Wide-range and high-precision frequency meter based on single chip microcomputer

• Main Author: YUE ZHIMING
• Format: Patent
• Language: Chinese; English
• Published: 07.08.2013
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The utility model relates to the technical field of electronics, and particularly relates to a wide-range and high-precision frequency meter based on a single chip microcomputer. The wide-range and high-precision frequency meter comprises a single chip microcomputer, a fractional frequency pulse input automatic switching circuit of a buffer expanded input chip U6; a digital tube programming and reshaping display circuit of an expanded output programming chip U5, a level width time circuit and a crystal oscillator self-oscillation circuit, wherein a P1 port of the single chip microcomputer is connected to an external data selector U7, an external chip counter U3 and an external chip counter U4 which are mutually connected, and the external chip counter U3 and the external chip counter U4 are connected with a driving current circuit of an inverter and a relay chip U2; the fractional frequency pulse input automatic switching circuit is connected to a P0 port of the single chip microcomputer and connected with th