Voyager DP-263-S Guía de usuario Pagina 317

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Before You Begin
Voyager
Biospectrometry
Workstation User’s Guide 6-5
6
When acquiring a
spectrum
When acquiring a spectrum, note the following:
For the first spectrum you acquire, the laser setting saved
in the .BIC file selected is applied. If the laser intensity in
the .BIC is not optimized for the mass range, you may not
see a signal.
Make subsequent laser adjustments as described in
“Adjusting laser intensity” on page 5-58.
To locate an acceptable signal, click-drag the scroll bars
on the Manual Laser/Sample Position control page to aim
the laser at different parts of the sample position.
Samples often contain “hot spots” (areas of high ion
intensity) and “cold spots” (areas of low ion intensity).
When you locate a hot spot, stop acquiring and restart.
When acquiring actual data, do not move the sample
position. You observe the best resolution and mass
accuracy when you collect ions produced from one
location.
NOTE: When analyzing high masses or samples of low
concentration, or when using thin-film matrices (for
example, in polymer analysis or in PSD mode), you
may run out of sample if you acquire from the same
area in the sample position. You may need to move
around on the sample position when acquiring to build
up adequate signal-to-noise ratio.
Before adjusting laser intensity for subsequent spectra,
stop acquisition. The laser setting recorded with the data
file is the last laser setting used.
NOTE: It is good practice to use one laser setting to
acquire a spectrum, but you may need to adjust the
laser intensity to maintain adequate signal intensity.
However, varying the laser intensity during acquisition
may affect mass accuracy.
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