DSH 791 TRFs – Values to be reported

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DSH 791 , C& X9 p# p2 z) C" i

TRFs – Values to be reported 3 `$ K- E" G2 Q  o- b2 V( ]

General 1 N# A0 i, \; Y* B6 F  t! R

All IEC standards $ Z3 ?( d8 l9 n. c* x2 V

Standard(s):
: a! L. t4 O8 _& z) dAll IEC standards
" o1 B+ |* \8 D1 ISubclause(s):
General
& w5 `! `/ x4 B! kNo. Year
. e; A7 v! N1 yDSH
0791 2010
Category: VARIOUS Developed by: WG4
Subject:
; X3 v; ^1 c$ g7 v1 ~4 QTRFs – Values to be reported
" N2 J, n; G0 A6 L4 X* sKey words:
- TRFs
$ {. C) h8 F8 _% {- Required minimum value
- OD-CB2020 Ed. 1.7 § 4.6.1
+ J* m5 }+ W( v. f& {Approved at the 48th CTL
Plenary Meeting, in 2011
Question:
6 r2 |8 _2 a0 ~Based on OD-CB2020-Ed.1.7 Sub-clause 4.6.1., it is not allowed to use statements such as “OK”, “meets
0 [( k2 N6 z, g( v1 Uthe standard”, “more than”, “less than”, or similar instead of the measured value, unless otherwise
2 Z8 w' d4 z# I- Kspecified 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
be < [maximum required value - 30%]. The accuracy of the used instruments is in line with CTL
9 R3 Z* s% Q) \; q) eDSH 251B or better.
For example measurement of insulation resistance:
( A" {" N& D. J  g4 p· required
5 M;
· measurement range of test equipment 0 … 10 M;
; k1 N/ m% e$ ^3 `/ o1 g" J· the measurement instrument shows full-scale deflexion.
8 @$ M5 D; c7 U. L3 eThe value given in the TRF should be > 6.5 M
.
8 P' f2 C5 }! I  \# t7 @For example measurement of creepage distance:
/ M! g, t9 F/ |1 z  [- The required creepage distance is 3.0 mm.;
- The real distance is exceeding 4 mm.;
. s2 C% g. T0 E1 F6 LThe value given in the TRF should be > 4 mm.
- I+ L/ ?9 @, K1 q3 ^; e, |8 d" ^For example measurement of leakage current:
- The current limit is 0.5 mA;
9 j9 }# B9 p2 A& J) }* j. U- The real current is below 0.35 mA;
; N/ m8 g" ?- }2 u8 W3 RThe value given in the TRF should be < 0.35 mA.
: C" f# B# Y8 s  MThe 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
1 ^$ ^/ F4 s0 t7 U0 D: z7 Brequirements. For example, creepage and clearance distances were greater than 0.8 mm.

1 R9 h& F& [" }

zyhua1985

Standard(s):
All IEC standards
) |0 b3 k& ~% O* hSubclause(s):
; o6 P5 [/ S) c0 {7 v# nGeneral0 C2 ^7