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一般衡器的零点是指未加载荷时称量值显示零的状态,但机械秤和电子秤则有很大的不同。机械秤的称量原理是以空秤平衡方程为基础,通过移动游铊和加增铊与载荷平衡达到称量的目的,所以零点的调校至关重要。规程中对零点有很严格的要求。电子秤的称量原理是把载荷转换成相应的电信号,经A/D转换(即模拟量/数字量转换),显示出载荷数量。电子秤的零点是传感器初始输出、秤台面相应电信号输出和输入调零电路输出三者信号之和。只要传感器线性关系正确,就可满足称量要求,与零点是否平衡没有直接关系。电子秤之所以要设法保持稳定的零点,只不过是使其更加直观罢了。
The zero point of a general weighing instrument refers to the state that the weighing value shows zero when no load is applied, but there are great differences between the mechanical scale and the electronic scale. Mechanical weighing scale principle is based on the empty balance equation, by moving the tourmaline and increase the balance of thallium and load to achieve the purpose of weighing, so zero calibration is crucial. There are strict rules on the zero point. Electronic weighing scale principle is to convert the load into the corresponding electrical signals, the A / D conversion (that is, analog / digital conversion), showing the number of loads. The zero point of the electronic scale is the initial output of the sensor, the corresponding electrical signal of the weighing platform and the output of the input zeroing circuit are the sum of the three signals. As long as the sensor linear relationship is correct, we can meet the weighing requirements, and zero is not directly related to the balance. The reason why electronic scales try to maintain a stable zero point is just to make it more intuitive.