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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。
]. x; D4 u$ j) ^8 j4.2.3 Apparatus
, l! D" u9 Z p1 @e) a dial micrometer having a 6.3 to 6.4 mm (0.248 to 0.252 in) diameter flat presser foot8 |" [; `+ J7 [6 y* k$ D' l
exerting a total force of 0.83 ±0.03 N (3.0 ±0.1 ozf) on a rectangular anvil measuring( U. G& |- }1 K
approximately 9 x 2 mm (0.35 x 0.08 in). The face of the anvil on the minor dimension shall be
3 Q% k4 f6 a% ?) X1 L. I6 xslightly convex. Alternatively, these measurements shall be made with a dead-weight dial. F4 r+ ]6 N0 O) }
micrometer having a presser foot 6.4 ±0.2 mm (0.248 ±0.010 in) in diameter and exerting a total
+ P, k/ Q3 _0 W7 b5 ?of 85 ±3 gf or 0.83 ±0.03 N (3.0 ±0.1 ozf) on the specimen – the load being applied by means! N8 A6 O& z' ?# u2 C, _
of a weight. The presser foot shall be at least 2 mm (0.08 in) onto the edge of the specimen for% s) N2 z$ h' I+ V- }; |! P$ I
each measurement. Micrometers shall have a resolution and accuracy of 0.01 mm (0.001 in); |
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