METHOD OF MEASURING FEQUENCY (VERSIONS) AND DEVICE FOR REALISING SAID METHOD (VERSIONS) Russian patent published in 2010 - IPC G01R23/02 

FIELD: physics.

SUBSTANCE: frequency measurement device includes: a pulse former, a control unit, a reference frequency generator, a unit for counting reference frequency pulses, a "Ready" signal conditioner, a counter for counting the number of code shifts, a buffer register, a shift register and read-only memory (ROM). The disclosed frequency measurement method is characterised by that a frequency value f_ch rounded upwards to the closes value f_ch=2^Q·10⁶ Hz is given. Numbers N_tk, obtained after measuring period T_x in n_min least or most significant bits of the counter, are transmitted to address inputs of the ROM. The value of the number N_ROM is determined with pre-recording into ROM for each value of N_tk in the range from to . If the conditions n_min<n_meas≤n_max, n_meas=n_min+m1 or n_min≤n_meas<n_max, n_meas=n_max-m2, are met, the number N_tk is shifted m1 or m2 times towards least or most significant bits. The number m1 or m2 of shifts is recorded and the frequency f_x1 or f_x2 of the analysed signals is determined.

EFFECT: increased reliability and accuracy of measuring frequency.

4 cl, 3 dwg, 3 tbl