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| DSH 391C
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| Ball pressure test
8 O' y1 P. D- k# J( Z | 4, 7, 9, Figure 2" n, x" s* h8 A. D/ |/ v. H
| 60695-10-2(ed.2)6 J8 e' R) i5 \8 k
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Standard-8 O0 w7 Q' p) v3 B F1 N; b! `; R
IEC 60695-10-2:2003, Ed.2; p" W$ h/ Y4 F) ?# g- L6 L
Subclause(s):
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5 D ^7 r7 ^0 A6 i+ o+ K+ xFigure 2% o2 h/ C. q) g* F
No. Year
! {# P" _7 e8 z% G- SDSH) ]" \( T% x& ?3 a. }8 l4 W0 Z7 B
0391C 2010
" V- A: D: w5 j$ }! e$ g6 BCategory:9 i8 u+ X0 y+ a+ D
VARIOUS, GENERAL% s* D* I3 e* c+ Z1 I1 p
Developed by:$ w$ i7 E4 \. _* o' u) [
CTL-WG2 + WG4
7 f$ o( b0 Z/ t: w9 b& [, S7 c3 NSubject:- y: W# n- a N! u5 R! {7 c2 K
Ball pressure test2 j6 ^) t* s4 B. K% ^0 v$ C
Key words:
5 G4 O8 J3 j2 [3 n0 R+ D7 v) C( o-Diameter of indentation1 v8 F: u+ B" r6 Z* V
-Pressure Ball. H0 O5 F1 G# N
-Test Specimen Support7 L4 I; r# z6 A8 m( w
Approved at the 48th CTL
4 p K, I ]! Z# S+ Y% X7 O. H5 bPlenary Meeting, year! y. T0 v+ ` f3 p5 C% X& x
2011.
u; h ~3 Y9 o+ V+ mReplaces DSH 391 and0 u L& h, V6 M2 J) x K1 M1 _( t
DSH 391mod.
- g/ }8 u' B8 f9 c# s. q7 f2 i! `' {/ fQuestion:
* S! q* X: Q8 Z! |+ f, vDefine the “best practice” test procedure for the ball pressure test based on the8 E: x/ p9 J' k9 l5 t" F" H
requirements of the standard, and for practical reasons also based on 89/1011/CD, which
2 q4 Y" G: Q+ f9 X6 ~7 x$ Nis not in all respects identical with the requirements of the standard.
7 u* m# W; Y/ g! e4 `0 W* UDecision:
7 ?" t2 F8 o$ ^( P5 v3 hIn addition to clause 4.1 of the standard and due to various qualities of steel balls for rolling
9 ]; q4 j+ x V' p5 O2 K& O. ubearings, the tolerance for the steel ball diameter shall not exceed ±1% to ensure
( a( F/ o( R( d! @comparable results.5 ]5 P4 h( n2 s- J! L
In addition to clause 4.2 of the standard, the specimen support shall be a metal block of
& d- L' t; J) c" y4 [steel, with a diameter 50 mm and a height of 100 mm or equivalent volume and mass.: t( j- o( X% L [. `3 G6 h
In addition to 4.3 of the standard, a forced air convection single cabinet according to IEC
/ ], J+ C; k8 h" y0 n7 T+ B60216-4-1:1990, clauses 4.1.5 and 4.1.6 shall be used.. \5 {/ ]: ~8 J6 e
In addition to 7.1 of the standard conduct the test in air, in a heating cabinet being capable to- {6 ]7 k. s) G! T
return within 5 min and without any temperature overshoot exceeding +5°C to the8 E6 n% S( Z2 @; Q2 D9 C
previously adjusted and required air temperature within a tolerance of +/- 2°C .' h$ y. Z3 ^$ v* d; {
Measure the air temperature as close as possible to the test specimen.
. j& i! T q9 R3 d1 tBefore introducing the test specimen, bring the cabinet, the test apparatus and the test
2 P2 p* Y- V' ^# vspecimen support to the required temperature and maintain the required test temperature for
4 w; l0 g: p @8 V+ N% I6 i24 h or until equilibrium conditions are reached, whichever occurs sooner.8 d3 D" t0 Z1 g. R
When thermal equilibrium conditions are reached, place the test specimen on the approximate) Y/ i- O0 N& Z7 I3 _
centre of the test specimen support so that its upper surface is horizontal. Gently lower the
( _4 z5 B& N9 mpressure ball on to the approximate centre of the test specimen. Ensure that no conditions exist
1 n6 T/ x' N! Dthat will cause the pressure ball to move other than in a downward direction during the test.
0 T7 A1 g+ h$ V* H K7 R, [After the ball pressure apparatus has been applied for 60 +2/-0 minutes, remove it and within 10" G. e" P- m$ }* Z6 V! C+ E% Q( c# B
s immerse the test specimen in ambient temperature water for 6 min ±2 min.2 a6 r- o( r: b3 ~# \% I
Within 3 minutes of removal from the water, measure the diameter of the indentation caused by
- h4 G1 j& B# F) Ethe pressure ball to one decimal place.5 v1 Q3 ~2 \) Y1 T8 T! Q
Deviant from 7.2 of the standard, but in accordance with 89/1011/CD, the diameter “d” of+ f7 H3 S3 i8 W# R2 I
the indentation is to be measured as close as possible to the diameter of the “solid edge”( M+ p+ U! ^3 w7 |9 ]& f
of the indentation according to both a) figure 2a shown below and b) picture examples
/ l" F, e: X) ~0 egiven in Annex A. The diameter of the solid edge of the indentation (dimension d ) shall
$ ?1 H5 W) g8 Rexclude any material deformation as shown in figure 2c below.
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