DSH 791 TRFs – Values to be reported

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DSH 791

TRFs – Values to be reported 2 h7 o- H& J9 w" p+ s4 z

General ; j$ u& ^' H4 j8 v

All IEC standards

Standard(s):
' @4 ]# q8 n* l2 ^: gAll IEC standards
Subclause(s):
- k* c& j. d% d, g$ @General
' W3 @9 Z0 d$ g1 }* |- pNo. Year
) l  V' }' ]* [1 q$ R: D) b# S2 rDSH
7 j, {. r: B/ Z) c0791 2010
  z- F; F& F5 ~+ L6 V# jCategory: VARIOUS Developed by: WG4
Subject:
TRFs – Values to be reported
' X" G" G* X) M# PKey words:
- TRFs
- Required minimum value
- OD-CB2020 Ed. 1.7 § 4.6.1
Approved at the 48th CTL
& ]" ^% I' ?2 n( M7 D! ^* J: \) \Plenary Meeting, in 2011
0 K* a: t! n: v9 L  IQuestion:
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.
* p3 S# z% q9 O& f" I. @2 PIn certain cases the required minimum value is exceeded by a great margin.
Decision:
: u0 Z7 m& W! Z9 p: jIn 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
* W3 |/ ]5 g3 I; L* ybe < [maximum required value - 30%]. The accuracy of the used instruments is in line with CTL
DSH 251B or better.
For example measurement of insulation resistance:
6 o0 }. i/ {7 s+ ?" ?· required
5 M;
9 b! T$ B: f+ p· measurement range of test equipment 0 … 10 M;
· the measurement instrument shows full-scale deflexion.
The value given in the TRF should be > 6.5 M
.
9 V/ y2 M) j4 q; CFor example measurement of creepage distance:
* g& ~. i6 Z; C$ e# a' H- The required creepage distance is 3.0 mm.;
- 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;
+ l# N3 j/ F1 G/ a( q, g- The real current is below 0.35 mA;
, m' v; G+ _5 L) i6 A; x0 |/ b$ V4 CThe value given in the TRF should be < 0.35 mA.
7 \$ t1 Y: E! S7 ~, A/ S( kThe following two situations are allowed:
6 F2 `1 j0 M1 W, g1 – The meter reading is less than the smallest measurable graduation on a meter scale. For
: u0 z4 y1 P( Cexample, touch current measured was less that 0.1 mA.
6 S  y7 r$ k8 K% B. s! d- ]2 – In checking creepage and clearance distances with a probe the same dimension as the
4 A; x$ {$ T+ Wrequirements. For example, creepage and clearance distances were greater than 0.8 mm.
. K: S; d& y2 a, J% p# p! r3 U1 y
6 `! F$ k2 T/ \! C0 `+ u
  W5 H8 x' _% ^( w" }" X% m

zyhua1985

Standard(s):
) {: @8 u2 k3 x/ b; W2 UAll IEC standards
; j( Q2 L% W+ [0 `# [: K" M* N# hSubclause(s):
General0 C2 ^7