Hi Jennifer,


We have a Delta Plus and are running with our X-deflection at 5 at the moment but looking through old tunings ~4 was not unusual. Not sure what causes this though.


Cheers Adrian


From: Stable Isotope Geochemistry [mailto:[log in to unmask]] On Behalf Of Jen McKay
Sent: 20 January 2017 23:51
To: [log in to unmask]
Subject: [ISOGEOCHEM] Strange X-deflection setting


Hi Everyone,


I’m re-tuning one of my DeltaPlus’s and obtain the highest mass 44 sensitivity with an X-deflection value of ~4, which seems low to me.  Replacing the filament doesn’t make a difference and the source is clean.  I’m just wondering what could be causing this.  Any ideas?


Take care,






Jennifer McKay
Assistant Professor (Senior Research)
Stable Isotope Lab Manager
CEOAS, Oregon State University
Corvallis, Oregon 97331