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| DSH 391C
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| Ball pressure test
+ w! e% A% w9 w3 X# O | 4, 7, 9, Figure 2% T4 o B3 h1 C9 ~: s6 H- O7 c6 T' P8 G
| 60695-10-2(ed.2)- `& R/ b2 s/ q# l8 Y+ a8 T+ P
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Standard-) J8 r, b u8 N C% m
IEC 60695-10-2:2003, Ed.2
& J) q! H3 T/ e- v6 S- W) k2 QSubclause(s):
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9
3 l- \/ r2 X: ]% e7 M4 oFigure 2* a' |. D) r3 l1 q
No. Year
# A1 a! m& L; t6 m5 O0 k+ a4 tDSH
* [2 \! R! v \- k0391C 2010
$ i7 g6 C) I! F" R0 J/ ^Category:) K( N6 c7 U7 L8 R
VARIOUS, GENERAL
: |- N% v' f! }" |' m, HDeveloped by:" h5 g# h4 K* ~; G7 A% \1 i
CTL-WG2 + WG4
, }2 Z! k: J' B- n7 I. X8 _Subject:9 k& B+ s( |# U( ?3 [$ Z5 r
Ball pressure test: Y. A; F- I; u6 I/ M5 D3 T" {
Key words:' r# q. H; T: N
-Diameter of indentation
( Y( ?1 S0 F: G$ L! \& {1 K-Pressure Ball- t: a3 e6 U3 j# H6 h- s
-Test Specimen Support
$ y9 A8 @- @8 G" \; BApproved at the 48th CTL
+ w8 b) R: ] B% E. \) V+ RPlenary Meeting, year
8 k* r& g# w9 D$ u f2 H# O2011.3 V6 t9 p6 C$ t8 F) D+ D/ G
Replaces DSH 391 and( C; \& F7 z% Q& H" z: E, p) g
DSH 391mod.+ @- J! _4 Z# ~! Z
Question:
: j- \. o* H' g9 ?3 q+ w/ b" @Define the “best practice” test procedure for the ball pressure test based on the& u! W, f2 u9 |8 b ]
requirements of the standard, and for practical reasons also based on 89/1011/CD, which
; {* {: |4 [$ o- _7 Uis not in all respects identical with the requirements of the standard.: }& r& {- }! L1 o
Decision:
; h' q2 f7 B% Y3 i$ |5 \In addition to clause 4.1 of the standard and due to various qualities of steel balls for rolling1 R2 h- n9 U ^8 A
bearings, the tolerance for the steel ball diameter shall not exceed ±1% to ensure9 _7 t2 d2 ?! g1 L* J
comparable results.5 V4 O/ h/ o/ P
In addition to clause 4.2 of the standard, the specimen support shall be a metal block of
! ]; }) j7 I& S* ~* ^5 fsteel, with a diameter 50 mm and a height of 100 mm or equivalent volume and mass.
3 r% V* W, D7 A T# \+ L) KIn addition to 4.3 of the standard, a forced air convection single cabinet according to IEC' S2 \8 p6 ]. V! t0 q
60216-4-1:1990, clauses 4.1.5 and 4.1.6 shall be used.! F ?8 F8 i. G9 G6 P( o# z# M# D
In addition to 7.1 of the standard conduct the test in air, in a heating cabinet being capable to, v: F. g5 K. e7 m" c0 b
return within 5 min and without any temperature overshoot exceeding +5°C to the( l4 e9 [( s4 P5 S+ X
previously adjusted and required air temperature within a tolerance of +/- 2°C ." I. I& l- ?; W8 l6 `
Measure the air temperature as close as possible to the test specimen.- w2 q+ g! J: B5 f+ E
Before introducing the test specimen, bring the cabinet, the test apparatus and the test+ h @1 j r8 A7 S6 z$ B- F: C! x
specimen support to the required temperature and maintain the required test temperature for4 |; {# p9 V- S
24 h or until equilibrium conditions are reached, whichever occurs sooner.
~" B4 o+ s8 z/ x" M3 P/ IWhen thermal equilibrium conditions are reached, place the test specimen on the approximate
6 m& }6 `: Q; ~: `4 w7 ~! ]centre of the test specimen support so that its upper surface is horizontal. Gently lower the
1 l! _. s x% s/ W/ y# p- k) _pressure ball on to the approximate centre of the test specimen. Ensure that no conditions exist/ P. N! i I' v- }7 z
that will cause the pressure ball to move other than in a downward direction during the test.
0 h k n/ T; K* n+ M; a! a/ o$ K7 sAfter the ball pressure apparatus has been applied for 60 +2/-0 minutes, remove it and within 10. P- U4 }4 t8 S8 T' P4 L
s immerse the test specimen in ambient temperature water for 6 min ±2 min.
- `* w) y: T$ L' g, t, X/ n' U+ wWithin 3 minutes of removal from the water, measure the diameter of the indentation caused by! o4 |: ^. o. u C5 d! ^
the pressure ball to one decimal place.- @' n- V. O- f4 \6 a
Deviant from 7.2 of the standard, but in accordance with 89/1011/CD, the diameter “d” of) r; ?% F) K: K5 i
the indentation is to be measured as close as possible to the diameter of the “solid edge”( r( L, \; s: X4 K' s" Y
of the indentation according to both a) figure 2a shown below and b) picture examples
/ J/ _" P8 w: ~% l- r/ }; W5 w Ugiven in Annex A. The diameter of the solid edge of the indentation (dimension d ) shall
& ^9 }% V. d" s/ eexclude any material deformation as shown in figure 2c below.
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