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本帖最后由 chinatown 于 2017-1-6 13:48 编辑 }, H2 i" ^2 I8 U, W( ^
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IEC 60216-4-1 is a standard providing requirements for ovens for aging tests and requires forced gas
/ X0 H) D$ V- B/ P. A& q9 hventilation. As the ball pressure test is not considered to be an ageing test such forced gas ventilation
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For the purpose of ball pressure testing chambers with or without forced convection may be used,( I" Z# ^9 q! L0 w6 U& k4 U# ^
provided all other requirements are fulfilled.4 v3 w& P9 ~4 O
Following clause 5.2 of the standard and considering the note there, a separate thermocouple on or4 a' @& F! h/ T0 T$ t
right below the surface of the test specimen support and as close as practical to the test sample shall+ l/ L- a+ L/ c" V
be used to check that the temperature of the test specimen support does not significantly deviate from/ b, z1 c' x5 F- G& B" K. ?3 h' Y# }( v
the test temperature.( q8 F( V6 S6 }4 e! a0 F7 J0 u
In addition measure the air temperature as close as possible to the test specimen.
7 ~" l$ c/ v" s& c9 @5 xIn case of non-round indentation obtained, report the biggest diameter measurement observed. The1 i! u: x: O3 f+ a5 _2 b
maximum difference between the longest and shortest measurement should not exceed 0,2 mm.& ^3 ~% V" H* k" A0 b7 b' ]
Where the product standard contains differing or conflicting requirements to IEC 60695-10-2 or to this7 s1 D. z0 {* y# f- l
decision sheet these product standard requirements override the requirements from IEC 60695-10-2, J; l+ ~! ?6 Z$ U3 ^" _4 r X5 {
and this decision sheet.! O! _- x7 h* ~5 ~4 w
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