9331 Standard AC/DC Air Resistor

The Measurements International 9331 series of Precision Standard Air Resistors provide high accuracy and stability, for precision, on-site, resistance calibrations for values from 10 μΩ to 100 MΩ. The small, light and rugged resistance standards are ideal for use as working standards and are often used as artifacts in inter-laboratory comparisons.

Stability and temperature coefficients of the 9331 make this resistor ideal for easy transport and operation in any working environment within the range of 18 °C to 28 °C. The resistance standards require no temperature-controlled oil or air baths to achieve their specifications. However, for optimal performance as a primary set of resistors, it is recommended that the resistors be placed in Measurements International’s model 9300A Air Bath.

Connections to Model 9331 are made using tellurium copper binding posts for values up to 100 MΩ.

A separate ground terminal is included for screening and the case is hermetically sealed to keep moisture out.

An interconnecting cable may also be ordered with the 9331 Resistance Standards. The interconnecting wire comes in either two- or four-conductor configurations. The wire may be ordered in lengths with screens already attached or in 100-metre rolls. No. 18 gauge solid copper, silver-plated, screened Teflon cable is recommended. Four-conductor cable is recommended to 1 MΩ and two-conductor cable for values above 1 MΩ.

Special values are also available at customer request.

^{* Tolerance – Defined as the potential variance at 23 °C from the nominal resistance value at the time of manufacture. Due to the natural ageing process, it is recommended that the resistance value be monitored closely for the first year of ownership.}

^{** AC performance up to 10 kΩ and up to 1 k Hz}