
Impact of Changing Instrument Settings Parameters
Voyager
™
Biospectrometry
™
Workstation User’s Guide 5-43
5
For example (Figure 5-8), with a 25,000 V Accelerating
Voltage and a Grid Voltage of 56%, the potential gradient is:
Vary the potential gradient by varying the Grid Voltage% and
use the recommended Accelerating Voltage for the mass
range. For more information, see Section 5.4.4.2, Setting
Accelerating Voltage.
Maximum allowed
potential
difference
The Voyager Instrument Control Panel and electronics allow a
maximum absolute potential difference of 10,000 V between
the Accelerating Voltage and the voltage applied to the grid
(Grid Voltage%).
You can calculate the potential difference using the following
equation:
Accelerating Voltage x (100 - Grid Voltage% / 100)
Grid Voltage%, in conjunction with Delay Time, has a direct
impact on resolution. See Section 5.1, Loading, Modifying,
and Saving Instrument Settings, for more information.
Adjusting
In general:
• A higher Grid Voltage with a lower potential difference,
decreases ion fragmentation.
• Grid Voltage% has a large impact on the quality of data
obtained. For each Grid Voltage% setting, there is an
optimum Delay Time.
Potential
gradient
=
25,000 - 14,000 V
2.8 mm
11,000 V /2.8 mm
=
3,928 V /mm
=
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