v498115197 发表于 2010-9-9 09:40:02

阿咪打鬼子 发表于 2010-9-9 19:25:56

IEC950规定基材的三个CTI等级:

1. 1级:CTI>=600V;

2.2级:400V<=CTI<600V;

3.3级:175V<=CTI<400V;

等级越小,说明它的耐漏电痕迹性越高。

cszwj 发表于 2010-9-10 10:58:45

6.        Comparative Tracking Index (CTI) – The CTI is expressed as that voltage, which causes tracking on a printed wiring board base material after 50 drops of 0.1 percent ammonium chloride solution has fallen.Results of testing the nominal 3 mm (1/8 in.) thickness are considered representative of the material’s performance in any thickness. Boards shall be assigned a performance level category (PLC) for CTI based on the PLC assigned to the base material.Flame Only boards are not evaluated to determine CTI.


CTI Range Tracking Index (TI in Volts)        Assigned PLC
600 and greater                                                 0
400 and up to 600                                              1
250 and up to 400                                              2
175 and up to 250                                              3
100 and up to 175                                              4
Less than 100                                                     5


        For CNR, the actual CTI values are indicated in Table II.

lwhgood 发表于 2010-9-11 13:56:08

caify 发表于 2010-10-24 15:25:51

目前的板料基本都是CTI 三级,以符合更高的很少了

ji780915 发表于 2011-7-24 13:14:59

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