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13.2.1 Compliance is checked by the following test:
, p, w' N* g) v9 [! v$ mThe test is not made on parts of ceramic material or on insulation of wiring.; o. P$ w3 h2 v' Z( a6 Z, ~% I! y
The test shall be made in a heating cabinet having a temperature 25 °C ± 5 °C in excess of the" o0 s& q& S# h% c1 U2 Z2 o2 w
operating temperature of the relevant part determined during the temperature test (normal
: ~. y4 m! V% r* Z; |operation) of Section 12, with a minimum temperature of 125 °C when parts retaining currentcarrying
8 s9 N: M* _5 Z5 V$ Pparts or SELV parts in position are tested, and 75 °C for other parts.2 O5 F: f7 A8 I) h
The surface of the part to be tested shall be placed in the horizontal position and a steel ball of
; Q) S- B9 G% ^3 p( N4 Y M+ R& B5 mm diameter pressed against this surface with a force of 20 N. A suitable apparatus for this
* |2 x2 _% s, Y4 u5 H9 x1 [0 gtest is shown in Figure 10. If the surface under test bends, the part where the ball presses
+ Y5 t+ |+ j3 s; Oshould be supported.' J7 `6 |* q8 N, M
After 1 h, the ball shall be removed from the sample, and the sample shall be cooled by
( M+ h" f! t3 P, q6 Yimmersion in cold water for 10 s. The diameter of the impression shall be measured and shall1 i% H. G2 ~# H9 W/ E
not exceed 2 mm. |
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发表于 2012-3-9 11:27
