Described are probes and methods for detecting pathogens and antibiotic resistance of a specimen. Each of the protection zones includes a plurality of direct current buses and a plurality of power converters. An aim of the invention is to process the signals received before decoding the responses so as to allow the detection of mixed responses, and avoid the detection of ghost responses. The threshold values can further be adjusted by comparing the actual line voltage supplied to the motor with a predetermined nominal line voltage.