Method for measuring frequency of sinusoidal alternating voltage and the system for measuring the frequency of sinusoidal alternating voltage

摘要

in the way and the measured instantaneous values of voltage sinusoidalnie four variable in equal intervals ts smaller than 1 / 2 period t voltage receiving respectively results u1 = u (t1), u2 = u (t2), u3 = u (t3), u4 = u (t4), where t1, t2, t3, t4 subsequent measurements are sometimes. the basis of measurement results is calculated sinusoidalnie variable frequency voltage.analog to digital converter system includes measuring signal value napiu0119ciowego value proportional to the voltage at the input terminals.the measurement result of analog to digital converter is sent to the line buffer memory units connected in series four, which results from the last four measurements, which are connected with the calculation of the parameter? who shall calculate the value of the auxiliary parameter? the first four, measured values of instantaneous voltageand any subsequent momentary voltage measured values. the calculated value of the parameter? this system transmits to the calculation of the frequencies, which on its basis and the sampling period ts is calculated by frequency voltage value sinusoidalnie variable, which sends to the interface of the measuring system.