DSH 791 TRFs – Values to be reported

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DSH 791 / u! F0 [  ?  ]* A5 ^ & U9 {9 V! R% m  x, H: v

TRFs – Values to be reported

General

All IEC standards

& M' V$ Q# G6 ^7 E* {% FStandard(s):
All IEC standards
Subclause(s):
General
No. Year
DSH
4 }4 V6 D; P! P3 v2 W0791 2010
& _0 v' }/ h% o0 U+ C, zCategory: VARIOUS Developed by: WG4
2 Z0 y5 d, ^4 X$ ?0 o; X* `Subject:
  @4 u3 A, _8 H9 w2 V/ DTRFs – Values to be reported
Key words:
- TRFs
- Required minimum value
- OD-CB2020 Ed. 1.7 § 4.6.1
  T2 J% ^  k. o! L- n8 T/ Y2 DApproved at the 48th CTL
& T' T$ w+ A6 F, V2 Z  g( g+ }Plenary Meeting, in 2011
8 b3 M" X' ^) s) D5 ~+ bQuestion:
Based 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.
' A+ k7 c( k! Y; a5 @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
: l, b+ b& U& x0 _  Vmore than 30%, the value given in the TRF should be >[minimum required value + 30%] or should
0 P+ o7 u; [1 T2 Ebe < [maximum required value - 30%]. The accuracy of the used instruments is in line with CTL
/ t% u1 {4 R$ A6 e( ODSH 251B or better.
For example measurement of insulation resistance:
· required
5 M;
· measurement range of test equipment 0 … 10 M;
+ l# x# o1 z5 B- ^/ D, h% Y9 t# q· the measurement instrument shows full-scale deflexion.
1 y9 G) c  A/ v% I" \5 gThe value given in the TRF should be > 6.5 M
.
) I' c5 B- q+ @2 ?! P4 |  CFor example measurement of creepage distance:
+ V) h$ }+ I0 |4 e$ U" b" H% l! G6 K( F- The required creepage distance is 3.0 mm.;
- The real distance is exceeding 4 mm.;
) g7 X$ j- J$ m' pThe value given in the TRF should be > 4 mm.
# m2 N' C" z8 ], J$ KFor example measurement of leakage current:
- The current limit is 0.5 mA;
. Q! Y: H( C0 b# O3 ?, u- The real current is below 0.35 mA;
The value given in the TRF should be < 0.35 mA.
3 V# w9 J( M/ n' n0 u( d" _9 J- sThe following two situations are allowed:
9 g# B1 }2 v# B- ^' l0 R; L1 – The meter reading is less than the smallest measurable graduation on a meter scale. For
6 v  S, ~- k. ~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.

$ s1 r2 Z  W  P+ V& S' z$ h: x
+ J, ~* M; F* N) u

zyhua1985

Standard(s):
All IEC standards
Subclause(s):
General0 C2 ^7