DSH 791 TRFs – Values to be reported

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DSH 791 & w0 e% k' ~! |2 y

TRFs – Values to be reported - @: A+ |( U8 Q" {

General 7 P  F+ `/ T6 H: a6 t

All IEC standards

Standard(s):
All IEC standards
Subclause(s):
* J2 e. H1 r0 T8 [3 B! PGeneral
, f8 q0 F. w" q" Q7 o4 p2 \No. Year
DSH
0791 2010
) ~; [. k2 `7 ~( G' m. mCategory: VARIOUS Developed by: WG4
; Z. R; ?+ t  }9 d6 k- j* Z, ~Subject:
% k- A7 g4 a* n" sTRFs – Values to be reported
% m' Y) P5 q6 b' |- xKey words:
+ P2 c5 y, }- Y3 ]- _7 @; o7 s5 ~- TRFs
4 V: g1 f, k2 u* S8 S+ W& F# z$ u- Required minimum value
7 L9 N! J7 Z! Y) r- OD-CB2020 Ed. 1.7 § 4.6.1
$ u! W& p6 k2 D1 UApproved at the 48th CTL
9 [' B1 F4 t6 n) `* }Plenary Meeting, in 2011
Question:
% \* v  A$ N; |/ }, d$ Y5 r  Y' QBased on OD-CB2020-Ed.1.7 Sub-clause 4.6.1., it is not allowed to use statements such as “OK”, “meets
the standard”, “more than”, “less than”, or similar instead of the measured value, unless otherwise
specified by CTL.
9 h; C3 K. E) d; @) HIn certain cases the required minimum value is exceeded by a great margin.
Decision:
In case that the measured minimum or maximum value is exceeding or is below the limit value for
0 R1 K2 C1 i6 u2 v( n1 S4 w5 zmore than 30%, the value given in the TRF should be >[minimum required value + 30%] or should
. s3 f% q6 A, L9 Ibe < [maximum required value - 30%]. The accuracy of the used instruments is in line with CTL
; _! s( E# V& t! yDSH 251B or better.
5 H$ r2 j. b+ p0 J7 |For example measurement of insulation resistance:
$ j- X4 K* Z! o3 H  l/ T/ \  c8 d· required
5 M;
· measurement range of test equipment 0 … 10 M;
( Q1 J- s. v* B4 ]- Y0 r( p5 f· the measurement instrument shows full-scale deflexion.
The value given in the TRF should be > 6.5 M
.
/ G/ Z* H4 X  u$ I8 gFor example measurement of creepage distance:
- The required creepage distance is 3.0 mm.;
- The real distance is exceeding 4 mm.;
6 o4 D5 I/ E  e! F  dThe value given in the TRF should be > 4 mm.
, d6 E2 c5 b4 M/ y. {For example measurement of leakage current:
- The current limit is 0.5 mA;
- c9 G% x) g- q+ K* ?- The real current is below 0.35 mA;
* k( X/ w$ K# S& a3 I# KThe value given in the TRF should be < 0.35 mA.
The following two situations are allowed:
1 – The meter reading is less than the smallest measurable graduation on a meter scale. For
8 _4 E# }8 E& U! v/ ^( rexample, touch current measured was less that 0.1 mA.
9 I- M6 j) s, R$ r3 @2 – In checking creepage and clearance distances with a probe the same dimension as the
requirements. For example, creepage and clearance distances were greater than 0.8 mm.
" L5 u# Z! P! e/ s& z1 D* t; @% V) I6 h

/ m& q3 x$ B% J3 I1 q+ Q

zyhua1985

Standard(s):
" Z- H) F9 M6 _7 T' z' Z% eAll IEC standards
) w- f( e- ^" wSubclause(s):
7 W' Z! r. u  a& _! P' O1 E8 vGeneral0 C2 ^7