The noise calculations are identical for ¹D and ²D peaks, and the same noise range options are available in the processing method: Automatic, Fixed from, and Relative from.
NOTE
The noise time range specification applies to both, ¹D chromatograms and ²D cut chromatograms. Therefore, if you chose a fixed time range, make sure that this time range exists in both the (long) ¹D chromatograms as well as in the (short) ²D cut chromatograms.
As for 1D data, the noise must be calculated in the last blank run (sample type Blank) acquired before the injection. However, using the noise range on a blank works different. For a ²D peak in a ²D cut chromatogram, the noise must be retrieved from the matching ²D cut chromatogram in the blank run. Matching ²D cut chromatograms means that:
the cuts originate from the same ²D signal
the cuts have the same begin time and end time in their ¹D signals (± 0.01 min, which is the time accuracy in the drivers acquisition method)
All ²D cut chromatograms from the sample run must have matching cuts in the blank run. The noise is then calculated the same way as for peaks in a 1D chromatogram.
The results are shown in the S/N and Noise columns of the Peak Table ²D window.
base-id: 10237518091
id: 10237518091