The electronic tension machine is one of the main test equipments in the laboratory. The accuracy of the accuracy has a great influence on the test results, so the calibration of the electronic tension machine is particularly important.
According to the force value of the test section of the test machine, the standard tensile force sample of the corresponding force value is clamped on the test machine, and the test machine is used to stretch the standard tensile force sample according to the speed specified in GB/T228-2002 standard, when the standard tensile force is applied. When the sample is in a stretched state, an extensometer or a strain gauge is attached thereto, and the electronic tensile machine continues to stretch the standard tensile test piece, and the extensometer or the strain gauge displays the elongation of the standard tensile test sample. The elongation is converted into the tensile force value, and then compared with the same force value point on the electronic tension machine dial and the standard tensile force sample, and the technical state and accuracy of the testing machine are determined according to the difference of the comparison values. The method uses Hooke's law to compare the elongation of the standard tensile test piece with the force value and the test machine disk force value to determine the accuracy of the test machine. The method greatly simplifies the operation process of the verification, and brings great convenience and standardization to the daily verification of the original tensile state of the testing machine.
The verification method of the electronic tension machine produced by Jiangsu Tianhui is characterized in that firstly, according to the force value of the tested section, the standard tensile force sample is selected, and the force value of the standard tensile force sample is 60% to 90% of the full-scale force value of the interval. Between the selection, the standard tensile test specimens are clamped on the electronic tensile machine, and the electronic tensile machine is stretched against the standard tensile test specimen according to the speed specified in GB/T228-2002. When the pointer is slightly swung, the stretching is stopped immediately. That is, the standard tensile test specimen is in a stretched state. At this time, an extensometer or a strain gauge is attached to the standard tensile test specimen, and the standard tensile test specimen is continuously stretched according to the speed specified in the GB/T228-2002 standard, and the extensometer or The strain gauge shows the elongation of the standard tensile specimen. According to Hooke's law, the elongation is converted into the tensile value, and then compared with the same force point on the dial as the standard tensile specimen, according to the comparison value. The difference is to determine the technical state and accuracy of the test machine.
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