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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。( t/ j$ D# y6 f
4.2.3 Apparatus* @$ e- Y: \2 ^! i/ O- ^; @# R
e) a dial micrometer having a 6.3 to 6.4 mm (0.248 to 0.252 in) diameter flat presser foot
& t2 l0 p) r' V1 y9 A. E6 Bexerting a total force of 0.83 ±0.03 N (3.0 ±0.1 ozf) on a rectangular anvil measuring
& i8 N% O7 F% [9 I) I* L9 c9 k7 B& @approximately 9 x 2 mm (0.35 x 0.08 in). The face of the anvil on the minor dimension shall be
. t- t0 U$ I) dslightly convex. Alternatively, these measurements shall be made with a dead-weight dial
" b+ X: E2 D+ Z T0 S2 N7 @) xmicrometer having a presser foot 6.4 ±0.2 mm (0.248 ±0.010 in) in diameter and exerting a total1 s5 l, V3 f2 J9 Y! X! D
of 85 ±3 gf or 0.83 ±0.03 N (3.0 ±0.1 ozf) on the specimen – the load being applied by means4 K1 |4 ^3 @: P
of a weight. The presser foot shall be at least 2 mm (0.08 in) onto the edge of the specimen for* J; {: A8 d( A1 X5 x2 Z4 d; }
each measurement. Micrometers shall have a resolution and accuracy of 0.01 mm (0.001 in); |
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