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270T220E252A1A

Description
Industrial 16mm Diameter Carbon Composition Ratary Potentiometer
File Size235KB,9 Pages
ManufacturerCTS
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270T220E252A1A Overview

Industrial 16mm Diameter Carbon Composition Ratary Potentiometer

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因为任何测量需要一个基准,测量时间或者频率,例如1S,我们肯定木有原子銫钟,所以需要用晶振,但是晶振还是有差异性的,你用的仪器和和专家用的仪器有所差异,所以以你的100M晶振为准,专家用仪器测你的晶振是100.01M的 那么你所有测试频率 都乘以一个序数100/100.01,以保证公平性。为什么不是PLL,因为比赛很少做比较少频率的,虽然N/M可以很多频率,一般需要连续可调的,而且只做PLL也太简...
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