DSH 791 TRFs – Values to be reported

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DSH 791 9 X6 u9 l5 `' ~8 A

TRFs – Values to be reported 4 w3 S7 {! ~# I9 J$ x

General

All IEC standards 4 K" V' ?* s1 d: j' [3 d$ n

Standard(s):
+ I' R" S1 L" z$ s5 ?All IEC standards
Subclause(s):
General
No. Year
DSH
" d1 l* x8 ~- {% m' O5 h% ^0791 2010
2 O  c: o" V4 OCategory: VARIOUS Developed by: WG4
Subject:
# |. A, l7 a* }& m- zTRFs – Values to be reported
Key words:
% Z% a5 I  h; g- TRFs
- Required minimum value
% Y9 m  ~9 J& x+ Y- OD-CB2020 Ed. 1.7 § 4.6.1
, v+ E. q4 v0 u3 c% l% A/ |* jApproved at the 48th CTL
1 @! b& O5 W# M( JPlenary Meeting, in 2011
Question:
/ Z! `2 x% p+ BBased on OD-CB2020-Ed.1.7 Sub-clause 4.6.1., it is not allowed to use statements such as “OK”, “meets
! t) {$ M9 Y: B& S/ hthe standard”, “more than”, “less than”, or similar instead of the measured value, unless otherwise
specified by CTL.
: P3 x5 G9 V7 P. i! n1 x" ZIn certain cases the required minimum value is exceeded by a great margin.
4 H- ~! Z4 k5 d# Y/ S" ?Decision:
In case that the measured minimum or maximum value is exceeding or is below the limit value for
more than 30%, the value given in the TRF should be >[minimum required value + 30%] or should
be < [maximum required value - 30%]. The accuracy of the used instruments is in line with CTL
7 O1 d, H2 O, _* g- B& ]2 ]DSH 251B or better.
  d1 H2 \# C6 k( d' `7 CFor example measurement of insulation resistance:
· required
5 M;
: K$ k/ S$ S) W; u/ u· measurement range of test equipment 0 … 10 M;
* ]! T  X6 x2 y4 t# l· the measurement instrument shows full-scale deflexion.
! x4 {/ ~. j6 k) {4 hThe value given in the TRF should be > 6.5 M
.
- d2 v* F: N, ^  S. u+ gFor example measurement of creepage distance:
. B3 K% `- Q7 }% f; ?; t" T7 m- The required creepage distance is 3.0 mm.;
! z6 _: v3 A0 b! k+ F; G- The real distance is exceeding 4 mm.;
The value given in the TRF should be > 4 mm.
For example measurement of leakage current:
- The current limit is 0.5 mA;
& p: q/ o! Q4 R& f- The real current is below 0.35 mA;
The value given in the TRF should be < 0.35 mA.
2 i- @4 i5 D  l' O" cThe following two situations are allowed:
1 – The meter reading is less than the smallest measurable graduation on a meter scale. For
example, touch current measured was less that 0.1 mA.
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.

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Standard(s):
4 h6 Z3 U( ?' C( H- F* AAll IEC standards
2 C! ~/ H* R' a0 M: {Subclause(s):
% S3 f; z, p  V# ]General0 C2 ^7