6 K2 x0 C2 v/ n) B3 M' NStandard(s): IEC 60695-10-2/2003 No. Year 8 X4 h1 U9 h/ t; n3 S4 X2 TCorrigendum 1 (February 2006)" W- a) `/ @3 |5 c
DSH$ C0 X* H2 ~$ l$ M1 a# M# s" n7 a
391.mod. A, j8 r( Q; X( x/ G6 u/ y$ s- a/ O
2009 5 T, ^! f# u' c2 y9 t* O. iCategory: VARIOUS & ?, g! w8 k$ m/ g; Z8 w, `' p* \Subclause(s): 5 – 7.13 B+ a* ~9 ^- ~) ^; H) y. e
Fig. 1 – Fig. 2 M9 J" s7 A3 M: h6 h$ h) x
Developed by: WG4. N" `9 q r, W. k; q
Subject: Ball pressure test K e y w o r d s :, {5 |. _( p: I8 O; [1 `" u6 D
- Lens with a reticule' R: A, [% c2 ^0 ?. x, ]
- Diameter of the& |! e9 S' p) S+ }9 I v
indentation - J3 y7 W' h9 s' U/ G1 u- Steel ball# [7 ?7 d- U6 t" \ N
- Test specimen support- ~& d/ x! K. _8 ^( Y! S
- Loading device / _* _; E( O1 _+ N$ xDecision approved at the, _" n1 d8 @" p/ |0 G' j7 V
46th CTL Plenary Meeting, in; ^: R9 e; _$ o3 d9 ^
2009- M/ h+ n4 q3 Y% y$ O+ P0 R9 Q
Question: : l& O% h0 W( J* ?, q4 TDefine the “best practice” test procedure for ball pressure test consistent with the requirements in 6 P% W# w- V# a% }5 Pthe standard. * X# |8 @" w: j# }/ Q8 {% o z" M+ jDecision: ( p# ~& X# F4 o* D8 o3 x3 N# u( ^Clause 7.1 – Conduct the test in air, in a heating cabinet at the required temperature within a tolerance of # z T. H+ u! Z. J' P+/- 2°C.* W0 ~2 r$ l" H8 Y& e5 Q
Before introducing the test specimen, bring the test apparatus, the test specimen support and loading - C0 g, s3 Y6 F4 H" `" H( ]. {device to the required temperature and maintain them at the required temperature for 24 h or until& K3 T: L! F4 W/ R. N
equilibrium conditions are reached, whichever occurs sooner. Measure the temperature as close as ' E+ E* n. O: k8 v+ Dpossible to the test specimen. * Z0 N' P* K: D. cPlace the test specimen in a forced air convection single cabinet according to sub clauses 4.1.5 and 4.1.69 y$ A4 ^% s$ O0 X3 Q I; m- }* q
of IEC 60216-4-1/1990. Support the specimen on a block, such as stainless steel block, with adequate: Z) d( T1 r. q& S( Y" T7 L
dimensions, so that its upper surface is horizontal. Apply the ball pressure apparatus so that the steel ball ) k3 N }6 B6 R, ~8 E) nis pressed against the surface with a force of 20 N +/- 0,2 N. Take care to ensure the ball does not move ( W8 ~$ e7 W( e8 w6 l0 D5 e" Pduring the test. After the ball pressure apparatus has been applied for 60 + 2/0 minutes, remove it and" F; |$ h) s: J3 _* ?8 Z
immerse the test specimen in ambient temperature water within 10 s. Allow the test specimen to cool in7 w+ \, P: `. v0 v0 ]* \: W
the water to approximately room temperature for no longer than 8 minutes and remove all traces of water.5 {* k E/ `; N5 @1 y y
Clause 7.2 – Within 3 minutes after removal from the water, measure the diameter of the indentation * J, Z& v4 `" ^4 E. S" v( O' Wcaused by the ball to one decimal place. The spherical portion of the indentation to be measured excludes : W+ F0 {' U1 q, Rany material deformation around the spherical indentation, as shown in figure 2. In case of doubt, make5 n' N: h5 o1 _* D$ K F1 F
two further tests and measure the diameter of the indentation to one decimal place; both of these tests shall- D5 p3 V+ J* q7 z0 b% |9 W% D
meet the requirements of clause 9. The result is expressed as pass if the diameter of the indentation(s) ; x- g- k8 a/ B$ }( s1 b. ldoes not exceed 2,0 mm. The diameter of the indentation caused by the ball is measured by a lens 4 h4 b5 T8 F$ K" G1 N) B. z(approximate magnification of 10x) equipped with a reticule, a cross-travel measuring table and a lighting* Y4 F9 n( J" k9 \
device to enable the illumination of the surface of the test specimen. For measuring the diameter of the1 p1 }6 Y- [+ `+ T
indentation, the reticule is moved from one side to the other. : f- q, C6 r; ?& {* v2 Q/ i) e7 FIn case of doubt, other instruments may be used, i.e. microscope or profile projector. In case of nonround 4 f. K' y9 D6 @) G! O& Hindentation obtained, indicate on the Report the longest measurement observed, maximum - f0 ~; Y" T$ i) }7 A; X& Callowable difference between the longest and shortest measurement: 0,2 mm. - c7 w! _9 g u! n% r9 y[attach]77314[/attach] ; Y" s! K# d% {* c5 b3 y
DSH 391.mod. A4 n* e/ A- d# P3 Y) V) U