TRFs – Values to be reported % M) ?( b8 F/ s ]' h. K' [8 \( b
General/ U" t8 G9 L9 V! V
All IEC standards# y, d) g+ L. @' F3 n; n% v: l
. p/ Y" b6 [$ n! pStandard(s):$ D+ m( G# m2 h" R; X# C- v2 }
All IEC standards ( u8 J5 K6 h8 b, l5 n8 ^Subclause(s): ; m0 h8 x3 [8 _& B9 ?General ) L% q. u- D: e- KNo. Year4 y! z# P* J; j" m6 R6 A
DSH V7 Y, S u+ L, e. k- g
0791 2010 . ^& D- k9 i- s1 K: S$ Y$ L/ r$ sCategory: VARIOUS Developed by: WG4 0 k' @; X) o* i$ x/ aSubject: 5 E8 h1 W$ M+ _TRFs – Values to be reported + Z% i+ O+ R- B9 b+ \2 hKey words: % I+ P$ H* s8 Y9 x5 H4 [; |4 G- TRFs, J# F' b$ |$ S* Q( J# ?5 C
- Required minimum value 9 Q1 c% u @1 ^- OD-CB2020 Ed. 1.7 § 4.6.1. [! ~# U w. J$ N" @; j# r
Approved at the 48th CTL5 ^- F! W! ?$ i1 @4 m% B6 v4 m
Plenary Meeting, in 2011 ' z- Y {# W! F, MQuestion: 8 K# }0 x% r. D# i/ f( H9 K$ }Based on OD-CB2020-Ed.1.7 Sub-clause 4.6.1., it is not allowed to use statements such as “OK”, “meets$ b& _2 w3 U& I' G
the standard”, “more than”, “less than”, or similar instead of the measured value, unless otherwise6 A2 z" `) x @1 r
specified by CTL.) P* j' k5 S0 x8 s% K- u! z& S6 P1 r
In certain cases the required minimum value is exceeded by a great margin.1 g+ D, R6 @9 f# D
Decision:( y v+ a o) f% W
In case that the measured minimum or maximum value is exceeding or is below the limit value for/ M \: l' X% |$ g9 _
more than 30%, the value given in the TRF should be >[minimum required value + 30%] or should; l# ~5 y6 k+ G8 v& x& r! b8 `! Q
be < [maximum required value - 30%]. The accuracy of the used instruments is in line with CTL# f! J! M, v5 @' d7 l
DSH 251B or better. " o" k% H: w. u! q7 T dFor example measurement of insulation resistance: # g/ D0 M, w( G- T6 c4 _· required 5 M; 7 A5 p) ]) u3 ^+ y: Q! }, y1 I· measurement range of test equipment 0 … 10 M; 6 f' l; ~+ U1 ~· the measurement instrument shows full-scale deflexion. + d+ _8 R% a* K: W+ SThe value given in the TRF should be > 6.5 M. $ D# R& {# b7 L; q, e* MFor example measurement of creepage distance: * {1 X( Y$ D9 v3 v- The required creepage distance is 3.0 mm.; 3 w e D9 a. g- The real distance is exceeding 4 mm.; 0 X$ d/ G% }( g2 {; Y, MThe value given in the TRF should be > 4 mm. ( X8 u6 @* i& r! A$ F' JFor example measurement of leakage current:, y/ \0 Q) ~* r% p% ~+ A7 Z
- The current limit is 0.5 mA; % E. e( _& j0 R+ s. s- The real current is below 0.35 mA; * Z6 R/ b* z' b. A+ l, }* |The value given in the TRF should be < 0.35 mA.6 D' ?: Q% Q8 a9 ]+ Z/ D0 D; Q
The following two situations are allowed:" U% C9 d5 N( @1 d8 l. H9 q
1 – The meter reading is less than the smallest measurable graduation on a meter scale. For/ Z9 n L9 B' P6 h; q8 E
example, touch current measured was less that 0.1 mA. 1 v# H! N# v* _5 [2 – In checking creepage and clearance distances with a probe the same dimension as the' Q4 B" |5 N8 J5 z% V5 j* V
requirements. For example, creepage and clearance distances were greater than 0.8 mm. 7 A/ @% F, q0 W5 x8 \4 N& i $ R+ t b7 ~1 ?% ?1 z/ I7 \[attach]77308[/attach] $ t; p6 p/ s& l5 j& R9 k4 j作者: zyhua1985 时间: 2013-4-25 23:13
Standard(s): 9 g* | n5 I: `$ k1 YAll IEC standards 6 s2 ~$ r1 j9 Z, @# w- H) u# KSubclause(s): / K6 `" N9 j ~6 y7 sGeneral0 C2 ^7
DSH 791