| 摘要 |
measurement technology, design of digital tachometers and frequency meters. SUBSTANCE: gear forming measurement time interval has standard frequency generator, time counter, flip-flop, three logic AND gates, additional counter, decoder and switch. Output of standard frequency generator is connected to input of additional counter whose outputs are coupled to proper inputs of decoder. First output of decoder is connected to setting input of flip-flop whose inverse output is connected to first inputs of first and second logic AND gates. Second output of decoder is connected to counting input of time counter whose outputs are connected via switch to inputs of third logic AND gate. Output of the latter is connected to reset input of flip-flop. Third output of decoder is connected to second input of first logic AND gate which output is connected to reset input of time counter and fourth output of decoder is connected to second input of second logic AND gate. EFFECT: design of simple, functionally complete, universal gear controlling digital tachometer that forms any required time interval which enables measurement of rotational speed of revolving parts of machines and mechanisms to be conducted with use of wide range of various revolution transmitters. 2 dwg |
