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磁电系电流表是测量电流的常用仪器,它可以直接测量电流的范围一般在几十微安至几十毫安之间,如果要用它来测量较大的电流,必须扩大电流表的量程。当仪表利用分流器扩大量程时只有在分流器或分压电阻的电阻值和测量机构的电阻保持不变时才能得到准确的测量结果。否则仪表的读数将会产生与温度有关的温度误差: 1.指针转动的弹性元件随温度的升高其弹性会减弱。
Magnetoelectric ammeter is commonly used to measure the current instrument, which can directly measure the current range of tens of microamps to tens of milliamps, if you want to use it to measure a larger current, you must expand the ammeter range. When the meter uses the current divider to expand the range, the accurate measurement result can be obtained only when the resistance value of the current divider or the dividing resistor and the resistance of the measuring mechanism remain unchanged. Otherwise the reading of the instrument will produce temperature-related temperature error: 1. The elasticity of the rotating elastic element of the pointer will decrease as the temperature increases.