DSH 406 The adequacy of the knob/shaft mechanical link

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DSH 406 . G* R# H* n4 I

The adequacy of the knob/shaft mechanical link

56.10 b) " G5 p( f6 H+ }/ n; K! `- q! [

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

* z, K9 g. H+ m+ ~Standard(s)- (year and edition):
IEC 60601-1:1988 Ed.2 Am1+Am2
: Y- O; I* ^3 w& b0 OSub clause(s): 56.10 b)
Sheet n°: DSH-406
8 m4 v! i5 q5 t  {Subject: The adequacy of the knob/shaft mechanical link
Key words:  Knob, torque
Confirmed 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
possibility of internal damage to the controlling device e.g. potentiometer.
! _5 w$ A; @" y4 ]2 v$ a3 Z& P  eb) The torque test values are too high. Maximum torque on a 10mm diameter knob was found
to be <0.5Nm.
Decision:
The torque test values in Table XIII are not excessive. This table could be re-examined in the
3rd edition of IEC 60601-1.
; G% |2 C* J. x4 h  s, s

& ]; O7 |2 ?2 S$ ^1 Z7 U- D+ C