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[問題求助] IEC 61156-5 為什么找不到NEXT標準公式?

P:2012-10-29 15:01:43

1

如題,只有功率合公式,沒有找到NEXT公式,請問哪里有?

cut-through temperature - 軟化擊穿溫度(漆包線);切通溫度(塑料絕緣護套) (0) 投訴

P:2012-10-29 15:33:04

2

IEC 61156-1有,NEXT=10LOG10(P1N/P2N),知道公式,也沒有太多實際作用

aquablock - (縱向密封電纜用)阻流塊 (0) 投訴

P:2012-10-31 09:06:06

3

原文如下:

The worst pair power sum near-end crosstalk, PS NEXT, at all frequencies, f, in the frequency range indicated inTable 6 shall not be less than the value abtained from Equation (6) useing

                 PS NEXT(f)=PS NEXT(1)-15*log10(f)     (6)

For those frequencies where the calculated value of  PS NEXT is greater than 75 dB,the requirement shall be 75 dB.

The minimum pair-to-pair NEXT for any pair combination shall be at least 3 dB better than the PS NEXT for any pair.

QCM - quality control manual質量控制手冊 (0) 投訴

3


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