求教大神UL60730-1中H.8.1.10.1以下蓝色highlight部分？
求教大神UL60730-1中H.8.1.10.1以下蓝色highlight部分？不是参照figure E.1测试么，测试网络的电阻不是RS:1500Ω； RB:500Ω; R1:10000Ω么，另外这里所说的time constant of the circuit 是指什么？首先所示的电路图是根据该条款而设计的一条合适的测试电路。其实标准里并不是要求一定按照所示电路图去做测试电路，它只是一个例子。time constant of the circuit -- 电路的时间常数，请百度一下哈。 本帖最后由 jansle_happy 于 2021-8-13 10:09 编辑
passagere 发表于 2021-8-12 19:20
首先所示的电路图是根据该条款而设计的一条合适的测试电路。其实标准里并不是要求一定按照所示电路图去做测 ...大神看起来，应该不是说figure E只是个列子吧，看起来原文是前面描述了测试电路的特性，然后给出具体的图书如图E啊。
H.8.1.10 ACCESSIBLE PARTS shall not be considered as HAZARDOUS LIVE PARTS if separated from the supply by PROTECTIVE IMPEDANCE.
H.8.1.10.1 When PROTECTIVE IMPEDANCE is used, the current between the part or parts and either pole of the supply source shall not exceed 0,7 mA (peak value) a.c. or 2 mA d.c;
– for frequencies exceeding 1 kHz, the limit of 0,7 mA (peak value) is multiplied by the value of the frequency in kHz but shall not exceed 70 mA (peak value);
– for voltages over 42,4 V (peak value) and up to and including 450 V (peak value), the capacitance shall
not exceed 0,1 μF;
– for voltages over 450 V (peak value) and up to and including 15 kV (peak value), the product of the capacitance in farads times the potential in volts shall not exceed 45 μC;
– for voltages over 15 kV (peak value), the product of the capacitance in farads times the square of the potential in volts shall not exceed 350 mJ.
Compliance is checked by measurement.
Voltages and currents are measured between a single ACCESSIBLE PART (or any combination of such parts)
and the protective earth conductor. Measurements shall be taken in normal supply configuration, and with
supply poles interchanged.
The measuring circuit shall have a total impedance of (1 750 ± 250) W and be shunted by a capacitor such
that the time constant of the circuit is (225 ± 15) μs.
Details of a suitable measuring circuit are shown in Figure E.1.
The measuring circuit shall have an accuracy of within 5 % for all frequencies in the range of 20 Hz to 5
kHz. For frequencies above 5 kHz, alternative methods of measurement are required. 本帖最后由 passagere 于 2021-8-13 10:16 编辑
与之相关度高的字句如下：
Details of a suitable measuring circuit are shown in Figure E.1此处显示"suitable"则表明此电路是**之一的意思，下句也类似：
A suitable circuit (见插图上方文字描述的起始处)。
标明了阻抗范围，还并联电容。说实话，电路是有等效性的，不同的电路
也一样可以做出这样的效果，于是，它列出了对测试电路的要求，并
给出了电路例子。
这是我的理解，不尽然正确。
passagere 发表于 2021-8-13 10:12
与之相关度高的字句如下：
感谢大神分享 jansle_happy 发表于 2021-8-16 10:34
感谢大神分享
你的帖子比我多多了，安规方面我也有缺点的，不是大神
页:
[1]
