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教学用电表有演示用大型电表,和学生用的小电表(直流安培计、直流伏特计和灵敏电流计).电表的主要部件是表头.同一个表头,加上不同的附件,就构成不同用途的电表.与表头并联分流器,是安培计;与表头串联倍增电阻——也叫附加电阻(或分压电阻)是伏特计.所以了解表头的构造和各部分的作用,对检修电表是必要的.教学用的电表大都采用磁电式表头.磁电式表头有外磁式和内磁式两种:外磁式表头的磁钢在极靴外,动圈中心是软铁芯;内
Teaching electricity meters have large electric meters for demonstrations, and small electric meters for students (DC ammeters, DC voltmeters and sensitive ammeters). The main part of the meter is the meter header. The same meter header, plus different accessories, constitutes Meters with different uses. The shunt is connected in parallel with the header. It is an ammeter. The series resistance is connected in series with the meter head. Also called the additional resistor (or voltage divider resistor) is a voltmeter. So understand the configuration of the meter head and the role of each part. It is necessary to repair and repair the meter. Most of the meter used in teaching use the magneto-electric meter. The magneto-electric meter has two types: external magnetic and internal magnetic: magnetic steel with external magnetic head outside the pole shoe, dynamic center It is a soft core;