Voyager DP-263-S Guía de usuario Pagina 303

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Optimizing Instrument Settings Parameters
Voyager
Biospectrometry
Workstation User’s Guide 5-73
5
Optimizing Grid
Voltage%
To optimize Grid Voltage%:
1. Open a standard .BIC file for the mass range you are
acquiring. For more information, see “Selecting a .BIC
file” on page 5-8.
2. Acquire a spectrum and observe the resolution. For more
information, see Section 6.5.2, Calculating Mass
Resolution.
If the resolution is not acceptable, increase the Grid
Voltage% (by 0.5 percent for Linear mode, or 1.0 percent
for Reflector mode), acquire a spectrum and observe.
Leave the Delay Time setting unchanged.
If the signal is saturated at the higher Grid Voltage%
setting, decrease the laser and acquire a new
spectrum. If the signal decreases at the higher Grid
Voltage% setting, increase the laser and acquire a new
spectrum.
Hint: If you are analyzing a mixture and the resolution
on the peak of interest is not acceptable, observe the
resolution of a higher mass peak and a lower mass
peak. If resolution is better on the higher mass peak,
increase the Grid Voltage% setting (by 0.5 percent for
Linear mode, or 1.0 percent for Reflector mode). If
resolution is better on the lower mass peak, decrease
the Grid Voltage% setting (by 0.5 percent for Linear
mode, or 1.0 percent for Reflector mode). Collect a
spectrum and observe. Leave the Delay Time setting
unchanged.
3. If the resolution improves by at least 20 percent (you can
see fluctuations in resolution of up to 10 percent with the
same settings), continue increasing the Grid Voltage% (in
0.5 percent for Linear mode, or 1.0 percent for Reflector
mode) increments. Table 5-12 on page 5-69 through
Table 5-14 on page 5-70 list valid Grid Voltage% settings
for different systems and mass ranges.
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