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| DSH 391.mod. A: L6 }% u$ q8 `+ j
; d, R2 U2 w7 q
| Ball pressure test
! ?7 X+ f. V# s' q5 [- D' B | 5 – 7.1, Fig. 1 – Fig. 2% J; ?. @" z k, e, o& G2 Y0 }- z
| 60695-10-2(ed.1)
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Standard(s): IEC 60695-10-2/2003 No. Year- K1 M$ ]5 Z' W: y1 m. g4 E
Corrigendum 1 (February 2006): X, i7 G6 |& T( A) b
DSH3 a5 \& K ]7 `, y
391.mod. A
, T- H L3 u. R! z3 h2 @& _2009
! O$ w' y/ H1 L* zCategory: VARIOUS
{- f6 n9 H2 \% ZSubclause(s): 5 – 7.1
, T9 N2 B8 B& H7 t/ H" oFig. 1 – Fig. 2
J. m; Z& r# D5 S$ o" \Developed by: WG4 o* M' Z3 D/ C! p5 h7 r
Subject: Ball pressure test K e y w o r d s :' f. B0 r: J! J( p
- Lens with a reticule) h/ z% x3 k& K+ o
- Diameter of the6 L: `/ n. o; P. M5 e( o* b( W
indentation) Y0 N/ M9 q C0 ^6 {) x5 l
- Steel ball
$ C8 T k$ j, x% M/ F) z- Test specimen support- o5 t8 u" b# p
- Loading device+ I0 k0 C7 ]" U, l- `: e- a' i
Decision approved at the1 U! X) t1 z8 m: B% r, i
46th CTL Plenary Meeting, in
: i: H2 o6 F2 c6 }; ^% g2009
. r& \0 _( R: {1 J+ u( hQuestion:" Z& ~2 a) B0 p0 l! f
Define the “best practice” test procedure for ball pressure test consistent with the requirements in
. H7 J& N; A! v9 pthe standard.
6 X& U7 ]* _+ J" f$ T5 N4 w9 GDecision:6 S% N0 o9 d: ?% n
Clause 7.1 – Conduct the test in air, in a heating cabinet at the required temperature within a tolerance of
4 X) i) i3 ^6 a+/- 2°C.7 @( u/ U( P2 z# P' c) _1 V; x
Before introducing the test specimen, bring the test apparatus, the test specimen support and loading% s9 b0 |, d& b0 A
device to the required temperature and maintain them at the required temperature for 24 h or until
0 @9 q4 t" p! [. J/ ^: Y& [2 Qequilibrium conditions are reached, whichever occurs sooner. Measure the temperature as close as
3 H3 K2 F9 o- \7 |1 @9 Q" U7 wpossible to the test specimen.! j" Z3 p, @# |, l
Place the test specimen in a forced air convection single cabinet according to sub clauses 4.1.5 and 4.1.6/ c& v; A8 s: A! @8 l# Q/ _
of IEC 60216-4-1/1990. Support the specimen on a block, such as stainless steel block, with adequate3 a9 d$ Q. a# j* o" W: k1 N
dimensions, so that its upper surface is horizontal. Apply the ball pressure apparatus so that the steel ball$ ?8 [ a6 H& B" [
is pressed against the surface with a force of 20 N +/- 0,2 N. Take care to ensure the ball does not move
, o% I" e9 H& z7 lduring the test. After the ball pressure apparatus has been applied for 60 + 2/0 minutes, remove it and5 Y! y9 L8 D9 [
immerse the test specimen in ambient temperature water within 10 s. Allow the test specimen to cool in
: r3 R* ]6 j) e, T. gthe water to approximately room temperature for no longer than 8 minutes and remove all traces of water.1 S L% M1 p/ B! w3 S( {, J
Clause 7.2 – Within 3 minutes after removal from the water, measure the diameter of the indentation9 G# k; U j d- E
caused by the ball to one decimal place. The spherical portion of the indentation to be measured excludes+ z) n4 j' X$ B- `/ q# J$ }" ?
any material deformation around the spherical indentation, as shown in figure 2. In case of doubt, make8 @; g: H) z" e, g/ O$ B2 ?
two further tests and measure the diameter of the indentation to one decimal place; both of these tests shall
8 x) B* K. a8 ~0 Umeet the requirements of clause 9. The result is expressed as pass if the diameter of the indentation(s)" ^; ?! I0 _& H
does not exceed 2,0 mm. The diameter of the indentation caused by the ball is measured by a lens
. J. [* ]! N1 ^(approximate magnification of 10x) equipped with a reticule, a cross-travel measuring table and a lighting9 |/ e2 D5 B+ Y6 ?& {
device to enable the illumination of the surface of the test specimen. For measuring the diameter of the. A, N7 t/ K8 a/ o4 b8 G
indentation, the reticule is moved from one side to the other.
5 E# b+ B7 d! vIn case of doubt, other instruments may be used, i.e. microscope or profile projector. In case of nonround
0 M# u. N) L" dindentation obtained, indicate on the Report the longest measurement observed, maximum
) d* E" [6 P# kallowable difference between the longest and shortest measurement: 0,2 mm.
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