分析液压万能试验机误差原因

下面分析一下在试验结果中的误差表现以及原因，共三点。

The analysis of the test results of error performance as well as the reason, a total of threepoints.

一、随机误差：即在相同的条件下，对同一参数反复停止屡次丈量，所得到的测定值也不可能完整相同。原因可能：在实验过程中，试验机内摩擦力的变化；环境湿度等的变化。

A: namely, the random error in the same conditions, the same parameters repeatedlyrepeatedly measured, the measured values cannot be completely the same. Reason: in the course of the experiment, the change of internal friction test machine; change of environment humidity etc..

二、液压系统误差：坚持一定数值或者一定规律变化的误差。系统误差是有规律的，这种规律表现在每一次详细的实验中，找到这种规律，就能够加以修正。

Two, the hydraulic system error: error to change certain numerical or certain laws. System error is the law, the law in every detail in the experiment, found the law, can be modified.

原因：万能试验机示值不准，所测得的力值总是偏大或偏小。电阻应变仪丈量应变时，仪器面板上的系数的误差。

Reason: the value not shown universal testing machine, the measured force value is too large or too small. Resistance strain gauge measuring strain, error coefficient on the instrument panel.

三、差错误差：由于实验工作中的错误，忽略大意等缘由惹起的误差。这种误差是没有规律的，需求重复核对方可防止。

Three, the error error: due to experimental errors in the work, ignore the error effect etc. the cause. This error is not regular, repeating each other can prevent nuclear demand.

原因：万能试验机操作错误，实验人员看错了数字，记载时写错了小数点位置等。

Reason: the universal testing machine operation error, the wrong number, records the wrongdecimal point.