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因电源电网不正常断电或电网换相等原因,使电源突然切断又迅速送电,致使电子设备受损。在关电瞬间整个电网上的负载不稳,电网电压总会有很大的变化,这种变化会使B超仪内部的直流电源产生瞬时的超压或欠压,瞬态超压部分会达到额定值的50％,甚至更大,这瞬变的超压,尽管时间很短,有时足以造成某些集成器件的损坏,更常见的是B超仪再送电后,不能正常工作,电脑不能自行进入初始状态,监视器表现无图象或杂乱的符号及纵横线条。
Due to the power grid is not normal power or network for the same reason, so that the power suddenly cut off and quickly power transmission, resulting in damage to electronic equipment. In the instantaneous power off the load on the entire grid instability, there will always be a great change in grid voltage, this change will make the B-meter internal DC power supply instantaneous overpressure or undervoltage, transient overpressure will reach Rated at 50% or more, the transient overpressure, although the time is very short, sometimes enough to cause damage to some integrated devices, more common is B-meter after power transmission, can not work properly, the computer can not be their own Into the initial state, the monitor displays no image or messy symbols and vertical lines.