Abstract: A contactor assembly including two pairs of electrical contactor carrying heads respectively disposed on opposite sides of a track for transporting packaged electronic devices having laterally extending connector legs or pads. One of the heads of each pair includes a stop projection. Electrical actuators and associated mechanical linkages are provided for sequentially moving the heads of each pair toward each other in steps from maximally separated positions to intermediately separated positions wherein the stop projections intrude into the path taken by devices moving along the track and thereby define a device test location, and then to minimally separated positions wherein the contactors of each head engage the connector legs or pads of a packaged device disposed in the test location.

Abstract: A lensmeter is disclosed for determining the refractive properties of a test lens, including an optical system to produce an ellipse of light at a detecting plane having information of such properties, a scanning linear photodiode array at the detecting plane for producing video output signals, a first integrator to integrate the video output signal from each photodiode, a compensator to compensate each video output signal for the light sensitivity of each photodiode, a second integrator to integrate the compensated video signals over the range of the distribution of light of an area of the ellipse being scanned, a circuit, connected to the second integrator, to detect the median point of the distribution, and a microprocessor to provide data identifying the median point in response to the detection.