. ~5 w& o; K. }2 T% N; qStandard(s): IEC 60695-10-2/2003 No. Year( v {8 e) ^. x: |) I
Corrigendum 1 (February 2006) " }- R, l* a; aDSH : G% X1 k2 @! t/ g) C391.mod. A 2 _" Q# }! J" Z& D2009. g- E# q8 T; m' H* G
Category: VARIOUS 2 |. g$ Q v6 M9 v% \! m. ASubclause(s): 5 – 7.1 ) v7 l, `+ A0 s' aFig. 1 – Fig. 2 ! ~; r& @- S- t' Y E+ A3 Z2 e/ yDeveloped by: WG4 . Z e& O1 B2 rSubject: Ball pressure test K e y w o r d s :/ j, U f- i5 J- c( s# Q: _
- Lens with a reticule% {- s" C$ i3 q [4 B
- Diameter of the( _8 S& g* w: n+ j; D4 s5 J! g
indentation4 F3 s2 b$ r6 _4 a
- Steel ball# {% W/ a3 t- s0 s3 A4 H
- Test specimen support . s' C L& p& O) e# \ ^4 h6 @- Loading device $ ^, @! B; a; A) E- j7 z7 s' LDecision approved at the6 j4 N+ n+ V' Y6 e, y: C! ]
46th CTL Plenary Meeting, in/ F3 z8 G0 f, N8 w3 c" l: D
20098 ]9 U# J9 k# x; L/ r+ G
Question:6 R1 {) ]$ m& s! l, i3 ^! N" }
Define the “best practice” test procedure for ball pressure test consistent with the requirements in 7 ~4 P( [6 K4 r4 mthe standard.# K, n& K3 K {5 k/ V, t! G
Decision: ( R7 i& p) w$ o$ ]8 R; v9 p* [Clause 7.1 – Conduct the test in air, in a heating cabinet at the required temperature within a tolerance of& F* p t1 z7 v- ^! u' [' Z, p R$ ^
+/- 2°C. G( d% U. I% r/ P, D
Before introducing the test specimen, bring the test apparatus, the test specimen support and loading7 T$ X" D- Z6 ~, j7 K/ v1 _! C ?
device to the required temperature and maintain them at the required temperature for 24 h or until 3 P% T. W E' z. S" E. k' B$ o" W2 zequilibrium conditions are reached, whichever occurs sooner. Measure the temperature as close as ! c9 c( f+ s3 `# V4 D9 n {) Ipossible to the test specimen. 8 O5 F3 U+ g2 ^! ]Place the test specimen in a forced air convection single cabinet according to sub clauses 4.1.5 and 4.1.6 - w9 F( a8 D1 @0 ~' z: rof IEC 60216-4-1/1990. Support the specimen on a block, such as stainless steel block, with adequate$ z* G3 @; u2 s8 o- d r
dimensions, so that its upper surface is horizontal. Apply the ball pressure apparatus so that the steel ball 7 w9 h) h( [* |+ y- A+ X/ His pressed against the surface with a force of 20 N +/- 0,2 N. Take care to ensure the ball does not move 5 ?( a! F% E- v0 _0 Oduring the test. After the ball pressure apparatus has been applied for 60 + 2/0 minutes, remove it and 4 U3 o* ]6 m# b1 l1 s0 O9 Iimmerse the test specimen in ambient temperature water within 10 s. Allow the test specimen to cool in . }9 k2 j- O2 Pthe water to approximately room temperature for no longer than 8 minutes and remove all traces of water. ' r- M% E d! I( @' H0 kClause 7.2 – Within 3 minutes after removal from the water, measure the diameter of the indentation+ B+ R( ]& j: \
caused by the ball to one decimal place. The spherical portion of the indentation to be measured excludes ) ^* o p+ M5 Uany material deformation around the spherical indentation, as shown in figure 2. In case of doubt, make! ]; r4 k ^: @0 K8 E6 a
two further tests and measure the diameter of the indentation to one decimal place; both of these tests shall5 S9 _% C0 i0 S/ i. q
meet the requirements of clause 9. The result is expressed as pass if the diameter of the indentation(s)" U" h- C) `7 R# A r
does not exceed 2,0 mm. The diameter of the indentation caused by the ball is measured by a lens G( B) N! S j, [(approximate magnification of 10x) equipped with a reticule, a cross-travel measuring table and a lighting ! U0 c* _) H0 a _5 s+ gdevice to enable the illumination of the surface of the test specimen. For measuring the diameter of the$ ?5 E3 ]7 Y2 S9 x& ~) N5 N: Q
indentation, the reticule is moved from one side to the other. 6 F# a' N8 A T& T/ e4 o9 g* u1 c- kIn case of doubt, other instruments may be used, i.e. microscope or profile projector. In case of nonround' W0 {( t/ L4 A7 A- u
indentation obtained, indicate on the Report the longest measurement observed, maximum2 i9 B# W# @: F, U
allowable difference between the longest and shortest measurement: 0,2 mm.5 M1 \3 T8 H* E: n
[attach]77314[/attach] 1 G& r- G/ D/ j6 J0 z4 h& ~
DSH 391.mod. A