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美国控制和读出公司生产了一种108PC型压力指示器及附带的传感器。该仪表为了对齐纳势垒和连接表板的长导线的电阻变化进行自动补偿,在设计中采用了恒流电源。在指示器和传感器之间采用一种简单的四线
The U.S. Control and Readout Company produces a Type 108PC pressure indicator and accompanying sensor. The meter automatically compensates for changes in the resistance of the long wire of the Zener barrier and the connection dash board, using a constant current power supply in the design. Use a simple four-wire between indicator and sensor