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New Vishay Foil Resistors Video Demo Highlights Secondary Standard Resistor With 10 ppm Accuracy

14th September 2011

Vishay

ES Admin

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Vishay Precision Group have unveiled a new video that gives a dramatic demonstration of the stability of the new FSR secondary standard resistor for laboratory calibration standards and digital multimeters. Using an 8.5-digit ohmmeter, the demo shows the ability of an FSR device, built on Bulk Metal Foil® technology, to withstand rough handling with no change whatsoever in its resistance value. Even after being dropped on the floor, buried in potting soil, and doused with water, the device shows the same ohmic value out to the fifth decimal place through before-and-after tests.

Constructed as a direct plug-in device that fits most DMMs, the Vishay Foil Resistors FSR delivers new benchmark capabilities for accuracy, stability, and speed. Compared with the inductive resistors featured in most secondary standard boxes, the FSR extends the frequency range by up to 10 times with reliable accuracy at the box terminals.

The FSR is produced with infinite resolution for any required resistance value, not just typical standard values. 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. Manufacturers are thus able to improve the accuracy of their own products by direct reference to the exact value resistance standard needed to calibrate their products and equipment. For increased reliability, the FSR features an RF-shielded case, while its hermetically sealed resistive element eliminates the effects of humidity.

For test equipment designers, the new FSR maintains a 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 total deviation over temperature range, 30 ppm for low values), and resistance tolerance to ±0.005% (50 ppm). The FSR is supplied within 0.005% of any desired resistance value, and each unit is marked with the exact measured resistance value within 10 ppm accuracy relative to certified primary resistance standards.

The FSR can be used as a substitution component for RTD, bridges, attenuators, voltage dividers, , adjustable feedback resistors for use with operational amplifiers, and network ladder elements. In addition, the FSR greatly extends the usefulness range for these instruments due to its high-frequency performance, making it ideal for use in inspection stations, in the standards laboratory, and for component evaluation.