This will cause rate multipliers U4 to U6 to generate 1000 × f2/4096, or 1 MHz for f2 = 4.096 MHz. U7 divides this down to 244 Hz, and U8 measures the period as f3/244 Hz, or 524 for f3 = 128 kHz.

Engineers occasionally need to measure very low frequencies between 1 and 100 Hz, but getting an accurate reading is difficult. The solutions are to use a suitably long gate time ...