【摘要】 外加电压通过热灵敏度漂移补偿自平衡电桥对压力传感器进行激励，其输出信号经热零点漂移补偿自平衡电桥电路后，用仪用放大器放大到满量程达５Ｖ电压，然后输送到比较电路、放大的压力值输出信号与分压电路的１０个基准电压分别输入到差动放大器的正和负端。当前者大于后者时，差动放大器便输出正电平，ＬＥＤ导通并发光。依据发光的ＬＥＤ个数可判断被测压力的大小。更多还原

【Abstract】 The pressure sensor was excited through SBI for compensating temperature drift of the sensitivity and after compensating temperature drift of null point with SBZ, its output signal was magnified with a meter magnifier to 5V for full scale pressure. This magnified signal was input to the positive terminals of comparers. As long as it is higher than the reference voltage on the negative terminals of comparers, a positive voltage will be output from their end terminals. The LED in series with them was lighted up by the current. So the measured pressure can be determined from the position of the highest lighted LED or from the numbers of the lighted LED.更多还原