
Chapter 5 Optimizing Instrument Settings
5-18 PerSeptive Biosystems
5
Guide Wire Voltage% Voltage applied to the beam guide wire. Overcomes the
dispersion effect from the source and refocuses ions on the
detector.
The valid range for Guide Wire Voltage% is 0.000 to 0.300%
of the Accelerating Voltage:
• Linear mode—Use 0.05 to 0.3% as suggested by the
standard instrument settings, and increase the Grid
Voltage% with increasing mass.
• Reflector mode—Use 0.00 to 0.050% as suggested
by the standard methods.
• In PSD mode—Use settings
≤
0.02%. Higher settings
may compromise the selectivity of the Precursor Ion
Selector.
See Section 5.3.4, Understanding Guide Wire Voltage%,
and Section 5.4.3.3, Optimizing Guide Wire Voltage%, for
more information.
Delay Time (nsec) Works in conjunction with the Delayed Extraction
parameter. Time in nanoseconds (after the laser ionizes
the sample) at which full Accelerating Voltage is applied,
creating the potential gradient that accelerates ions.
Recommended range is 0 to 3,000 nsec. Optimize in
conjunction with Grid Voltage% (described on
page 5-17).
See Section 5.3.3, Understanding Delay Time, and
Section 5.4.3.4, Optimizing Delay Time, for information.
Table 5-4 Instrument Settings Parameters (Continued)
Parameter Description
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