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| DSH 391C
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| Ball pressure test
/ o' J, b( o4 p | 4, 7, 9, Figure 23 D# T) b* _4 H0 o- j
| 60695-10-2(ed.2)- Y5 w" E, V9 Q2 f: x+ V6 x
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4 Q. ?: j# c3 X( L8 m! BStandard-; f8 J" f. O0 \( Q' Z2 o
IEC 60695-10-2:2003, Ed.2& i, I" H' \! u: N. g
Subclause(s):7 n: i$ X/ ~' N
4$ ]% l0 p7 H% Q: e6 s6 k8 B
7
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0 K* b# ~1 |' C1 dFigure 2
1 e1 ]* `% R1 o" B: kNo. Year
( ]7 K5 Z! f8 e9 zDSH
" w3 P5 v( \" z1 j5 b s1 h0391C 2010 w; [8 @! C* r4 u
Category:6 V* T5 c* o4 t" Z4 {
VARIOUS, GENERAL7 |' ~$ P2 n, h& z Y
Developed by:! j t' Q+ `0 r; ^% n, `) B8 j8 Q/ k
CTL-WG2 + WG4
/ U/ q; N8 L- e4 o/ x7 x2 DSubject:
/ m( ^" w: E$ hBall pressure test* ^! c9 j1 s* B( X% W; V, Y
Key words:6 P5 |8 ^* @3 y3 V# ?$ n
-Diameter of indentation
1 M# @) x" T0 K$ {0 ]; T-Pressure Ball8 v' K9 B2 g `: s0 \5 h
-Test Specimen Support" v2 b1 l; w/ `: o: w; M0 H* z6 K
Approved at the 48th CTL, \! f# s& Q# E. s
Plenary Meeting, year
0 o2 k4 Q. b0 n; Y2011. a2 a$ g t" [5 J! k; A3 B' g
Replaces DSH 391 and, F( }3 @- a, L# p: s/ x
DSH 391mod.
& {1 M( [- z( Z$ Y. WQuestion:* O0 R3 u L. p/ w3 \
Define the “best practice” test procedure for the ball pressure test based on the
0 w" x6 E6 J& L4 Srequirements of the standard, and for practical reasons also based on 89/1011/CD, which
6 k! A8 W5 p( @4 K3 Ais not in all respects identical with the requirements of the standard.7 N5 p; p/ o# a5 S' h3 G- u
Decision:
& }- a! }' |( O& ^In addition to clause 4.1 of the standard and due to various qualities of steel balls for rolling5 a v6 c9 Z _4 b r1 L
bearings, the tolerance for the steel ball diameter shall not exceed ±1% to ensure
9 E. d; t e* k$ ~& [comparable results.
( h8 n6 I+ i! Q6 dIn addition to clause 4.2 of the standard, the specimen support shall be a metal block of
9 E( ?9 L& A- T; G+ o7 ]steel, with a diameter 50 mm and a height of 100 mm or equivalent volume and mass.
8 [" u2 k2 d6 H7 w- p7 ~3 |In addition to 4.3 of the standard, a forced air convection single cabinet according to IEC
( w1 B9 c6 k! O q60216-4-1:1990, clauses 4.1.5 and 4.1.6 shall be used.+ C$ K3 _8 T0 Q/ @
In addition to 7.1 of the standard conduct the test in air, in a heating cabinet being capable to: R1 A/ Q1 K. Q* J( y
return within 5 min and without any temperature overshoot exceeding +5°C to the* z* [2 O& }0 F+ K; m
previously adjusted and required air temperature within a tolerance of +/- 2°C .- _" ]* {7 s9 R; t0 ?
Measure the air temperature as close as possible to the test specimen.
) p4 L! B( t- h3 aBefore introducing the test specimen, bring the cabinet, the test apparatus and the test' z1 M+ ~1 h) `2 a4 o
specimen support to the required temperature and maintain the required test temperature for
3 g6 i- |# ]9 W1 X24 h or until equilibrium conditions are reached, whichever occurs sooner.
9 E. m% o. {; S& w4 }When thermal equilibrium conditions are reached, place the test specimen on the approximate1 i+ M& i4 E: m- L5 O
centre of the test specimen support so that its upper surface is horizontal. Gently lower the
: D: m( j) P; L2 h7 d2 m2 cpressure ball on to the approximate centre of the test specimen. Ensure that no conditions exist
( [) {! x" b2 M/ [that will cause the pressure ball to move other than in a downward direction during the test.
4 H8 U9 p. r8 IAfter the ball pressure apparatus has been applied for 60 +2/-0 minutes, remove it and within 10/ p1 {) X- @4 ]4 _2 c' I3 Q2 T. j
s immerse the test specimen in ambient temperature water for 6 min ±2 min." g0 q" ]" i' G9 S# F7 }/ j3 s4 E
Within 3 minutes of removal from the water, measure the diameter of the indentation caused by( \) |: y$ H/ U' U
the pressure ball to one decimal place.
7 d8 r; H v1 ^* Y2 k/ CDeviant from 7.2 of the standard, but in accordance with 89/1011/CD, the diameter “d” of
$ L" Y. J' z" E+ w$ x# Nthe indentation is to be measured as close as possible to the diameter of the “solid edge”( m, G% v+ h5 `0 z' t H* y& V2 G+ p
of the indentation according to both a) figure 2a shown below and b) picture examples2 {. E _* g9 Z/ D8 Q u) C, U5 H$ U
given in Annex A. The diameter of the solid edge of the indentation (dimension d ) shall6 _9 x7 K! y/ B* K' E
exclude any material deformation as shown in figure 2c below.
/ s1 ?, c7 b: z2 V7 C& o6 v4 k5 a4 {, `7 P9 R0 {; c
8 @ e/ r D& }0 y9 B0 |& b
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