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MALVERN, PENNSYLVANIA — April 18, 2012 — 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 cryogenic capabilities of Bulk Metal® Foil resistors. The short video demonstrates how a precision foil resistor exhibits low TCR with no discontinuities through temperature excursions down to −196ºC.
Cryogenic applications require resistors with a structural integrity capable of withstanding extreme temperature cycling without damage or detriment to performance. In addition, the different expansion and contraction rates of composite materials in resistors may induce discontinuities during temperature excursions that are not evident at temperature extremes, making an unreliable resistor appear normal. A resistor used in cryogenic applications must also return to its initial value with no resistance drift.
In the video demonstration introduced today, a 10 kΩ VSMP0805 precision foil resistor is taken from a room temperature of +25ºC and immersed in a flask of liquid nitrogen with a temperature of −196ºC. The resistor is stabilized at −196⁰C, then removed from the flask and allowed to return to its original 25⁰C temperature.
Continuous monitoring during the test shows that the resistor not only survived its excursion to −196°C but exhibited a TCR of only -5 ppm/⁰C, experienced no discontinuities, and returned to its same starting resistance value once again at room temperature.
In addition to an extensive line of standard products, VFR designs and produces unique customer-oriented products using its Z-Foil technology. Special chip stabilization protocols, including extreme environmental conditions, are added to the production line, and specially developed stress protocols are included in post-manufacturing operations (PMO) to achieve even higher degrees of stability and reliability for extraordinary high/low temperature applications.
When similar stress extremes are applied to thick film or thin film resistors, particulate shifts in thick film and in sputtered thin film elements, or crystal deformation in evaporated/ deposited thin film elements, result in permanent changes in resistance and a reduction in the device’s overall stability. In applications likely to experience cycling through, or extended dwell time at, extreme high or low temperatures, and where stability is the main concern, Bulk Metal Foil and Z-Foil technology assure the best performance and reliability.
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) is an internationally recognized designer, manufacturer and marketer of: components based on its resistive foil technology; sensors; and sensor-based systems specializing in the growing markets of stress, force, weight, pressure, and current measurements. VPG is a market leader of Foil Technology Products, providing ongoing technology innovations in precision foil resistors and foil strain gages, which are the foundation of the Company’s Force Sensors Products and its Weighing and Control Systems. The product portfolio consists of a variety of well-established brand names recognized for precision and quality in the marketplace. To learn more, visit VPG at www.vishaypg.com