FOERFARANDE OCH SYSTEM FOER STANDARDISERING AV YTVIKTSMAETARE.

摘要

A system and method are disclosed for standardization a basis weight gauge for measuring the weight per unit area of sheet material. The method includes the calibration steps of obtaining two calibration curves, one of which is displaced from the other by a dirt simulation technique. The displacement between the two curves is expressed as a third curve. A standard sample of a pre-determined basis weight is inserted in the radiation path to provide a standard shft in conjunction with the dirt simulation to provide a reference value for the displacement function curve. During operation of the basis weight gauge, standardization is provided by relating a current standard shift to the initial standard shift to correct the displacement function curve, based upon the value of the third curve at a point corresponding to a measured transmission ratio.