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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。# h0 j# D- U& C3 n! ~
4.2.3 Apparatus
' n# x5 H' i; L2 {. J% a" S& F* we) a dial micrometer having a 6.3 to 6.4 mm (0.248 to 0.252 in) diameter flat presser foot$ Y" a5 ~: y7 u( }9 J4 [1 u
exerting a total force of 0.83 ±0.03 N (3.0 ±0.1 ozf) on a rectangular anvil measuring
6 L) r& U7 \! S; [* f: V( K+ Xapproximately 9 x 2 mm (0.35 x 0.08 in). The face of the anvil on the minor dimension shall be
+ A- R7 X3 i3 C* o6 `) Lslightly convex. Alternatively, these measurements shall be made with a dead-weight dial1 C% V' y( S$ k' k- w& K; X
micrometer having a presser foot 6.4 ±0.2 mm (0.248 ±0.010 in) in diameter and exerting a total, |# T+ p" Q/ j) 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% g2 X6 e- W5 {$ N
of a weight. The presser foot shall be at least 2 mm (0.08 in) onto the edge of the specimen for9 Z! v1 B" k: D6 H: A/ y
each measurement. Micrometers shall have a resolution and accuracy of 0.01 mm (0.001 in); |
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