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本帖最后由 CHENGFEGO 于 2013-12-19 16:09 编辑
% s$ R6 C: r$ `# {lengchuan000 发表于 2013-12-19 15:48 1 r3 l# d! z# q i( \4 A
请教一下UL什么要求 $ w2 l+ n- v* x# d
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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
* F# _( l3 o9 \/ y- ]' iexerting a total force of 0.83 ±0.03 N (3.0 ±0.1 ozf) on a rectangular anvil measuring1 A. u' j0 F3 d1 L7 r5 I/ E$ T& o
approximately 9 x 2 mm (0.35 x 0.08 in). The face of the anvil on the minor dimension shall be# G: d. m5 M( P! Q
slightly convex. Alternatively, these measurements shall be made with a dead-weight dial1 o7 e! K3 F" s( l, d
micrometer having a presser foot 6.4 ±0.2 mm (0.248 ±0.010 in) in diameter and exerting a total
* W2 {. U& T& q7 \) l8 U" iof 85 ±3 gf or 0.83 ±0.03 N (3.0 ±0.1 ozf) on the specimen – the load being applied by means
/ @1 M# m! o4 ^% a7 v4 x. r! r8 vof a weight. The presser foot shall be at least 2 mm (0.08 in) onto the edge of the specimen for0 g, g. A+ F* r) G" y7 p
each measurement. Micrometers shall have a resolution and accuracy of 0.01 mm (0.001 in);
4 W4 V( O* v) Y3 Z; h& Q& V/ A$ {f) a micrometer with a resolution and accuracy of 0.001 mm (0.0001 in);" g/ O/ G6 R Y6 E
就是UL用來測量啞鈴片厚度的, w/ i. [0 B0 M5 }2 K
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