Voltage dividers / coupling capacitors of the series KK consist of 1 or more modular units, built into glass fibre reinforced epoxy tubes. Decouples partial discharge signals from device under test (DUT) when used with an optional measuring impedance (AKV/AQS). Measures AC voltages in the industrial frequency range. Attenuates interferences coming from the HV side and improving signal to noise ratio (SNR) of the PD measuring circuit (together with an optional HV filter). The standard design includes a base frame with swivel castors for mobility and an appropriate upper toroid.