本机测试插头线在经过一定次数自由跌落后的安全与可靠度。试法是把插头含后端电源线 100mm 处剪断，作为试件，投入滚桶内，依试件重量设定标准所要求之跌落次数，使试件连续落下撞击，到达设定次数后，本机自动停机，然后取出试件检查受损程度。Cut off the cord with 100mm behind plug as being a test specimen。Put it into Tumbling barrel，then preset the tumbling numbers according to the weight of test specimen。Check the damaged degree of the test specimen ( which is subject to the above successive dropsimpacts ) after the preset numbers are reached。 滚动速度 Tumbling speed  5r.p.m ( 即每分钟跌落 10 次 ) 计 数 器 Counter  电子式，6 位数，到达设定次数自动停机  Electronic type 6 digits，auto-stop during  the preset numbers are reached 电源          Power  AC220V / 50Hz