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本帖最后由 CHENGFEGO 于 2013-12-19 16:09 编辑
' v0 _$ j3 V+ ^+ ]9 Wlengchuan000 发表于 2013-12-19 15:48 s+ ?6 s, s8 z
请教一下UL什么要求 . y6 a9 h: E9 O/ d" \9 j6 B6 K8 t9 L
4 t6 h4 W' I; Z sa dial micrometer having a 6.3 to 6.4 mm (0.248 to 0.252 in) diameter flat presser foot
8 z! ], g% E6 N4 S5 d5 V5 L1 @! |6 I) eexerting a total force of 0.83 ±0.03 N (3.0 ±0.1 ozf) on a rectangular anvil measuring5 h# D2 r5 i4 G+ a2 m& | ^
approximately 9 x 2 mm (0.35 x 0.08 in). The face of the anvil on the minor dimension shall be
/ g! v" ?0 O7 Tslightly convex. Alternatively, these measurements shall be made with a dead-weight dial. B9 [4 x! B6 ]& J+ k8 j4 I/ x
micrometer having a presser foot 6.4 ±0.2 mm (0.248 ±0.010 in) in diameter and exerting a total- }8 W( R2 W& b# a9 U
of 85 ±3 gf or 0.83 ±0.03 N (3.0 ±0.1 ozf) on the specimen – the load being applied by means
! J" j* {9 }% q9 Vof a weight. The presser foot shall be at least 2 mm (0.08 in) onto the edge of the specimen for: X( t/ ]% ]. C L
each measurement. Micrometers shall have a resolution and accuracy of 0.01 mm (0.001 in);1 @2 e" K" G9 b' K
f) a micrometer with a resolution and accuracy of 0.001 mm (0.0001 in);2 d) I1 o5 P6 [% _/ T3 Q3 x1 g6 D
就是UL用來測量啞鈴片厚度的,
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