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' M+ z! p* B: Y; x$ PStandard(s): IEC 60695-10-2/2003 No. Year
0 m" i4 e6 d8 ` @* dCorrigendum 1 (February 2006)/ v7 b2 j& p6 h
DSH$ |0 ^: U R$ q% h/ ~+ j
391.mod. A
/ _# q+ v& W$ U9 y2009- H+ J; w. H( H* t; L' K- R- F! F# C) D
Category: VARIOUS
3 u" Q/ n4 T3 h% A5 k* f* qSubclause(s): 5 – 7.1" g2 b) X- c) K6 V' @- `6 e8 C
Fig. 1 – Fig. 26 h+ S- @6 C" v, r5 X
Developed by: WG4
5 z% E; B7 ^. [2 } a6 [! zSubject: Ball pressure test K e y w o r d s :/ _. b$ T+ h' u" P$ ^6 [
- Lens with a reticule
0 k. `" A' w# P) D5 M- J# {- Diameter of the7 I) d1 e- O! x2 l8 e# L
indentation( n2 t; }+ H. S" ]9 O3 o |
- Steel ball% t* t) `5 W, v% p& Q
- Test specimen support
. N! G% [- \6 N% ^- Loading device
T$ p5 e# t0 ^/ S1 a7 P# s( i) ~$ }Decision approved at the
6 m8 V1 C' w. o0 }, ` l0 X# n46th CTL Plenary Meeting, in
6 B% z& {2 _0 d, V& E20094 S1 i7 {( e+ R
Question:( l/ A) L2 q" A
Define the “best practice” test procedure for ball pressure test consistent with the requirements in
& s$ e, F m) d3 r1 h9 xthe standard.. Q. K: `, G2 S8 ]" C3 ^
Decision:* `6 ]2 r* b0 y
Clause 7.1 – Conduct the test in air, in a heating cabinet at the required temperature within a tolerance of' u. p- @2 t1 Q
+/- 2°C.% W) I" m- |4 G. i3 H5 v2 y* `2 C
Before introducing the test specimen, bring the test apparatus, the test specimen support and loading( f2 W2 p% ]8 Z
device to the required temperature and maintain them at the required temperature for 24 h or until
6 k2 }+ d" w7 d3 Hequilibrium conditions are reached, whichever occurs sooner. Measure the temperature as close as" C" C* }, P" c7 z% Q
possible to the test specimen.3 k% m& @3 G) u( V- E, j1 T
Place the test specimen in a forced air convection single cabinet according to sub clauses 4.1.5 and 4.1.6
1 k$ X0 n5 ?5 N! W9 mof IEC 60216-4-1/1990. Support the specimen on a block, such as stainless steel block, with adequate
* V- h0 Y; \4 fdimensions, so that its upper surface is horizontal. Apply the ball pressure apparatus so that the steel ball
2 N- G7 q* E! o% W5 Kis pressed against the surface with a force of 20 N +/- 0,2 N. Take care to ensure the ball does not move
( |! q1 f8 r, F. cduring the test. After the ball pressure apparatus has been applied for 60 + 2/0 minutes, remove it and
( Z ?5 a2 C1 t, Y4 P; ~immerse the test specimen in ambient temperature water within 10 s. Allow the test specimen to cool in
5 Y7 A5 B5 S bthe water to approximately room temperature for no longer than 8 minutes and remove all traces of water.
8 x" D4 K; p- r1 lClause 7.2 – Within 3 minutes after removal from the water, measure the diameter of the indentation
9 Y* T& t( X" o; j6 j( Y2 Hcaused by the ball to one decimal place. The spherical portion of the indentation to be measured excludes8 M( B$ k: J. q* |
any material deformation around the spherical indentation, as shown in figure 2. In case of doubt, make- q$ a1 _% w# K8 {
two further tests and measure the diameter of the indentation to one decimal place; both of these tests shall. x! k1 U8 v: h. k6 W
meet the requirements of clause 9. The result is expressed as pass if the diameter of the indentation(s)+ T% P& y8 ~) p* A5 u; a. t8 b0 f
does not exceed 2,0 mm. The diameter of the indentation caused by the ball is measured by a lens0 G# c4 F+ J/ u3 [7 }& T2 M! K8 O
(approximate magnification of 10x) equipped with a reticule, a cross-travel measuring table and a lighting' l: @- y5 E* d4 ?$ w: B3 k) K# Y. u+ l
device to enable the illumination of the surface of the test specimen. For measuring the diameter of the4 `& J( k+ K" r
indentation, the reticule is moved from one side to the other.
1 R- Z1 r8 A. }1 V9 [( c2 rIn case of doubt, other instruments may be used, i.e. microscope or profile projector. In case of nonround0 a7 ?9 @/ B) n; a* W1 o4 P
indentation obtained, indicate on the Report the longest measurement observed, maximum
( _; i% W/ j! \: F' Sallowable difference between the longest and shortest measurement: 0,2 mm.
6 i) \* W2 L% z6 T# b1 p% _4 ?4 H$ }/ z9 \3 L/ k# T( Z
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