Oil resistors provide better stability and temperature coefficients over air resistors and provide the highest precision and stability in resistance measurements.
Our high-accuracy primary standard (model 9331R) air resistors are used for precision resistance calibrations for values from 0.1 Ω to 10 MΩ with drifts up to 2.5 ppm per year drift.
Our high-accuracy working standard air resistors are used for precision resistance calibrations for values from 1 mΩ to 100 MΩ. MI’s 9331’s are small, light, and rugged resistance standards that do not require a temperature-controlled oil or air bath for their specification range.
The 9331G series of high accuracy resistance standards are available in standard values from 10M to 100T Ohms and custom values available at any resistance therein.