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本文对恒流法测量扬声器阻抗曲线,进行了详细的讨论。根据实验曲线和数据证明了扬声器阻抗曲线及相关参数共振频率fr品质因数Q都随测量电流的变化而变化。指出测量电流应选在共振频率的稳定区。提议以50mA测量电流代替IEC268-5(1972)公告提出的10mA或100mA。从理论上分析了扬声器共振频率的变化是由扬声器振幅的非线性所致。并找出共振频率稳定区与振膜“力—位移曲线”线性部分的对应性。
In this paper, constant current measurement speaker impedance curve, a detailed discussion. According to the experimental curves and data prove that the speaker impedance curve and related parameters of the resonant frequency fr quality factor Q with the measured current changes. Pointed out that the measured current should be selected in the resonance frequency of the stable zone. It is proposed to measure the current at 50mA instead of the 10mA or 100mA proposed in the IEC 268-5 (1972) bulletin. It is theoretically analyzed that the change of the resonant frequency of the loudspeaker is caused by the nonlinearity of the amplitude of the loudspeaker. And find the correspondence between the resonance frequency stability zone and the linear part of the “force-displacement curve” of the diaphragm.