A method and apparatus are provided for capturing voltage phase angle data on an alternating current power grid. The method includes periodically making a voltage phase angle measurement at each of a plurality of locations on the alternating current power grid relative to a timing reference signal (e.g., a GPS timing signal) that is available at each location. For each of the locations, the voltage phase angle measurements are stored locally at the location. A trigger event is selected that will be simultaneously detectable at two or more of the locations. The method includes monitoring for the trigger event at each of the plurality of locations. In response to detecting the trigger event at one or more of the locations, a select amount of pre-trigger and post-trigger measurements are transmitted over a data communications network to a pre-designated destination from each location at which the trigger event was detected.

A method and apparatus are provided for capturing voltage phase angle data on an alternating current power grid. The method includes periodically making a voltage phase angle measurement at each of a plurality of locations on the alternating current power grid relative to a timing reference signal (e.g., a GPS timing signal) that is available at each location. For each of the locations, the voltage phase angle measurements are stored locally at the location. A trigger event is selected that will be simultaneously detectable at two or more of the locations. The method includes monitoring for the trigger event at each of the plurality of locations. In response to detecting the trigger event at one or more of the locations, a select amount of pre-trigger and post-trigger measurements are transmitted over a data communications network to a pre-designated destination from each location at which the trigger event was detected.

A device for attaching a sensor to a lug has an inert resilient plastic frame which encircles the top surface of a lug and is held in place by snaps which engage the cable bore of the lug. A resilient retainer for holding a sensor extends from the frame.

A voltage sensing system includes a sensing system housing, a circuit board positioned with the sensing system housing, and a phase conductor extending through the sensing system housing, the phase conductor to carry a load current. The system also includes a voltage sensor contact, the voltage sensor contact including a first end and a second end, the first end being electrically coupled to the circuit board and the second end being electrically coupled to the phase conductor.

A coolant supplying apparatus, which is configured to prevent dew condensation from being generated in a supply of coolant, and a temperature controlling apparatus and a test handler including the same are provided. The coolant supplying apparatus includes a housing having an outlet, a coolant spraying part arranged inside the housing and configured to discharge coolant around the outlet of the housing, and a dry air injection part configured to inject dry air into the housing.

A device includes a sensor surface and a pair of electrodes. The sensor surface includes a first conductive layer separated from a second conductive layer by an intermediary layer, a magnetization direction of the first conductive layer and a magnetization direction of the second conductive layer having a ground state orientation of approximately 0 degrees. An electrical resistance between the pair of electrodes is determined by a magnetic field proximate the sensor surface.

A test system measures parameters of a device under test (DUT), including a transistor. The test system includes a first voltage source unit for supplying a gate voltage; a second voltage source unit for supplying one of a drain voltage or a source voltage, the second voltage source having a current measurement device for detecting one of a drain current or a source current flowing through the transistor, respectively; a feedback unit for outputting a feedback current, based on the one of the drain or source currents; and an error amplifier for outputting a feedback control signal, based on comparison of the feedback current and a target current value. The first voltage source unit adjusts the gate voltage based on the feedback control signal so that the one of the drain or source currents converges to match the target current value.