RC暂态电路实验的一个简易改进

A Simple Improvement on the RC Transient Circuit Experiment

采用市面上可购得的转接线,将模拟示波器所测RC暂态电路实验中电容器上的电压信号直接传输到计算机声卡中,用免费音频处理软件Audacity显示该信号,并将其转化为文本格式,最后用微软的Excel软件处理信号数据,拟合出时间常量等参数,使学生对充放电过程有更准确的理解.结果表明,本实验方法对时间常量的测量可取得2%左右的相对误差.

Using a com mercially available adapting cable ,we transmitted the voltage signal from the capacitor in an RC transient circuit ,as measured by an analog oscilloscope ,to the sound card of a PC directly .Then we used Audacity ,a free audio signal processing software package ,to display this signal and to convert it into text format .Lastly ,we applied Excellof Microsoft Office package to process the signal data and to estimate through function fitting the circuit parameters such as time constant ,providing students with insight into the nature of the charging and discharging processes .Results showed that the measurement of time constant with our approach could achieve a relative error of about 2% .