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标题: DSH 420 Enclosure leakage current caused by external voltage [打印本页]
作者: 小米    时间: 2012-11-5 11:03
标题: DSH 420 Enclosure leakage current caused by external voltage
DSH 420' [& o0 H( r+ n) O" V4 g
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Enclosure leakage current caused by external voltage* a3 f6 i) L7 a) s" ~* R
19, 19.2 c)' L4 M& x' V) o$ X1 [* q0 N
60601-1(ed.2);am1;am2% Z0 s' p& t1 I9 V) g. _1 y
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Standard(s)- (year and edition):
; T- M+ p) U' v6 t4 A. UIEC 60601-1:1988 Ed.2 Am1+Am2
& G; Z0 o6 |2 c" A% ]7 r. PSub clause(s): 19, 19.2 c), w5 D+ B! `6 o$ P# \3 w
Sheet n°: DSH-420. e! ]; h4 K1 s+ i
Subject: Enclosure leakage current caused by external voltage# ?* H( r+ e. k9 [
Key words: Enclosure, leakage current, external voltage- n( C# W4 E4 v$ l
Confirmed by CTL at its 39th meeting, in Cologne8 t: x$ Y: l8 |; D( A+ G! T
Question:2 u6 s, j- K5 @5 z# P% N% k0 b
Since INTERNALLY POWERED EQUIPMENT has no reference to earth, the ENCLOSURE- [, E. W1 z2 z& `. o% T4 K
LEAKAGE CURRENT flowing between different parts of the ENCLOSURE will not be affected
  @8 O5 V- a# t' M1 |! Y+ y3 Pby an external voltage applied between earth and a SIGNAL INPUT or SIGNAL OUTPUT1 k+ w& P2 l5 O6 h& c4 ]
PART. Therefore the ENCLOSURE LEAKAGE CURRENT for INTERNALLY POWERED
4 |# J& g* `5 }- n' C2 TEQUIPMENT caused by such a voltage, should be measured as for CLASS II EQUIPMENT* i! H0 p2 D' v$ W+ M5 A
with MD1 between the ENCLOSURE and earth according to Figure 18. Further, the external3 Z. ]+ m: Z4 q7 s. f
voltage to be applied should be specified in Sub-clause 19.4 g) 3), in a similar way as in Subclause
* e( R, L$ @% f: o19.4 h) 8) and Figure 25 (Measurement of the PATIENT LEAKAGE CURRENT flowing
- L8 y: Z: s; ^" Efrom the APPLIED PART to earth, caused by an external voltage between earth and any0 g; }1 Y0 G8 G; S' b+ x; M
SIGNAL INPUT or SIGNAL OUTPUT PART), except that supply frequency does not apply for
! i4 b% A+ W! [6 X; S+ Y* A. \4 |EQUIPMENT with an internal battery.) s9 ?8 V9 S. C! [
Decision:
3 Y$ ?4 x' x* o. M5 Q8 R/ c! i* wTo clarify this issue, Sub-clause 19.4 g) 3) should read : .......”and INTERNALLY POWERED+ b7 o3 H  J8 ?
EQUIPMENT are tested for ENCLOSURE LEAKAGE CURRENT flowing between the+ Q6 Y1 P/ ~! |3 M  e, Z
ENCLOSURE and earth and also between different parts of the ENCLOSURE (measuring
; x7 X" U! `. Q+ a/ Bdevice applied as MD1 and MD2 in Figure 18).”1 F+ [  }& d+ t5 t1 ?# D
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