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本帖最后由 CHENGFEGO 于 2013-12-19 16:09 编辑
! {, J! E( \. A% _' i! A# Zlengchuan000 发表于 2013-12-19 15:48 $ |. }/ [. {. b& _8 a9 e1 p
请教一下UL什么要求
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a dial micrometer having a 6.3 to 6.4 mm (0.248 to 0.252 in) diameter flat presser foot3 t8 I' M T' B; K: Z: K3 ?
exerting a total force of 0.83 ±0.03 N (3.0 ±0.1 ozf) on a rectangular anvil measuring( G5 t7 M4 T: ]
approximately 9 x 2 mm (0.35 x 0.08 in). The face of the anvil on the minor dimension shall be
/ i: [' g& d; _slightly convex. Alternatively, these measurements shall be made with a dead-weight dial
; {% _$ u6 Y3 ~1 R$ Tmicrometer having a presser foot 6.4 ±0.2 mm (0.248 ±0.010 in) in diameter and exerting a total: d L: e, f( s/ |
of 85 ±3 gf or 0.83 ±0.03 N (3.0 ±0.1 ozf) on the specimen – the load being applied by means
% m9 x8 b- u2 R ? T/ Hof a weight. The presser foot shall be at least 2 mm (0.08 in) onto the edge of the specimen for
9 c ]0 l& ~3 Teach measurement. Micrometers shall have a resolution and accuracy of 0.01 mm (0.001 in);; U8 n# Y+ @( I) P! F
f) a micrometer with a resolution and accuracy of 0.001 mm (0.0001 in);
% U- d3 j f- Q$ _就是UL用來測量啞鈴片厚度的,4 l8 B) X) b: z
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