Measuring fabric tear strength is a way to evaluate fabric properties and is usually performed using specialized testing instruments. The following are the general test steps:

1. Prepare the sample: Cut an appropriately sized sample, usually rectangular in shape, from the fabric. Depending on the test requirements, some specific points or lines may be marked on the sample.

2. Attach the sample: Clamp the sample to the test machine, making sure it is tightly pulled and free of wrinkles or warps.

3. Perform the test: Start the tester and make it start stretching the sample. The tester applies a gradually increasing tension to the sample until the sample is torn. During the test, the tensile force and the pulling force when the sample breaks are recorded. In general, the slower the test speed, the higher the measured tear strength.

4. Analyze the results: The tear strength of the sample is calculated from the test results. Tear strength is usually expressed in units such as Newtons/meter or pounds/inch. In addition, parameters such as the elongation and tear pattern of the sample at break can be calculated.

It is important to note that the tear strength of a fabric is affected by many factors, such as the material of the fabric, its thickness, fiber orientation, and the manufacturing process. Therefore, when conducting the fabric tearing strength test, it is necessary to select the appropriate test method and test conditions according to the specific test requirements to ensure the accuracy and repeatability of the test results.

The commonly used fabric tearing strength tester complies with standards including ASTM D2261, ISO 13937-1, GB/T 3917.2, etc. The specific test methods and requirements can be referred to the relevant standards.