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New Vishay Foil Resistors Company Demonstration Highlights High Energy Pulse Superiority of Bulk Metal® Foil Resistors as a “Figure Of Merit” for Precision, Stability, and Reliability
MALVERN, PENNSYLVANIA — Dec. 05, 2011 — Vishay Precision Group, Inc. (NYSE: VPG) today announced that its Vishay Foil Resistors division (VFR) has unveiled a new video that presents a demonstration of the high energy pulse capabilities of two resistor technologies: thin film and Bulk Metal® Foil. The short video demonstrates how an 80x rated power electrical pulse vaporizes the thin film device, but is easily absorbed by the Foil resistor.
Using a destructive test that determines how a resistor will perform in a worst-case scenario – such as a lightning strike to an airplane or a power surge – the demo video introduced today highlights the inherent robust design and survivability of VPG Bulk Metal Foil resistors. The test circuit used in this demonstration consists of a high-voltage power supply, a knife switch, two small DMMs, a large 3,000 V capacitor, and 10 kΩ 1206-size resistors in both thin film and the Bulk Metal Foil technologies.  The capacitor is charged to 450 V and then discharged through the resistors, subjecting the resistors to a 20 W pulse for 150 ms, or about 80x their rated power.
As a result of the high energy pulse, the thin film resistor is instantly vaporized. The VPG Bulk Metal Foil resistor, however, not only survives, but shows an insignificant change in resistance.  While not all circuits are subject to such high power pulses, the test provides a clear “figure of merit” indicative of Bulk Metal Foil’s ability to withstand the most severe environmental and application stresses with little or no impact on precision, stability or reliability.  The demonstration shows that, in applications requiring unquestioned reliability and survivability, the VPG Bulk Metal Foil resistor is the device of choice.
The high energy pulse demo is available now on the Vishay Foil Resistors website, at http://www.vishaypg.com/foil-resistors/videos.
Further information about Vishay Foil Resistors products is available at www.vishayfoilresistors.com. Follow Vishay Foil Resistors at http://twitter.com/VPGFoil.
About Vishay Foil Resistors
Vishay Foil Resistors is a division of Vishay Precision Group, producing the most precise and stable resistors available. The portfolio comprises products in a variety of resistor and package configurations to meet the needs of a wide range of applications: discrete resistors and resistor networks in surface mount and through-hole (fixed-lead) configurations; customized chip resistor networks; precision trimming potentiometers; and discrete chips for use in hybrid circuits. The foil resistors and current sensors are used in applications requiring a high degree of precision and stability, such as in medical testing equipment, high performance audio equipment, precision measuring instruments, aerospace, and military applications.
About Vishay Precision Group
Vishay Precision Group (VPG) produces sensors based on precision resistive foil technology, and sensor-based systems. It provides vertically integrated products and solutions for multiple growing markets in the areas of stress, force, weight, pressure and current measurements. As a spin-off from Vishay Intertechnology, VPG’s decades-long track record encompasses innovations in precision foil resistors, current sensors, and strain gages, which have served as a foundation for VPG’s more recent expansion into strain gage instrumentation, load cells and transducers, weighing modules and complete systems for process control and on-board weighing. Vishay Precision Group may be found on the Internet at www.vishaypg.com.