Agilent Technologies 5975T LTM GC Operation Manual page 93

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 ATUNE.U has been loaded.
2 Select Edit Tune Parameters from the Instrument menu via Instrument
3 Click on MoreParams and select DynamicRamping Params...
4 Click OK on the Edit Parameters box. The Save MS Tune File dialog box
Anytime an ATUNE.U is performed it will overwrite the AMU offset which was entered. This
N O T E
is the reason for renaming the tune.
5 Load the PFHT.M and the saved tune file, then save the method.
6 Rerun test mixture (repeat high-mass checkout). If the correction is within
5975T LTM GC/MSD Operation Manual
Control.
a Select AMU offset from the drop down box.
b If the values on the right side are greyed out then select the Enable
Dynamic Ramping For This Lens checkbox.
c Enter in the recommend offset and click OK.
appears.
You can overwrite the existing ATUNE.U to include high-mass adjustment
or save this file to a new name, for example, ATUNEHIGH.U.
5 units, no further adjustments are required.
Operating in Electron Impact (EI) Mode
3
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