1仪器的特点及用途a.特点:投影电表是用普通实验用的小电表(电流表、电压表、检流计均可)改装的。不需要改动原来电表的线路和机械转动部分;不需要调节校验刻度等手续;放大效果优于普通大型演示电表,而灵敏度较高;随时可以还原成改装前的电表。b.用途:适用于初、高中电学实验的 1 Characteristics and Uses of the Instrument a. Features: The projection meter is modified with a small meter (for ammeter, voltmeter, and galvanometer) that can be used for ordinary experiments. It is not necessary to change the line and mechanical rotating part of the original meter; there is no need to adjust the calibration scale and other procedures; the amplification effect is better than the ordinary large-scale demonstration meter, and the sensitivity is higher; the meter before conversion can be restored at any time. b. Uses: Suitable for the initial and high school electrical experiments