Amu Gain; Amu Offset; 219 Width - Agilent Technologies 5975C TAD VL MSD Troubleshooting And Maintenance Manual

Figure 47

AMU gain

AMU gain (AmuGain) affects the ratio of DC voltage to RF frequency on the
mass filter. This controls the widths of the mass peaks.
• Higher gain yields narrower peaks.
• AMU gain affects peaks at high masses more than peaks at low masses.

AMU offset

AMU offset (AmuOffs) also affects the ratio of DC voltage to RF frequency on
the mass filter.
• Higher offset yields narrower peaks.
• AMU offset generally affects peak widths equally at all masses.

219 width

m/z 219 is a prominent ion near the middle of the mass range of PFTBA. The
width 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
you are tuning with a compound other than PFTBA, there may not be an ion at
m/z 219. In that case, set the 219 width to the last value found for it by
Autotune or set it to 0.
5975 Series MSD Troubleshooting and Maintenance Manual
Quadrupole mass filter
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Analyzer
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