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中学物理教学用的万用电表有J0410型(演示用)和J0411型(学生用)两种,为磁电式整流系仪表(指针式)。本文介绍几种不改变教学万用电表任何内部结构来扩展其测量功能和量程范围的简易方法,以满足日益发展的物理实验教学和仪器维护工作需要。1 用220V和250V交流电压挡测电容 根据电容器(或电感)在交流电路中所产生的压降的大小,可以计算其电容量(或电感量)。因此,无电容和电感测量功能的万用电表可利用220V交流稳压电和250V交流电压挡来测量电容量和电感量的大小。
The multimeters used in middle school physics teaching are J0410 (for demonstration) and J0411 (for students). They are magnetoelectric rectification instruments (analog type). This article describes several simple methods that do not change any internal structure of the teaching multimeter to extend its measurement function and range to meet the growing needs of physical experiment teaching and instrument maintenance. 1 Use 220V and 250V AC Voltage to Measure the Capacitance According to the voltage drop generated by the capacitor (or inductor) in the AC circuit, its capacitance (or inductance) can be calculated. Therefore, the universal meter without capacitance and inductance measurement function can measure the capacitance and inductance using 220V AC voltage regulator and 250V AC voltage screen.