AT420 Series Digital Pendulum Impact Tester is used to determine the impact toughness of non-metallic materials such as rigid plastics, reinforced nylon, glass reinforced plastics, ceramics, cast stone, electrical insulating materials, etc. This instrument complies with the following international and industry standards. ISO: ISO 179. ASTM: ASTM D256. GB/T: GB/T 1843, JB/T 8761. The innovative design allows this tester to be used for both Izod and Charpy tests. Digital type, PLC touch screen control and display. Unique and innovative design: vice and pendulum allow the operator to run alternative Charpy and Izod tests without changing the instrument geometry. Impact speeds of 3.8m/s and 3.5m/s as well as multiple impact energies can be generated by one pendulum. High mass, traditional pendulum design concentrates energy at the impact point with minimal energy loss due to vibration. The electrics contain a high-resolution encoder for accurate measurement of the impact angle. Touch screen control for quick and easy input of parameters, interactive software allows for users' input regarding complete, partial hinge broken and non-broken samples. Tester connected to PC through RS232 interface for direct data acquisition. Test data can be saved or exported using the included software package. Results are automatically corrected for energy loss due to air and mechanical friction. Multiple safety protections ensure the operation safety of operators. Smart dimension measuring device is introduced to HY4254D series impact tester; width, thickness as well as residual thickness of test sample can be exported to touch screen directly. Test result will be calculated automatically. Technical Specification Model: AT420A, AT420B Impact velocity: 2.9m/s, 3.5m/s Impact energy: Izod: 1J, 2.75J, 5.5J; 5.5J, 11J, 22J Charpy: 0.5J, 1J, 2J, 4J, 5J; 7.5J, 15J, 25J, 50J Angle of Striking edge: 30° ± 1° (Charpy) Resolution: 0.01J Distance between striking edge and top surface of jaw: 22.0mm±0.2mm (Izod) Corner radius of striking edge: Izod: R=0.8mm±0.2mm; Charpy: 2mm±0.5mm Power supply: AC220V, 50Hz Dimensions: 930×350×990mm Weight: 90kg