辛普森228(漏電流測試儀)上的MIU到底換算成mA是多少?
各位大俠請賜教,MIU在說明書上全稱是measurement indication units,在shock hazard 那一個量程都是這樣的單位,但是不知道這個單位是怎么換算的,換算成mA是多少?查了好多資料都沒有找到
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@ivansunfeijian
UL101很難找到阿,能不能幫忙提供一下阿?
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
簡單的說,1MIU=1mA.
從en60990看,實際上U2/500 就是通過人體的電流啊.至于MIU的解釋中"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",標準的意思是算出來的值實際上是正弦60Hz下mA級漏電流的有效值,但是在除了50Hz和60Hz的頻域或復雜波形,這個值就可能不是直接有效值或者常見量,但是辛普森228對于perception,reaction,let go,都有模擬電路阿,在60990中并沒有排除一些用已知模擬網絡測量不準的情況,我覺得除了50Hz和60Hz的頻域或復雜波形之外的波形都可以用此網絡測量,即使高頻之類的對人體的傷害與50或60Hz不同,但是流過人體的電流不會變化啊,不知道我理解對不對,就是覺得老美故弄玄虛.
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@ivansunfeijian
從en60990看,實際上U2/500就是通過人體的電流啊.至于MIU的解釋中"theindicationisessentiallythermsvalueofa60HzsinnusoidalleakagecurrentinmA,itmaynotbeadirectindicationofthermsorothercommonamplitudequantifierofleakagecurrentwhentheleakagecurrentisofcomplexwaveformorfrequencyotherthan50Hzor60Hz",標準的意思是算出來的值實際上是正弦60Hz下mA級漏電流的有效值,但是在除了50Hz和60Hz的頻域或復雜波形,這個值就可能不是直接有效值或者常見量,但是辛普森228對于perception,reaction,letgo,都有模擬電路阿,在60990中并沒有排除一些用已知模擬網絡測量不準的情況,我覺得除了50Hz和60Hz的頻域或復雜波形之外的波形都可以用此網絡測量,即使高頻之類的對人體的傷害與50或60Hz不同,但是流過人體的電流不會變化啊,不知道我理解對不對,就是覺得老美故弄玄虛.
簡單的來說就是覺得MIU是個多余的東西.
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