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。+ @ S: P# a7 w) [
H.8.1.10 ACCESSIBLE PARTS shall not be considered as HAZARDOUS LIVE PARTS if separated from the supply by PROTECTIVE IMPEDANCE. 6 r- G. v" T, `1 J* n# D: QH.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;2 Q: \5 y8 m* M0 z$ g r
– 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);6 t% O4 ?' V" E
– for voltages over 42,4 V (peak value) and up to and including 450 V (peak value), the capacitance shall / T& Q) i5 I; _& {not exceed 0,1 μF; 6 `3 @& H( n* ^4 C' ? L8 d9 Z+ V– 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; 6 b) Q: `) ~; C5 A– 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.' q& k( P2 U- V* ^+ e; Y/ |/ `2 E
Compliance is checked by measurement. 8 }. B: p- K/ v ]; z: m2 cVoltages and currents are measured between a single ACCESSIBLE PART (or any combination of such parts)' w6 J& |' W! o. M
and the protective earth conductor. Measurements shall be taken in normal supply configuration, and with 2 J C$ c' H4 v% ^& y. e! z" rsupply poles interchanged.' l0 F! x8 O1 y7 q- ]" K- w! K- V
The measuring circuit shall have a total impedance of (1 750 ± 250) W and be shunted by a capacitor such& ~2 m' b5 c* v( U; G
that the time constant of the circuit is (225 ± 15) μs. % F/ K# V3 G4 d& Z, }* @Details of a suitable measuring circuit are shown in Figure E.1. R4 v5 E9 d% \4 v; b @- z
The measuring circuit shall have an accuracy of within 5 % for all frequencies in the range of 20 Hz to 5 / R* G4 ~: E, u1 t5 X( s2 o) J: BkHz. For frequencies above 5 kHz, alternative methods of measurement are required.作者: passagere 时间: 2021-8-13 10:12 本帖最后由 passagere 于 2021-8-13 10:16 编辑 - l! M7 A7 z0 d( `; ]1 B x4 W* B$ W, a3 x与之相关度高的字句如下： ; r0 W) C4 Y3 x1 g5 v6 U7 y0 r! E! X& e5 V3 y1 j, V4 A* m0 g b
0 w1 {. u$ y- R: M2 h6 aDetails 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： 5 ~3 g0 `7 j" u5 A; s# tA suitable circuit (见插图上方文字描述的起始处)。: A4 W2 r1 L; Y/ u; n% J