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| DSH 391.mod. A) p+ ?% ~. q- z7 E
; Y; Q% i. q- z, ^ C | Ball pressure test2 z( ~7 y- J' X' D- F4 m9 r6 u
| 5 – 7.1, Fig. 1 – Fig. 2
( s( q( p. {- u3 Y6 Z$ x4 y# v% t | 60695-10-2(ed.1), x8 E7 {4 s$ d2 p9 A% `2 z
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6 g/ m4 _- T# M5 b) d$ f$ C5 xStandard(s): IEC 60695-10-2/2003 No. Year
& E9 U) A& E" KCorrigendum 1 (February 2006)
1 B# R# A# T2 d0 e. F s% i9 A- hDSH! C8 i4 y8 z, y* G: ]" _" g0 a
391.mod. A: ?& L" J" u/ F! @
2009
$ |& N! p: c( T! P: JCategory: VARIOUS1 ~) ~+ Z# S! X2 S# s7 }+ v
Subclause(s): 5 – 7.1
6 ?- K: w* c& r: |8 ]% A8 ]Fig. 1 – Fig. 2
+ U5 k. ?. }: T0 nDeveloped by: WG4
, O( @/ k, d* K1 SSubject: Ball pressure test K e y w o r d s :
) B2 c; \ }( v6 D+ T% {4 ]/ _, u5 G- Lens with a reticule
8 o. |8 M1 S P: u0 C. o- Diameter of the
9 g! Z1 Q6 F* O; H; oindentation, m( p' h) n9 l1 m# B$ s
- Steel ball! ? d5 V; v( a5 c/ T. S5 k
- Test specimen support7 K. r0 \0 {, q5 y7 Y0 Q+ [
- Loading device
9 h! ?: N& J6 |# q# Z6 o- |7 g- BDecision approved at the- |3 q7 v- H) g" j8 H
46th CTL Plenary Meeting, in U. M7 J, m6 {$ R J
2009
, g1 |% G* J& _% IQuestion:
5 k4 w/ o, x1 N* y5 ^Define the “best practice” test procedure for ball pressure test consistent with the requirements in- i# X; G# K4 S, a# b: G, f$ H' w
the standard.
, `$ c/ O9 ?0 o- K, i8 N5 oDecision:9 \1 g' \# L( D+ b7 G1 i" t: F8 v
Clause 7.1 – Conduct the test in air, in a heating cabinet at the required temperature within a tolerance of! h+ E( Z$ U* w) }7 N1 x. T2 |% s& c
+/- 2°C.) c# |3 A6 Y. }3 N3 k
Before introducing the test specimen, bring the test apparatus, the test specimen support and loading
; m6 m [) I, M/ D! |& }( sdevice to the required temperature and maintain them at the required temperature for 24 h or until% w5 f! Q, o9 {' V
equilibrium conditions are reached, whichever occurs sooner. Measure the temperature as close as% [9 M8 [' s! L8 H
possible to the test specimen.
3 r- R ~/ l; `3 X. i( wPlace the test specimen in a forced air convection single cabinet according to sub clauses 4.1.5 and 4.1.6
; Z9 l2 f5 M9 I. L7 Y9 e: k4 Jof IEC 60216-4-1/1990. Support the specimen on a block, such as stainless steel block, with adequate4 P4 F3 V) N3 F* H1 {3 W
dimensions, so that its upper surface is horizontal. Apply the ball pressure apparatus so that the steel ball4 @* D) B* d) o8 \
is pressed against the surface with a force of 20 N +/- 0,2 N. Take care to ensure the ball does not move
' [! s+ }: l7 {! Z: Kduring the test. After the ball pressure apparatus has been applied for 60 + 2/0 minutes, remove it and- M g* h2 h3 p# o [
immerse the test specimen in ambient temperature water within 10 s. Allow the test specimen to cool in/ [, k2 p$ e! k+ ]
the water to approximately room temperature for no longer than 8 minutes and remove all traces of water.
- w1 ~7 j' P# R% b; l: eClause 7.2 – Within 3 minutes after removal from the water, measure the diameter of the indentation9 w0 s. z1 g( Y
caused by the ball to one decimal place. The spherical portion of the indentation to be measured excludes
5 T: m/ L4 K. [9 L# {9 Rany material deformation around the spherical indentation, as shown in figure 2. In case of doubt, make
. R! O; u2 S1 _+ z8 i* stwo further tests and measure the diameter of the indentation to one decimal place; both of these tests shall
4 W$ J! Z A2 \3 ^0 Umeet the requirements of clause 9. The result is expressed as pass if the diameter of the indentation(s)
( w5 v3 Q" w9 {does not exceed 2,0 mm. The diameter of the indentation caused by the ball is measured by a lens- E! E, o- g3 s& n$ W2 J
(approximate magnification of 10x) equipped with a reticule, a cross-travel measuring table and a lighting
. j% b4 m# G6 } p3 m+ _5 mdevice to enable the illumination of the surface of the test specimen. For measuring the diameter of the
: j( u3 |0 [6 V$ e. G9 Uindentation, the reticule is moved from one side to the other.
2 ]: c" K% b+ u" a& p2 \In case of doubt, other instruments may be used, i.e. microscope or profile projector. In case of nonround& t5 b1 y8 j# W/ ]$ _
indentation obtained, indicate on the Report the longest measurement observed, maximum2 u% |8 Q% c2 W2 h) B" F& y" L
allowable difference between the longest and shortest measurement: 0,2 mm.
8 C3 W# Z9 D: O9 C7 T- J' Q2 e& ]+ K8 J" F& @- \, L0 B
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