User`s guide

Impact of Changing Instrument Settings Parameters
Voyager
™
Biospectrometry
™
Workstation User’s Guide 5-41
5
5.3.2 Understanding Grid Voltage%
NOTE: You must calibrate the mass scale for each Grid
Voltage% you use. See Data Explorer Software User’s
Guide, Section 5.3.2, Manually Calibrating, for more
information.
Grid Voltage% works in conjunction with Accelerating Voltage
(described in Section 5.4.4.2, Setting Accelerating Voltage) to
define an adjustable potential gradient or electric field in the
ionization region of the ion source. This adjustable potential
gradient can be fine-tuned to obtain optimum performance:
• In Delayed Extraction mode, you must fine-tune Grid
Voltage% in conjunction with Delay Time to optimize
resolution. See Section 5.4.3, Optimizing Resolution.
• In PSD mode, you can use higher Grid Voltage% settings
than the optimum Reflector mode settings. Higher Grid
Voltage% improves fragment ion resolution and the
resolution at the position of the Precursor Ion Selector
(see Figure 7-15 on page 7-45). The standard .BIC files
provided on your system for PSD mode include Grid
Voltage% settings that are approximately 5 percent
higher than the Grid Voltage% settings in the .BIC files
provided for Reflector mode. For more information, see
Chapter 7, PSD Analysis.
For more information on Grid Voltage%, see:
• Section 5.4.3.5, Optimizing Grid Voltage%
• “Grid Voltage%” on page 5-17