Electrical/Electronics

External Power Supply Efficiency Regulation Introduction

Presently Energy Efficiency Level V is mandatory in Canada and throughout Europe. In February 2016 Energy Efficiency Level VI will become mandatory in the United States. Attached are the details of the pending change, but in brief, both the standby power draw and efficiency of the operating power supplies must meet minimum levels set in the standard. MEGA is in the process of updating our product line to comply with the coming changes.

Posted in: White Papers, Electronics

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An Operationally Based Vision Assessment Simulator for Domes

Applications include remote visualization, flight simulation, virtual environments, and planetariums. Ames Research Center, Moffett Field, California The work described here is part of the U.S. Air Force-sponsored Operational Based Vision Assessment (OBVA) program that has been tasked with developing a high-fidelity flight simulation laboratory to determine the relationship between human vision and performance in simulated operationally relevant tasks. The OBVA simulator was designed and built to provide the Air Force School of Aerospace Medicine (USAFSAM) with a scientific testing laboratory to study human vision and testing standards.

Posted in: Briefs, Computers, Simulation Software

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Reducing Power-On/Off Glitches in Precision DACs

Voltage glitches are common in a signal chain path, especially when the system is being powered up or down. Depending on the peak amplitude and glitch duration, the end result in the system output can be catastrophic. One example is an industrial motor control system where a digital-to-analog converter (DAC) drives the motor drivers to control motor spin. If the glitch amplitude is higher than the motor driver’s sensitivity threshold, the motor could be spinning without control in any direction when the system is powered up/down.

Posted in: Briefs, Power Management, Motors & Drives

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How to Choose the Appropriate Rack Size for a Chassis System

To stay competitive you need to balance a system’s current needs while keeping in mind future expansions. Selecting the appropriate rack size for your chassis system is critical for your success.

Posted in: White Papers

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Self-Diagnostic Accelerometer Field Programmable Gate Array

The system could be utilized as a portable and temporarily installed diagnostic system. John H. Glenn Research Center, Cleveland, Ohio The development of the self-diagnostic accelerometer (SDA) is important to both reducing the in-flight shutdowns (IFSD) rate — and hence reducing the rate at which this component failure type can put an aircraft in jeopardy — and also as a critical enabling technology for future automated malfunction diagnostic systems. Critical sensors, such as engine sensors, are inaccessible to the operator during typical operation due to safety concerns and enclosed environment. The SDA can diagnose the sensor in-flight and remotely with minimal interference with the typical operation of the sensor. The SDA system utilizes programmed health algorithms that can automatically determine the health, therefore increasing the precision in diagnosing sensor faults by removing the erroneous perspective and opinions of a human operator. The health of the sensor could also be determined immediately, which would remove its erroneous effect on a system that depends on the sensor.

Posted in: Briefs, TSP, Power Supplies, Thermal Management, Sensors

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Capacitively Coupled, High-Voltage Current Sensing for Extreme Environments

NASA’s Jet Propulsion Laboratory, Pasadena, California Wide-temperature and extreme-environment electronics are crucial to future missions. These missions will not have the weight and power budget for heavy harnesses and large, inefficient warm boxes. In addition, extreme-environment electronics, by their inherent nature, allow operation next to sensors in the ambient environment, reducing noise and improving precision over the warm-box-based systems employed today.

Posted in: Briefs, TSP, Electronic Components, Power Supplies, Thermal Management, Sensors

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E-Textile Interconnect

Devices constructed from e-textiles have applications in law enforcement, by first-responders, and in wireless communications and computing. Lyndon B. Johnson Space Center, Houston, Texas E-textiles have shown great promise within the microwave and antenna community to provide a low-mass, highly conformal option that integrates extremely well with fabric-based microwave devices and antenna platforms, but often not as well with more conventional devices.

Posted in: Briefs, TSP, Antennas

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