求教大神UL60730-1中H.8.1.10.1以下蓝色highlight部分？

jansle_happy

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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？
; J+ G- t. p( e. w: h: a' q- g8 e

passagere

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。

jansle_happy

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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。
; x; c5 ^2 M, o0 p  X* G& @H.8.1.10 ACCESSIBLE PARTS shall not be considered as HAZARDOUS LIVE PARTS if separated from the supply by PROTECTIVE IMPEDANCE.
3 L5 B$ U8 q5 H" s* aH.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);
# O1 C' }$ P1 Q– 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.
& p5 j& g5 o# Q  y& q" |Compliance is checked by measurement.
( N" [; E8 P/ B; x# r' l1 EVoltages and currents are measured between a single ACCESSIBLE PART (or any combination of such parts)
- ^+ ^/ u" L* z" m% ^and the protective earth conductor. Measurements shall be taken in normal supply configuration, and with
supply poles interchanged.
2 y: S3 \# X, w* e( ]2 c8 rThe measuring circuit shall have a total impedance of (1 750 ± 250) W and be shunted by a capacitor such
5 G: g5 X' Y! \( h7 A: a* Cthat the time constant of the circuit is (225 ± 15) μs.
# |* N9 P  N* z, bDetails 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
9 ^# q9 _0 ~8 ^7 D: ?4 U* s+ wkHz. For frequencies above 5 kHz, alternative methods of measurement are required.

passagere

与之相关度高的字句如下：
" D, r. Z% |  ^& N5 D' l

' n0 o3 F  q& N% dDetails 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：
( O! }1 `  y8 j: S! VA suitable circuit (见插图上方文字描述的起始处)。

3 a. I6 j7 m4 O! I" s2 R# ?# h) A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
$ B+ U$ W, a7 M$ v给出了电路例子。
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这是我的理解，不尽然正确。
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jansle_happy

passagere 发表于 2021-8-13 10:12
- k" Y2 U- A  f. x" g5 }  a4 R与之相关度高的字句如下：

感谢大神分享

passagere

jansle_happy 发表于 2021-8-16 10:34
感谢大神分享

/ j" O2 f! b7 W6 ]你的帖子比我多多了，安规方面我也有缺点的，不是大神