Micromass Quattro Ultima, User Manual

Page: 129 / 227

Manual Calibration
To perform a manual calibration using the acquired data:
From the chromatogram window call up the calibration file
STATMS1
.
Determine the scan numbers at the beginning and end of the chromatogram peak
for the reference solution.
This can be achieved using
Process
,
Combine Spectra
and using the left
mouse button to drag across the peak. The start and end scans are displayed in
the combine spectra dialog box.
Return to the Calibrate dialog box. Access
the manual calibration options, as shown,
by selecting
Process
,
Calibration From File... .
Select
Static
calibration type and
MS1
.
In the lower area the data file STATMS1
should be selected automatically. If this is
not the case the correct file can be
selected by clicking on
Browse... .
Enter the start and end scans of the
reference data in the
From and To boxes.
Select OK to perform the calibration and
display the calibration report on the screen
(opposite upper).
This report contains four displays:
the acquired spectrum
the reference spectrum
a plot of mass difference against mass (the calibration curve)
a plot of residual against mass.
An expanded region (opposite lower) can be displayed by clicking and dragging with
the left mouse button. In this way the less intense peaks in the spectrum can be
examined to check that the correct peaks have been matched. The peaks in the
acquired spectrum which have been matched with a peak in the reference spectrum are
highlighted in a different colour.
Compare the acquired and reference spectra to ensure that the correct peaks have
been matched.
Mass Calibration
Page 129
Quattro Ultima
User's Guide