测量直流电压电流，在数码管上显示，并且可显示功率。
Measuring DC voltage and current, the LED display, and display power.
J 0403型高中演示电表共有十四档量程，供教学演示实验中作检流计，测量微小电流，测量直流电压、直流电阻。
Demonstrating Electric Meter, Model J0403 has 14 ranges. It can serve as current detector in the experiment demonstration, measurement of micro current. DC voltage and DC resistance.
对于交流电压测量﹐利用有效值转换电路或精密整流器电路将交流信号转换成直流电压。
For AC voltage measurement, an RMS converter circuit or a precision rectifier circuit convert the AC signal into a DC voltage.
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