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| DSH 391C: m5 C. R! e# d9 K
+ q$ F" F# Z- \" I | Ball pressure test
* U% K; k1 }) k1 ~6 k6 l% H | 4, 7, 9, Figure 2
+ b! J2 |, x! a5 k | 60695-10-2(ed.2)9 }2 }( T: c: n7 @3 m$ U
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Standard-
: T9 O( E. D0 p. K4 x$ iIEC 60695-10-2:2003, Ed.23 p: R( {; ^+ u; x' z
Subclause(s):" U% C2 j; S) r3 ]; \( G
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Figure 2
}0 b' U% p5 N8 y& M3 N+ Z1 RNo. Year
, O3 K& ?! _2 z" O8 b- QDSH$ b, e7 [% ]) h( j" `4 s% [- W3 F
0391C 2010
5 j/ F( o: x& i. G7 OCategory:* h9 S% d# T4 l* \3 ^8 m* s2 H) i
VARIOUS, GENERAL3 U+ b; k j& _
Developed by:
~$ W8 e3 x3 kCTL-WG2 + WG4
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Ball pressure test; M0 p2 u( X- h0 p" a
Key words:
A3 c3 N& k/ W. C2 K4 q" M-Diameter of indentation+ M" x; n" H- C5 g5 W9 m$ r
-Pressure Ball
2 N( N% ]$ a- H4 P" i9 W-Test Specimen Support) N( x$ d- i" v8 S/ d9 H
Approved at the 48th CTL
) R3 w) ?7 o. FPlenary Meeting, year
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Replaces DSH 391 and
4 ~- L f7 i/ `DSH 391mod.
% R$ H& `( {* i, V# SQuestion:$ n0 Q$ U8 i" D$ k
Define the “best practice” test procedure for the ball pressure test based on the
( I- p- K" @6 u8 a) {& {requirements of the standard, and for practical reasons also based on 89/1011/CD, which
/ b6 ^7 Q' ?1 n6 v1 `$ t1 his not in all respects identical with the requirements of the standard.
( U; \1 ]' H5 D. X3 \' ?( t y0 GDecision:. o( R" H8 q4 `9 V
In addition to clause 4.1 of the standard and due to various qualities of steel balls for rolling3 T' _+ v- Z+ |
bearings, the tolerance for the steel ball diameter shall not exceed ±1% to ensure
. [* V, f9 i5 k3 Bcomparable results.1 C3 C, S7 y ~* Q
In addition to clause 4.2 of the standard, the specimen support shall be a metal block of. n" f* z# m2 G/ t( Q' h
steel, with a diameter 50 mm and a height of 100 mm or equivalent volume and mass.5 b4 E' D+ m. m$ L5 @6 n5 W
In addition to 4.3 of the standard, a forced air convection single cabinet according to IEC7 u1 V& i( [" `5 }0 ?5 d, @# r% q
60216-4-1:1990, clauses 4.1.5 and 4.1.6 shall be used.2 Z( j- S. b% ]2 a4 c+ l& Q
In addition to 7.1 of the standard conduct the test in air, in a heating cabinet being capable to
9 \' H( w3 u- x8 ]4 lreturn within 5 min and without any temperature overshoot exceeding +5°C to the, W2 o i- f, Y- ], v$ K9 M
previously adjusted and required air temperature within a tolerance of +/- 2°C .
7 P) i2 A9 z) `, |4 bMeasure the air temperature as close as possible to the test specimen.
& O# i; C; n9 ?- D& g# A. I9 tBefore introducing the test specimen, bring the cabinet, the test apparatus and the test
8 f. S$ A$ M9 [6 Lspecimen support to the required temperature and maintain the required test temperature for7 l; [" n' b5 A% ?3 E6 Y
24 h or until equilibrium conditions are reached, whichever occurs sooner. J! j8 |) y7 Y. l$ k; |
When thermal equilibrium conditions are reached, place the test specimen on the approximate! M# O$ c0 L, A2 z: h
centre of the test specimen support so that its upper surface is horizontal. Gently lower the1 U# |* S7 ]% L4 K2 u
pressure ball on to the approximate centre of the test specimen. Ensure that no conditions exist1 ?" a8 _+ ^ H# R
that will cause the pressure ball to move other than in a downward direction during the test.
* P+ R+ C7 |4 `: h+ S3 lAfter the ball pressure apparatus has been applied for 60 +2/-0 minutes, remove it and within 10
3 A2 H2 ^$ O' ?9 Ns immerse the test specimen in ambient temperature water for 6 min ±2 min.6 a+ y' E5 [9 @. U, [1 c
Within 3 minutes of removal from the water, measure the diameter of the indentation caused by
! I6 S* a& _: }4 A% v5 f* P, lthe pressure ball to one decimal place.+ r; u% R G6 s( N, K* r+ [
Deviant from 7.2 of the standard, but in accordance with 89/1011/CD, the diameter “d” of
& d. B; X5 l2 u: y; w& o7 Uthe indentation is to be measured as close as possible to the diameter of the “solid edge”
/ T# L0 w9 f* L& }. g$ _, ~of the indentation according to both a) figure 2a shown below and b) picture examples
% C3 V3 j" m8 G: sgiven in Annex A. The diameter of the solid edge of the indentation (dimension d ) shall
7 L/ ~' O! z$ O/ Z" u% \exclude any material deformation as shown in figure 2c below.. ?9 H( b' V9 q- n5 x/ W* Q+ q
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