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Section 4. Auto Tuning
Auto tuning a 4000 MS is significantly different from auto tuning a 2X00 MS. This
section offers descriptions of the 4000 MS auto tune processes with the
assumption that preliminary tuning such as the RF Ramp, Endcap Trapping Field
Dipole, and Cal Gas adjustments were done previously. Be aware that the Cal
Gas adjustment may need to be re-visited after running the auto tunes and that
the auto tunes should be re-run after re-adjusting the Cal Gas needle valve
because each of these two features (Cal Gas adjustment and auto tuning) can
affect the other.
4.1 Internal Auto Tuning
INTERNAL EI and CI
Ensure the GC column is delivering approximately 1 mL/min of helium flow into
the trap cavity.
From the Auto Tune page in System Control, click
Select All
, and then click
Start
Auto Tune (refer to figure 4.1).
It is not necessary to run the auto tunes again for the alternate filament in internal
mode. The values generated by this auto tune should work well for both EI and
CI acquisitions in internal mode.
Figure 4.1
Summary of Contents for 4000 GCMS
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