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常用的电压表及大量程电流表都是由小量程的电流表G(表头)改装而成的.表头的工作原理:当线圈中有电流通过时,线圈在安培力作用下带动指针一起偏转,电流越大,指针偏转的角度越大,可以证明I∝θ,所以根据表头指针偏转的角度可以测出电流的大小,且表盘刻度是均匀的.表头的三个参数:内阻Rg,满偏电流
The commonly used voltmeter and a large range of ammeter is a small range ammeter G (header) converted from the table header works: When the current in the coil through the coil under the action of Ampere pointer driven together deflection, The larger the current, the larger the deflection angle of the pointer, Iαθ, so according to the angle of the meter pointer deflection can be measured current size, and the dial scale is uniform.The header of the three parameters: internal resistance Rg, Full partial current