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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。
* m6 F: }) d9 q! F: s7 p# j! Z8 c4.2.3 Apparatus
$ d4 }5 Y1 {* o- Q3 c1 Oe) a dial micrometer having a 6.3 to 6.4 mm (0.248 to 0.252 in) diameter flat presser foot8 ^7 a- b8 ~# B* c2 w7 Q9 ]% `
exerting a total force of 0.83 ±0.03 N (3.0 ±0.1 ozf) on a rectangular anvil measuring1 v1 A$ G; k% V8 ^8 a% t
approximately 9 x 2 mm (0.35 x 0.08 in). The face of the anvil on the minor dimension shall be
% q8 c! s- D; H, p9 X$ i1 i4 F$ kslightly convex. Alternatively, these measurements shall be made with a dead-weight dial" n9 W0 D5 @6 w1 I& G+ U" ^
micrometer having a presser foot 6.4 ±0.2 mm (0.248 ±0.010 in) in diameter and exerting a total
8 ? c2 Q2 k* M: L4 Z1 \; i( pof 85 ±3 gf or 0.83 ±0.03 N (3.0 ±0.1 ozf) on the specimen – the load being applied by means
5 `* Q2 E; J$ k3 n9 i: tof a weight. The presser foot shall be at least 2 mm (0.08 in) onto the edge of the specimen for+ ^) z5 f! t# R! i) N, C
each measurement. Micrometers shall have a resolution and accuracy of 0.01 mm (0.001 in); |
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