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| DSH 391.mod. A0 f. z: [8 ^$ s
0 f$ M! e/ U0 R$ Z) Q* x | Ball pressure test
1 ?" O/ c/ |) D1 S% A | 5 – 7.1, Fig. 1 – Fig. 26 }' s) d+ C; k; p" D
| 60695-10-2(ed.1)% S u6 D# ]) j6 v) N
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5 a0 }1 ]& ^2 \' FStandard(s): IEC 60695-10-2/2003 No. Year$ t: R* C* m$ ~
Corrigendum 1 (February 2006)
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" }1 }( H( @6 x _$ ^9 A391.mod. A. Z- O1 o. l X% u6 v! B2 P4 n
2009+ Z: @( b& z1 P
Category: VARIOUS
) `/ j6 \% I; K. Y+ ?& u2 [2 ySubclause(s): 5 – 7.1
# U0 T& F q# v pFig. 1 – Fig. 2- C2 `: g& X. ~2 o" F& r: J. t
Developed by: WG4; Z0 I0 U" N3 ~8 j: ?* Z8 Z
Subject: Ball pressure test K e y w o r d s :2 c7 Q4 \. S" h! {, A4 U" Z5 z
- Lens with a reticule
" _) T; f7 a" T8 I3 Y0 \- w- Diameter of the& W$ a4 C$ F6 z0 W+ u
indentation4 Y" O# ]- A; m1 j ?
- Steel ball
- s3 ^6 \0 ^3 B1 O7 k, S- Test specimen support; a7 m( |; f. r2 R+ h
- Loading device
& T( M8 p% |6 W6 N4 e$ V7 N1 X- aDecision approved at the
" m1 d" |$ G; H4 N1 r. p46th CTL Plenary Meeting, in
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& \3 `" c3 U- N1 u6 ]Question:
9 l! d) I2 i t1 jDefine the “best practice” test procedure for ball pressure test consistent with the requirements in# d ^& t9 y" }7 v8 M- Y0 G
the standard./ G" J2 W4 J5 h
Decision:( b. V( w7 g; K6 H0 {8 M( f
Clause 7.1 – Conduct the test in air, in a heating cabinet at the required temperature within a tolerance of) l6 m1 I0 p f# ^% e7 b7 S4 w0 n
+/- 2°C.
8 ~& R% P. V6 yBefore introducing the test specimen, bring the test apparatus, the test specimen support and loading0 U8 h" d3 a, P7 K/ G
device to the required temperature and maintain them at the required temperature for 24 h or until. @6 E, w2 I+ g/ o+ k5 [& c
equilibrium conditions are reached, whichever occurs sooner. Measure the temperature as close as9 S) a0 k# I! u6 D
possible to the test specimen.
% L# e$ d, i% e8 s4 ?$ ~, NPlace the test specimen in a forced air convection single cabinet according to sub clauses 4.1.5 and 4.1.6( K4 Z5 q7 G8 Z5 I6 u
of IEC 60216-4-1/1990. Support the specimen on a block, such as stainless steel block, with adequate
; g7 h. c9 V! K( gdimensions, so that its upper surface is horizontal. Apply the ball pressure apparatus so that the steel ball" c1 p- y5 G3 r# d6 U% I4 U0 Z
is pressed against the surface with a force of 20 N +/- 0,2 N. Take care to ensure the ball does not move
7 O% N0 c8 C) j2 M2 M5 zduring the test. After the ball pressure apparatus has been applied for 60 + 2/0 minutes, remove it and
Q7 e$ ?+ S* S0 W' W8 wimmerse the test specimen in ambient temperature water within 10 s. Allow the test specimen to cool in
% m* j2 O/ d; v4 Z8 y# C4 z4 Dthe water to approximately room temperature for no longer than 8 minutes and remove all traces of water.
* ^2 q9 z; q6 Y4 KClause 7.2 – Within 3 minutes after removal from the water, measure the diameter of the indentation& B3 ]* \4 n1 [! r8 {
caused by the ball to one decimal place. The spherical portion of the indentation to be measured excludes
3 [6 ^, q9 R, z) G$ rany material deformation around the spherical indentation, as shown in figure 2. In case of doubt, make
' N, [% \7 [8 }7 {two further tests and measure the diameter of the indentation to one decimal place; both of these tests shall# D+ n7 k* d/ t4 c4 N
meet the requirements of clause 9. The result is expressed as pass if the diameter of the indentation(s)$ U6 |, \7 ?% K
does not exceed 2,0 mm. The diameter of the indentation caused by the ball is measured by a lens
* n+ K/ V3 u4 x: `3 C. I* @(approximate magnification of 10x) equipped with a reticule, a cross-travel measuring table and a lighting: e" ?! d5 e# A' j
device to enable the illumination of the surface of the test specimen. For measuring the diameter of the: l$ N: k2 v% o/ \/ X& f8 j
indentation, the reticule is moved from one side to the other.7 ^' P0 N+ i$ O/ _
In case of doubt, other instruments may be used, i.e. microscope or profile projector. In case of nonround$ ?. E: J2 p6 P/ _, \8 z# B- K
indentation obtained, indicate on the Report the longest measurement observed, maximum2 ]! t% u; q5 z0 |
allowable difference between the longest and shortest measurement: 0,2 mm.
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