Open Journal of Circuits and Systems
Vol. 08  No. 01 ( 2019 ), Article ID: 28902 , 4 pages
10.12677/OJCS.2019.81001

The Research on the Negative Reading of Voltmeter in AD590 Digital Thermometer Experiment

Huachun Wu, Li Wang, Xinyu Li, Miao Wang

School of Science, Xi’an Aeronautical University, Xi’an Shaanxi

Received: Jan. 29th, 2019; accepted: Feb. 12th, 2019; published: Feb. 19th, 2019

ABSTRACT

According to the temperature characteristics of the AD590, in the university physics experiment using the digital thermometer designed by it, some students’ voltmeters showed a negative value. In view of this phenomenon, this paper analyzes the potential from the perspective of potential, and finds out the specific reasons for the negative value, which provides a reference for the successful completion of the experiment.

1. 引言

2. 实验原理

$I=B\theta +A$

3. 实验内容 [2]

2) 当B = 1 μA/℃时，为了使温度变化1℃时，电压变化1000 Ω × 1 μA = 1 mV，因此选择R1 = R2 = 1000 Ω。确定输出电源电压的大小，保证在整个测温范围内AD590均工作在线性段。

3) 实际使用AD590时，B值大小约等于1 μA/℃，为使温度变化1℃，电压变化1 mV需要根据B值大小修正R1、R2，R1 = 1000/B，R2 = 1000 Ω。

5) 将实验中使用的智能加热器温度设定为60℃，待温度稳定后读取加热器显示的温度值及数字式温度计示数值，即电压表示值，修正系统误差。

Figure 1. Experimental circuit diagram

4. 试验结果与分析

Table 1. Positive electrode connected between R2 and R3

Table 2. Positive electrode connection between R1 and AD590

5. 结论

The Research on the Negative Reading of Voltmeter in AD590 Digital Ther-mometer Experiment[J]. 电路与系统, 2019, 08(01): 1-4. https://doi.org/10.12677/OJCS.2019.81001

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