Vishay FSR highly accurate resistors

Vishay has released a video that demonstrates the stability of the 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, 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 in before-and-after tests.

Constructed as a direct plug-in device that fits most DMMs, the resistors extend 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 (eg, 9.99962) and a wide resistance range from 1 Ω to 150 kΩ, with any resistance value within this range available at any tolerance.

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 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.