Operating in CI Mode 5
5977B Series MSD Operating Manual 137
To Perform an NCI Autotune (Methane Reagent Gas)
Procedure
1 From the Tune and Vacuum Control view, load NCICH4.U (or an existing tune
file for the reagent gas you are using).
2 From the Setup menu, select the CI Tune Wizard and follow the system
prompts.
Accept the default temperature and other settings.
If you use an existing tune file, be sure to save it with a new name if you
don’t want to overwrite the existing values.
3 Under the Tune menu, click CI Autotune.
There are no tune performance criteria. If autotune completes, it passes. (See
Figure 45 on page 138.) If the tune sets the EMV at or above 2,600 V, however,
you may not be able to acquire data successfully if your method sets EMV to
“+400” or higher.
Always verify MSD performance in EI before switching to CI operation. (See “To Verify
EI System Performance” on page 108.) Always set up the CI MSD in PCI with methane
as the reagent gas first, even if you are going to be using a different reagent gas or
going to run NCI.
Avoid tuning unless absolutely necessary; this will minimize PFDTD background noise
and help prevent ion source contamination.
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