Hi Tot
	It looks to me that you have 14 volt (14000 millivolt) 
collectors on the deltaplus.  If this is so than you are maxing out 
the collectors and when this happens the computer just quits taking 
info from the collector(s) until the signal is back below saturation. 
Reduce sample size and the problem will be solved.  Jason



>A couple of times recently, we've encountered a problem with the 
>results of a sample. We're not sure if it's a software error, GPIB 
>issue, or related to recent power fluctuations and outages that 
>include the building housing the facility.
>The problem in question is best explained with the screenshot located at:
>http://comp.uark.edu/~tmillic/curve_bad.jpg
>A normal curve can be seen at:
>http://comp.uark.edu/~tmillic/curve_good.jpg
>Has anybody else encountered this?
>Thank you,
>-Tom
>
>University of Arkansas Stable Isotope Laboratory


-- 
Jason Curtis, Ph.D.
Stable Isotope Mass Spec Lab manager
Associate-In Geochemistry
Department of Geological Sciences
241 Williamson Hall
University of Florida
Gainesville, FL 32611
[log in to unmask], office 352-392-2296
lab 352-392-3344, fax 352-392-9294