
Optimizing Instrument Settings Parameters
Voyager
™
Biospectrometry
™
Workstation User’s Guide 5-77
5
5.4.4.2 Setting Accelerating Voltage
Overview
Accelerating Voltage defines the energy of ions as they travel
in the flight tube and reach the detector. Efficiency of
detection, particularly for high mass ions, increases with
higher ion energy. Therefore, the maximum Accelerating
Voltage typically yields optimum performance when analyzing
masses above 10,000 Da. However, a lower Accelerating
Voltage can increase flight times, and can improve resolution
in spectra.
NOTE: The calibration of the mass scale changes
significantly when you change the Accelerating Voltage.
Default calibration adjusts for these changes. However, you
will observe more accurate calibration if you use an
external calibration (.CAL) file generated with the same
Accelerating Voltage. See the Data Explorer Software
User’s Guide, Section 5.3.2, Manually Calibrating, for more
information.
Recommended
setting
Higher masses decrease detector sensitivity. To overcome this
effect, set the Accelerating Voltage appropriate for the mass
range you are analyzing:
If you are analyzing very dilute samples, or a sample that
ionizes poorly, use a setting of 25,000 V.
Mass Range (Da) Accelerating Voltage
<1,000 15,000 V
1,000 to 10,000 20,000 V
>10,000 25,000 V
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