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新来的实验员小张在修理一台损坏的低压电源时,手无意中碰了一下低压电源的外壳,“哎呀!怎么有电?这还了得.”小张拿出多用表,想量量漏电电压值有多少?谁知这一量,竟量出问题来了.小张首先将多用表打到交流1000 V 挡,测量低压电源外壳对地电压为157 V.换成交流250 V 挡再测,结果低压电源外壳对地电压变成85 V.这是怎么回事?小张一生气干脆换成交流50 V 挡,测量结果竟然变成了24 V.小张又用交流10 V 挡量了一次,结果对地电压又变为5 V.不同的四个挡,量出了4
When the new laboratory technician Xiao Zhang repaired a damaged low-voltage power supply, he touched the shell of the low-voltage power supply inadvertently. “Oh, how can there be electricity? It’s too good.” Xiao Zhang took out the multimeter, How much do you want to measure the amount of leakage voltage? Who knows how much this amount of voltage is? The problem has been solved. Xiao Zhang first used the multimeter to switch to an AC 1000 V block and measured the voltage of the low-voltage power supply to 157 V. AC 250 V block and then test, the result of low-voltage power supply shell voltage to ground becomes 85 V. This is how is it? Xiao Zhang an angry simply replaced by AC 50 V block, the measurement turned out to be 24 V. Xiao Zhang also used AC 10 Once the V gear is blocked, the voltage on the ground changes to 5 V. The four different gears measure 4