Hi,

in most cases the box/trap values are roughly equal but changes slowly over time in the one or other direction.
As long as your values are stable (i.e. not fluctuating) I would keep it like that. I also had some rare issues with values a bit off (like yours) with new filaments, but besides a lower as normal sensitivity it worked fine.

Robert


> Am 08.10.2017 um 20:15 schrieb Herbert Tobias <[log in to unmask]>:
> 
> Hi All,
> 
> I think I have an issue with Box and Trap current on our MAT 253.
> It's Box=0.57 Trap=0.93
> I get a nonlinear response below 4000mV m/z 44 for CO2.
> 
> I currently can't open the ion source assembly, since I don't have the appropriate gasket material we use. I was wondering if there could be other source to problem, or if the box and trap are still OK in use by other labs. I know they should be ~equal. I can't access Isogeochem archives. It always crashes with gateway problem.
> 
> thanks,
> -Herb
> 
> -- 
> --------------------------------------------------- 
> Dr. Herbert Tobias, Ph.D.
> Associate Professor of Medicine
> 2.828 Dell Pediatric Research Institute
> Dell Medical School
> University of Texas at Austin
> 1400 Barbara Jordan Blvd, Austin, TX 78723
> 1-510-295-3379

-- 
PD Dr. Robert van Geldern
Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) | GeoZentrum Nordbayern
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