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目前使用的万用电表和繁用表是多种电学量综合测量仪表。这种仪表的基本原理是利用欧姆定律找出测定量与电流之间函数关系,用电流表测定该电学量。因此这种仪表不可避免地存在如下问题: 1.表头指针各挡零点和偏转方向不一致。例如电压挡零点在左边,指针向右偏转,电阻挡零点在右边,指针向左偏转。 2.表盘分度不统一。例如电压表是线性分度,电阻表是反比分度(倒刻度)。 3.反比分度表难易读最后一位有效数值(估计
The current use of multimeter and multi-table is a variety of electrical quantities of integrated measuring instruments. The basic principle of this instrument is the use of Ohm’s law to find out the relationship between the measured amount and the current function, with the ammeter measuring the amount of electricity. Therefore, this instrument inevitably has the following problems: 1. Head pointer each block zero and deflection direction is inconsistent. For example, the voltage is zero on the left, the pointer is deflected to the right, the resistance is on the right and the pointer is deflected to the left. 2 dial is not uniform. For example, voltmeter linear indexing, resistance meter is inverse scale (down scale). 3. Anti-scale table easy to read the last valid value (estimated