用热电偶作温度测量时,必须注意二个问题:对若干被测点作经常性反复测量时,不容易做到使参考点的温度保持在 t=0℃。但如果能对参考点可能的温度变化作出自动补偿,问题就会简单得多。作为温度补偿桥路,它必须具备这样二项调整条件要求,其中之一就是要在桥路电源上串入一只负电阻。第二个就是在用热电偶作高灵敏度温度测量时必须设法把微弱的直流电压信号进行放大。然而, Thermocouple temperature measurement, we must pay attention to two problems: a number of measured points for repeated measurements regularly, it is not easy to make reference point temperature maintained at t = 0 ℃. But the problem can be much easier if there is automatic compensation for possible temperature changes at the reference point. As a temperature compensated bridge, it must have such two adjustment conditions, one of them is to bridge a negative resistor in series. The second is to use thermocouples for high-sensitivity temperature measurements when trying to amplify weak DC voltage signals. however,