Method (METH) for measuring a phase shift φ induced by an analogue phase-shifting system (DP) operating at a frequency fo and delivering a known and practically constant signal amplitude A, characterised in that it comprises the following steps: a) from the frequency fo and an integer N given in parameters, generating a digital clock signal (Shn) of frequency N.fo, b) from the digital clock signal (Shn), generating a first digital reference signal (Sr1n) of shape cos(2π.fo.t), sampled according to the frequency N.fo of the digital clock signal (Shn), then: - analogically converting the first digital reference signal (Sr1n), so as to obtain a first analogue reference signal (Sr1a) - sending said first analogue reference signal (Sr1a) to the phase-shifting system (DP) - receiving from the phase-shifting system (DP) an analogue input signal (Sga) of shape A.cos(2π.fo.t+φ), where A is a proportionality factor - sampling the analogue input signal (Sga) according to the frequency N.fo of the digital clock signal (Shn), so as to obtain a digital input signal (Sgn) - multiplying point by point the first digital reference signal (Sr1n) and the digital input signal (Sgn), so as to provide a first digital product signal (SP1n) - summing N values of the first product signal (SP1n), in order to obtain a first sum (S1) of shape (n.A/2).cos(φ) c) at the end of the step of integration of § a), sending a triggering signal of step d), d) calculating the value of the phase shift φ by means of the first sum S1 e) as soon as the calculation means have acquired the information to be processed, and in parallel with this processing, sending a reset signal (Rst) of at least the first sum S1. a) from the frequency fo and an integer N given in parameters, generating a digital clock signal (Shn) of frequency N.fo, b) from the digital clock signal (Shn), generating a first digital reference signal (Sr1n) of shape cos(2π.fo.t), sampled according to the frequency N.fo of the digital clock signal (Shn), then: - analogically converting the first digital reference signal (Sr1n), so as to obtain a first analogue reference signal (Sr1a) - sending said first analogue reference signal (Sr1a) to the phase-shifting system (DP) - receiving from the phase-shifting system (DP) an analogue input signal (Sga) of shape A.cos(2π.fo.t+φ), where A is a proportionality factor - sampling the analogue input signal (Sga) according to the frequency N.fo of the digital clock signal (Shn), so as to obtain a digital input signal (Sgn) - multiplying point by point the first digital reference signal (Sr1n) and the digital input signal (Sgn), so as to provide a first digital product signal (SP1n) - summing N values of the first product signal (SP1n), in order to obtain a first sum (S1) of shape (n.A/2).cos(φ) - analogically converting the first digital reference signal (Sr1n), so as to obtain a first analogue reference signal (Sr1a) - sending said first analogue reference signal (Sr1a) to the phase-shifting system (DP) - receiving from the phase-shifting system (DP) an analogue input signal (Sga) of shape A.cos(2π.fo.t+φ), where A is a proportionality factor - sampling the analogue input signal (Sga) according to the frequency N.fo of the digital clock signal (Shn), so as to obtain a digital input signal (Sgn) - multiplying point by point the first digital reference signal (Sr1n) and the digital input signal (Sgn), so as to provide a first digital product signal (SP1n) - summing N values of the first product signal (SP1n), in order to obtain a first sum (S1) of shape (n.A/2).cos(φ) c) at the end of the step of integration of § a), sending a triggering signal of step d), d) calculating the value of the phase shift φ by means of the first sum S1 e) as soon as the calculation means have acquired the information to be processed, and in parallel with this processing, sending a reset signal (Rst) of at least the first sum S1. <EOS>