Zero -crossing time check out test set of power frequency sinusoidal ac signal

The utility model discloses a zero -crossing time check out test set of power frequency sinusoidal ac signal relates to the detection time technique in the electric signal measurement field. This equipment is: power frequency sinusoidal alternating current signal source (100), AD sampling circuit (210), logic AND computing circuit (221) and pulse driving circuit (240) connect gradually, pulse generating circuit (230) and controller (222) are connected with logic AND computing circuit (221) respectively. This method is: 1. Initialization, 2. Frequency parameter estimation, 3. Phase parameter estimates, 4. Zero -crossing time calculates and output. The utility model discloses can effectively detect the zero -crossing time of industry frequency alternate current analog electrical signal, andwith the error control within 1 mu s, the small phase error who can be used to between analog signal and the data signal measures, the traceability of value of the phase place of the being convenientfor degree of accuracy. 本实