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13.2.1 Compliance is checked by the following test:3 y2 x3 q' ~% u" L( R' ~
The test is not made on parts of ceramic material or on insulation of wiring." j9 m" z) I0 }/ s& x# D+ D
The test shall be made in a heating cabinet having a temperature 25 °C ± 5 °C in excess of the' `3 n- o8 O' g( r0 k- m2 P7 ]3 U
operating temperature of the relevant part determined during the temperature test (normal0 h0 z! [* L \+ j+ v9 `) q
operation) of Section 12, with a minimum temperature of 125 °C when parts retaining currentcarrying5 h! d3 z" P! K
parts or SELV parts in position are tested, and 75 °C for other parts.
; }+ y5 H/ C" {( ]2 T1 `The surface of the part to be tested shall be placed in the horizontal position and a steel ball of
. m, [/ k" S. `: Z: k6 i5 l& w5 mm diameter pressed against this surface with a force of 20 N. A suitable apparatus for this
5 ]$ {' l, t& v! H+ H! [) mtest is shown in Figure 10. If the surface under test bends, the part where the ball presses6 K0 `( N: X) |6 }! @: h! A
should be supported.
1 w2 f! P+ m0 _+ U/ F @After 1 h, the ball shall be removed from the sample, and the sample shall be cooled by; a+ V+ G1 T$ s! P# T# Z' z
immersion in cold water for 10 s. The diameter of the impression shall be measured and shall
0 D% V8 j& k4 w0 q" R* @ ?5 pnot exceed 2 mm. |
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发表于 2012-3-9 11:27
