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New VPG Video Highlights Accuracy and Stability of Precision Resistors in Strain Gage Calibration
MALVERN, Pa. — Sept. 24, 2013 — Vishay Precision Group, Inc. (NYSE: VPG) today announced that its Vishay Foil Resistors brand (VFR) has released a new video that demonstrates the shunt calibration of strain gages using Bulk Metal® Foil resistors. Providing long-term accuracy and stability regardless of the operating environment, foil resistors provide a cost-effective and convenient alternative to using certified weight standards for calibration.
Used extensively in structural testing and monitoring applications, strain gages are fundamental sensing devices that function as the building blocks in transducers, including pressure, load, and torque. For calibration, it is especially useful to utilize shunt resistors when the location of the strain gage beam makes it impractical or extremely difficult to periodically check the accuracy of the bridge circuit using a weight standard.
To illustrate how strain gage measurement systems can be calibrated electronically using VFR Bulk Metal Foil precision resistor shunts, the video introduced today employs a demonstration set-up utilizing a half bridge connected to a Micro-Measurements 350 Ω / 350 Ω strain gage beam. To detect any change in resistance when under load, the bridge is deflected by a precisely known amount using a VFR precision resistor in parallel with one side of the strain gage. The amount to be deflected corresponds to the deflection caused by a specific weight standard and is calculated using the well-known parallel resistance formula: “product over the difference.”
VFR Bulk Metal Foil precision resistors are the perfect solution for shunt calibration because they are readily available with non-standard values in any order quantity. With any conceivable ohmic value to six digits available with tight tolerances, a foil resistor of the exact value calculated for the equivalent deflection can be used to accurately detect any changes in the strain gage bridge circuit. Furthermore, VFR foil resistors offer extremely low TCR of less than 1 ppm/ºC with long-term stability of a couple of ppm per year, ensuring very accurate shunt calibration for years to come.
Further information about VFR products is available at www.vishayfoilresistors.com. Follow Vishay Foil Resistors at http://twitter.com/foilresistor.
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.
About VPG Foil Resistors
VPG Foil Resistors, a part of Vishay Precision Group (VPG), produces the most precise and stable resistors available. Distinguished by the premier brands Vishay Foil Resistors, Powertron, and Alpha Electronics, the VPG Foil Resistors portfolio includes 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. These devices are used in applications requiring a high degree of precision and stability, such as in medical testing equipment, semiconductor equipment, precision measuring instruments, aerospace, and military applications. To learn more, visit www.vishayfoilresistors.com.
Bulk Metal is a registered trademark of Vishay Precision Group, Inc.