Waters Autospec Premier Operator's Manual page 132

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Calibration report window with large residual errors
To manually adjust the large residual error peaks
1.
Zoom in on the mass region of a mismatched peak by clicking and
dragging over the region.
Click Default to zoom out.
Tip:
2.
Right-click just to the right of, and just below, the top of the mismatched
reference peak in the reference spectrum pane.
3.
Right-click on the required peak in the spectrum pane.
Result:
4.
Repeat
Once the correct peaks have been selected, the residuals must all be
reasonably consistent and have no obvious outlying points.
5-8
Calibrating the instrument
The calibration is updated with the new point.
steps 1 to 3
for any other mismatched peaks.

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