对四端对阻抗测量仪在其使用频段内进行校准，须确定四端对标准电容器的频率特性。
The calibration of four-terminal-pair(4TP) impedance meters at their working frequencies requires the knowledge of 4TP standard capacitor frequency characteristic.
然后，借助于研制的精密四端对-单端口转换器，用四端对阻抗测量仪测量单端口电容器容量值；
Secondly, with the aid of developed 4TP-single-terminal-port transform device, capacitance value of single-terminal-port capacitor is measured by 4TP impedance instrument.
在负载为纯力抗的状况下，利用纵振型变幅杆等效四端网络，对频率方程和放大系数进行了研究。
Based on equivalent four-terminal networks of the longitudinal ultrasonic transformer, the resonant frequency equation and the amplitude magnification coefficient, with reactive load, are studied.
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