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本帖最后由 CHENGFEGO 于 2013-12-19 16:09 编辑 ' Q3 L K* T7 `& O; o
lengchuan000 发表于 2013-12-19 15:48
n( `# c* k1 M9 k% p* w# \请教一下UL什么要求
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' y/ ]. } I+ v: a9 M3 ?a dial micrometer having a 6.3 to 6.4 mm (0.248 to 0.252 in) diameter flat presser foot/ D4 C3 ^* }9 g5 l
exerting a total force of 0.83 ±0.03 N (3.0 ±0.1 ozf) on a rectangular anvil measuring; \$ k/ n2 Q# O8 l5 \. W- ~; m
approximately 9 x 2 mm (0.35 x 0.08 in). The face of the anvil on the minor dimension shall be
( H3 X# o. s5 R! Q. `& oslightly convex. Alternatively, these measurements shall be made with a dead-weight dial
' u/ u0 \! u) C! emicrometer having a presser foot 6.4 ±0.2 mm (0.248 ±0.010 in) in diameter and exerting a total9 F- C6 a9 W; J7 f6 K$ g
of 85 ±3 gf or 0.83 ±0.03 N (3.0 ±0.1 ozf) on the specimen – the load being applied by means
/ L& g% q' ?/ I$ F$ Xof a weight. The presser foot shall be at least 2 mm (0.08 in) onto the edge of the specimen for$ s# J1 j. K J$ H0 C3 i
each measurement. Micrometers shall have a resolution and accuracy of 0.01 mm (0.001 in);
% e4 H/ p3 h1 B2 af) a micrometer with a resolution and accuracy of 0.001 mm (0.0001 in);
4 Z1 `0 c. d; x1 M9 a1 ^1 d就是UL用來測量啞鈴片厚度的,- I* u" M/ g9 Z) R
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