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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。9 K1 |2 }1 E9 I7 H
4.2.3 Apparatus' O- B) {( G" f4 k* m4 r
e) a dial micrometer having a 6.3 to 6.4 mm (0.248 to 0.252 in) diameter flat presser foot0 U( M$ [8 V1 K) w
exerting a total force of 0.83 ±0.03 N (3.0 ±0.1 ozf) on a rectangular anvil measuring/ \6 A& h5 r' t. I i8 ^
approximately 9 x 2 mm (0.35 x 0.08 in). The face of the anvil on the minor dimension shall be
; K; s2 W& M2 w4 r& mslightly convex. Alternatively, these measurements shall be made with a dead-weight dial( V8 U& M8 n4 e5 }! v) O
micrometer having a presser foot 6.4 ±0.2 mm (0.248 ±0.010 in) in diameter and exerting a total1 a) ?: Z5 B; S+ ^
of 85 ±3 gf or 0.83 ±0.03 N (3.0 ±0.1 ozf) on the specimen – the load being applied by means
7 q1 V) w# u, Dof a weight. The presser foot shall be at least 2 mm (0.08 in) onto the edge of the specimen for
6 k$ Y1 k. q* Q" e6 ^each measurement. Micrometers shall have a resolution and accuracy of 0.01 mm (0.001 in); |
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