An apparatus for measuring the vectorial characteristics of a frequency shifted, amplitude-modulated electrical signal

摘要

A device for measuring the characteristics vector of an electrical signal, comprising an analysis device (30) of the spectrum is connected between a transmitter (10) and a receiver (20) of the electrical signal in relation to the operation for analyzing the spectrum of the electrical signal received by the receiver. It also comprises a generator (40) of a marking signal having a carrier frequency fm and a marking circuit (60) amplitude modulation of the signal received by the receiver, in response to the signal for marking, to provide the analysis device of the spectrum of a signal whose spectrum is formed of a carrier at frequency fo and two lateral strips to the frequencies fo - fm and fo + fm. The generator (40) of the signal for marking is connected to the marking circuit (60) by a galvanic connection to make the measurement independent of the parasitic couplings on the cables connecting the receiver to the analysis device of the spectrum.