Abstract: A positioner facilitates docking and undocking of an electronic test head with a device handler. The positioner provides for rotation of the test head about a first axis. The positioner includes a support structure for moving the test head along a second axis orthogonal to the first axis. The support structure accurately docks the electronic test head with the device handler.

Abstract: A positioner facilitates docking and undocking of an electronic test head with a device handler. The positioner provides for rotation of the test head about a first axis. The positioner includes a support structure for moving the test head along a second axis orthogonal to the first axis. The support structure accurately docks the electronic test head with the device handler.

Abstract: A positioner facilitates docking and undocking of an electronic test head with a device handler. The positioner provides for rotation of the test head about a first axis. The positioner includes a linkage arm structure for moving the test head along a second axis orthogonal to the first axis. Using motors, sensors and a processor, the linkage arm structure accurately docks the electronic test head with the device handler.

Abstract: A positioner facilitates docking and undocking of an electronic test head with a device handler. The positioner provides for rotation of the test head about a first axis. The positioner includes a linkage arm structure for moving the test head along a second axis orthogonal to the first axis. Using motors, sensors and a processor, the linkage arm structure accurately docks the electronic test head with the device handler.

Abstract: A method and apparatus for measuring the electrical conductivity of a liquid comprises an electrically insulating housing through which the liquid flows, and four electrodes inserted into the path of the liquid flowing through the housing. The first and third electrodes are current electrodes and the second and fourth electrodes are voltage electrodes. An AC current is injected into the first current electrode and exits at the second current electrode, with the resulting AC voltage across the voltage electrodes being measured. The first current electrode is driven to maintain a constant value of AC voltage on the voltage electrodes while measuring the current flow in the second current electrode which is representative of the electrical conductivity of the liquid. A DC bias voltage source is provided and is coupled to each of the electrodes by a resistor and a capacitor to prevent coating or plating of the electrodes.

Abstract: A device for the collection of Raman scattered light by means of an internally reflective sphere 10 wherein a light source 12 provides light to and through a sample 16, which light is reflected back through that sample by the internally reflective sphere 10. The sample is viewed by means of a spectrograph 30 focused by lenses 26, 28 or a fiberoptic light pipe 46.

Abstract: A solid state protective device is disclosed which monitors an electric quantity such as current or its negative phase sequence component in a protected circuit and which responds to abnormal increases in the value of that quantity by activating a circuit breaker or warning device after a period of time which is a non-linear inverse function of the magnitude of the circuit quantity being monitored. The device includes a non-linear function generator, using novel arrangements of operational amplifiers, to approximate the non-linear operating characteristics which are desired and in one form includes an automatic range changing feature to increase the operating range of the device.

Abstract: A solid state protective device is disclosed which protects electrical apparatus from heat damage due to overcurrents, particularly one which protects electrical generators from damage caused by heat due to excessive negative phase sequence currents. The device includes a novel reset feature such that the time required for the device to take protective action after an overcurrent is detected is reduced by a period of time which is a linear function of the heat remaining in the protected apparatus due to any prior overcurrents.