DSH 418 Load resistance in relation to load current

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DSH 418 4 K% r9 ]! B. r# H$ c6 V

Load resistance in relation to load current ! n- M. x4 @' `

57.9, 57.9.1

60601-1(ed.2);am1;am2

" T. Z- X: q  F. s8 f. KStandard(s)- (year and edition):
IEC 60601-1:1988 Ed.2 Am1+Am2
1 `5 L6 R5 R% {Sub clause(s): 57.9, 57.9.1
+ S) R  s, G& l9 T; uSheet n°: DSH-418
Subject: Load resistance in relation to load current
Key words: Load resistance, load current
Confirmed by CTL at its 39th meeti ng, in Cologne
Question:
Practically the test is performed with the winding under overload connected to a resistor with
the resistance value that yields the correct test current in accordance with Table XX. As the
" R' A* W5 s; ^$ a2 ~/ Twindings get heated during the test their resistance increases and one has to decrease the
$ N6 F& \) U  J' _; }1 m7 \6 K* Dvalue of the load resistor to keep the current in the fused circuit in accordance with Table XX
during the test. Since the decrease of current is a result of the increase in the winding’s
temperature, it seems to be an unrealistic fault condition to keep the current in the fused circuit
( S$ N$ U" ?5 _; Z) S2 dunchanged instead of keeping the load resistance unchanged.
Decision:
1 W+ ?. e. t; X4 J5 N2 KThe test load current must be maintained at its original value


! A8 T3 d+ I3 P* f, ~) {