The Measurement of Contact Difference in Potential on Certain Oxide-Coated Cathode Diodes

Contact difference in potential for a conventional-type oxide-coated cathode diode is defined in terms of voltage required to establish zero field between the anode and cathode. Contact difference in potential has been found to be relatively unaffected by a wide fange of impurities added to the coating. Tests have shown that the E
ct
measurement is a sensitive technique for observing changes which take place on an initially clean anode.