DSH 406 The adequacy of the knob/shaft mechanical link

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DSH 406 9 i7 [' o7 o3 f" Q8 k/ a+ T 1 ]; |4 c4 |2 ^2 c, l

The adequacy of the knob/shaft mechanical link : s* \: Y" @* c$ C

56.10 b) # l. C' b0 ^; g5 e8 B

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

Standard(s)- (year and edition):
! x" l4 p7 G+ t6 Z3 ]# KIEC 60601-1:1988 Ed.2 Am1+Am2
# r& Y; P" ]/ H% _# S$ V6 B* G5 L1 P# ESub clause(s): 56.10 b)
  D4 u% Y% X8 K6 ?, t  s6 B; m  z# H7 VSheet n°: DSH-406
Subject: The adequacy of the knob/shaft mechanical link
6 s: W  D. s! v' e: g8 I4 VKey words:  Knob, torque
Confirmed by CTL at its 39th meeting, in Cologne
Question:
) \4 o/ e; ?& ~% T5 X; L3 fa) The criteria is that the knob shall not rotate with respect to the shaft. This does not cover the
" _' C2 i7 K8 jpossibility of internal damage to the controlling device e.g. potentiometer.
! o! M2 {+ H0 p/ x( {, ?# U/ Ob) The torque test values are too high. Maximum torque on a 10mm diameter knob was found
0 Z" K1 Z% z7 S$ ato be <0.5Nm.
Decision:
The torque test values in Table XIII are not excessive. This table could be re-examined in the
2 X, q, c% }# p0 [3rd edition of IEC 60601-1.

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