Precision Reference Resistance, 6 Decade Box – 1 mΩ to 10 MΩ – AOIP ZX Series


The resistance boxes of the ZX series offer high precision and great stability over their 6 decades. They are designed for applications requiring precision and stability both in the development laboratory and in the field for the simulation of resistive sensors.

  • Values: 6 decades between x1 mΩ and x10 MΩ
  • Accuracy: from 0.01%

6 different models are available, for a maximum resistance of 111 111 100 Ω.

The resistive elements are wound inductively using a special alloy resistance wire. Each resistive element undergoes heat treatment and is subjected to a controlled aging process to obtain greater stability and a low temperature coefficient.

The switches used are of the highest quality, with low pressure contacts and low contact resistance ensuring their durability and reliability. Each decade switch is manufactured and housed in a fully enclosed location for maintenance-free operation. These decade boxes are housed in a robust and practical metal case with a retractable carrying handle.

The ZX74 model has the smallest decade, with a step of 1 mΩ. This makes it particularly suitable for the simulation of resistive probes and resistance bridges. All models are equipped with an additional connection terminal connected to the electrostatic screen, necessary for applications on AC bridges. On request, ZX resistance boxes can be supplied with a COFRAC calibration certificate issued by our SOFIMAE laboratory.


Dimensions L x W x H 440 x 130 x 120 mm
Mass 4 kg
Reference area 20 ° C ± 2 ° C (40 to 60% RH non-condensing)
Nominal operating range 5 to 35 ° C (RH: <75% non-condensing


AOIP ZX Resistance standard, 6-decade boxes – 1 mΩ to 10 MΩ-DpstarGroup