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| DSH 391.mod. A0 F2 N# @1 m2 ~. I* t
- g. h& j5 L. D b | Ball pressure test
' X2 P3 J7 U& K2 m, K5 D | 5 – 7.1, Fig. 1 – Fig. 2) ]8 S3 I, Q4 Q
| 60695-10-2(ed.1)
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Standard(s): IEC 60695-10-2/2003 No. Year6 `' g6 C1 ^/ | Q7 e8 c
Corrigendum 1 (February 2006)
/ l9 |5 c3 I3 x0 m6 z7 K) {DSH
- l0 N/ P: e) B/ I391.mod. A1 _. `, A8 F. E5 m& `
2009
/ ?5 |/ F, G6 y. ?; S- ]' Q* XCategory: VARIOUS
* E& O% i7 n4 x0 V, ]Subclause(s): 5 – 7.1
3 m! d5 R9 p6 L/ x6 z% h1 o- m1 M. fFig. 1 – Fig. 2) m B8 R" z: z/ k. s
Developed by: WG4
e2 k# ^" c$ @0 gSubject: Ball pressure test K e y w o r d s :& H) D# l5 C, @' I- P0 @/ z
- Lens with a reticule5 D$ `5 S+ u# m0 s
- Diameter of the' T* j# o9 U9 Y9 d- U2 z2 }
indentation
6 j- i! O4 \$ l* p- Steel ball! K# ~/ [2 y. k: l X: j
- Test specimen support: Y! }/ Y" L4 A" m, g& b9 F
- Loading device; [% _& E( L( W: v8 x
Decision approved at the7 M4 | W0 `, C6 Z# r8 T
46th CTL Plenary Meeting, in& i v; c1 v* d$ ~8 T* |
2009
8 N# \# O# L/ g; q2 I/ tQuestion:4 I! J6 ~* A8 R, ]! G
Define the “best practice” test procedure for ball pressure test consistent with the requirements in6 Z* P: Q( ^7 t1 J
the standard.- e) Y. n/ G; w! G
Decision:
. G1 s1 [4 X8 g! `' U/ UClause 7.1 – Conduct the test in air, in a heating cabinet at the required temperature within a tolerance of# k i4 R* H* F/ {. K
+/- 2°C.5 y3 B8 O c3 ]1 ^. C+ K' I
Before introducing the test specimen, bring the test apparatus, the test specimen support and loading
/ g& g6 v0 I4 C" s7 \8 z9 [: P! |, ^device to the required temperature and maintain them at the required temperature for 24 h or until
4 {$ T2 P" {3 Xequilibrium conditions are reached, whichever occurs sooner. Measure the temperature as close as
" w! f/ I" Z" jpossible to the test specimen.
1 U9 N& x- ]- d# @4 VPlace the test specimen in a forced air convection single cabinet according to sub clauses 4.1.5 and 4.1.6
5 ^. F# R% N, ]! \of IEC 60216-4-1/1990. Support the specimen on a block, such as stainless steel block, with adequate
N) V3 E& W( x% D$ x' n1 J5 R* r( u+ Gdimensions, so that its upper surface is horizontal. Apply the ball pressure apparatus so that the steel ball/ p, A! [7 M. ^/ t
is pressed against the surface with a force of 20 N +/- 0,2 N. Take care to ensure the ball does not move
, K* o% ~5 s3 s7 Rduring the test. After the ball pressure apparatus has been applied for 60 + 2/0 minutes, remove it and
; t9 @! X2 o% f( d- B) Y3 k+ }# dimmerse the test specimen in ambient temperature water within 10 s. Allow the test specimen to cool in
- B7 Z& Y! b h/ e( J9 r: mthe water to approximately room temperature for no longer than 8 minutes and remove all traces of water.
* W; ]& F9 K9 m9 X: f9 LClause 7.2 – Within 3 minutes after removal from the water, measure the diameter of the indentation
v) s" D6 R3 h) U9 C) ?. o& f# M) {caused by the ball to one decimal place. The spherical portion of the indentation to be measured excludes
. B& {, {2 B# \) b1 }0 Q2 D7 gany material deformation around the spherical indentation, as shown in figure 2. In case of doubt, make
+ ~2 }( B5 I4 B5 W0 `, Wtwo further tests and measure the diameter of the indentation to one decimal place; both of these tests shall- A) T9 B* H' s4 ?: i
meet the requirements of clause 9. The result is expressed as pass if the diameter of the indentation(s)
# v) y. g" O6 a% n qdoes not exceed 2,0 mm. The diameter of the indentation caused by the ball is measured by a lens
J [6 V+ x I5 y(approximate magnification of 10x) equipped with a reticule, a cross-travel measuring table and a lighting
" F% T2 T" D8 j" N2 Zdevice to enable the illumination of the surface of the test specimen. For measuring the diameter of the
3 G$ w1 X0 H) B+ \indentation, the reticule is moved from one side to the other.! V# {6 r5 x3 S6 I; g
In case of doubt, other instruments may be used, i.e. microscope or profile projector. In case of nonround
- w3 d5 x0 b8 |; f- l0 v1 zindentation obtained, indicate on the Report the longest measurement observed, maximum
( H0 b/ `! N3 a- G( U2 kallowable difference between the longest and shortest measurement: 0,2 mm.# T: i c8 k6 ]; T2 D5 S% T3 u
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