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本帖最后由 chinatown 于 2017-1-6 13:48 编辑 % w: |9 C' V4 b* N
* O8 Q- F M% }IEC 60216-4-1 is a standard providing requirements for ovens for aging tests and requires forced gas- x: r& j8 O4 e2 W) F$ o4 m5 l
ventilation. As the ball pressure test is not considered to be an ageing test such forced gas ventilation, G L, ]5 \1 r
is not required and should not be confused with forced convection.
' b) Q/ i6 E- e ZFor the purpose of ball pressure testing chambers with or without forced convection may be used,: P) R) b5 K( ^4 l# E* m$ h# z
provided all other requirements are fulfilled.
6 H+ s+ }: B" I% C# {) U: nFollowing clause 5.2 of the standard and considering the note there, a separate thermocouple on or8 ?6 ^+ R$ w0 ^; S% |0 S9 l
right below the surface of the test specimen support and as close as practical to the test sample shall
! ]! B, g( h8 U' ]: V& kbe used to check that the temperature of the test specimen support does not significantly deviate from% l, y" G1 E0 o3 Y4 W
the test temperature.) p) }! f' `$ W% L
In addition measure the air temperature as close as possible to the test specimen.9 s; b$ ^4 U4 R# R
In case of non-round indentation obtained, report the biggest diameter measurement observed. The
, O, P4 w$ q) B8 {4 i1 D4 U& omaximum difference between the longest and shortest measurement should not exceed 0,2 mm.
; \5 e) C/ }, O" F% ]% tWhere the product standard contains differing or conflicting requirements to IEC 60695-10-2 or to this
9 G, z4 p7 M2 V7 V1 ldecision sheet these product standard requirements override the requirements from IEC 60695-10-2
7 I! h& p- ^. h' J# q6 cand this decision sheet.! j0 H* b0 Z0 D% P% e3 a( j
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发表于 2017-1-6 13:46
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