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| DSH 791
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| TRFs – Values to be reported
. ]1 U* Y3 r& U9 l | General: v" s' v+ g0 t5 H% M) H! `: u
| All IEC standards1 t4 c/ A6 G0 i
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Standard(s):" d: a6 l& B1 u# L# W7 k* S! D$ V; _
All IEC standards
4 a) w# C. @, n: hSubclause(s):
8 A( v3 ] w4 c9 f2 G8 ZGeneral- i: l$ V$ l2 t$ G. _3 \
No. Year: g c0 Q& m: }2 f" y8 H, m
DSH) V# i2 K- R- g( T+ {/ C# @
0791 2010# ]: m0 O' M/ G, k
Category: VARIOUS Developed by: WG4) ~! R/ ?5 g; L' ^4 d* X$ Z
Subject:
, n2 k1 ~) M# p' w" oTRFs – Values to be reported7 E+ W3 o- y( Z/ E
Key words:) C+ H& r* y- [/ t0 U
- TRFs) G9 a& f) q+ W N- i
- Required minimum value
: S; u( @1 f# W" l6 C K! {' n- OD-CB2020 Ed. 1.7 § 4.6.15 e! {5 j# p5 A" G
Approved at the 48th CTL
5 M( B- K7 ~* |* {' Y+ CPlenary Meeting, in 2011
% ?/ E$ E# X5 u( z2 j1 `Question:, c. E* r, |; A, }3 D2 z3 t: q
Based on OD-CB2020-Ed.1.7 Sub-clause 4.6.1., it is not allowed to use statements such as “OK”, “meets! Z7 c# E" _* @+ {4 I) Z
the standard”, “more than”, “less than”, or similar instead of the measured value, unless otherwise( S1 q3 q; v3 J7 w1 g
specified by CTL.
+ w6 M% ]0 |% s$ I- o4 ?In certain cases the required minimum value is exceeded by a great margin.
# d3 Q6 g; s9 J% i. o) L( ODecision:
: m5 {0 k2 n4 {, K: s4 zIn case that the measured minimum or maximum value is exceeding or is below the limit value for
' p7 ]5 R. L& V) Omore than 30%, the value given in the TRF should be >[minimum required value + 30%] or should
" z* _9 S/ [' u) N8 t$ rbe < [maximum required value - 30%]. The accuracy of the used instruments is in line with CTL
5 B) I% {1 z4 k: C+ J, o. g; t2 PDSH 251B or better." ~. z8 G3 K5 f3 y
For example measurement of insulation resistance:
0 H9 l: S3 G4 X8 m# K( e% g· required 5 M;/ ^ w7 e; z( r: H5 Y5 }8 k0 V6 R( D
· measurement range of test equipment 0 … 10 M;. X' K8 L( S: S6 n q( @
· the measurement instrument shows full-scale deflexion.% z$ D0 K, f* r8 q( Z2 W
The value given in the TRF should be > 6.5 M. |' \3 B$ |1 d; [" H6 B
For example measurement of creepage distance:$ G: i) G2 F2 X% U& ?# E( D
- The required creepage distance is 3.0 mm.;6 Z) h0 C+ l# g- B0 S
- The real distance is exceeding 4 mm.;
# C; L& f, `6 l. I7 Q4 c( BThe value given in the TRF should be > 4 mm.8 A* {2 y2 l% L9 d- ~3 I2 p/ G4 V/ S" T
For example measurement of leakage current:" q% }9 Q6 x0 U9 ^
- The current limit is 0.5 mA;! V6 _. d0 [/ t/ M- q. y
- The real current is below 0.35 mA;- W; C( c+ o1 l+ Y0 W% k( u
The value given in the TRF should be < 0.35 mA.
- V8 O7 D K& u2 qThe following two situations are allowed:
/ _/ P2 O8 j1 x. K# V! R" U! O7 v: Z1 – The meter reading is less than the smallest measurable graduation on a meter scale. For I$ a' [, D8 C; e! `
example, touch current measured was less that 0.1 mA.: Y6 L- g! L I2 v/ `- k A; Z
2 – In checking creepage and clearance distances with a probe the same dimension as the
+ `" u, K. G; K+ S. S7 J) @6 U$ v" Srequirements. For example, creepage and clearance distances were greater than 0.8 mm.
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