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$ Z) b+ l2 q7 z& R1 q; GStandard(s): IEC 60695-10-2/2003 No. Year0 a( u3 q* `& P/ P
Corrigendum 1 (February 2006)+ N3 s& w9 U& i2 U. G; ^+ F7 D
DSH0 f# J6 x7 f- F6 t$ R7 L+ r% C
391.mod. A$ ?: u8 o9 K$ z0 q- ^
20098 b" P, v8 g5 `1 N
Category: VARIOUS, \" i. M- z+ Y% \$ [; v
Subclause(s): 5 – 7.1( U# j& S* Q) R1 d* y/ F: w$ ~! u
Fig. 1 – Fig. 2
+ W( U7 ~' c8 U4 o! ~6 c5 T/ {Developed by: WG48 t. \4 w4 h5 l$ ^% r# N, B, k
Subject: Ball pressure test K e y w o r d s :
% c+ V( E. o2 X/ J- Lens with a reticule- N3 ~( J8 i! j; f
- Diameter of the
6 Z9 ~3 j: y9 A4 y8 Xindentation/ k4 \) Q7 L/ O& Q( b/ O6 o
- Steel ball
3 n# g- @+ L f4 F- Test specimen support
( _* H y2 v! l( U+ a) V7 w3 b- Loading device l W/ N1 t. V, k2 H' ^. E4 z
Decision approved at the
/ j6 m3 e7 T w' W8 ?9 E7 Z46th CTL Plenary Meeting, in
+ v1 g" H' x: U8 D6 s2009
' {' S$ @: q# E/ v3 RQuestion:
1 _# g( C8 Y; X" R* g9 H* gDefine the “best practice” test procedure for ball pressure test consistent with the requirements in
0 |; v* L2 T4 qthe standard.3 L c& T& w6 j" t& {
Decision:
0 m2 h# _& P! g$ K" z6 E. jClause 7.1 – Conduct the test in air, in a heating cabinet at the required temperature within a tolerance of# o! {9 l$ u& g2 b: F1 `
+/- 2°C.5 b2 @) ?# \9 {0 W5 E
Before introducing the test specimen, bring the test apparatus, the test specimen support and loading7 @% V4 n6 e. j0 k! |, l% v, s. N. Y/ \
device to the required temperature and maintain them at the required temperature for 24 h or until6 N! T" J' h% w. ~
equilibrium conditions are reached, whichever occurs sooner. Measure the temperature as close as
9 `' @7 [3 @8 q; {9 g {possible to the test specimen.: S6 G3 t% ^6 x; D# [
Place the test specimen in a forced air convection single cabinet according to sub clauses 4.1.5 and 4.1.6
^/ }' j' s) t1 z; W5 oof IEC 60216-4-1/1990. Support the specimen on a block, such as stainless steel block, with adequate
" S: _) [2 k- Mdimensions, so that its upper surface is horizontal. Apply the ball pressure apparatus so that the steel ball# K, c# e0 Z. h& z. T4 w! |; q" w' g2 b
is pressed against the surface with a force of 20 N +/- 0,2 N. Take care to ensure the ball does not move
. Y! Z& k2 ^9 b* H! I/ v2 wduring the test. After the ball pressure apparatus has been applied for 60 + 2/0 minutes, remove it and( g. {7 C+ ~; x, Z
immerse the test specimen in ambient temperature water within 10 s. Allow the test specimen to cool in
8 U1 L" E+ f$ y! A+ Gthe water to approximately room temperature for no longer than 8 minutes and remove all traces of water.
8 ~0 K+ c' R0 y3 |8 q" KClause 7.2 – Within 3 minutes after removal from the water, measure the diameter of the indentation) e3 v# M' K: c) y
caused by the ball to one decimal place. The spherical portion of the indentation to be measured excludes
" |, z7 L+ E K: _/ M" P1 M I) |any material deformation around the spherical indentation, as shown in figure 2. In case of doubt, make8 h. j2 e- l v1 B
two further tests and measure the diameter of the indentation to one decimal place; both of these tests shall
& D+ N, O I" d. ~. Emeet the requirements of clause 9. The result is expressed as pass if the diameter of the indentation(s)) T( ~) f# v3 `9 I1 q" G
does not exceed 2,0 mm. The diameter of the indentation caused by the ball is measured by a lens
! m/ A) W- W, m5 r+ S(approximate magnification of 10x) equipped with a reticule, a cross-travel measuring table and a lighting
9 ?9 M5 |6 \: Odevice to enable the illumination of the surface of the test specimen. For measuring the diameter of the
+ u, \+ }' T. i' d2 v+ i3 gindentation, the reticule is moved from one side to the other.) m$ T# _1 A8 i1 N+ d
In case of doubt, other instruments may be used, i.e. microscope or profile projector. In case of nonround
3 c+ i% A- A/ s8 {0 q* Xindentation obtained, indicate on the Report the longest measurement observed, maximum' @* B$ Q( Z. T, `) J
allowable difference between the longest and shortest measurement: 0,2 mm.
1 ? W$ X/ }& y( Z$ q* G9 U Y3 Y* d& L8 V6 M. ?/ m. E+ f! N4 ~
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