Reference dividers are used for comparative measurements while calibrating measuring systems.

Reference dividers, type RCZ, are designed for the calibration of voltage dividers for AC, DC, full- and tail-chopped impulse voltages. They can be used for normal measurements as well.

Reference dividers, type R, are designed for the calibration of voltage dividers for full and front-chopped lightning impulse voltages. R dividers can be used for normal measurements too.

Reference dividers meet all requirements of IEC 60060-2, in particular those with respect to measuring accuracy and step response.

The active part of the high voltage unit of dividers type RCZ consists of one oil-filled capacitor assembly that is housed in a cylinder made of glass fibre reinforced epoxy resin. A series damping resistor is inserted between the capacitor elements of the unit and acts as a distributed internal resistive element. A further resistor is arranged in parallel with these RC elements.
The active part of the high-voltage unit in the R 500 REF forms a low-inductance resistor consisting of CrNi wire wound on a core that is also housed in a glass fibre reinforced epoxy resin cylinder.

The RCZ 500 operates corona-free in its basic version and the reference dividers type R and RCZ 800 are equipped with a specific HV electrode to guarantee corona-free operation.

The secondary unit of the R dividers consists of measuring resistors with low inductance mounted in a coaxial design inside a cylindrical housing. For the divider type RCZ additional capacitors are combined with the resistors in a similar arrangement. The secondary unit is fixed at the bottom of the divider and can be easily exchanged.

The reference dividers are erected on a four-arm base equipped with castors. They are designed for indoor operation.

The divider ratio is designed to achieve an output voltage of approx. 1400 V at rated lightning impulse voltage and thereby reduce the influence of electromagnetic interferences. Other ratios or an attenuator to match the input voltage of other measuring devices can be made available.