From: eanders@uconnvm.uconn.edu
  To  : Joel Mackay , rasmb@alpha.bbri.org
  Date: Tue, 10 Oct 2000 11:08:40 -0400

Absorbance OD instability

Joel, 
 We have seen this problem crop up a few times.  It is a problem 
with the software version and Firmware (EPROM) versions that you 
are running.  We solved this problem by returning to software 
version XLI-3.01H and the correct EPROM's (DAB V 3.02 and ISB 
V2.10) for this software version.  Your Beckman Rep should be able 
to deal with this problem.  

Out of curiosity, which version of software and firmware do you 
have?

Eric Anderson
NAUF 

> Actually, while i am 'here', we also sometimes see the scans 'jump
> around', such that there are two distinct sets of overlapping scans in the
> one cell. I have explained this effect to myself by supposing that the
> monochromator is not selecting exactly the same wavelength each time it
> goes to that cell. The same questions as above apply here!