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本文介绍一种简单的四端交流电桥,可用作低温铂电阻温度计之类的传感器。这种新型电桥如图1所示。一对相匹配的变压器(T_1和 T_2)设置在电流放大级的反馈回路中。因此 T_1和 T_2可由同一恒定电流 i_1驱动,并向传感器(R_x)和标准电阻(R_s)的独立回路输入同一恒定电流 i_1驱动,并向传感器(R_x)和标准电阻(R_s)的独立回路输入同一恒定电流 i_2。因为这种温度控制器的工作频率 f 是1 kHz
This article presents a simple four-terminal AC bridge that can be used as a sensor for low-temperature platinum resistance thermometers. This new bridge is shown in Figure 1. A matched pair of transformers (T_1 and T_2) are placed in the feedback loop of the current amplifier stage. Therefore, T_1 and T_2 can be driven by the same constant current i_1 and driven by the same constant current i_1 to the independent loops of the sensor (R_x) and the standard resistor (R_s), and can be input to the independent loops of the sensor (R_x) and the standard resistor (R_s) Constant current i_2. Because this temperature controller operating frequency f is 1 kHz