| 基于 Multisim 8的 RC 一阶电路时间常数的测量 |
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| 引用本文： | 张学文,司佑全.基于 Multisim 8的 RC 一阶电路时间常数的测量[J].湖北师范学院学报(自然科学版),2013(4):80-83. |
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| 作者姓名： | 张学文 司佑全 |
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| 作者单位： | 湖北师范学院物理与电子科学学院,湖北黄石435002 |
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| 基金项目： | 湖北师范学院2011年指导性教研项目（ZD201121） |
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| 摘 要： | 在用示波器进行RC一阶电路时间常数τ的测量时，通常采用时标法测量输入信号脉冲宽度大于5τ情况下的时间常数，而当脉冲宽度小于5τ时，采用时标法比较困难。通过分析RC一阶电路充放电过程，得到τ＝（T/2）/ln（U01/U01），再利用Multisim8读出U02，U01，进而准确算出电路时间常数τ，从而克服了在脉冲宽度小于5τ的情况下应用时标测量法存在的困难。
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| 关 键 词： | RC串联电路 暂态过程 时间常数 |
The measurement on the time constant of first-order RC circuit with Multisim8 |
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| ZHANG Xue-wen,SI You-quan.The measurement on the time constant of first-order RC circuit with Multisim8[J].Journal of Hubei Normal University(Natural Science),2013(4):80-83. |
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| Authors: | ZHANG Xue-wen SI You-quan |
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| Institution: | (College of Physics and Electronic Science, Hubei Normal University, Huangshi 435002,China) |
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| Abstract: | For measuring the RC circuit＇s time constant with an oscilloscope , the time constant τ, which input signal pulse width is greater than 5τ, is usually measured using the method of time scale However , when the pulse width is less than 5τ, there is some difficulty if applying time scale method .In the present article , by analyzing the charge and discharge process of the first-order RC circuits, the authors obtain the formula τ=（T/2）/ln（Uo2/Uo1）.Then, find the value Uo2,Uo1 by use of Multisim8, and accurately calculate the time constant of the circuit , and so, overcome difficulty in applying the method of time scale measurement when the pulse width is less than 5τ. |
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| Keywords: | RC series circuit transient process time constant |
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