DSH 406 The adequacy of the knob/shaft mechanical link
http://decisions.iecee.org/icons/ecblank.gif DSH 406
The adequacy of the knob/shaft mechanical link
56.10 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)
Sheet n°: DSH-406
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.
b) 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.
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