FOUR-ELECTRODE PROBE FOR MEASURING RESISTIVITY

摘要

PURPOSE:To accurately measure resistivity, by forming the leading ends of two current applying electrodes outside a measuring four-electrode probe into circular contact surfaces and constituting said contact surfaces of a circular conductive rubbery substance. CONSTITUTION:A current applying electrode 1, voltage measuring electrodes 2, 2 and a current applying electrode 1 are successively brought into contact with the surface 7-1 of an article 7 to be measured in this order in a line. The leading ends of the current applying electrodes 1, 1 have an area and a current can be allowed to flow from the entire surfaces of the contact surfaces 7-1 thereof. Since a current is not concentrated to one point but distributed to the entire surfaces of the electrodes 1, 1, it is avoided that current density becomes high. Further, since a current is not concentrated, the material of the current applying electrodes 1, 1 is not limited to a specific substance and, for example, material quality having flexibility such as conductive rubber can be selected in order to form the leading end of each electrode. By this method, this probe is brought into close contact with the surface of the article to be measured having small unevenness to easily allow a current to uniformly flow.