Understanding Your Agilent ChemStation 181
Automation
8
Specifying Recalibrations
The table shows the columns in the sequence table that contain the
recalibration parameters and the values that can be entered.
No Update
Does not change the response factor or retention/migration time.
Replace
Replaces the previous retention/migration times and the response (areas or
heights) with those from the current run only. The response is not changed for
any peak that is not found in this recalibration run.
Average
Averages the retention/migration times and responses (areas or heights) for
each peak based on the original calibration run and all averaged recalibrations
since then. If a peak is missing in one of the recalibrations, the average
response of the peak will not suffer.
Bracket
The samples are bracketed by pre-sample and post-sample calibrations.
Evaluation is done when the last calibration sample of the closing bracket has
been run. The existing calibration data is replaced by the result data of the
calibration run of the opening bracket. The closing bracket calibrations are
averaged to that calibration table.
Interval
The Interval determines how often a calibration is done during a sequence.
Calibration frequency corresponds to the number of sample injections that are
done before the next set of calibration injections takes place. At the start of
the analysis, a calibration is done and the results (response factors) are
entered into the calibration table. These results are then used in subsequent
quantitative calculations. After the specified number of injections have been
done, another calibration is made and the results are entered into the
calibration table overwriting the results of the previous calibration run.
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