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|  DSH 791& A: z# g# r( L" }4 J; A
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| TRFs – Values to be reported
# f& M6 l: J `9 G7 K* \' { | General
, j, `, ]6 S3 N- H# L, K7 ] | All IEC standards
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Standard(s):- \9 ?+ s5 L) ~- @0 _
All IEC standards) t) ~2 h Y5 z( X: r
Subclause(s):
6 d) U3 h6 c' {: x6 i0 N# M8 U/ @General
3 L1 W! M! A2 n. x7 gNo. Year" Y! e2 r& ?% X& |# d& T9 x
DSH1 C* C) T8 M5 b! \; r- B* O7 l- A: B
0791 2010
! G& q% j1 O5 Z4 j4 E; N6 N! UCategory: VARIOUS Developed by: WG4# h/ ?& ?6 i3 I
Subject:
) { N9 d, t; z, v1 [: ]3 JTRFs – Values to be reported) ?* l7 `8 o! n' d. b" e
Key words:9 C' M4 x7 o7 G
- TRFs1 t" j( a5 m" i3 ~, w0 D* `- f8 @! \' Z
- Required minimum value
0 r; N( T; E* v5 p( b- OD-CB2020 Ed. 1.7 § 4.6.17 y3 U! n% |7 _, d6 z
Approved at the 48th CTL
. { ^6 _% ?4 Z, CPlenary Meeting, in 2011 z' G3 m; ~0 M M; J3 Z D* v. _
Question:5 @6 a" y# i' L/ \) U9 v& s9 d
Based on OD-CB2020-Ed.1.7 Sub-clause 4.6.1., it is not allowed to use statements such as “OK”, “meets" R. B* @# }$ j: g
the standard”, “more than”, “less than”, or similar instead of the measured value, unless otherwise) [) w F+ b& G$ P+ C* @" Z1 K6 R
specified by CTL.
1 r+ l3 F5 \! L/ W- o, N" fIn certain cases the required minimum value is exceeded by a great margin.
2 [ m" R) S: hDecision:9 C" f5 C6 v% s5 u% c U
In case that the measured minimum or maximum value is exceeding or is below the limit value for
! ]7 ~# U# E6 ~4 X6 F+ w0 {more than 30%, the value given in the TRF should be >[minimum required value + 30%] or should
& p9 }* X) ?0 z' _7 u% d4 Pbe < [maximum required value - 30%]. The accuracy of the used instruments is in line with CTL
4 E# U O$ a R E6 ~# W7 vDSH 251B or better.$ |/ ]* Z, j7 T7 ~( H
For example measurement of insulation resistance:( c' D. N/ k$ L7 t; A
· required 5 M;" R( ^+ w% s9 n. [( z
· measurement range of test equipment 0 … 10 M;. u0 M! g4 }6 B% K3 E ]4 J9 V
· the measurement instrument shows full-scale deflexion.
9 W% P L& |! f) V! d- e9 u# r; VThe value given in the TRF should be > 6.5 M.
7 }$ K% X5 {8 Y* u8 o( KFor example measurement of creepage distance:- j% W" G5 J4 s1 O4 C5 u$ D
- The required creepage distance is 3.0 mm.;4 I5 r) l f! @& A3 e
- The real distance is exceeding 4 mm.;, V+ p8 `1 c' S5 q
The value given in the TRF should be > 4 mm., z* Z0 t; h; {4 u# s) k$ X2 r( h
For example measurement of leakage current:
+ }& J9 ]% T4 L/ t+ z" M7 y) z- The current limit is 0.5 mA;( |) o, p7 Z. m
- The real current is below 0.35 mA;
8 W6 |$ k$ ^2 y7 y2 cThe value given in the TRF should be < 0.35 mA.1 i. E+ b, k! q3 _( n, q
The following two situations are allowed:3 `0 ^# J* d+ k" V1 _' {& C( d
1 – The meter reading is less than the smallest measurable graduation on a meter scale. For
* r$ w9 N4 z0 c3 ?/ X- Vexample, touch current measured was less that 0.1 mA.% S" M' C" B) ^2 j9 a, G9 D
2 – In checking creepage and clearance distances with a probe the same dimension as the
7 ]/ h6 g4 ]) s, r9 Crequirements. For example, creepage and clearance distances were greater than 0.8 mm./ |; z; @6 R1 C `6 r" B5 B
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