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本文介绍一种外形小巧的简易数字巡回测温仪。采用PMOS集成电路。检测容量为十点,测温元件为铂热电阻,量程0～199℃,测量精度为±1％,采样手段有自动和手动步进选点两种,采样速率连续可调,经长期实际使用,证明该仪表稳定可靠。文中对其工作原理作了简单的说明,对桥路计算、数码网络及晶体管开关作了简明的分析,并给出了必要的设计计算方法及数据。
This article describes a compact, compact digital touring thermometer. Using PMOS integrated circuits. Detection capacity of 10 points, temperature components for the platinum resistance, range 0 ~ 199 ℃, the measurement accuracy of ± 1%, sampling means automatic and manual stepping point two, the sampling rate continuously adjustable, after long-term actual use , Prove that the instrument is stable and reliable. In this paper, the working principle of the bridge is briefly described. The bridge calculation, digital network and transistor switching are briefly analyzed, and the necessary design and calculation methods and data are given.