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关于电线护套的厚度测试,请注意,UL2556里面的要求已经修改。近来检查员在核对这个,搞得工厂不明就里。% R7 [9 N$ P# m6 v$ V( s% ?
4.2.3 Apparatus
8 G/ Y% Y7 U, W' | \e) a dial micrometer having a 6.3 to 6.4 mm (0.248 to 0.252 in) diameter flat presser foot
* {1 H/ Q+ Y4 |" X$ }exerting a total force of 0.83 ±0.03 N (3.0 ±0.1 ozf) on a rectangular anvil measuring
6 |4 {* ^" I/ japproximately 9 x 2 mm (0.35 x 0.08 in). The face of the anvil on the minor dimension shall be
/ w% ?" j$ V% h2 b" M: t) a6 i. a, {% jslightly convex. Alternatively, these measurements shall be made with a dead-weight dial9 I" c& e" c* b
micrometer having a presser foot 6.4 ±0.2 mm (0.248 ±0.010 in) in diameter and exerting a total( j; q5 o+ B$ Z
of 85 ±3 gf or 0.83 ±0.03 N (3.0 ±0.1 ozf) on the specimen – the load being applied by means$ v& k) J. b: Z! o9 T
of a weight. The presser foot shall be at least 2 mm (0.08 in) onto the edge of the specimen for
- e0 G& B1 o6 D' \+ j* b; xeach measurement. Micrometers shall have a resolution and accuracy of 0.01 mm (0.001 in); |
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