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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。+ z+ h# G, j$ U7 U
4.2.3 Apparatus/ \. \- k# J3 G# X% ?# O$ i
e) a dial micrometer having a 6.3 to 6.4 mm (0.248 to 0.252 in) diameter flat presser foot
; R: ^9 w% r4 R7 ?; R# ^' vexerting a total force of 0.83 ±0.03 N (3.0 ±0.1 ozf) on a rectangular anvil measuring
5 d, g2 s9 ~" Q1 W( Wapproximately 9 x 2 mm (0.35 x 0.08 in). The face of the anvil on the minor dimension shall be' \/ {* _" _: F; c
slightly convex. Alternatively, these measurements shall be made with a dead-weight dial( }# c3 ^# Y7 m" K
micrometer having a presser foot 6.4 ±0.2 mm (0.248 ±0.010 in) in diameter and exerting a total
v5 O' g7 ?1 k6 o: o- [% V! g1 ^of 85 ±3 gf or 0.83 ±0.03 N (3.0 ±0.1 ozf) on the specimen – the load being applied by means
! Z9 ^9 ` W6 N. W' l/ Jof a weight. The presser foot shall be at least 2 mm (0.08 in) onto the edge of the specimen for
# C' p+ a2 L7 ]+ W1 L+ V3 X" oeach measurement. Micrometers shall have a resolution and accuracy of 0.01 mm (0.001 in); |
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