DSH 406 The adequacy of the knob/shaft mechanical link

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DSH 406

The adequacy of the knob/shaft mechanical link : X  U7 H7 b+ k

56.10 b)

60601-1(ed.2);am1;am2 / D7 _/ D& A( }# y) J( w

; n' A' F; L2 `# N1 b& X4 E6 }& QStandard(s)- (year and edition):
/ g2 r" {0 V0 O' _" `  cIEC 60601-1:1988 Ed.2 Am1+Am2
! n8 Q  r6 J2 w2 M7 }6 ?Sub clause(s): 56.10 b)
( ]1 U( z/ N  a% |' @: DSheet n°: DSH-406
  H% s( i8 S2 s: C0 g7 x& NSubject: The adequacy of the knob/shaft mechanical link
Key words:  Knob, torque
- o" f, M5 E1 ~, x$ c+ e3 SConfirmed by CTL at its 39th meeting, in Cologne
Question:
a) The criteria is that the knob shall not rotate with respect to the shaft. This does not cover the
, S- x& }& q/ l" b& R0 Rpossibility of internal damage to the controlling device e.g. potentiometer.
b) The torque test values are too high. Maximum torque on a 10mm diameter knob was found
to be <0.5Nm.
& X# @/ y9 j5 l* L2 }* h0 @Decision:
" ]0 B- s7 E; I# C' q  wThe torque test values in Table XIII are not excessive. This table could be re-examined in the
! z7 c5 q* ~1 c' ~1 H3 \% R, @2 @3rd edition of IEC 60601-1.


( W1 ^/ A# |8 v# j  n