辛普森228(漏电流测试仪)上的MIU到底换算成mA是多少?
各位大侠请赐教,MIU在说明书上全称是measurement indication units,在shock hazard 那一个量程都是这样的单位,但是不知道这个单位是怎么换算的,换算成mA是多少?查了好多资料都没有找到
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@ivansunfeijian
UL101很难找到阿,能不能帮忙提供一下阿?
3.7 MIU-MEASUREMENT INDICATION UNIT – Is the output voltage (V3) in millivolts rms from the
measurement instrument in Figure 5.3 divided by 500 (the value in ohms of the resistance in parallel
with V2 in the measurement instrument circuit). (The indication is essentially the rms value of a 60 Hz
sinusoidal leakage current in mA. It may not be a direct indication of the rms or other common
amplitude quantifier of leakage current when the leakage current is of complex waveform or frequency
other than 50 or 60 Hz.)
measurement instrument in Figure 5.3 divided by 500 (the value in ohms of the resistance in parallel
with V2 in the measurement instrument circuit). (The indication is essentially the rms value of a 60 Hz
sinusoidal leakage current in mA. It may not be a direct indication of the rms or other common
amplitude quantifier of leakage current when the leakage current is of complex waveform or frequency
other than 50 or 60 Hz.)
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@ccic
简单的说,1MIU=1mA.
从en60990看,实际上U2/500 就是通过人体的电流啊.至于MIU的解释中"the indication is essentially the rms value of a 60Hz sinnusoidal leakage current in mA,it may not be a direct indication of the rms or other common amplitude quantifier of leakage current when the leakage current is of complex waveform or frequency other than 50Hz or 60 Hz",标准的意思是算出来的值实际上是正弦60Hz下mA级漏电流的有效值,但是在除了50Hz和60Hz的频域或复杂波形,这个值就可能不是直接有效值或者常见量,但是辛普森228对于perception,reaction,let go,都有模拟电路阿,在60990中并没有排除一些用已知模拟网络测量不准的情况,我觉得除了50Hz和60Hz的频域或复杂波形之外的波形都可以用此网络测量,即使高频之类的对人体的伤害与50或60Hz不同,但是流过人体的电流不会变化啊,不知道我理解对不对,就是觉得老美故弄玄虚.
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@ivansunfeijian
从en60990看,实际上U2/500就是通过人体的电流啊.至于MIU的解释中"theindicationisessentiallythermsvalueofa60HzsinnusoidalleakagecurrentinmA,itmaynotbeadirectindicationofthermsorothercommonamplitudequantifierofleakagecurrentwhentheleakagecurrentisofcomplexwaveformorfrequencyotherthan50Hzor60Hz",标准的意思是算出来的值实际上是正弦60Hz下mA级漏电流的有效值,但是在除了50Hz和60Hz的频域或复杂波形,这个值就可能不是直接有效值或者常见量,但是辛普森228对于perception,reaction,letgo,都有模拟电路阿,在60990中并没有排除一些用已知模拟网络测量不准的情况,我觉得除了50Hz和60Hz的频域或复杂波形之外的波形都可以用此网络测量,即使高频之类的对人体的伤害与50或60Hz不同,但是流过人体的电流不会变化啊,不知道我理解对不对,就是觉得老美故弄玄虚.
简单的来说就是觉得MIU是个多余的东西.
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