Subject: RE: Raith problem --> NO PROBLEM !!
From: "Joseph Klingfus" <>
Date: Wed, 14 Jul 2004 00:05:04 -0500

 Wed, 14 Jul 2004 00:05:04 -0500
Greetings users.

There is nothing wrong with the pattern generator.  

A key observation is that the Magnification Display of the LEO was not set
to Polaroid.  This is not the first time I have heard of this happening.  It
is set correctly when a user account is first added, but then somehow
becomes set to current output device.  So far we are not able to repeat how
it occurs.  Please check this setting the next time you log onto the SEM.

Important notice concerning "zoom exceeds limits"....
If you have never experienced this message before, then you have probably
always used a default WF size and have never tried to setup your own WF
size.  Within the Microscope Control window the relationship between
microscope MAG and WF size is only a very "course" field setting.  The "fine
tuning" is done with the AlignWF procedure and the resultant field scale
parameters (zoom, shift, rot.) are displayed/stored in the Align WF window.
There are max limits set on the DACs to keep their output response linear.
If "zoom exceeds limits" then just decrease the MAG for the given WF size,
this will decrease the needed zoom value.  This message is in no way an
indication that there is a deficiency or problem with the tool.


-----Original Message-----
From: Luigi Scaccabarozzi [] 
Sent: Tuesday, July 13, 2004 11:15 PM
To: raith@snf.Stanford.EDU
Cc:; Kahl, Michael; jwc@snf.Stanford.EDU
Subject: Raith problem

Hi all,
ryan and I have found problems today in WF alignment. The error is
"Zoom(Y) exceeds limit". I tried resetting and shutting down computers and
Elphy, but no way. I tried WF align at WD 4.6 to 10 mm and the numbers of WF
correction are the same. It looks like that the Elphy is stuck on those
numbers (zoom X=1.49, zoom Y=1.52). I talked to James, and he says to try
again tomorrow morning (Ryan is next user) after leaving the Elphy OFF for
~20 min (which I just did). If it still does not work, tomorrow morning we
can call him and/or Raith. If people from Raith have any idea or suggestion
are welcome otherwise James plan is to have another Elphy shipped here

One more thing. I noticed that the option on LEO Tools-> Preferences-> SEM
condition-> device was set to current device instead of POlaroid 545. No
idea how that could have been switched but check your account. If polaroid
is not selected, Align writefiled will definitely not work. If you have the
wrong option, select polaroid, click apply and reboot both systems.

Any help welcome