Present Value (当前值)标签中的4 MHz计数值在Scaler (定标器)标签 所设置的脉冲序列范围内递增。
采样周期的时间长度随进入频率变化而变化。进入频率越小,时间 越长。
周期
*-定标器值为1时,使用占空因数50%才能准确计算频率。 Present Value (当前值)标签中的4MHz计数值递增。
重要事项
采样周期与定标器值的乘积小于0.25秒,否则 计数器将溢出,但不会发出溢出指示。
下表显所示为频率增大和采样脉冲数减少这一反关系。
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