T/HBJLXH 001-2023 Calibration Method for Low Temperature Brittleness Testing Machine

Scope

Main technical content: 4. Measurement characteristics 4.1 Mechanical part a) Distance from the center of the impactor to the lower end of the clamp: Rubber: (8 ± 0.3) mm, (11 ± 0.5) mm; Plastic: (3.6 ± 0.1) mm; b) Impact position: The distance between the impactor and the sample is (25 ± 1) mm; the impact stroke is (40 ± 1) mm. 4.2 Temperature part Temperature control range: (-80 to 0) °C, with a maximum allowable error of ±0.5 °C; after temperature stabilization, the temperature fluctuation within 3 minutes of the test should be ≤ ±0.5 °C. 6. Calibration method 6.1 Visual inspection Check whether the instrument's mechanical functions are operating normally and whether the data display is functioning properly. 6.2 Calibration of the mechanical part a) Measure the distance from the center of the impactor to the lower end of the clamp using a caliper. Take the average value of three measurements. b) Measure the distance between the impactor and the sample and the impact stroke using a caliper. Take the average value of three measurements. 6.3 Calibration of the temperature part After setting the temperature of the testing machine, insert the thermometer into the temperature-control tank of the testing machine, start the testing machine, and wait for the temperature to stabilize. Read the display value at least 6 times per minute for 3 minutes. Take the difference between the arithmetic average of the testing machine's display value and the reading as the testing machine's temperature display error. Take the maximum and minimum values of the reading and add a "±" symbol to represent the testing machine's fluctuation within the corresponding time interval.

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