Voyager DP-263-S Guía de usuario Pagina 423

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Acquiring PSD Data with Standard Instrument Settings (.BIC) Files
Voyager
Biospectrometry
Workstation User’s Guide 7-19
7
7.3.1 Determining the Precursor Ion Mass
Overview
Before beginning an analysis in PSD mode:
Generate a precursor spectrum in Reflector mode to
determine the mass of the precursor ion. A Reflector
mode analysis provides optimum resolution and mass
accuracy.
Generate an external calibration for the precursor ion to
use during the PSD acquisition.
Generating the
precursor
spectrum
To generate the precursor spectrum:
1. Open the PSD_Precursor.BIC file provided. This is a
reflector mode instrument settings (.BIC) file. All other
settings should be identical to the settings in the PSD
mode .BIC you will use to acquire segments.
2. Modify the mass range and optimize other parameters as
needed. See Chapter 5, Optimizing Instrument Settings.
3. In the Calibration section of the Instrument Settings
control page, select the matrix you are using. See
“Calibration” on page 5-20.
4. From the View menu, select Data Storage. Set
parameters as needed. See “Setting Data Storage
parameters” on page 6-14.
5. In the Manual Laser Intensity/Sample Positioning Control
page, select the sample to acquire. See “Selecting sample
position and laser intensity” on page 6-13.
6. To start acquiring, select Start Acquisition from the
Acquisition menu, or click .
7. Acquire the spectrum using a laser intensity that does not
generate fragments.
8. Save the data file by clicking .
The precursor spectrum is displayed in the Current
trace in the Spectrum window, and the .DAT file is
saved in the directory specified.
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