
Acquiring PSD Data with Standard Instrument Settings (.BIC) Files
Voyager
™
Biospectrometry
™
Workstation User’s Guide 7-21
7
7.3.2 Determining the
Number of Segments to Acquire
for a Complete Composite Spectrum
This section includes:
• Resolution and the number of segments
• Decrement ratio
• Default Mirror Ratio settings
• Size of segments
• Default number of segments
• Acquiring only select segments
Resolution and
the number of
segments
If you are interested in a complete composite spectrum, the
number of segments you need to acquire is determined by:
• Resolution you require
• Mass range of interest
You see better resolution in the composite spectrum with more
segments.
NOTE: If you are interested in selected fragment masses
only, instead of a complete composite spectrum, see
“Acquiring only select segments” on page 7-23.
Use the following equation to determine the number of
segments to acquire:
where:
D
m
f
Fragment ion mass of the lowest mass of interest
Decrement Ratio, which determines the size of the segment=
=
n = Number of segments
m
p
Precursor ion mass=
n ~ ln (m
f
/ m
p
)
lnD
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