什么是dBm，与dB、dBW的区别? - 知乎
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dB定义为任意两个给定点之间的功率或信号强度之差，而dBm则定义为功率的绝对值或强度，用于确定特定点的信号强度。 与dB不同，dBm是绝对测量单位。 dB代表一个相对数字，表示信号强度的增加或减少。 dBm表示在给定点上（相对1mw）信号强度的绝对度量。
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