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HAPSITE ER Operating Manual
9.4.10.1 Tune Parameters
Target Resolution . . . . . . . . . . . . . . Decreasing the Target Resolution narrows
the peak, increases the resolution and lowers
the peak percentage. Increasing the Target
Resolution will widen the peak which
decreases the resolution and increases the
peak percentage.
Emission . . . . . . . . . . . . . . . . . . . . . Turns the filament on and off. Green signifies
that the Emission is on.
EM . . . . . . . . . . . . . . . . . . . . . . . . . . Turns the electron multiplier on and off.
Green signifies that the electron multiplier is
on. Range is 1000 to 2000.
EM Volt . . . . . . . . . . . . . . . . . . . . . . Increases or decreases the gain of the
system. EM voltage should be set to a value
that achieves a Base Peak Gain between
0.4 and 0.6.
Emission Current . . . . . . . . . . . . . . Optimizes the ionization efficiency of the
ionizer. Emission Current is set to achieve
maximum intensity for mass 117. Range is
300 to 400. (350 is typical.)
Extractor Volt . . . . . . . . . . . . . . . . . Optimizes the ionization efficiency of the
ionizer. The Extractor Volt setting must be
set to achieve maximum intensity for mass
117. Range is 70 to 90.
Focus Volt . . . . . . . . . . . . . . . . . . . . Optimizes the ionization efficiency of the
ionizer. The Focus Volt setting must be set
to achieve maximum intensity for mass 117.
Range is 2 to 9.
Threshold . . . . . . . . . . . . . . . . . . . . Threshold determines if a measured point is
used in the peak area integration. If the point
is used, the baseline is subtracted before
use. The threshold should be set within one
standard deviation of the baseline.
Baseline . . . . . . . . . . . . . . . . . . . . . The Baseline is the mean value of the
measured noise level.
Reverse Rod Polarity . . . . . . . . . . . Changes the rod polarity on the mass filter
and select the rod polarity that provides
optimal performance at mass 117.
TP. . . . . . . . . . . . . . . . . . . . . . . . . . . The total MS pressure. Must be below 6E-03
for instrument to operate.
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