Patent ID: 8294759

Claim:
A calibration method of calibrating a relative position of a device image capturer with respect to a socket in an electronic device test apparatus, the electronic device test apparatus comprising: a socket image capturer configured to capture an image of the socket; and the device image capturer configured to capture an image of a device under test, wherein an aligner positions the device under test relative to the socket, and a mover brings the device under test into electrical contact with the socket to test the device under test, the calibration method comprising: placing a jig at a first predetermined position; capturing a first image of the jig placed at the first predetermined position by the socket image capturer; moving the jig placed at the first predetermined position to the aligner by the mover; capturing a second image of the jig positioned at the aligner by the device image capturer; capturing a third image of the socket by the socket image capturer; recognizing a first relative position of the socket image capturer with respect to the first predetermined position based on the first image; recognizing a second relative position of the device image capturer with respect to the first predetermined position based on of the second image; recognizing a third relative position of the socket image capturer with respect to the socket based on the third image; calculating a first offset amount of the first predetermined position with respect to the socket based on the first relative position and the third relative position; and calculating a fourth relative position of the device image capturer with respect to the socket based on the second relative position and the first offset amount.