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| DSH 391.mod. A) f% e3 T. f; f. }$ o
& w( l' O6 M) n6 `+ F | Ball pressure test& B6 V. {* W+ ~' B
| 5 – 7.1, Fig. 1 – Fig. 2
7 j! v- V n! K t | 60695-10-2(ed.1)0 k4 I& q. q) Y; g# m( C5 n6 N
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% j- Z6 m' q. j7 O5 b6 YStandard(s): IEC 60695-10-2/2003 No. Year
8 `7 U; Z' ~" A! z- x" tCorrigendum 1 (February 2006)
0 F6 u* T% o/ V0 EDSH
; y4 @ c. t/ v, o" m; b, ~' K391.mod. A
. X1 w5 [ m1 y6 r20098 R6 v2 y! w+ h% c* l$ U" L
Category: VARIOUS. {9 L( D; }# Z" [) x
Subclause(s): 5 – 7.1
; _ a) N9 \0 iFig. 1 – Fig. 2/ K+ j6 n- X# k6 `
Developed by: WG4
( j- z- r6 c/ s" G% ]' @2 F$ VSubject: Ball pressure test K e y w o r d s :
9 @! U+ j' P' \- l, V- Lens with a reticule S' d5 ?# D' @# X/ S* s
- Diameter of the
! s3 E$ ~. P5 { B! }+ t. q: P5 U* lindentation5 w: M- @) J# O& s: C
- Steel ball1 m7 j3 g6 A: T: C
- Test specimen support W! V. F5 c% |! K" z
- Loading device
5 R" T0 A" F4 k0 F7 e+ k7 M8 y2 MDecision approved at the
6 S1 ?& e [1 h3 K4 X* y% X! V46th CTL Plenary Meeting, in. {, c n0 d5 w( ?6 z' o
20094 b3 ~8 U* H: R% g- X6 L- h
Question:( e' V W9 @) Y* o3 h4 l" ~1 [- ^( H
Define the “best practice” test procedure for ball pressure test consistent with the requirements in
7 l6 c/ v' R0 k! C0 ]; g. Kthe standard.
8 ?$ Q5 Z, F* O8 e0 {8 }Decision:8 e0 z) C1 ]6 G7 Q5 m
Clause 7.1 – Conduct the test in air, in a heating cabinet at the required temperature within a tolerance of
( e- m$ R9 K0 g* }9 O) J+/- 2°C.
& j; B" ~/ ^4 P9 e+ O& z- B% X3 SBefore introducing the test specimen, bring the test apparatus, the test specimen support and loading! U$ Y( s% n. ]# u; ?
device to the required temperature and maintain them at the required temperature for 24 h or until
( S6 h' Q1 `8 gequilibrium conditions are reached, whichever occurs sooner. Measure the temperature as close as
- {6 C, \( G( D2 v: Z9 h# `* Tpossible to the test specimen.* O7 f# y! E# J
Place the test specimen in a forced air convection single cabinet according to sub clauses 4.1.5 and 4.1.6
0 m; i( v: B m1 Xof IEC 60216-4-1/1990. Support the specimen on a block, such as stainless steel block, with adequate; o4 y/ r j$ k+ l x# v4 `" F
dimensions, so that its upper surface is horizontal. Apply the ball pressure apparatus so that the steel ball
0 U( A& y# S+ G, @% \/ ris pressed against the surface with a force of 20 N +/- 0,2 N. Take care to ensure the ball does not move' ` j8 a" }! P
during the test. After the ball pressure apparatus has been applied for 60 + 2/0 minutes, remove it and
. _* z8 [! @$ k3 @ Uimmerse the test specimen in ambient temperature water within 10 s. Allow the test specimen to cool in- g; U4 o- N$ I; m% K
the water to approximately room temperature for no longer than 8 minutes and remove all traces of water.8 O3 `7 J- a, G( a# r4 ~* j
Clause 7.2 – Within 3 minutes after removal from the water, measure the diameter of the indentation
, c1 b! g% `. q/ `6 s& hcaused by the ball to one decimal place. The spherical portion of the indentation to be measured excludes
6 I6 W- L0 Z! k8 ?; X' Vany material deformation around the spherical indentation, as shown in figure 2. In case of doubt, make0 ^, U Q5 M. Y% x. X: O! }0 ~
two further tests and measure the diameter of the indentation to one decimal place; both of these tests shall8 d2 A+ w: |8 E6 ?/ K, m
meet the requirements of clause 9. The result is expressed as pass if the diameter of the indentation(s)
, K" y* k/ w& ]+ i8 |$ O1 ldoes not exceed 2,0 mm. The diameter of the indentation caused by the ball is measured by a lens
" j4 q1 X- A9 N1 q(approximate magnification of 10x) equipped with a reticule, a cross-travel measuring table and a lighting8 r1 I, g; a6 x8 m
device to enable the illumination of the surface of the test specimen. For measuring the diameter of the
4 z* ~: V, }$ \2 L2 p1 A" {indentation, the reticule is moved from one side to the other.
; o {' Q; ?4 q2 c% J5 y0 fIn case of doubt, other instruments may be used, i.e. microscope or profile projector. In case of nonround
9 [2 b5 z e( [# Vindentation obtained, indicate on the Report the longest measurement observed, maximum2 R$ Q. V1 a" v: V- w6 f: U4 A
allowable difference between the longest and shortest measurement: 0,2 mm.! S/ `' w. S- i0 ?2 F
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