Fast phase meter

The invention provides a quick phase meter relates to the measuring field of signal and phase. After a measured signal 1 and a measured signal 2 enter into corresponding signal modulating circuits, the amplitudes of the measured signal 1 and the measured signal 2 are firstly modulated; under the uniform sampling control, high-speed A/D sampling samples the measured signal 1 and the measured signal 2 to form a digital signal 1 and a digital signal 2. After being buffered by corresponding data, the digital signal 1 and the digital signal 2 are respectively processed in the way of data redundancy pretreatment, FFT conversion, spectral peak searching, arc tangent circulation and so on, thereby obtaining the accurate instantaneous phase data of the measured signal 1 and the measured signal 2 and working out the phase difference between the two measured signals. The quick phase meter can provide phase difference between the two measured signals through the data redundancy pretreatment and also can work out the respective instantaneous phase value of the measured signals at the same time, thereby overcoming the defect of the prior phase meter which can not provide the instantaneous phase values of measured signals.