DSH 406 The adequacy of the knob/shaft mechanical link

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DSH 406 # ^6 ]/ B) ^6 P, C0 L7 c, c5 o

The adequacy of the knob/shaft mechanical link 8 M9 M' t3 _" [+ n/ u/ P" m

56.10 b) 1 S- Q; Q; I- ?: w

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

. @6 |# x  ~- F$ ]! V" _Standard(s)- (year and edition):
+ \  t+ d. {  X0 ?IEC 60601-1:1988 Ed.2 Am1+Am2
Sub clause(s): 56.10 b)
. _, ], E: j6 D6 }9 rSheet n°: DSH-406
Subject: The adequacy of the knob/shaft mechanical link
$ i; {- a# `( v$ c. [7 J+ pKey words:  Knob, torque
Confirmed by CTL at its 39th meeting, in Cologne
! H+ B% r: ?3 t! v& d  GQuestion:
a) The criteria is that the knob shall not rotate with respect to the shaft. This does not cover the
3 l+ S/ N, z. o5 l/ N6 }4 {possibility of internal damage to the controlling device e.g. potentiometer.
1 M4 K" d3 d* ]4 wb) The torque test values are too high. Maximum torque on a 10mm diameter knob was found
to be <0.5Nm.
Decision:
1 J1 Z  S4 W9 J7 m. dThe torque test values in Table XIII are not excessive. This table could be re-examined in the
3rd edition of IEC 60601-1.

% u" u, ?, L5 \5 K5 r. d( L