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本帖最后由 CHENGFEGO 于 2013-12-19 16:09 编辑
6 b% @" S) q1 o+ v- K7 |lengchuan000 发表于 2013-12-19 15:48 + b) v2 G7 Y) d: D# l
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 foot, T& C7 l, X- X( p) `" T
exerting a total force of 0.83 ±0.03 N (3.0 ±0.1 ozf) on a rectangular anvil measuring* A$ `; H4 c! ~) d" s! i- e
approximately 9 x 2 mm (0.35 x 0.08 in). The face of the anvil on the minor dimension shall be
% y3 T, a' w0 D* ?' dslightly convex. Alternatively, these measurements shall be made with a dead-weight dial% v0 j2 c9 E( b
micrometer having a presser foot 6.4 ±0.2 mm (0.248 ±0.010 in) in diameter and exerting a total
# N6 J6 ]) `2 eof 85 ±3 gf or 0.83 ±0.03 N (3.0 ±0.1 ozf) on the specimen – the load being applied by means
5 q8 k( w. _6 ]of a weight. The presser foot shall be at least 2 mm (0.08 in) onto the edge of the specimen for9 O' C$ }4 C+ ?- p) c
each measurement. Micrometers shall have a resolution and accuracy of 0.01 mm (0.001 in);1 [. o; M4 m0 C
f) a micrometer with a resolution and accuracy of 0.001 mm (0.0001 in);
s" z0 H5 a; g9 E5 t/ V* J. u就是UL用來測量啞鈴片厚度的,% g% X& F* z6 a! m
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