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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。
3 v, f6 o) G. V0 n" z4.2.3 Apparatus5 S: X) M% E4 R' X/ ~
e) a dial micrometer having a 6.3 to 6.4 mm (0.248 to 0.252 in) diameter flat presser foot+ n8 I: L7 F, _ z' P
exerting a total force of 0.83 ±0.03 N (3.0 ±0.1 ozf) on a rectangular anvil measuring9 ~7 I; Z4 D# k
approximately 9 x 2 mm (0.35 x 0.08 in). The face of the anvil on the minor dimension shall be
: t3 U0 z. f: E" @2 ^' ~9 Xslightly convex. Alternatively, these measurements shall be made with a dead-weight dial. b5 L7 b" e( H! F- s: A, g# r
micrometer having a presser foot 6.4 ±0.2 mm (0.248 ±0.010 in) in diameter and exerting a total3 u6 z- n: I2 m# _: q
of 85 ±3 gf or 0.83 ±0.03 N (3.0 ±0.1 ozf) on the specimen – the load being applied by means9 f( M# e0 M9 o/ n4 T6 N0 r: I d
of a weight. The presser foot shall be at least 2 mm (0.08 in) onto the edge of the specimen for& w/ Q7 S. d# \% n0 o
each measurement. Micrometers shall have a resolution and accuracy of 0.01 mm (0.001 in); |
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