A measurement method for measuring disruptions in a controlled electromagnetic field comprising the steps of: providing at least one electrode consisting of a sole conductive element; providing a controlled electromagnetic field sensor connected in a closed loop circuit to the at least one electrode , the controlled electromagnetic field sensor comprising: an oscillator comprising an active element, the oscillator being coupled to the at least one electrode , a digital module ; and a processor connected to the digital module ; connecting the oscillator to a transformer (L1, L2) whose secondary winding (L1) is further connected to the at least one electrode and whose primary winding (L2) is further connected to the active element of the oscillator ; and the method further comprises: polarising, at least, one input transistor (M IN ) of the active element of the oscillator through a polarisation network (R BIAS , V BIAS ); generating a controlled electromagnetic field surrounding the at least one electrode with the signal generated by the active element of the oscillator ; feeding this same signal to the input (M IN ) of the active element of the oscillator through a feedback network (R F , C F ); and digitally processing the same signal that is applied to the input (M IN ) of the active element of the oscillator in the digital module , such as to be acquired by the processor . providing at least one electrode consisting of a sole conductive element; providing a controlled electromagnetic field sensor connected in a closed loop circuit to the at least one electrode , the controlled electromagnetic field sensor comprising: an oscillator comprising an active element, the oscillator being coupled to the at least one electrode , a digital module ; and a processor connected to the digital module ; connecting the oscillator to a transformer (L1, L2) whose secondary winding (L1) is further connected to the at least one electrode and whose primary winding (L2) is further connected to the active element of the oscillator ; and the method further comprises: polarising, at least, one input transistor (M IN ) of the active element of the oscillator through a polarisation network (R BIAS , V BIAS ); generating a controlled electromagnetic field surrounding the at least one electrode with the signal generated by the active element of the oscillator ; feeding this same signal to the input (M IN ) of the active element of the oscillator through a feedback network (R F , C F ); and digitally processing the same signal that is applied to the input (M IN ) of the active element of the oscillator in the digital module , such as to be acquired by the processor . polarising, at least, one input transistor (M IN ) of the active element of the oscillator through a polarisation network (R BIAS , V BIAS ); generating a controlled electromagnetic field surrounding the at least one electrode with the signal generated by the active element of the oscillator ; feeding this same signal to the input (M IN ) of the active element of the oscillator through a feedback network (R F , C F ); and digitally processing the same signal that is applied to the input (M IN ) of the active element of the oscillator in the digital module , such as to be acquired by the processor . <EOS>