According to the acceleration speed required by the test, slowly unscrew the oil delivery valve to apply force. After the test breaks, close the oil delivery valve. If the interval between the next group is relatively long, the oil pump should also be stopped.
Remove the test tube. For models equipped with hydraulic chucks, first press the “up” button to loosen the upper jaw, then press the “down” button to loosen the lower jaw, and remove the test pieces respectively.