This topic describes how to create custom calculations in the Summary Table using User Columns.
Note that majority of calculations require chromatogram to be calibrated. Without it the necessary values are not available.
Caution:
User Columns are stored in .dsk files. If the station is used by multiple users it is recommended to set shared .dsk file as described in chapter "Sharing settings among users".
How to add User Columns to Summary Table
The main difference between Result Table and Summary Table is the information represented in columns. In the Result Table, calculations are performed for multiple compounds (peaks) within a single chromatogram, while in the Summary Table the same calculation is performed for one compound across multiple opened chromatograms.
Because of this, a User Column in the Summary Table may not display the same values as an identical formula in the Result Table.
Below are the steps to set up User Columns in Summary Table:
- In the Chromatogram window, switch to Summary tab.
- Right click on the Summary Table and select User Columns - Add..., the Add User Column dialog will be opened.
- Here you can fill in the appropriate Name, Expression and Units of the User Column. Unlike in Result Table, you can not check Calculate Total and select individual compounds from Special values when adding User Columns to Summary table.
- Click OK in the Add User Column dialog.
- New User Column is added to the Result Table.