5 Operating in EI Mode
To Tune the MSD in EI Mode
5977B Series MSD Operating Manual 127
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 7890 GC Control
Panel” on page 104.)
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 40.)
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.
6 Click OK to close this dialog and start the tune. If the MSD temperatures are
not stable, you are prompted to wait or override the wait by clicking Override.
Figure 40 Select tune type dialog
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