DSH 418 Load resistance in relation to load current

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DSH 418 + |6 j# i+ p4 m+ X7 d! s* c* Y $ I: v+ T3 y/ m( R" f

Load resistance in relation to load current : y% F3 ~2 o: l

57.9, 57.9.1

60601-1(ed.2);am1;am2 9 h) U, r9 _$ k4 f3 u! K+ K. M& e

! z5 \% l. h6 T* V% sStandard(s)- (year and edition):
IEC 60601-1:1988 Ed.2 Am1+Am2
! p9 {! r# M6 M# K5 wSub clause(s): 57.9, 57.9.1
# _; T1 H! ~$ ^9 l* D3 t! u, B* \Sheet 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:
  N2 O6 W2 F7 \. l3 @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
+ g9 l1 b, F' Z: Hwindings get heated during the test their resistance increases and one has to decrease the
' g% D8 i4 T+ [4 ]+ Nvalue of the load resistor to keep the current in the fused circuit in accordance with Table XX
& |& N2 E" c0 X" }6 qduring the test. Since the decrease of current is a result of the increase in the winding’s
" {- ~  v9 }, u; G$ e- n: Ntemperature, it seems to be an unrealistic fault condition to keep the current in the fused circuit
unchanged instead of keeping the load resistance unchanged.
) D, Y7 l/ f# g. n- ~( ~! T: h; [Decision:
The test load current must be maintained at its original value

+ ^" [3 _0 _) u; N# @; w0 C# h; J; B0 i4 I
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