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本帖最后由 CHENGFEGO 于 2013-12-19 16:09 编辑
5 P* @2 j: H8 c% }# f, I# Vlengchuan000 发表于 2013-12-19 15:48 ) E0 A' U* L+ ?; t, I$ q
请教一下UL什么要求 7 j: r, I t4 k) ?$ `8 i; r! e7 J# 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( A0 |; L) ~( Z1 ^' O) W# u
exerting a total force of 0.83 ±0.03 N (3.0 ±0.1 ozf) on a rectangular anvil measuring
* i& Z n2 ]2 y- n( oapproximately 9 x 2 mm (0.35 x 0.08 in). The face of the anvil on the minor dimension shall be
1 L9 _+ ^( I* W: [slightly convex. Alternatively, these measurements shall be made with a dead-weight dial! b, P) M1 M8 L2 _$ I) e
micrometer having a presser foot 6.4 ±0.2 mm (0.248 ±0.010 in) in diameter and exerting a total) j. ]/ I2 h$ N$ x: R
of 85 ±3 gf or 0.83 ±0.03 N (3.0 ±0.1 ozf) on the specimen – the load being applied by means( ~: `. r; |, ~$ \( l
of a weight. The presser foot shall be at least 2 mm (0.08 in) onto the edge of the specimen for9 M5 V) h$ y4 T2 T
each measurement. Micrometers shall have a resolution and accuracy of 0.01 mm (0.001 in);1 {0 `: x1 \' _ ^7 u
f) a micrometer with a resolution and accuracy of 0.001 mm (0.0001 in);6 U5 g' F. ~2 d* q3 m2 D9 x
就是UL用來測量啞鈴片厚度的,5 l( ^3 J! }. }8 d# J: I
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