IsoPrime User’s Guide
Version 1.01 IsoPrime100 User’s Guide Page 99 of 219
This new method can now be incorporated into any sample list. An example sample list is as
shown below:
After Sample 4 the peak centre analysis will start. Once complete the tune file will be updated
and saved to the new peak centre result. The sample list will then continue with further analysis.
HEAD AMPLIFIER ZEROES
THE FUNCTION OF ZEROES
The amp zeroes have two major functions:
To adjust the displayed beams and ratios for the electronic and collector offsets.
To correct dual inlet data for the offsets.
If the electronic offset is removed from a displayed beam, then the beam is representative of
the ion beam that is being measured. If there is no sample in the source, or if the reference gas
is turned off, the beam that is displayed is the ion background. If the reference gas is then
turned on, the observed beam is the ion background plus the beam from the reference gas.
If the collector zero is removed, both the electronic offset and the ion background are removed.
As a result, a zero beam is observed. If the reference gas is then added, the observed beam
reflects the reference gas only.
Note that both types of zeroes are only subtracted from the displayed values. The data that are
stored in the data file are the raw data from the head amplifier and do not have either type of
zero subtracted.
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