Reference dividers are used for comparative measurements for the calibration of measuring systems. Reference dividers type RCZ are designed for the calibration of voltage dividers for AC, DC, full and tail chopped impulse voltages. Of course they can be used for normal measurements also.

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

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

Standards

IEC 60060-1

IEC 60060-2

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DESIGN
parallel with these RC elements.
type RCZ consists of one oil-filled capacitor assembly that is housed in a cylinder made out of glass fibre reinforced epoxy resin.

A series damping resistor is inserted between the capacitor elements of the unit and acts as 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 measuring devices can be made available 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 vol tage of other measuring devices can be made available​​