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Appliances are deemed to comply in the frequency range from 300 MHz to 1 000 MHz if+ V6 j a( B: V# M) g* | t
both of the following conditions ( 1) and 2)) are fulfilled:# M' @+ v% b% e. J
1) all emission readings from the equipment under test shall be lower than the applicable! r4 }- E7 D9 F+ }
limits (Table 2a) reduced by the margin (Table 2b);4 n2 u' F# j3 ?1 g
2) the maximum clock frequency shall be less than 30 MHz.
3 i/ x( y% ^5 {8 V- ?; Y) bIf either of condition 1) or 2) is not fulfilled, radiated measurements in the frequency range
( O( i1 K5 Q$ E8 `9 i/ n% Gfrom 300 MHz to 1 000 MHz shall be conducted and the limits of Table 3 for that range
0 a/ z% E- S$ \- Y7 v: mapplied. In any case the limits of Table 2a in the frequency range 30 MHz to 300 MHz
}, |' _& G9 t3 K* J6 {shall be met. o5 a1 a/ S% |5 l+ O1 `0 `: a4 p4 Q
Table 2b Margin when performing disturbance power measurement in the frequency range 30 MHz to 300 MHz6 v* N2 L( M' g* @( [
Frequency range Quasi-peak dB (pW)
E s& x) f+ V; e, S. j4 m200 to 300 0 to 10 dB -
7 R) J6 l. n5 `0 l: I0 L当功率骚扰(DP)200到300MHzQP余量小于10dB时,辐射(RE)是需要测试的。参见CISPR14-1 2009 |
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