Vishay has introduced secondary standard resistors for laboratory calibration and digital multimeters.
"For test equipment designers, the resistors offer accuracy of 10ppm at the terminals, long-term stability of +/-5ppm at 25°C for one year, temperature coefficient to +/-0.3ppm/°C from 15°C to 45°C, and resistance tolerance to +/-50ppm," claimed the firm.
Maximum temperature coefficient is 10-30ppm total deviation over temperature range.
With its four male banana pins, the package is designed to plug straight into the front panels of many multimeters.
Inside are low inductance (<0.08μH) resistors made with the firm's 'bulk metal foil' technology.
"The device 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," said Vishay. "In addition, it extends the usefulness range 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."
The device is available with up to six significant digits (9.99962, for example) at any resistance between 1Ω and 150kΩ.
The package is RF-shielded, the resistive element is hermetically sealed, and they come with a certificate of accuracy traceable to US standards body NIST.
Rise time is 1.0ns "with effectively no ringing", said Vishay and thermal stabilisation time is under a second to within 10ppm of steady state value.
Current noise is 0.010µVrms/V(<-40 dB), voltage coefficient is under 0.1ppm/V and there is 25kV electrostatic discharge tolerance without degradation.