DSH 791 TRFs – Values to be reported

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DSH 791 % M9 U3 q) h( I' W/ ~" O: j' f' {

TRFs – Values to be reported * A8 z( f5 x6 q

General 1 y3 D: Z- p5 p- R$ t

All IEC standards

* x' p; Z, |  B8 S. L3 FStandard(s):
All IEC standards
7 |& H7 w# }% N( O, m: a) R! ASubclause(s):
General
( B1 S; Z* K4 O, S& o! vNo. Year
& u, v. D. {7 g; Y) x7 M) n: pDSH
0791 2010
Category: VARIOUS Developed by: WG4
Subject:
! y9 a7 G: s8 w% z7 @) y" OTRFs – Values to be reported
Key words:
2 ]  z8 m2 P& b- TRFs
- Required minimum value
- OD-CB2020 Ed. 1.7 § 4.6.1
% b+ O5 r% f( E+ KApproved at the 48th CTL
Plenary Meeting, in 2011
% \8 u% a. E- D( |' \! K' eQuestion:
Based on OD-CB2020-Ed.1.7 Sub-clause 4.6.1., it is not allowed to use statements such as “OK”, “meets
0 K3 J  ]5 U) R9 f7 F# M; Lthe 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.
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
, R, h/ L" L5 D3 ^be < [maximum required value - 30%]. The accuracy of the used instruments is in line with CTL
DSH 251B or better.
9 e' S5 g) R6 v- @0 q+ L+ _. kFor example measurement of insulation resistance:
· required
5 M;
· measurement range of test equipment 0 … 10 M;
9 p8 t5 `  I5 o" I, {· the measurement instrument shows full-scale deflexion.
The value given in the TRF should be > 6.5 M
.
For example measurement of creepage distance:
" \( u/ P" F) P- a5 R  W9 t- The required creepage distance is 3.0 mm.;
- The real distance is exceeding 4 mm.;
, c! y1 x% r( v. g7 WThe value given in the TRF should be > 4 mm.
) _/ _* ^" d; u3 x9 ZFor example measurement of leakage current:
- The current limit is 0.5 mA;
- The real current is below 0.35 mA;
/ c* O3 M8 E7 R: e( m3 |. f1 bThe value given in the TRF should be < 0.35 mA.
) Y+ O; k7 W/ |4 cThe following two situations are allowed:
  {3 o8 k- Z& a4 Z1 – 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
/ Z7 O" ?' L, u) a1 K, Trequirements. For example, creepage and clearance distances were greater than 0.8 mm.

# j5 r2 L: M7 ]

zyhua1985

Standard(s):
All IEC standards
) G/ R3 p# Y, {5 A. jSubclause(s):
General0 C2 ^7