本标准适用于以下类型的直流和交流电气指示仪表，包括带有前缀的仪表，如微、千等:（1）电流表（2）电压表（3）瓦特表（4）瓦特表（无功伏安表）（5）频率表（6）功率因数表（7）根据上述原理工作的指示仪表，但指示衍生量1.2除适当例外，本标准可适用于为特殊要求制造的仪器。例如，超灵敏直流微电流表、高电阻电压表、热毫安表、真空耦合型热电压表，以及具有特殊和不寻常量程的仪器。1.3本标准不适用于以下类型的仪器:（1）配备曲线绘制、触点制作等装置的指示仪器（2）类型和尺寸仅为近似指示的小型仪器； 例如，汽车上使用的小型极化叶片安培计、电池充电装置等

This standard applies to the following kinds of electrical indicating instruments for direct and alternating current, including instruments with prefixes such as micro-, kilo-, etc: (1) Ammeters (2) Voltmeters (3) Wattmeters (4) Varmeters (reactive-volt-ampere meters) (5) Frequency meters (6) Power-factor meters (7) Indicating instruments functioning on the above principles, but indicating derived quantities 1.2 This standard may apply, with suitable exceptions, to instruments constructed for special requirements. For example, ultrasensitive direct-current micro ammeters, high-resistance voltmeters, thermo-milliammeters, thermo-voltmeters of the vacuum-couple type, and instruments with special and unusual ranges. 1.3 This standard does not apply to the following kinds of instruments: (1) Indicating instruments provided with arrangements for curve drawing, contact making, etc (2) Small instruments of types and sizes where the indications are only approximate; for example, small polarized-vane ammeters used on automobiles, battery-charging outfits, etc