System for acquiring and recording signals delivered by a set of sensors disposed in well probes

System for acquiring and recording signals delivered by a set of sensors disposed in one or more probes which are lowered into a well at the end of a multi-function cable provided with signal transmission lines, comprising an acquisition assembly disposed in a probe and having signal amplification means, analog-to-digital conversion means, means for adapting the signals before they are applied to at least one line of the multi-function cable and synchronization means, and a control and recording assembly disposed on the surface and connected to the signal transmission lines, which system further, comprises a signal multiplexing assembly formed of at least two parallel multiplexing units each having the same number of input channels, the outputs of the two multiplexing units being interconnected to the input of the acquisition assembly and the input channels of one at least of these two units receiving the signals coming from said sensors, control means for enabling a sing-e multiplexing unit at a time so as to select the input channels thereof and means for controlling the switching of the input channels of the multiplexing assembly at a frequency independent of the number of multiplexing units used, so as to cause the readout frequency of each of the input channels connected to a sensor to vary as a function of the number of multiplexing units used.