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本帖最后由 CHENGFEGO 于 2013-12-19 16:09 编辑
( N4 ? J- u; m! T( E+ Glengchuan000 发表于 2013-12-19 15:48
. ~0 m8 t- f. g4 L5 Z) |4 n请教一下UL什么要求 % @. a4 `: D; W, |+ }
' T1 x$ t2 E1 pa dial micrometer having a 6.3 to 6.4 mm (0.248 to 0.252 in) diameter flat presser foot, F6 {* e) l( c0 g8 W: \& T
exerting a total force of 0.83 ±0.03 N (3.0 ±0.1 ozf) on a rectangular anvil measuring( p8 `# I/ @3 l
approximately 9 x 2 mm (0.35 x 0.08 in). The face of the anvil on the minor dimension shall be6 n' }' Y; F7 e
slightly convex. Alternatively, these measurements shall be made with a dead-weight dial
4 U" w4 E) c# g, L" Y6 {micrometer having a presser foot 6.4 ±0.2 mm (0.248 ±0.010 in) in diameter and exerting a total
8 ~) r/ t- ^$ Q. k' |of 85 ±3 gf or 0.83 ±0.03 N (3.0 ±0.1 ozf) on the specimen – the load being applied by means, P6 ?# p. f! q; S3 L7 V5 O" D
of a weight. The presser foot shall be at least 2 mm (0.08 in) onto the edge of the specimen for
$ M# n0 H. u5 C6 F9 Y, ]# i) u. @) Jeach measurement. Micrometers shall have a resolution and accuracy of 0.01 mm (0.001 in);
# [$ t" C, ~* p5 d+ m6 yf) a micrometer with a resolution and accuracy of 0.001 mm (0.0001 in);
/ ]3 M! k1 K# z. t0 o" z3 R* g就是UL用來測量啞鈴片厚度的,5 o# P8 s8 i7 K7 I T
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