
Chapter 7 PSD Analysis
7-30 PerSeptive Biosystems
7
Typing or
selecting new
values
To type or select new values in the segment list:
1. Type in new values for Mirror Ratio or Guide Wire% in
any row in the table. You can specify Mirror Ratios in
any order in the table.
NOTE: When you click on the Mirror Ratio field, the
entry is displayed with more than three-digit precision,
which is the precision used to calculate the mass range
for the segment during the analysis.
You can specify the same Mirror Ratio for multiple
segments if needed. When the composite spectrum is
generated, the software uses the most recently
acquired segment if duplicate Mirror Ratios are present.
Observe the Max Stitch Mass when you type a Mirror
Ratio. Optimum focus and resolution is achieved for
fragment ions close to this mass.
2. To select new values for Vertical Scale or Input
Bandwidth, click on the cell.
A drop-down list of values appropriate for your system
is displayed. Select a value.
Using the Fill
Down function
To use the Fill Down function:
1. If you want the Fill Down function to calculate values for
Mirror Ratio and Guide Wire% (instead of copying the
value from the first row), set the following in the Mirror
Ratio/Guide Wire% Fill Down section:
• Decrement Ratio—To calculate the needed Mirror
Ratios. For more information, see “Decrement
ratio” on page 7-22. Increase this value to create
smaller segments. Decrease this value to create
larger segments.
• Guide Wire% Tracks Mirror Ratio—If you want
to automatically adjust the Guide Wire% settings
according to the Mirror Ratio setting.
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