Digital frequency meter can achieve 0.1--- 50khz frequency of testing, measuring less than 1000 weeks of method used, more than 1000 automatically to count, the maximum error is less than one thousandth, keeping within one ten thousandth . Test board with 12Mhz crystal, 74,164 static digital display, CD4051 signal conditioning input TTL square wave signal.

科大频率计.doc

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