Abstract: The invention relates to a method of detecting a shielding defect of a shielded cable mounted in a building which defines between an instrument and the shielding of the cable, a first stray capacitance; the method steps are:placing measurement apparatus in such a manner as to define a second stray capacitance between itself and the building;injecting a high frequency signal into the shielding of the cable, by means of the measurement apparatus, the signal circulating back to the apparatus via the first and second stray capacitances; andmeasuring on the core of the cable, a signal that appears by radiation due to the injection of the high frequency signal, and representative of a defect in the shielding of the cable.

Abstract: The detection of brief pulses generating high frequencies is carried out by a system including: sensor for detecting an electrostatic field and for detecting an electromagnetic field, such that the variation of the electrostatic field ocurring in a period of time of less than 1 millisecond may be identified. A signal activator for warning about the presence, in an interval of time of less than 1 millisecond, of the variation of the electrostatic field detected and of the electromagnetic field, allowing identification of a pulse due to an electrostatic discharge from furniture or human beings. The invention is applicable to the detection of pulses due to electrostatic discharges.