Dear all,

Today I check the abundance (. the amount of ions for mass 44 falling into cup 45) of your MAT 253.
I selected as Press Adjust   3000 mV on the 44 cup. The result was a negative value.
The manual says:
"Due to electrons on the left and on the right side of the peak, a negative signal may result. This problem can be overcome by manual adjustment"
So does this mean using a different tuning and the abundance will get positive, or what does manual adjustment mean?



Lukas Flierl
Physikalisch-Technische Bundesanstalt PTB
Metrology in Chemistry, 3.11
Bundesallee 100
38116 Braunschweig, Germany
Tel. +49-531-592-3318
e-mail: [log in to unmask]