Digital pulse width measurement circuit is shown. It uses a l00kHz reference frequency, the count in the pulse width of the signal, the count value of the product of the resolu
tion on behalf of the measured value of the pulse width by four seven-segment LED display. Resolution circuit is 10 s, the maximum width is measured 99.99ms. IC2, IC3 dual BCD adder counter CD4518; IC4 ~ IC7 to BCD seven latch/decoder/driver CD4511.