Method for testing surface or spatially extended test object e.g. flat layer used in e.g. battery, involves determining ohmic resistance or impendence values to determine expansion of test object along X,Y and Z directions

摘要

The method involves arranging two pairs of electrodes (E1,E2,E1',E2') at two ends of a selected measurement line of the test object (5) and applying constant current to two pair of electrodes by a constant current source. The voltage between electrodes is determined by a voltage measurement device. The ohmic resistance values or impendence values are determined from measured voltage by an evaluation device so as to determine the expansion of test object along X,Y and Z directions. An independent claim is included for tester for testing surface or spatially extended test objects by Kelvin method.