Standard 1.1 and instrument: GB/T 3916 method standard equivalent adopts ISO 2062 standard, applicable to all kinds of product standards covered by it. The standard stipulates that the CRE (equal speed elongation) type strength instrument is used, and the CRL type (equal plus load) and CRT type (isokinetic traction) used in the old standard are only used as the transition, which can be adopted according to the agreement. GB/T 3916 standard adopts constant speed drawing, and abandons the old standard of regular stretching. There are three different detection mechanisms, and there are great differences in the results. For example, the widely used CRT type instruments used in the past are regular stretching, and the instruments inevitably have mechanical friction and the "inverted pound" negative error of the self stopping mechanism. In addition, the uncertainty error caused by the inertia of the force measuring mechanism and the human error of the operator are often not allowed. Ignore。
The advantages of the 1.2 CRE single yarn strength tester: the CRE (isokinetic elongate) type strength instrument mostly adopts the non electric electric measurement technology. The mechanical friction and inertia of the force sensor are almost negligible, and the operator's artificial error is less, so the result is more accurate. In addition, the electrical measurement system can be connected with the computer, so the work efficiency is high, especially the powerful data analysis and preservation function, which is completely unparalleled by the CRT mechanical strength instrument.