To those of you with the Los Gatos Research liquid water instrument,

Does you ring-down time change?

Historically, we had version 1 of this instrument, the ring-down time 
would be about 7.2 us (micro seconds). This particular instrument would go 
back to LGR for cleaning and recalibration when the ring-down time would 
drop 1-2 us (5 us when we put salt into it...ooops). We recently had this 
instrument upgraded to version 2 and had an initial ring-down time of 6.2 
us. I know the exact ring-down time is specific to each instrument. Last 
month, our instrument, again, dropped by 1 us to 5.2 us. This change was a 
step function and happened between injections at a time when no person was 
in the lab.

I am wondering if any of you see big changes in your ring-down time and 
if so, what you do about it? Along with this drop in ring-down time, we 
see poor precision. Thank you.

andy

Andrew Schauer
Earth and Space Sciences
University of Washington
Seattle, WA 98195

206.543.6327
[log in to unmask]
http://depts.washington.edu/isolab/