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本帖最后由 CHENGFEGO 于 2013-12-19 16:09 编辑 7 O! x# }, @" S' j5 U" T( U
lengchuan000 发表于 2013-12-19 15:48 % M; d% o. \6 ^
请教一下UL什么要求
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4 o0 [4 ~2 j) }5 Wa dial micrometer having a 6.3 to 6.4 mm (0.248 to 0.252 in) diameter flat presser foot
! F# S6 G: `1 F) w+ X8 oexerting a total force of 0.83 ±0.03 N (3.0 ±0.1 ozf) on a rectangular anvil measuring# W8 q2 H1 f$ T
approximately 9 x 2 mm (0.35 x 0.08 in). The face of the anvil on the minor dimension shall be) i) H6 e) m4 E" ?4 w
slightly convex. Alternatively, these measurements shall be made with a dead-weight dial0 C$ c5 b6 M& j# O8 d$ \
micrometer having a presser foot 6.4 ±0.2 mm (0.248 ±0.010 in) in diameter and exerting a total
% p+ w7 D; ]: Y5 H, O7 }; ~of 85 ±3 gf or 0.83 ±0.03 N (3.0 ±0.1 ozf) on the specimen – the load being applied by means8 W3 D0 F: C# M |; ~: a8 e
of a weight. The presser foot shall be at least 2 mm (0.08 in) onto the edge of the specimen for2 i# ]8 U3 v- j- v! `
each measurement. Micrometers shall have a resolution and accuracy of 0.01 mm (0.001 in);
( R) |/ G+ P) E3 j& v) wf) a micrometer with a resolution and accuracy of 0.001 mm (0.0001 in);
" d5 @1 |) E' [& A8 @( @$ z7 I就是UL用來測量啞鈴片厚度的,$ I' I, P( e3 n5 V* z/ C
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