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为了测量射频同轴电缆在30～300兆赫频率下的衰减,一般是用高频阻抗(或导纳)电桥测量电缆谐振频率下的输入阻抗 R_(max)(或 R_(min)),然后根据下式计算出电缆的衰减常数α:
To measure the attenuation of a radio frequency coaxial cable at a frequency of 30 to 300 MHz, the input impedance R max (or R min) at the resonant frequency of the cable is typically measured using a high frequency impedance (or admittance) bridge and then According to the following formula to calculate the cable attenuation constant α: