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1原理虽然测量温度的方法很多，但图1所示的电路提供了一种测量与记录实际温度变化的简便方法，只需一台配有RS-232通信口的普通PC即可。T1（LM334温度传感器）产生与实际温度成正比的恒定电流。当温度达到323K（50℃）时这一电流值为25μA，可由R1来设置这一比例常数。其分流
1 PRINCIPLE Although there are many ways to measure temperature, the circuit shown in Figure 1 provides an easy way to measure and record actual temperature changes by simply using an ordinary PC with an RS-232 communication port. T1 (LM334 temperature sensor) produces a constant current proportional to the actual temperature. This current is 25μA when the temperature reaches 323K (50 ° C), which can be set by R1. Its diversion