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[MED] DSH 420 Enclosure leakage current caused by external voltage

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发表于 2012-11-5 11:03 | 显示全部楼层 |阅读模式
广东安规检测
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DSH 420* l; m1 ]' q( p- W* ~

" r/ Q/ U  T: w
Enclosure leakage current caused by external voltage
) N2 m) s' d4 g" l! b8 E  m
19, 19.2 c)( X6 V/ m! ?2 {
60601-1(ed.2);am1;am2
$ Z( Z' p: i  w+ n
  {- o5 ]- F, h, ~2 W4 T* m
Standard(s)- (year and edition):/ H% g8 Q& }: v9 C- [+ g9 d5 a
IEC 60601-1:1988 Ed.2 Am1+Am29 N2 g8 Q# `9 u
Sub clause(s): 19, 19.2 c)1 C* ?( j$ C( D
Sheet n°: DSH-420
! ~; s& h) G+ R5 K& XSubject: Enclosure leakage current caused by external voltage, C1 s: n$ s+ F6 s4 J* G
Key words: Enclosure, leakage current, external voltage4 t6 |  a' w; }6 }
Confirmed by CTL at its 39th meeting, in Cologne
8 Y6 i0 e3 u5 W: \% p0 O0 yQuestion:$ [' Z3 K! d1 d0 I; D- w
Since INTERNALLY POWERED EQUIPMENT has no reference to earth, the ENCLOSURE
4 B: A, R+ j8 P9 RLEAKAGE CURRENT flowing between different parts of the ENCLOSURE will not be affected1 i2 p/ u) N# h5 l" |# f1 R$ p
by an external voltage applied between earth and a SIGNAL INPUT or SIGNAL OUTPUT) z- D! d/ r0 A. j  \9 ~( H
PART. Therefore the ENCLOSURE LEAKAGE CURRENT for INTERNALLY POWERED4 ~7 Z7 W/ R5 V1 h# _' D
EQUIPMENT caused by such a voltage, should be measured as for CLASS II EQUIPMENT: A0 b" a, @1 t* R5 @% q/ H: T
with MD1 between the ENCLOSURE and earth according to Figure 18. Further, the external
" `$ j2 u' ^1 ]; l6 B" svoltage to be applied should be specified in Sub-clause 19.4 g) 3), in a similar way as in Subclause8 R3 Z* S8 O3 ~% N0 |
19.4 h) 8) and Figure 25 (Measurement of the PATIENT LEAKAGE CURRENT flowing
- ]( b( Q, R5 u9 }2 R% Jfrom the APPLIED PART to earth, caused by an external voltage between earth and any
$ Q+ l% K2 D- tSIGNAL INPUT or SIGNAL OUTPUT PART), except that supply frequency does not apply for
) Y: d2 L( D# L, T! e" m7 N0 U  mEQUIPMENT with an internal battery.9 \' [5 I1 b+ `9 u0 {
Decision:% Z5 X  G/ D1 c2 {! Q) @) Q) m9 C$ H
To clarify this issue, Sub-clause 19.4 g) 3) should read : .......”and INTERNALLY POWERED8 ]( {% D; {3 ~  K8 C
EQUIPMENT are tested for ENCLOSURE LEAKAGE CURRENT flowing between the3 \( ]0 H; R* K6 I0 |! n0 X
ENCLOSURE and earth and also between different parts of the ENCLOSURE (measuring
6 P' O  J0 W) K: `  T. S( \. M/ ydevice applied as MD1 and MD2 in Figure 18).”
; W6 z! q$ W: }4 j  F. o8 I* {; D0 j* t5 |+ Z

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