MI 9210A, MI type 1 ohm standard

The MI 9210A MI-Type standard was developed by Measurements Instruments after years of research by the NRCC and MI. This model is now offered as an improved resistance design to replace the L&N Thomas-Type One-Ohm standard, as well as other values.

These improvements have been achieved through a new annealing process of the element and changes in structural assembly.

Historical data now shows that the MI 9210A is the most stable oil-filled resistor commercially available. The 9210A model has a long term drift of less than 0.2 ppm per year and a temperature coefficient of less than 0.05 ppm / °C.

Model Specifications

Model Nominal Tolerance First Year Stability Max TC at Maximum
Value ± ppm Drift (ppm) 12 Month Current (A) 25 °C ± 1 °C Voltage
Ohms (ppm) (ppm/°C)
9210A/0.1 0.1 < 10 ppm 1 0.2 1 0.05 0.1
9210A/1 1 < 10 ppm 1 0.2 0.1 0.05 0.1


In every country there is only one institute that uses these kinds of standards. In the other cases a set of precision resistors is used which cover the different decades.

For more information about electrical standards, please refer to the overview page. Or contact one of our consultants.

Open the datasheet for detailed specifications of this product.

Open datasheet Quotation request