Patent ID: 7956999

Claim:
A test-condition selecting method for selecting a wavelength and an incidence angle of emission light used for testing the resistivity of a transparent conductive film, comprising: emitting p-polarized emission light rays having different test conditions, including wavelengths and incidence angles, to a plurality of transparent conductive films having different combinations of film thicknesses and resistivities so as to measure evaluation values related to amounts of light of reflected light rays thereof; obtaining a correlation in which the test conditions, the evaluation values, and sample conditions are associated with each other, the sample conditions including combinations of the film thicknesses and the resistivities of the transparent conductive films; and selecting one of the test conditions in the correlation, the test condition being such that an error in the corresponding evaluation value due to the different film thicknesses of the transparent conductive films is within a tolerable range and a change in the evaluation value relative to a change in the corresponding resistivity is greater than or equal to a predetermined value.