TRFs – Values to be reported 9 S' k5 v2 u; J$ D" C5 N
General , [' {2 O" @ A8 r: m
All IEC standards: D$ m% p6 V6 ~4 s) B3 t
1 L* _+ s, ?$ l) n u" wStandard(s):) Y) g. ^% G" L3 ?
All IEC standards ; V4 U d) Q5 S/ \$ hSubclause(s): + }- t) W0 k" J6 _1 y( `General, d1 d9 w- Q) R& ?6 M, x
No. Year; q/ P* w2 Z& K6 R K) s$ y3 \
DSH & R; Q! k. t* h# Z1 s5 L7 x, I0791 20109 M: R0 Q( M* }5 V
Category: VARIOUS Developed by: WG4! b' A3 E) m* M
Subject:# L5 M+ n% @; p6 E; \1 t" ?
TRFs – Values to be reported' I8 t' }5 S3 P. N, g9 v3 U
Key words:- M/ G6 i9 p. a. k
- TRFs , M; e& I' y$ d) A8 d% K/ G V- Required minimum value4 P, [- N. l; p( y
- OD-CB2020 Ed. 1.7 § 4.6.1, H* t: F& Q7 x7 G5 A5 L1 A
Approved at the 48th CTL, v. n- u$ q3 g2 J g
Plenary Meeting, in 2011 ! }. L, I' ]4 V7 q. JQuestion:* |' a$ l ?* P. Y! C/ l# u: ~
Based on OD-CB2020-Ed.1.7 Sub-clause 4.6.1., it is not allowed to use statements such as “OK”, “meets& {: u& i4 I" W; U% W$ e6 S* G" }3 i
the standard”, “more than”, “less than”, or similar instead of the measured value, unless otherwise # r$ D( Z& h& h/ v8 b: Y C- uspecified by CTL. ; m5 ?* [6 G# }$ H" G5 G; n0 ZIn certain cases the required minimum value is exceeded by a great margin.3 |+ Z' J3 u0 _: q A8 l
Decision: - Z @- J( r% B5 V) \0 q6 ~In case that the measured minimum or maximum value is exceeding or is below the limit value for & l# R% \+ j1 m6 nmore than 30%, the value given in the TRF should be >[minimum required value + 30%] or should 1 \2 V) j% R! {8 T) }% t" s Hbe < [maximum required value - 30%]. The accuracy of the used instruments is in line with CTL1 ^9 b9 y$ E8 U$ ^! a$ `2 k; M l
DSH 251B or better. ( x. ? a, Q! B' X) ?4 WFor example measurement of insulation resistance:: K* e8 B6 f I
· required 5 M; 1 a! ?4 A, X# y4 q· measurement range of test equipment 0 … 10 M; 6 { [- ]% e9 ^& z% {0 u· the measurement instrument shows full-scale deflexion. 2 S# ?5 q5 y) L/ t/ w$ xThe value given in the TRF should be > 6.5 M. # t0 f& @6 B J7 v! y9 GFor example measurement of creepage distance: ! p* l+ y: k4 `- The required creepage distance is 3.0 mm.;8 ^% ?; F5 U0 @( H. h. V. c& D
- The real distance is exceeding 4 mm.; V3 i7 P7 p5 l+ c1 \
The value given in the TRF should be > 4 mm. . c7 l) w& w( Y) qFor example measurement of leakage current: 2 U9 A; m Z8 S3 M- The current limit is 0.5 mA; # j" b- m% s5 r+ n( Z- The real current is below 0.35 mA; 8 ?& C9 G8 m- B7 G" hThe value given in the TRF should be < 0.35 mA. 5 }/ O+ k Z; [) N- a/ Z: ]' P& wThe following two situations are allowed:3 V: h( E6 M2 Q/ g) T+ v+ C
1 – The meter reading is less than the smallest measurable graduation on a meter scale. For, v8 u h Z F" h2 B9 T
example, touch current measured was less that 0.1 mA., {& ~& G7 T, `! {6 k: T- w
2 – In checking creepage and clearance distances with a probe the same dimension as the" c- e) I6 e" T
requirements. For example, creepage and clearance distances were greater than 0.8 mm./ Z' y! Z! y7 x) h, A" L, Y8 S
DSH 791