4Operating in EI Mode
104 5977B Series MSD Operating Manual
To Tune the MSD in EI Mode
You can also use the 7890B GC control panel to run the autotune that is
currently loaded in MassHunter. (See “Operating the MSD from the GC control
panel” on page 81.)
Procedure
1 Load the method that will be used for data acquisition.
2 In the Instrument Control view, verify the correct tune file is displayed in the
tile bar. For most applications, Autotune gives good results.
3 To select a different tune file select MS Tune File from the Instrument menu to
display the Select Tune File dialog. The Settings area displays the important
parameters for a selected tune file.
The tune file must match the type of ion source in the analyzer. If you are
using an EI source, select a tune file created for an EI source.
4 Click the MS Tune icon to display the Select Tune Type dialog. (See Figure 32.)
5 Select Tune MSD to perform a complete autotune, or select Quick Tune to
adjust peak width, mass assignment, and abundance, without changing ion
ratios.
Figure 32 Select tune type dialog
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