are requested to be vigilent and careful in their operation of the tool and
to report any anomalys encountered.
The only other unusual event is that the Z coder counts errored on one move earlier
in the morning. Homing the stage to recalibrate did not resolve any significant delta
in WD or Z calibrations.
RAITH Field service has been informed and consulted with.
JWC