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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。
, F' L) {) q! g" x& C; D4.2.3 Apparatus% a% Q0 e9 G6 s8 g# H
e) a dial micrometer having a 6.3 to 6.4 mm (0.248 to 0.252 in) diameter flat presser foot' Y5 H1 c9 U0 j
exerting a total force of 0.83 ±0.03 N (3.0 ±0.1 ozf) on a rectangular anvil measuring9 y/ Y+ r: ^ Y! o! q5 `
approximately 9 x 2 mm (0.35 x 0.08 in). The face of the anvil on the minor dimension shall be
C5 G/ P( Z; w* w8 Pslightly convex. Alternatively, these measurements shall be made with a dead-weight dial! _0 ?: |& Q5 o; e1 S1 [
micrometer having a presser foot 6.4 ±0.2 mm (0.248 ±0.010 in) in diameter and exerting a total
9 J5 T# C V; Tof 85 ±3 gf or 0.83 ±0.03 N (3.0 ±0.1 ozf) on the specimen – the load being applied by means
" D. `0 F" o$ y/ l4 Wof a weight. The presser foot shall be at least 2 mm (0.08 in) onto the edge of the specimen for
$ Y5 y3 N! _2 I* r: Deach measurement. Micrometers shall have a resolution and accuracy of 0.01 mm (0.001 in); |
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