DSH 406 The adequacy of the knob/shaft mechanical link

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DSH 406 , Z3 a% P+ H, Q8 B, e

The adequacy of the knob/shaft mechanical link

56.10 b) ! J2 _5 v: V' J% M8 B

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

Standard(s)- (year and edition):
IEC 60601-1:1988 Ed.2 Am1+Am2
Sub clause(s): 56.10 b)
1 j/ u$ \) e% P% \7 mSheet n°: DSH-406
- z( L! ~, ^+ f# P- @: [2 hSubject: The adequacy of the knob/shaft mechanical link
' S! k, c$ Y* Q. Y2 L+ w7 g! SKey words:  Knob, torque
1 F8 O4 H/ t& ?5 p: `2 i% TConfirmed by CTL at its 39th meeting, in Cologne
' @$ i3 H, E  E7 h2 _: h. `Question:
# o$ V* E( m+ q7 U: y( X. K# }8 Va) The criteria is that the knob shall not rotate with respect to the shaft. This does not cover the
3 P; c5 f1 X; n9 X" ?possibility of internal damage to the controlling device e.g. potentiometer.
. q+ w9 r& {! a' I9 Kb) The torque test values are too high. Maximum torque on a 10mm diameter knob was found
' p; `- T( l! x3 H4 {' h8 b3 gto be <0.5Nm.
% K2 a! S& E  ?) KDecision:
The torque test values in Table XIII are not excessive. This table could be re-examined in the
3rd edition of IEC 60601-1.
! ]- e+ i0 W7 d3 A
9 |8 Z0 f' i: z3 j6 x+ Y* _: l0 V% r