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对于第一个问题在EN55022:2006说的很详细：8 X2 P6 c- p% j
1) The test is performed with a vertical ground reference plane. The EUT shall be placed on
* U# N& U+ p" a$ q, B) X: B( c2 o- c/ O3 @a non-conductive table such that it is 0,8 m above the horizontal ground reference plane., d0 ?% g- c& ^6 H$ a# k B% T
The rear of the EUT shall be 0,4 m from the vertical ground reference plane. The vertical
9 d. ]+ B, Q g6 M0 |7 Kground reference plane shall be bonded to the horizontal ground reference plane. Hence
; F! k0 O) r/ q/ ~5 z% cthe AMN(s) and ISN(s) used can be bonded to either the vertical ground reference plane
9 z& e+ X) z; G, Lor other metal planes regarded as the ground reference plane. Example arrangements are% e& T( I! w# j& z! S& [/ y% X
shown in }Figure 4,~ Figure 5 (alternative 1a) and Figure 6 (alternative 1b).
" |' z+ w2 B+ d3 z$ P! `2) The test is performed with a horizontal ground reference plane (for example on an open
4 t3 [# S' J4 w+ R, carea test site (OATS) or in a screened enclosure). The EUT shall be placed on a nonconductive/ n2 _$ \% z7 S) |, M# U, l' V/ X* C
table such that it is 0,4 m above the horizontal ground reference plane. An
5 H# {8 D w8 E; D# g" texample arrangement is shown in Figure 7.$ ?1 ]/ g3 I$ L d* T0 s
再来看EN55011:2007也说的很明确3 p: u( p- T. O# v
Option a) shall be used where the test site contains a metal ground plane. In options b) and
/ `- A" i" A. M1 x- m: \c) the test unit, if non-floor-standing, shall be placed 0,4 m from the ground plane. Floorstanding
' L8 ~5 N% a% M2 E/ g; i L$ q; `test units shall be placed on the ground plane, the point(s) of contact being
+ n$ J! O! n. X' j0 _; \* einsulated from the ground plane but otherwise consistent with normal use. All test units shall, q7 y1 C3 o$ v9 W+ s6 e
be at least 0,8 m from any other metal surface.. }4 L4 U. l& i/ C( V$ B5 r7 U& I) Y
对于第2个问题：2 O s( Y( z. }' _' z/ i
由于EN标准中没有具体的说明Power Supply是什么，所以AC,DC都要测试传导，而FCC part15关于传导，ClassB设备的说明(a) Except for Class A digital devices, for equipment that is designed to be connected to the public utility (AC) power line, the radio frequency voltage that is conducted back onto the AC power line on any frequency or frequencies within the band 150 kHz to 30 MHz shall not exceed the limits in the following table, as measured using a 50 μH/50 ohms line impedance stabilization network (LISN).也就是说只要不与公共电网相连的设备，就排除在外，即不考虑传导 |
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发表于 2009-1-6 17:54
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