Aloha  Jason

In the “Method" under the "Peak Detection Tab” open advanced parameters.  Set the “Start Detection” time after the “jump” peak.


William Hiscock, Ph.D.
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Thermo Fisher Scientific
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On Oct 14, 2014, at 3:08, Stefan Schloemer <[log in to unmask]> wrote:

Dear Jason,
have you tried to simply exclude this relevant time window from the peak integration (its somewhere in the peak detection tab)?
Von: Stable Isotope Geochemistry [mailto:[log in to unmask]] Im Auftrag von Matthew Lachniet
Gesendet: Montag, 13. Oktober 2014 17:49
An: [log in to unmask]
Betreff: Re: [ISOGEOCHEM] noise on peak jump - TCEA
Hi Jason - I had a similar problem. My work around was to put a "dummy peak" of ref gas CO after the spike from the peak jump but before the unknown CO pulse, with a 3 second duration. The software would then consistently recognize this dummy peak as distinct from the unknown CO pulse consistently (mostly) so that the appropriate peaks could be set in the method for the standards and unknown. 
Maybe this is a bug in the software as when our TCEA was set up I was told the software was not supposed to recognize the peak jump as a distinct peak, yet it does. 

On Monday, October 13, 2014, Jason Curtis <[log in to unmask]> wrote:
Hi All,
When running our new TC/EA with ConFlo IV into a Delta V Plus with Isodat 3 I get a very large spike right at the peak jump from H to CO.  The problem is that the software recognizes this as the start of the CO peak.  The actual CO peak comes out something like 10-15 seconds after the peak jump.  As a result of this electronic noise I have to manually redefine the peak for every sample.
You can see a screen shot of what it looks like here:
I can not see a method setting to stop the software from recognizing this spike as part of the sample peak.  I am sure that I am just missing something.  Any suggestions as to how to correct my method would be appreciated!
Thanks in advance,

Jason Curtis, Ph.D.
Stable Isotope Mass Spec Lab manager
Senior 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