Abstract: A disclosed CPS relay assembly includes a polymeric housing, a relay switch printed circuit board (PCB) assembly (PCA) within the housing, a thermal substrate or heatsink, and a film of isolation material between the thermal substrate and the relay switch PCA. The isolation material may be a thermally conductive and electrically isolating potting compound. The relay assembly may further include a relay control PCA within the housing. The housing itself may comprise an injection molded plastic, e.g., thermoset or thermoplastic. The housing may include one or more standoff features configured to define a gap of a predetermined dimension between the thermal substrate and the relay switch PCA. The isolation material may exhibit a thermal conductivity of 0.1-3 W/m-K and one or more desirable characteristics for maintaining electrical isolation of the relay assembly.

Abstract: A digital multimeter receives a primary signal including a small amplitude DC component and an induced AC noise component with a magnitude exceeding a magnitude of the DC component. A 100 M? input resistor may couple an primary signal to signal processing circuitry that attenuates and filters the primary signal, convert a unipolar signal to a differential signal, and provide the differential output signal to an analog to digital converter. The multimeter may be configurable to couple any one or more of multiple available feedback paths to provide a plurality of available gain-bandwidth configurations. The multimeter may include a second input configurable with two or more feedback path impedances. The multimeter may include a second stage filter, shared by the primary and shunt inputs, that provides additional filtering and converts the signal to a differential signal. The second stage filter may support two or more available impedance configurations.

Abstract: An alternating current (AC) mitigation system reduces undesired AC current induced in a pipe section by the electromagnet field of a nearby electrical utility power line. An active feedback system processes samples of the undesired AC signal from a current sensor located at the pipe section. A feedback controller generates a current compensation signal that is applied to the pipe section at a current coupler to cancel out the undesired AC signal. Corrosion of the pipe section caused by the undesired AC current may be reduced or eliminated.

Abstract: A method for determining the influence of one of a plurality of cathodic protection circuits along a pipeline includes switching one of a plurality of cathodic protection circuits off, while the remainder of the plurality of cathodic protection circuits are left on, with a portable pipe-to-soil potential measurement unit measuring the pipe-to-soil potential along the pipeline. From these measurements, a calibration curve is generated and an apparatus for monitoring the cathodic protection circuits is strategically positioned on the pipeline. The apparatus includes a remote monitoring unit having a pipe-to-soil potential measurement unit for measuring the potential between the ground bed and pipeline. The remote monitoring unit is off except while making measurements. The remote monitoring unit may optionally include a pipeline current measurement unit connected at a second connection point on the pipeline for measuring the current passing through the pipeline between the first and second connection points.

Abstract: A wheelbarrow contains a tray, a frame, two legs, two handles, two axle brackets, a wheel axle, and a wheel. The wheelbarrow also contains two spaced apart roll bars extending from the frame in a forward and downward direction to a point forward of the forward edge of the tray, then curving upward and extending vertically for a distance of at least about six inches. The upward curve of the roll bar is located below the wheel axle. The upward curve of the roll bar contacts the ground and forms a fulcrum when the wheelbarrow is raised at an angle of not greater than about 40.degree. and so that the wheelbarrow will balance in a vertical resting position on the vertical extensions of the roll bars if the wheelbarrow is released after being raised at an angle of not greater than about 70.degree..