4 Operating in EI Mode
To Perform High-Mass Testing
5977C GC/MSD Operating Manual 107
Results
Results will indicate the recommended amount to adjust AMU offset for high
mass. If your results are within 5 units of the targeted amount, there is no need to
make adjustments.
Adjustments
1 Verify the autotune file (atune.u, HES_atune.u, etune.u) has been loaded.
2 In Instrument Control view select Edit Tune Parameters from the Instrument
menu to display the Manual Tune dialog.
3 Click the Dynamic tab and then click the Amu Offset sub-tab.
4 Select the Enable This Lens checkbox.
5 Enter the recommend dynamic offset Voltage (V), and click OK.
6 Click Save to save this dynamic Amu Offset for the high-mass.
You can overwrite the existing autotune file to include high-mass
adjustment or save this file to a new name, for example, ATUNEHIGH.U.
When an autotune is performed, it will overwrite this dynamic Amu Offset
that was entered. This is why you might want to rename the tune.
7 Click Done to close the Manual Tune dialog.
8 Load the PFHT.M, then load the saved tune file, and then save the method.
9 Rerun test mixture (repeat high-mass checkout). If the correction is within
5 units, no further adjustments are required.
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