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|  DSH 474/ R, ? P- t' M0 H% s+ Y4 O
* K o$ V# x$ Q; Y% M | General conditions for the tests9 x, H' }/ K3 s/ m# W
| 4.12
8 k, k6 Z$ M# E; E5 u( E | 60335-1(ed.3)7 _* `* v7 Q% p. j! O& u# p
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Standard: IEC 60335-1:1991, 3rd Ed.- Z+ |) Q2 ~) C( f- d$ m y K
Sub clause: 4.12: M8 G6 n* X: m/ f* @: L9 D) B+ {
Sheet No. DSH-474
6 k; V0 F7 x' _! j/ fSubject: General conditions for the tests/ S; N [3 b" U2 c6 [1 q5 m' X' Q
Key words: - supply voltage1 _. P2 E9 y( Q3 P
Decision taken at the 40th CTL meeting 20030 [4 w" V5 H1 j" M. w, ] G; _
Question:
% W* e0 k5 _/ M$ ]* xIn the case of heating elements without appreciable positive temperature coefficient of
% ]7 D0 K+ C0 F( y& e$ K: O; W6 Aresistance, should the supply voltage be adjusted during performance of the test? C; u% e4 B& g0 h c/ d5 F
Rationale:
4 r7 b5 b& p. wSee question.4 @ {2 s7 N, h8 q: X
Decision:
+ a9 e$ p# W) p" M; BThe voltage shall be continuously adjusted to obtain the intended input.4 d6 W6 i l1 V
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发表于 2012-9-12 12:46
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