Figure 1 shows a typical PD signal measured in an 11 kV
PILC cable using HFCT installed on the earth strap. The rise
time and pulse width of the PD pulse shown are of the order
of a 100 ns. To capture these fast rising and low power pulses
it is necessary to have a data acquisition system with a
suitable dynamic range and on-board memory. Bandwidth
requirements for PD monitoring systems have been described
in [7, 8].