NOTE: Retention time used for performance tests

Peak Performance can be calculated for any integrated peak of the data loaded, and also for new manually integrated peaks. The application calculates peak characteristics and column performance values using a peak model retention time which is calculated internally. It may differ slightly from the retention time shown in the injection results, chromatograms, or reports. The peak model retention time can be reported (see Data fields used for system suitability in the Reporting help, or search for PeakModelRT ).

Please note that the retention time (RT) depicted in the figure below and determined by the peak integrator is not necessarily associated with the highest data point. The retention time is usually calculated using an parabolic interpolation model. This means that the retention time RT can potentially be smaller or larger than the retention time of the highest data point and the height might also be higher or lower than the highest data point. The peak model retention time is calculated by smoothing the signal to avoid interference of noise. After this the highest data point closest to the RT of the peak is determined. The RT of this data point is used as the peak model retention time.

where
RT	Retention time shown in the injection results
A	Peak model retention time used for performance calculations