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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。: y$ [/ l* M9 p6 u
4.2.3 Apparatus
# l: W* x4 }+ ]# n- {: j, ve) a dial micrometer having a 6.3 to 6.4 mm (0.248 to 0.252 in) diameter flat presser foot" A6 s& A, Y# M% `1 n' x
exerting a total force of 0.83 ±0.03 N (3.0 ±0.1 ozf) on a rectangular anvil measuring6 h: }0 `: G) }8 y% Y- F% X1 w
approximately 9 x 2 mm (0.35 x 0.08 in). The face of the anvil on the minor dimension shall be
7 N, B4 }& Y7 |! x r5 X" A1 r, Cslightly convex. Alternatively, these measurements shall be made with a dead-weight dial
: h' w3 Z. Z+ f! |micrometer having a presser foot 6.4 ±0.2 mm (0.248 ±0.010 in) in diameter and exerting a total0 Q: A4 \! i3 { W5 K$ C
of 85 ±3 gf or 0.83 ±0.03 N (3.0 ±0.1 ozf) on the specimen – the load being applied by means
9 [' S( L$ J6 {. X+ H- A- H" gof a weight. The presser foot shall be at least 2 mm (0.08 in) onto the edge of the specimen for
! b# }4 V, e% X% r9 l8 o6 Q9 s1 leach measurement. Micrometers shall have a resolution and accuracy of 0.01 mm (0.001 in); |
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