62 Operation Manual
3 Operating in Electron Impact (EI) Mode
To Autotune the MS for EI Mode
To Autotune the MS for EI Mode
The MS can be tuned using the MassHunter Workstation
software.
Procedure
1 Set the system to the same conditions (GC oven temperature
and column flow, and MS analyzer temperature) that will be
used for data acquisition.
2 In the Instrument Control panel, click the MS Tune icon to
display the GC/Q-TOF Tune dialog box.
3 The current tune file is displayed in the upper left corner of
the GC/Q-TOF Tune dialog box. Verify that the correct tune file
is loaded.
4 If necessary, load a new tune file by clicking on the Files and
Report tab then click on the Load button in the Tune File area.
Select a tune file and click the OK button.
The tune file must match the type of ion source in the
analyzer. If you are using an EI ion source, select a tune file
created for an EI ion source.
5 Click the Autotune tab and select an EI high sensitivity autotune
for the high sensitivity EI ion source with a variable voltage
extractor.
6 Select the Tune from default settings check box if you are
restarting the system after a system vent, major servicing, or
a power outage. If you clear the Tune from default settings box,
the autotune process starts using the previous tune values.
7 Select Save tune file when done check box to save the new tune
parameters generated by the autotune. Do not select this
item if you want to review the autotune report before saving
the newly generated tune parameters.
8 Select the Print autotune report check box to automatically
print a tune report.
9 Click the Autotune button to start the autotune. The Status line
displays the current step in the autotune process and the
plot of the tuned parameter for that step is shown in the top
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