9331 Series

Series of Four Terminal Air Resistors from 1 μΩ to 100 MΩ with Optional Carrying Case

  • ISO 17025 Calibrations Available
  • High Stability
  • 1 μΩ to 100 MΩ
  • Operating Range 18 °C to 28 °C
  • Custom Values Available
  • Low Temperature Coefficient
  • Stability Better Than 2.5 ppm/Year
  • No Air or Oil Bath Required
Features & Benefits

The Measurements International 9331 series of Precision Standard Air Resistors provide high accuracy and stability, for precision, on-site, resistance calibrations for values from 1 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 for operation in any working environment within the range of 18 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 the Measurements International’s model 9300A Air Bath.

Connections to the model 9331 are made using tellurium copper binding posts for values to 100 MΩ.

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

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 also available at customer request.

Specifications
Model Nominal Value
in Ω
Tolerance
± ppm*
Stability
ppm/year
Max
Current (A)
TC 23 °C ± 5 °C
± ppm/°C
Max
Voltage (V)
9331/0.001 0.001 10 15 6 1.5 0.006
9331/0.01 0.01 5 10 3 0.5 0.03
9331/0.1 0.1 4 4 1 0.3 0.1
9331/1 1 2 2.5 0.3162 0.4 0.32
9331/10 10 2 2.5 0.1 0.4 1.0
9331/25 25 2 2.5 0.0632 0.4 1.58
9331/100 100 2 2.5 0.0316 0.4 3.16
9331/200 200 2 2.5 0.0224 0.4 4.47
9331/300 300 2 2.5 0.0183 0.4 5.48
9331/400 400 2 2.5 0.0158 0.4 6.32
9331/1 k 1 k 2 2.5 0.01 0.4 10.00
9331/10 k 10 k 2 2.5 0.0032 0.4 31.62
9331/12.9 k 12.9 k 2 2.5 0.0028 0.4 35.92
9331/100 k 100 k 2 2.5 0.001 0.4 100.0
9331/1 M 1 M 2 2.5 0.0003 0.4 316.2
9331/10 M 10 M 5 10 0.0001 5 1000
9331/100 M 100 M 10 25 0.00001 5 1000

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

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