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ES51961 Datasheet(PDF) 11 Page - Cyrustek corporation |
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ES51961 Datasheet(HTML) 11 Page - Cyrustek corporation |
11 / 26 page ES51961 3 3/4 MANU DMM 2006/1/24 11 Frequency Counter The timebase of ES51961 is derived by a crystal or internal RC clock oscillator. The timebase of counter is : 4,000,000 Tcount = Fosc Thus, the counter will operate with a 1 second timebase when a 4MHz crystal oscillator is used. For accurate frequency measurement, a crystal oscillator is recommended. The frequency counter can automatically select the proper range. Autorange operation extends over five decades from 1 Hz to 399.9 MHz. Range Full Scale FR1 FR2 FR3 FR4 FR5 FR6 3.999 KHZ 39.99 KHZ 399.9 KHZ 3.999 MHZ 39.99 MHZ 399.9 MHZ <4> Period input(10M) 0.1 us Hi Lo <5> Unknow VH(4.0,2.4,1.5V) VL(0.8V) input 300 ms 300 ms 0.5~1 ms |
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