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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。
b/ d4 M( ^/ k$ ~- v1 p. |4.2.3 Apparatus+ R$ q' \( t- p
e) a dial micrometer having a 6.3 to 6.4 mm (0.248 to 0.252 in) diameter flat presser foot
8 `; C6 p7 ?, g0 |exerting a total force of 0.83 ±0.03 N (3.0 ±0.1 ozf) on a rectangular anvil measuring
( U& Z, T) m( d+ H- n t4 tapproximately 9 x 2 mm (0.35 x 0.08 in). The face of the anvil on the minor dimension shall be
$ a1 _1 A1 B; A: zslightly convex. Alternatively, these measurements shall be made with a dead-weight dial
& ^9 T4 e6 P; i' y! r7 k0 ]+ B1 I: Emicrometer having a presser foot 6.4 ±0.2 mm (0.248 ±0.010 in) in diameter and exerting a total; n* x9 A" j# O& ?$ Q2 T0 f
of 85 ±3 gf or 0.83 ±0.03 N (3.0 ±0.1 ozf) on the specimen – the load being applied by means( D, [+ g& s0 u5 M; I2 W: F% c% J
of a weight. The presser foot shall be at least 2 mm (0.08 in) onto the edge of the specimen for' M, y* X; [7 R' Z3 n( T
each measurement. Micrometers shall have a resolution and accuracy of 0.01 mm (0.001 in); |
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