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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。
. t4 G) p3 @+ C) H* C3 l4 _4.2.3 Apparatus
- L1 e* e- W0 r5 p$ ]0 _) n0 g. Ae) a dial micrometer having a 6.3 to 6.4 mm (0.248 to 0.252 in) diameter flat presser foot
. o8 z" \, N2 U# `% g5 U9 mexerting a total force of 0.83 ±0.03 N (3.0 ±0.1 ozf) on a rectangular anvil measuring
, d$ t8 x. d9 p* d2 R5 Rapproximately 9 x 2 mm (0.35 x 0.08 in). The face of the anvil on the minor dimension shall be: a2 {& }+ ?' T* J1 t1 p) y
slightly convex. Alternatively, these measurements shall be made with a dead-weight dial" I; b5 v O' o2 x5 M
micrometer having a presser foot 6.4 ±0.2 mm (0.248 ±0.010 in) in diameter and exerting a total+ _ e* S' ?0 d9 n
of 85 ±3 gf or 0.83 ±0.03 N (3.0 ±0.1 ozf) on the specimen – the load being applied by means' K& D8 K3 h2 p5 {& k1 }
of a weight. The presser foot shall be at least 2 mm (0.08 in) onto the edge of the specimen for
1 p& y: e0 w1 ]. Z9 Y( Neach measurement. Micrometers shall have a resolution and accuracy of 0.01 mm (0.001 in); |
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