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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。
( S% A! H6 Z" k4.2.3 Apparatus
# R' t4 J7 @7 E9 v" J7 `5 b3 Te) a dial micrometer having a 6.3 to 6.4 mm (0.248 to 0.252 in) diameter flat presser foot$ Y3 Z) C. m* A* T2 `+ A; p8 [
exerting a total force of 0.83 ±0.03 N (3.0 ±0.1 ozf) on a rectangular anvil measuring
/ b7 P2 s$ \1 m; H. n9 Mapproximately 9 x 2 mm (0.35 x 0.08 in). The face of the anvil on the minor dimension shall be
$ Z) f6 A$ ]# |" @7 b3 n% hslightly convex. Alternatively, these measurements shall be made with a dead-weight dial8 }: c2 k2 V4 u. C) e1 R1 `$ e( r3 K
micrometer having a presser foot 6.4 ±0.2 mm (0.248 ±0.010 in) in diameter and exerting a total9 h/ Y% G6 W1 h( t
of 85 ±3 gf or 0.83 ±0.03 N (3.0 ±0.1 ozf) on the specimen – the load being applied by means. ?, h1 G3 a! `6 L' \6 f
of a weight. The presser foot shall be at least 2 mm (0.08 in) onto the edge of the specimen for9 @" u' d9 i) U' O, w
each measurement. Micrometers shall have a resolution and accuracy of 0.01 mm (0.001 in); |
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