- 积分
- 33149
- 兑换点
- 点
- 声望度
-
- 金钱
- 元
- 银行存款
- 元
- 贡献度
-
- 精华
|
发表于 2010-9-10 10:58:45
|
显示全部楼层
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. |
|