The calibration of four-terminal-pair(4TP) impedance meters at their working frequencies requires the knowledge of 4TP standard capacitor frequency characteristic.

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。

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The control circuit is a self-balancing current loop which makes use of a four-terminal resistor of nickel wire to assure a close-loop both electrically and thermally.

控温电路采用四端电阻自平衡电流环路，从而保证其电气和温度均处于闭环状态。

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The extended equations of two-port network are given on the basis of the four-terminal characteristic. The effective conditions of two-port network connection are presented.

以四端网络的端口特性为依据，提出了双口网络的补充方程。应用该方程得出了双口网络联接的有效性条件。

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