| 摘要 |
PURPOSE:To allow a contact resistance to drop, by, when a magnetic excitation current is detected with a detecting means, such as, for instance, a meter, and upon detecting increase of resistance value of the contacting area by the decrease of the magnetic excitation current, temporary release of pressing means, such as, for instance, an air ring, etc. and repressing. CONSTITUTION:When contact resistances of contact areas A under pressure of specimen 1 for inspection and electrodes 3, 3 increase, a magnetic excitation current flowing from a source 6 to the specimen 1 through the electrodes 3, 3 decreases. When this magnetic excitation current is detected with a meter-relay 7 and the magnetic excitation current drops below the specified value, a signal is given to a controller 18 pressure air applied to connecting openings 11, 11 of air cylinder 9 is switched to those 12, 12. The contact area A under pressure of the specimen 1 is released temporarily and thereafter switched again by the controller 18 and the original condition is restored by air pressure applied to the connecting opening 11. By this arrangement, a higher productivity becomes available without necessity of reduction of surplus man-hour values and interruption of continuous operation. |
