DSH 418 Load resistance in relation to load current

小米

广东安规检测
有限公司提供：

小型摆管淋雨试验机

IPX5X6X7喷水试验机

1000L恒温恒湿箱

各种试验指现货

可程式恒温恒湿试验箱

水平垂直燃烧机

自动卷线器试验机

耐划痕试验机

各种灯头量规现货

灼热丝试验机现货

GB1002插头量规

IPX1-X7淋雨现货

IEC61347/UL935镇流器热试验箱

灯具防风罩

IK冲击试验机

UL498插头插座量规

VDE0620插头插座量规

稳定性试验台

家电温升测试角

针焰试验机现货

热电偶焊机现货

家电125mm试验指

E12灯头量规

无绳壶无绳电熨斗插拔寿命试验机

IEC60335试验指甲

DSH 418

Load resistance in relation to load current / U& ^% m: A! o* j4 \% E1 X; N

57.9, 57.9.1 ' J7 ]0 A: x, S/ ?# w1 N/ T# n: p

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

Standard(s)- (year and edition):
IEC 60601-1:1988 Ed.2 Am1+Am2
Sub clause(s): 57.9, 57.9.1
) Z- J' G; S: ~$ d% U7 QSheet n°: DSH-418
, T0 t; R! w1 _$ k. c+ |Subject: Load resistance in relation to load current
Key words: Load resistance, load current
8 p% x- s7 G/ j: o! J# DConfirmed by CTL at its 39th meeti ng, in Cologne
0 f9 L8 V# ]/ Z6 B3 W3 }Question:
! A; X1 |  P" a' }% L& i- B( DPractically 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
windings get heated during the test their resistance increases and one has to decrease the
5 m; C4 ?8 f9 a* c) evalue 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
9 w) K7 X  m( m* r: O) ounchanged instead of keeping the load resistance unchanged.
/ S' {6 j/ q9 d6 ~  y$ dDecision:
The test load current must be maintained at its original value
* b2 M( M& M2 ]' h1 I3 ^1 p+ ~8 q
" D+ t7 k' O9 Q, ?4 J; J