Description: Measuring signal: square wave measurement frequency range: 1Hz ~ 9999Hz display: four decimal 4. Time base circuit 555 timer and divider 555 oscillator pulse signal time base signal generated by the prescaler, the pulse width as follows: 1s, 0.1s when the measured signal frequency exceeds the measuring range, the alarm.
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23824648数字频率计\Digital frequency meter.doc
23824648数字频率计
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