Highest precision, temperature and long-term consistency are characteristic features of the described high-precision resistance decade. Many years of experience, tried-and-tested technology and the use of field-proven materials guarantee the high level of precision. The decade resistors consist of low-capacity and low-inductance wire wound of Zeranin. The low temperature coefficient of this material, the low error tolerance of the resistors and the long-term stability achieved through careful artificial ageing are the guarantee for reliable conformity with the technical specifications for this decade resistor. A specially developed precision stepping switch with high-quality contact materials and optimal brush construction guarantee very good reproducibility. The contacts are self-cleaning and virtually free of thermoelectric power. All 6 decade resistor stages are contained in an attractive 19" casing . The casing acts as screen against electrostatic interference. It is conductively connected to the earth socket on the front panel. Electrical connection of the decade resistor to the screen is possible with a connecting link. The two sub-decades R D1 and R D2 are arranged so that they can be operated independently. An insulated plug-in link joins the two sub-decades together to form a six decade resistor. This makes the decade resistors suitable for universal applications. Very low zero-sequence resistance has been achieved by circuit optimization. This very low zero-sequence resistance is divided again if only one decade section is being used.