
80
Increase the CI gas pressure by adjusting the CI needle valve on the front of the
2000. Turn the knob clockwise to increase the pressure. When the pressure is
correct you will see the picture below.
If you increase the pressure too much, you will see a picture like the one below
and you will have to decrease the pressure until you get the picture above.
Once the pressure is adjusted properly you are finished and ready to perform
chemical ionization experiments.
Autotune Mode
It is necessary to perform an auto tune when the instrument is first setup.
Additionally, you must recalibrate the mass axis (FC-43 Mass Calibration)
whenever the temperature, axial modulation, or rf adjustment is changed. Each
time the system is shut down the auto tune must be performed when it is
restarted.
There are four major sections to the Auto Tune window: the Control and Status
display, the Method & Set Points, the Operating Conditions display and the
Spectrum and Event Message window.
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