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本帖最后由 chinatown 于 2017-1-6 13:48 编辑
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$ i# w6 t* O# e6 O1 u4 s8 P2 [" GIEC 60216-4-1 is a standard providing requirements for ovens for aging tests and requires forced gas
* b( f- j; [9 E4 u5 w) T( H$ Rventilation. As the ball pressure test is not considered to be an ageing test such forced gas ventilation/ y& X: I t# }/ V0 ~ j. o
is not required and should not be confused with forced convection.# S; f, x% ~# t, A
For the purpose of ball pressure testing chambers with or without forced convection may be used,
6 A i) ]0 d) ~provided all other requirements are fulfilled.
, G! q/ L( ?# L' pFollowing clause 5.2 of the standard and considering the note there, a separate thermocouple on or
$ M9 n4 v; _+ e8 Q D2 i' N4 y! {right below the surface of the test specimen support and as close as practical to the test sample shall
3 g( J# u8 _3 t* {( A0 z1 f! a( Nbe used to check that the temperature of the test specimen support does not significantly deviate from
a1 a7 ?" K8 O4 |3 D3 Lthe test temperature.
" o4 Q) O, \( B) {9 T, q7 bIn addition measure the air temperature as close as possible to the test specimen.# r' _. c4 F" K1 P
In case of non-round indentation obtained, report the biggest diameter measurement observed. The
1 q Q" q- \+ ]# O) Amaximum difference between the longest and shortest measurement should not exceed 0,2 mm.
' p) V- Q9 H$ X9 zWhere the product standard contains differing or conflicting requirements to IEC 60695-10-2 or to this: {8 T" ?, M7 n$ O+ f" m+ H4 ^
decision sheet these product standard requirements override the requirements from IEC 60695-10-2, h% Y5 H8 u; c
and this decision sheet.4 T" X! a) ~- d5 E/ B
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发表于 2017-1-6 13:46
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