METHOD AND DEVICE FOR HIGH-ACCURACY MEASUREMENT OF PULSE FREQUENCY

摘要

PURPOSE:To accurately measure a pulse frequency by storing a pulse interval error per rotation of a rotary pulse generator previously and correcting a measured value with pulse intervals at the time of actual measurement. CONSTITUTION:A pulse from the rotary pulse generator 2 is used to reset a counter 4 and also store the contents of the counter 4 in a buffer 5 through a time delay element 41. At the time, the counted value of the counter 4 right before it is reset is latched in the buffer 5 through the operation of this element 41. Thus, the number of reference clock pulses between two successive rotary pulses is held in the buffer 5. Those rotary pulses set a FF 510 through a set line 511, so a microprocessor 9 monitors that. Consequently, it is known that the counted value is stored in the buffer 5 and the value is read out through a system 8, stored in a memory 10 and also processed, and then stored in the memory 10. Consequently, the pulse frequency is accurately measured.