Patent ID: 8591728

Claim:
An electronic device test apparatus comprising: a filter unit; a tank in which an insulating fluid is stored; a water jacket which covers a testing device mounted on a board; a supply side pipe which connects the tank and the water jacket; a return side pipe which connects the water jacket and the tank; a pump configured to circulate the insulating fluid through the tank, the supply side pipe, the water jacket, and the return side pipe; and a judging device configured to judge that a conductive fluid is mixed into the insulating fluid when the conductive members are conductively connected, wherein the filter unit comprises two or more conductive members made of a conductive material and enabling passage of the insulating fluid and the conductive fluid, the two or more conductive members are provided inside the tank so that the insulating fluid heading toward an outlet of the tank can pass through the two or more conductive members, the two or more conductive members include first conductive members and second conductive members extending along the height direction, the first conductive members and the second conductive members are arranged alternately along the circumferential direction, and the judging device stops the pump when detecting the inclusion of the conductive fluid into the insulating fluid.