Analysis of common error causes of hydraulic universal testing machine

Hydraulic universal testing machineIt is an advanced mechanical testing instrument in China, widely used in various hardware, metal, rubber and plastic, shoes, leather, clothing, textile, insulators, wires, cables, terminals and other materials. During the test process, it can automatically obtain conventional data such as elastic modulus, yield strength, tensile strength, fracture strength, sample elongation, and cross-section shrinkage. But errors are inevitable. The following are common errors in the test results of hydraulic universal testing machines summarized by Jinan Hengsi Shanda Testing Machine Manufacturing Co., Ltd. based on experience:
1. Hydraulic system error: errors that adhere to certain values ​​or changes in certain rules. System errors are regular, and this pattern is reflected in every detailed experiment. If you find this pattern, you can correct it.
Cause analysis:
1) The universal tester shows the value inaccurate, and the measured force value is always too large or too small.
2) The error of coefficients on the instrument panel when the resistance strain meter measures the strain.

2. Poor errors: Due to errors in the experimental work, ignoring the errors caused by carelessness. This error is irregular, and it is necessary to check it repeatedly to prevent it.
Cause analysis:
The operation of the universal test machine is incorrect, the experimenter reads the numbers wrongly, writes the decimal point position in the wrong recording, etc.

3. Random error: that is, if the same parameter is repeatedly measured under the same conditions, the measured value obtained cannot be complete and the same.
Cause analysis:
1) During the experiment, the friction force in the test machine changes
2) Changes in environmental humidity, etc.
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