2-8 Tuning the instrument
Peak display showing centralized nitrogen peak
7. On the Source tab, enter the following parameter values:
Tune window Source page parameter values
Parameter Value
Electron Energy (eV) 35
Note: Enter 70 if a GC column is not
fitted, or standard scanning is being
performed.
Trap (µA) 650
Note: Enter 500 if a GC column is not
fitted.
Ion Repeller (V) Select a value between -7 and -10
Focus 1 Select a value between 400 and 700
Beam Centre 0
Focus 2 Select a value between 4000 and 4500
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