Patent ID: 7859286

Claim:
An electronic device test system using M number (M is a natural number of 1 or more) of contact arms to hold N number of DUTs of a predetermined lot of a plurality of DUTs, simultaneously bringing these N number of DUTs into contact with N number of contact parts to which test patterns are input, classifying and ejecting said DUTs based on the response patterns, and repeating this until said predetermined lot ends, said electronic device test system having a loader buffer for temporarily carrying N number of DUTs to be held by said contact arms, a first detector for detecting the number and positions of the DUTs carried on said loader buffer, and a controller for issuing a command for making another DUT be held at a position of a contact arm corresponding to a missing position of a DUT detected by said first detector when said first detector judges that the number of the DUTs carried on said loader buffer is less than N.