1. The measurement and control system of the test machine. At present, most of the measurement and control system of the pull machine on the market is controlled by 8 bit microcontroller. The sampling rate is low, and the anti-interference ability is poor. In addition, the AD converter is also used. If the number of AD converters is low, then the measurement is not accurate.

二、试验机的力值传感器。因为传感器的好坏决定了试验机的精度和测力稳定性，目前市场上的拉力机用传感器小力值一般用S型传感器，大力值一般用轮輻式传感器，传感器内部一般为电阻应变片式，如果应变片精度不高或固定应变片用的胶抗老化能力不好在或者传感器的材料不好都将影响传感器的精度和使用寿命。

Two, the force value sensor of the test machine. Because the sensor determines the accuracy of the test machine and force stability, the current Rally machine on the market with a small force sensor value of S sensor is generally used, large value spoke sensor for general use, the sensor is generally resistance strain gage, if the accuracy is not high or fixed with plastic strain aging resistance not good or bad sensor materials will affect the precision and service life of the sensor.

三、试验机的传动系统。目前市场上的试验机传动系统有的采用减速机，有的采用普通皮带，这两种传动方式的主要弊端：前种需要定期加润滑油，后种则保证不了传动的同步性影响试验结果。

Three. The transmission system of the test machine. At present, some of the main disadvantages of the two transmission modes are the reducer used in the test machine transmission system, some ordinary belts, and the conventional ones. They need regular lubricating oil, and the latter can not guarantee the synchronicity of the transmission, which will affect the test results.

四、试验机的驱动传感器运动的部件滚珠丝杆。因为丝杆如果有间隙的话将来做出的试验数据，将直接影响试验的较大变形和断后伸长率。

Four. The ball screw of the moving part of the test machine. Because the wire rod if the experimental data gap if future, will directly affect the deformation and elongation test.

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