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本帖最后由 chinatown 于 2017-1-6 13:48 编辑
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}; W! F7 s8 J( w$ x; n0 V" K/ IIEC 60216-4-1 is a standard providing requirements for ovens for aging tests and requires forced gas
/ R5 S$ I, p2 d( W) Gventilation. As the ball pressure test is not considered to be an ageing test such forced gas ventilation" g) D7 |1 r' ^1 m9 l
is not required and should not be confused with forced convection.% p2 s8 i% U ]7 e3 @7 ]6 R
For the purpose of ball pressure testing chambers with or without forced convection may be used,+ S/ K% i# m/ R$ L- W* w
provided all other requirements are fulfilled.) m0 x" n* h+ I& j
Following clause 5.2 of the standard and considering the note there, a separate thermocouple on or& \8 o {4 K% T0 C
right below the surface of the test specimen support and as close as practical to the test sample shall8 g( n: E o4 b! o' P! P
be used to check that the temperature of the test specimen support does not significantly deviate from- [' i& K- e8 C9 V) s7 y
the test temperature.
# ?$ P" H- P, {, P# K- ?9 ?' R6 IIn addition measure the air temperature as close as possible to the test specimen.0 x4 R, O* o! I3 V ]! W
In case of non-round indentation obtained, report the biggest diameter measurement observed. The
0 u6 v, h3 m0 ^- Hmaximum difference between the longest and shortest measurement should not exceed 0,2 mm.
% v3 \/ b; I5 D3 v" m( B/ vWhere the product standard contains differing or conflicting requirements to IEC 60695-10-2 or to this
: J) W4 ]+ s: c: }& ]6 adecision sheet these product standard requirements override the requirements from IEC 60695-10-2; U0 x5 u! ]1 t, R7 s
and this decision sheet.; y) ^1 ^% X6 I- [7 A, w1 m8 N
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发表于 2017-1-6 13:46
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