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有些老式演示电流计 (如原南京教学仪学仪器厂、新安江电表厂生产的演示电流计 )稍加改装 ,使其量程与 J0 4 0 7、J0 4 0 8型学生分组用直流安培计、直流伏特计的量程一致 ,在演示电路联接等实验时 ,由于两者量程相同 ,使用和讲解都较方便。由于生产厂家和生产年代不同 ,电路安
Some old-fashioned demonstration galvanometers (such as the original Nanjing pedometer instrument factory, demonstration galvanometer produced by the Xin’anjiang Electric Meter Factory) were slightly modified to have a range of dc ammeters for J 0 4 0 7 and J 0 4 8 student groups. The range of DC voltmeters is the same. When the demonstration circuit is connected and other experiments, because the two ranges have the same range, it is more convenient to use and explain. Due to different manufacturers and production years, circuit safety