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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 O5 ^& a! b+ p' c2 `- Q4.2.3 Apparatus4 |1 u5 s5 b+ ]" v- M- Y" Q1 c8 Q
e) a dial micrometer having a 6.3 to 6.4 mm (0.248 to 0.252 in) diameter flat presser foot) E1 Q" a- s7 W$ Y/ f- a# A
exerting a total force of 0.83 ±0.03 N (3.0 ±0.1 ozf) on a rectangular anvil measuring) G6 Q! Q' b# z1 x
approximately 9 x 2 mm (0.35 x 0.08 in). The face of the anvil on the minor dimension shall be
( l+ H1 _, Z" g2 p ^, vslightly convex. Alternatively, these measurements shall be made with a dead-weight dial E: k; y% ] q3 p9 E( [
micrometer having a presser foot 6.4 ±0.2 mm (0.248 ±0.010 in) in diameter and exerting a total
1 a6 L# }" b, R% F6 W- R- ~! `6 Mof 85 ±3 gf or 0.83 ±0.03 N (3.0 ±0.1 ozf) on the specimen – the load being applied by means
# `0 @9 o: n; V" S' oof a weight. The presser foot shall be at least 2 mm (0.08 in) onto the edge of the specimen for* n8 G' u' J3 H; J
each measurement. Micrometers shall have a resolution and accuracy of 0.01 mm (0.001 in); |
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