DSH 791 TRFs – Values to be reported

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DSH 791 * J/ P0 G: ^* F1 H  t- i9 j/ a+ l

TRFs – Values to be reported

General # m. O( }; g- g0 K  j

All IEC standards

Standard(s):
0 s: I/ t7 _: C) TAll IEC standards
Subclause(s):
# J; H$ Y, n2 n+ pGeneral
* p: t) T$ W1 k  s) [- }! ]- xNo. Year
7 X3 p& g5 _4 n6 L( BDSH
& S! E1 h1 j4 q4 s! M- Z8 T) e0791 2010
Category: VARIOUS Developed by: WG4
Subject:
TRFs – Values to be reported
Key words:
. U8 a* f  S, t- TRFs
4 B9 X3 C' {+ Y2 Z$ y5 O9 Y% n" |5 f- Required minimum value
$ f' W: f" h' m3 K6 ^9 E" o4 ?- OD-CB2020 Ed. 1.7 § 4.6.1
9 [; A( z, V8 `) J, VApproved at the 48th CTL
Plenary Meeting, in 2011
! D5 M* E+ o% c: B# C& w) O1 |Question:
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
7 v/ i5 P7 X7 L/ F; G7 B. t* gspecified by CTL.
9 g4 M0 j) ?! iIn certain cases the required minimum value is exceeded by a great margin.
/ G: d# r/ u; O+ }: I9 bDecision:
6 }, H0 R2 N( s, n' ^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
9 W; C, t+ a( r) Rbe < [maximum required value - 30%]. The accuracy of the used instruments is in line with CTL
& _4 e6 q: a- N0 A9 pDSH 251B or better.
7 w; @" ~; Y2 V4 ^& h% nFor example measurement of insulation resistance:
· required
5 M;
· measurement range of test equipment 0 … 10 M;
/ P- C7 k% A! |) f% s7 x  W0 f, k* P" u· the measurement instrument shows full-scale deflexion.
The value given in the TRF should be > 6.5 M
.
For example measurement of creepage distance:
! P5 ~1 I: M' @2 q- The required creepage distance is 3.0 mm.;
- The real distance is exceeding 4 mm.;
7 ]6 l6 `5 Y/ j! `5 C9 c8 UThe value given in the TRF should be > 4 mm.
For example measurement of leakage current:
- The current limit is 0.5 mA;
8 x: X! ]  j) J# Z2 l- The real current is below 0.35 mA;
The value given in the TRF should be < 0.35 mA.
The following two situations are allowed:
" k6 b, t# C) H$ L+ P7 \0 u1 – 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.
( l$ f( |) Z, y. P: e6 W' O2 – 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.

) M! @; ~& @0 ~/ M

zyhua1985

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