TRFs – Values to be reported 2 P% j) L5 r1 R% ?2 A0 j
General ; |2 N& q1 C W' }9 z
All IEC standards3 |- i% e6 O( N$ R h: n/ c1 p
: W3 e4 Z: m0 E6 {0 vStandard(s): 1 ^) q& I. I/ V& x' M/ w8 E7 v# H/ M9 |6 _All IEC standards 9 B3 G, v# [; Q oSubclause(s):' G/ \" Y1 j& o; X2 q$ r/ G) y
General & |2 b* h. c, y2 hNo. Year$ v7 c, s% g W/ O
DSH " n6 g! b2 k; B7 d5 A0791 2010 + @ j9 z/ y# e% f7 wCategory: VARIOUS Developed by: WG4- o- k O9 q2 R
Subject:( Y( d- \( Z( Y) Y. a* C+ D
TRFs – Values to be reported- v5 i F8 \- Z& V3 y5 L
Key words: 1 V8 h( Q6 T4 s9 m8 z- TRFs8 d- R5 q: Q9 t: F+ V8 T
- Required minimum value $ J/ w+ U5 }4 j0 {/ ]. R S( {- OD-CB2020 Ed. 1.7 § 4.6.1: h% P4 u4 l* u# ]" [
Approved at the 48th CTL , U. b! E5 n* {" S; ?6 s" t5 EPlenary Meeting, in 20119 c& Z; M+ V. B
Question: ( G7 r# A2 G2 M2 V/ gBased on OD-CB2020-Ed.1.7 Sub-clause 4.6.1., it is not allowed to use statements such as “OK”, “meets" |; N& ?$ R0 v3 z0 h/ v! N
the standard”, “more than”, “less than”, or similar instead of the measured value, unless otherwise I+ h' i$ q: J, Hspecified by CTL. % c& h! Y+ `) `" a5 t% Y0 k% zIn certain cases the required minimum value is exceeded by a great margin. , F9 U2 P+ y0 M E) y! M: NDecision: ! B) l7 N& x& D) `( i5 i) k& tIn case that the measured minimum or maximum value is exceeding or is below the limit value for ( e: H( o; A* u1 \) @; b1 x$ Z" Kmore than 30%, the value given in the TRF should be >[minimum required value + 30%] or should , L u0 Y0 W& a( [0 Ube < [maximum required value - 30%]. The accuracy of the used instruments is in line with CTL 8 s6 u5 P: l5 Y# ]DSH 251B or better. 4 z5 Q) o5 K" M8 Z( o2 z7 DFor example measurement of insulation resistance:4 m9 b! O- o9 G& T/ |6 K% U
· required 5 M; ) @# `* v$ X, P6 O· measurement range of test equipment 0 … 10 M; . |! w0 E: h1 M8 n· the measurement instrument shows full-scale deflexion. ) n; ], ?+ }, }& Q7 ZThe value given in the TRF should be > 6.5 M.; z% l+ F6 X2 ^9 X4 a
For example measurement of creepage distance:9 i# I# {. I! b1 G2 G w1 M5 O( c
- The required creepage distance is 3.0 mm.;, D% c5 X9 m4 e) f! Z# g) y
- The real distance is exceeding 4 mm.; 3 e# H* Y" W- N4 o5 j. g. [: qThe value given in the TRF should be > 4 mm., t4 e5 J+ V7 I% S
For example measurement of leakage current:" N* S0 o* d4 g6 [, r8 F
- The current limit is 0.5 mA; 1 m" H$ l9 M+ g- The real current is below 0.35 mA; 3 J$ R0 H/ o# s0 H( ^8 j* j0 g+ UThe value given in the TRF should be < 0.35 mA. 1 j8 A3 Y. C" z2 g- \, NThe following two situations are allowed: / t/ T4 X3 `) v5 \$ Q1 – The meter reading is less than the smallest measurable graduation on a meter scale. For6 a4 a% }8 D/ Q. C( x N, ?& Y
example, touch current measured was less that 0.1 mA.8 [! R' \4 A' H; r+ e
2 – In checking creepage and clearance distances with a probe the same dimension as the ]3 |: d# _+ I0 N1 G& J b
requirements. For example, creepage and clearance distances were greater than 0.8 mm. : q# I' n2 A/ j0 g3 r1 K+ d + d! m+ Z) C0 n+ ?( X6 t0 r[attach]77308[/attach]- T2 q) [; e7 c2 x 作者: zyhua1985 时间: 2013-4-25 23:13
Standard(s):: j7 u) ~, C* m: L7 e
All IEC standards: W$ ]) B) w5 J) b3 Q
Subclause(s):* u$ P4 _% I" E
General0 C2 ^7
DSH 791