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节自IEC 60695-10-2
_6 Z/ x# n; c( l: t, Y7 Test procedure+ d, E! u% P% r0 D x
7.1 Conduct the test in air, in a heating oven at a temperature specified in the relevant specification, within a tolerance of +/-2 o C. The heating oven and test specimen support shall be maintanined at the test temperature for 24 h or until thermal equilibrium is reached, whichever occures sooner.
/ ?0 S6 c4 Z3 g7 \When thermal equilibrium conditions are reached, place the test specimen on the approximate center of the test specimen support so that its upper surface is horizontal. Gently lower the pressure ball on to the appromate centre of the test specimen.7 M2 i1 v. Y( d1 D Z. h
[解读]: 将烤箱与测试样品支架的温度升到设定的温度,维持24h,或者达到热平衡,以时间短者为准。
7 z4 Z4 I) h" p$ y8 B2 u3 t5 c& N 将样品放在压头的条件是(烤箱与测试样品支架的温度升到设定的温度,并且)达到热平衡,所以之前达到热平衡的时间不算在内。否则,因为加热温升速率的不同和达到热平衡时间的不确定性,时间不好控制,比如,达到热平衡的时间是1.5小时,很显然与60min的测试时间相矛盾。 |
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