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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。* P# B: C, F+ G2 P; x2 O( i, N
4.2.3 Apparatus, J/ |% G& ^) d# f: D
e) a dial micrometer having a 6.3 to 6.4 mm (0.248 to 0.252 in) diameter flat presser foot @% g/ n6 I' f1 H
exerting a total force of 0.83 ±0.03 N (3.0 ±0.1 ozf) on a rectangular anvil measuring
) R2 h6 Q2 v. x! A0 D1 lapproximately 9 x 2 mm (0.35 x 0.08 in). The face of the anvil on the minor dimension shall be
& L/ v5 ^& K( zslightly convex. Alternatively, these measurements shall be made with a dead-weight dial8 J. p! q, x) L3 N$ |
micrometer having a presser foot 6.4 ±0.2 mm (0.248 ±0.010 in) in diameter and exerting a total7 [, u6 a+ U: v
of 85 ±3 gf or 0.83 ±0.03 N (3.0 ±0.1 ozf) on the specimen – the load being applied by means4 r5 ]5 A6 {; }+ Q$ d
of a weight. The presser foot shall be at least 2 mm (0.08 in) onto the edge of the specimen for
: V, ~4 o: B Heach measurement. Micrometers shall have a resolution and accuracy of 0.01 mm (0.001 in); |
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