User`s guide

Chapter 5 Optimizing Instrument Settings
5-30 PerSeptive Biosystems
5
Table 5-8 Advanced Parameters
Parameter Description
Mirror to Accelerating
Voltage Ratio
(not available in Linear
mode)
Specifies the ratio between the Mirror Voltage and the
Accelerating Voltage in Reflector mode, to adjust the
voltage of the mirror so that it is slightly higher than the
Accelerating Voltage. A higher voltage is needed at the
mirror to reflect ions. If the voltage at the mirror is equal to
the Accelerating Voltage, ions will pass the mirror.
To reflect intact ions, the Mirror to Accelerating Voltage
Ratio must be close to or greater than 1. Maximum value
is:
30,000V / Accelerating Voltage
NOTE: This parameter influences the tuning
characteristics and default calibration of the instrument.
Do not change this setting unless instructed to do so by a
PerSeptive Biosystems Technical Representative.
Changing this value significantly alters the optimum
settings of Grid Voltage% and Delay Time.
For information on the voltage applied to the mirror in PSD
mode, See Section 7.1, Overview of PSD Analysis.
Timed Ion Selector
(with mass)
Allows analysis of the mass of interest by deflecting other
ions. This parameter is typically only used in PSD mode,
but is available in Reflector mode for advanced
applications. See Section 7.1, Overview of PSD Analysis,
and Section 7.4.2, Observing the Effects
of Precursor Ion Selector, for more information.
NOTE: The Timed Ion Selector in Reflector mode is the
same parameter as the Precursor Ion Selector in PSD
mode. If you change the mass for Timed Ion Selector in
Reflector mode, the Precursor mass used by the
Precursor Ion Selector in PSD mode also changes.