DSH 791 TRFs – Values to be reported

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DSH 791 . ^' {  G' c5 H: B; C5 S( c 9 W- V3 [, ~4 B& M

TRFs – Values to be reported 5 p7 _. G  }0 D* K, s% H

General ; m2 V: x! W$ i# E/ j

All IEC standards

Standard(s):
2 A, ~6 e  n9 z- I' cAll IEC standards
5 S2 g' o- {8 a& F2 FSubclause(s):
General
0 d" N$ n& V2 E+ o( [No. Year
DSH
0791 2010
. g- _2 E$ H, O) e! z7 J# _Category: VARIOUS Developed by: WG4
( f* ^/ Q2 y# Z0 }) r2 R! y+ GSubject:
TRFs – Values to be reported
Key words:
- TRFs
' l) ]/ c1 E+ Z' _! D* e! g- Required minimum value
5 k$ d% ~* Y+ B% r: U- OD-CB2020 Ed. 1.7 § 4.6.1
! T) |% u( Y4 z$ c# zApproved at the 48th CTL
Plenary Meeting, in 2011
Question:
Based on OD-CB2020-Ed.1.7 Sub-clause 4.6.1., it is not allowed to use statements such as “OK”, “meets
7 n9 A! j% d, q& ~% C) O/ `the standard”, “more than”, “less than”, or similar instead of the measured value, unless otherwise
specified by CTL.
In certain cases the required minimum value is exceeded by a great margin.
7 B" ~5 l+ J- oDecision:
In case that the measured minimum or maximum value is exceeding or is below the limit value for
* O% F) J$ _5 T* m( U+ omore than 30%, the value given in the TRF should be >[minimum required value + 30%] or should
: N- m+ ~1 `# L# ]0 G% I/ ube < [maximum required value - 30%]. The accuracy of the used instruments is in line with CTL
DSH 251B or better.
9 ~- }& H- R' D  G( l& MFor example measurement of insulation resistance:
! o. W3 j0 `' J& O- Z· required
5 M;
* ^" L$ Y; v+ l8 F  J- b· measurement range of test equipment 0 … 10 M;
/ p& \. _# J1 u; D7 w· the measurement instrument shows full-scale deflexion.
* {% }' j) C) N2 o- ^The value given in the TRF should be > 6.5 M
.
* ^0 C. f& f$ P1 d  J- ]# p% t9 WFor example measurement of creepage distance:
: L0 M4 S( T4 _; v( D) R- The required creepage distance is 3.0 mm.;
- The real distance is exceeding 4 mm.;
6 g9 W! o2 e1 p1 ?' P0 c- dThe value given in the TRF should be > 4 mm.
# Q2 N# ~+ {, NFor example measurement of leakage current:
- The current limit is 0.5 mA;
& H4 _9 @; V% G: b4 _- F- The real current is below 0.35 mA;
2 j+ t8 w7 Y6 G0 J7 P6 P! tThe value given in the TRF should be < 0.35 mA.
6 x- w5 F: J% R; _" T5 JThe following two situations are allowed:
% P6 i* \+ Y- z1 – The meter reading is less than the smallest measurable graduation on a meter scale. For
8 S' X1 }( F+ q# ^/ {/ nexample, touch current measured was less that 0.1 mA.
. r2 |+ X. l/ W$ G- ^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.

zyhua1985

Standard(s):
. J* P9 |$ B& _- B2 P* RAll IEC standards
Subclause(s):
General0 C2 ^7