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Chapter 5 Examining Spectrum Data
5-6 Applied Biosystems
5
The manual calibration feature provides two modes for peak
matching:
• Automatic—The software automatically compares
reference masses to observed masses, and lists peaks
that are within the specified peak matching criteria.
• Manual—You manually select an observed mass, then
select the reference mass for comparison.
Hint: It is often useful to automatically perform a match and
fit first, then manually adjust the fit as needed.
Calibration
references files
(.REF) provided
Default calibration reference files are provided with the
software. You can use these files as a starting point and add
delete reference masses as needed.
For information, see Section 5.3.3, Creating or Modifying a
Calibration Reference File (.REF).
When to use
manual
calibration
Use manual calibration when you:
• Calibrate Voyager data
• Calibrate Mariner data and any of the following occur:
• You have one or only a few spectra to calibrate
• You do not know in advance which reference
masses to use
• You do not know in advance if the quality of the
reference mass signals is acceptable
• You want to fine-tune the results of an automatic
calibration
For information on automatic calibration, see Section 5.4,
Automatic Calibration.
Accurate mass
measurements
Before performing an internal calibration, refer to the:
• Mariner Workstation User’s Guide
• Voyager Biospectrometry Workstation User’s Guide