Installation manual

Operating in Electron Impact (EI) Mode 3
5975 Series MSD Operation Manual 75
To tune the MSD
You can also use the Local Control Panel to run the autotune that is currently
loaded in the PC memory. See “Operating the MSD from the LCP” .
Procedure
1 In the Instrument Control View, verify the correct tune file is loaded. For
most applications, ATUNE.U (Autotune) gives good results. STUNE.U
(Standard Tune) is not recommended as it may reduce sensitivity.
Consider Gain autotune (GAIN.U + HiSense.U). This tunes to a target gain
rather than a target abundance. It offers excellent reproducibility, both of
run-to-run abundance but also between different instruments,
2 Set the system to the same conditions (GC oven temperature and column
flow, and MSD analyzer temperatures) that will be used for data
acquisition.
3 Select Tune MSD to perform a complete tune, or select Quick Tune to adjust
peak width, mass assignment, and abundance, without changing ion ratios.
If your system is configured for CI, you will be able to access the CI Tune
panel from this box. The tune will start immediately.
4 Wait for the tune to complete and to generate the report.
Save your tune reports. To view history of tune results, select
Checkout>View Previous Tunes....
To manually tune your MSD or to perform special autotunes, go to the Tune
and Vacuum Control View.
From this Tune menu, in addition to the tunes available from Instrument
Control, you can select special autotunes for specific spectral results, such as
DFTPP Tune or BFB Tune.
See the manuals or online help provided with your MSD ChemStation software
for additional information about tuning.