HP Data Explorer 4 Series Manuel d'utilisateur Page 158

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Chapter 3 Peak Detection and Labeling
3-60 Applied Biosystems
3
Charge state
not displayed
If no charge is displayed, there are a few possible causes:
Peaks are more than 1 Da apart.
Filter width is set too high to detect other isotope peaks.
The maximum charge state for charge state
determination is set lower than the charge state of the
peak.
Charge state determination parameters are set such that
peaks are determined to have no charge. See
Section 3.2.5, Charge State Determination and
Examples.
Peaks are not from the same isotope species.
NOTE: If you set %Base Peak Intensity or %Max Peak
Area too low (described on page 3-20), noise peaks
can be detected, and charge states can be incorrectly
labeled.
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