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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。; ^1 k: ^; W; t
4.2.3 Apparatus
: N! j8 H/ Q( M ]2 V. oe) a dial micrometer having a 6.3 to 6.4 mm (0.248 to 0.252 in) diameter flat presser foot( E) @: }% Q& t8 [$ p; f% H
exerting a total force of 0.83 ±0.03 N (3.0 ±0.1 ozf) on a rectangular anvil measuring
5 R) {; p7 O" x8 X9 j3 S8 I! ]approximately 9 x 2 mm (0.35 x 0.08 in). The face of the anvil on the minor dimension shall be" {' g! |5 C m% I/ v5 b6 F! y6 {
slightly convex. Alternatively, these measurements shall be made with a dead-weight dial
4 L' \+ D3 q& Z: R5 A5 X" Amicrometer having a presser foot 6.4 ±0.2 mm (0.248 ±0.010 in) in diameter and exerting a total, b. j" z$ t+ d8 j0 n2 Y
of 85 ±3 gf or 0.83 ±0.03 N (3.0 ±0.1 ozf) on the specimen – the load being applied by means7 y/ u; w" ]" Z# L
of a weight. The presser foot shall be at least 2 mm (0.08 in) onto the edge of the specimen for% x5 M$ x& v: s1 w- v
each measurement. Micrometers shall have a resolution and accuracy of 0.01 mm (0.001 in); |
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