Narrow Calibration

Narrow calibration can be used if narrow molecular weight distribution standards (polydispersity < 1.2) are available for given polymer. Calibration curve is constructed from detected peak maximum retention times and known Mp values. Alternatively, (Mw.Mn)^1/2 values can be used, if Mp values are not declared.

GPC Calibration (Narrow)

After selecting the calibration type, a standard chromatogram can be opened. The Add All Narrow Peaks icon will transfer all integrated peaks data to the Calibration Summary Table, setting a new standard number for each standard chromatogram opened and creating a new line for each peak in the standard. The Add Narrow Peak icon will perform this operation peak by peak.

For multi-signal standards the Set RT To All Narrow Peaks icon is used for transferring the RT on subsequent signals to calibration for peaks where RT is not used. Operation is performed only for peaks with Std. No. value equal to current Std. No. indicated on the Window toolbar of the Calibration window. This command can also be used for recalibration by selected standard. In this case RT of standard peak must match Std. No. values as described and also match Recalibration Search Window of peak being recalibrated (for more details see also chapter GPC Calibration Options). The Set RT To Narrow Peak icon performs this operation peak by peak.