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Breakthrough Device Offers High Accuracy to 10 ppm, Long-Term Stability of ±0.0005%, and TCR to ±0.3 ppm/°C from +15°C to +45°C
MALVERN, PENNSYLVANIA — Aug. 17, 2011 — Vishay Precision Group, Inc. (NYSE: VPG) today announced that its Vishay Foil Resistors division (VFR) has introduced a breakthrough secondary standard resistor for laboratory calibration standards and digital multimeters (DMM). For test equipment designers, the new FSR offers exceptionally high accuracy of 10 ppm at the terminals, long term stability of ±0.0005 % (5 ppm) at +25 °C for one year, temperature coefficient of resistance (TCR) to ±0.3 ppm/°C from +15 °C to +45 °C (Max TCR: 10 ppm to 30 ppm total deviation over temperature range), and resistance tolerance to ±0.005 % (50 ppm).
Offering a direct plug-in device for most DMMs, the FSR is based on a new design utilizing Bulk Metal® Foil technology, resulting in a combination of standard features with new benchmark capabilities for accuracy, stability, and speed. By using VFR precision resistors instead of the inductive resistors featured in most secondary standard boxes, the FSR allows for controllable accuracy at the box terminals through calibration, while extending the frequency range up to 10 times.
The device released today is intended for adjustable, direct reading resistance and serves as a substitution component for RTD, bridges, attenuators, voltage dividers, multipliers, adjustable feedback resistors for use with operational amplifiers, and network ladder elements. In addition, the FSR greatly extends the range of usefulness for these instruments due to its high-frequency performance, making them ideal for use in inspection stations, in the standards laboratory, and for component evaluation.
“Virtually all available conventional and specialized secondary standard resistors present a number of problems, including instrument accuracy; resistance shifts caused by load, temperature, or environmental changes; difficulty in measurement of the last digits; limitations on usable frequency; size; and ease of setting,” said Yuval Hernik, senior director of application engineering for Vishay Foil Resistors. “After an intensive analysis of these issues, we have developed a completely new design. With the unequalled combination of the Bulk Metal Foil resistors’ performance parameters, the FSR offers a level of accuracy, stability, and versatility never before combined in one secondary standard resistor, eliminating or reducing these problems to insignificance.”
The FSR offers virtually infinite resolution in resistance setting and readability. The device is available with up to six significant digits (e.g. 9.99962), and a wide resistance range from 1 Ω to 150 kΩ, with any resistance value within this range available at any tolerance with no additional cost or lead time effect. For increased reliability, the resistor standard features an RF shielded case, while its hermetically sealed resistive element eliminates the effects of humidity. The FSR offers a small size and robust, four-terminal construction with an additional banana socket for external ground, and is supplied with a certificate of accuracy traceable to NIST.
The resistor standard features a rise time of 1.0 ns, with effectively no ringing, a thermal stabilization time of <1 s (nominal value achieved within 10 ppm of steady state value), current noise of 0.010 µVrms per volt of applied voltage (<-40 dB), and a voltage coefficient of <0.1 ppm/V. The device offers a non-inductive (<0.08 μH), non-capacitive design, and is capable of withstanding electrostatic discharges at least to 25 kV without degradation.
Production quantities of the FSR are available now, with lead times of 3 weeks.
About Vishay Foil Resistors
Vishay Foil Resistors is a division of Vishay Precision Group, producing the most precise and stable type of resistors available. The portfolio comprises products in a variety of resistor configurations and package types to meet the needs of a wide range of applications: discrete resistors and resistor networks in surface mount and through-hole (leaded) 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 and 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 foil precision 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