2247 AnalyzerMass filterAMU offsetAMU offset (AmuOffs) also affects the ratio of dc voltage to RF frequency on themass filter.• Higher offset yields narrower peaks.• AMU offset generally affects peak widths equally at all masses.219 widthm/z 219 is a prominent ion near the middle of the mass range of PFTBA. Thewidth parameter (Wid219) makes small corrections to the m/z 219 peak width.Amu gain and amu offset must be readjusted after the 219 width is changed. If youare tuning with a compound other than PFTBA, there may not be an ion at m/z219. In that case, set the 219 width to the last value found for it by Autotune or setit to 0.
