Agilent Technologies, Inc.

Hewlett-packard Company

James B McKim, Jr

John F Kenny

Buck H Chan

Marko Vulovic

Richard A Carlson

John W Hyde

William H Pickel

Richard S Myers

Robert D Peck

Denis Rehse

Benjamin R Jansyn

Alan W Cudworth

A system for improving dynamic response in a power supply includes a mainframe module having a memory and a mainframe microprocessor, the mainframe processor configured to calculate a plurality of tables in which each table represents a current/voltage (I/V) characteristic curve for the power supply, at least two power supply modules coupled to the mainframe module, each power supply module having a random access memory element, the random access memory element configured to receive and store a first table and a second table, wherein the mainframe microprocessor transfers the first table to each power supply module, and wherein each power supply module executes a respective first table while the mainframe processor calculates the second table for each power supply module and while the mainframe processor transfers the second table to each power supply module.

System and method for improving dynamic response in a power supply

An apparatus and method for synchronous communications using a serial data stream employs a housing with a controller and a back plane. The housing accepts one or more modules for interconnection with the back plane. The back plane distributes power to the modules and provides a communication link from the controller to each module. Each communication link includes a data out line, a data in line and a clock line, where each clock line is derived from one clock source.

Communications system for implementation of synchronous, multichannel, galvanically isolated instrumentation devices

A device which uses a detection circuit to determine whether an output current thereof is source-induced or load-induced, and the method therefor. The device which performs some type of operation based upon the determination as to whether the output current thereof is source-induced or load-induced, and method therefor. The detection circuit determines whether polarities of the output current and an output voltage are the same, and determines the output current to be source-induced if the polarities are the same and load-induced if the polarities are opposite each other. Such a device may have many applications, including use in systems where distinctions between source and load-induced currents are employed in feedback systems to control the system voltage source, systems where the system voltage source is not controlled, but other sources are controlled to influence a summation of voltages and currents at sensing locations, and systems for measurement instrumentation.

Device using a detection circuit to determine whether an output current thereof is source-induced or load-induced, and method therefor

A digital system measures cyclic disturbance signals on an electrical line that are induced by a connected unit under test (UUT). The system includes a digital to analog (D/A) converter which receives and converts a first train of digital signals to a cyclic analog test signal and applies that signal to the electrical line. An analog to digital (A/D) converter receives and converts analog cyclic disturbance signals from the electrical line to a second train of digital signals. A synch generator applies a train of synch pulses, concurrently, to synchronizing inputs of the D/A converter and the A/D converter so that their respective conversion operations are based upon a common time-base signal. A processor is coupled to the D/A converter and A/D converter and outputs the first train of digital signals to the D/A converter and receives the second train of digital signals from the A/D converter. The processor subjects a portion of the second train of digital signals to signal analysis, with the portion of the second train being representative of an integer number of cycles of the cyclic disturbance signal sensed from the electrical line. The clock frequency which causes generation of the synch pulses is selected so that the synch pulses have a precise, predetermined relationship to a predetermined number of cycles of the cyclic signal (in the case of a power spectrum analysis) or a predetermined number of half cycles (in the case of an amplitude analysis).

AC mains test system for measuring current harmonics and voltage

A current shunt for converting a current to a voltage. The current shunt of the invention is made from a conductive material such as a high performance resistance alloy in sheet form which is sheared, punched, and bent to produce a highly stable current shunt with respect to time and temperature. Contact pins of current and potential connections are welded to the material using a fusion welding process, and techniques are also provided for isolating the potential contacts from the current contacts so as to improve stability. Trimming slits of the type used for thin film or foil resistors are also extended to bulk materials in accordance with the invention such that highly accurate resistances may be obtained. An integral heat sink and strain relief mechanism is also provided so as to minimize the adverse effects of temperature on the resistance of the material. The resulting current shunt has an extremely stable resistance value with respect to time and temperature at a minimal cost.

High performance current shunt

Signal currents corresponding to a voltage to be converted into current or to a current to be amplified are applied to one input of an operational amplifier and its other input is referenced to ground. Its output is connected via a power amplifier and a small resistance to an output terminal and means are provided for supplying current proportional to the voltage across the resistance to the signal input of the operational amplifier with such polarity as to tend to cancel the signal current present thereat.

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Blairstown, NJ, United States of America

James B McKim, Jr