DSH 406 The adequacy of the knob/shaft mechanical link

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DSH 406

The adequacy of the knob/shaft mechanical link

56.10 b) 6 G& f, |, N! N: U; }" n2 d3 @

60601-1(ed.2);am1;am2 3 L. R- R! Y" t1 \+ v6 q+ w

$ V4 l# v8 C; HStandard(s)- (year and edition):
IEC 60601-1:1988 Ed.2 Am1+Am2
Sub clause(s): 56.10 b)
0 h9 O% d8 ]7 g* \% l2 D' PSheet 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:
6 I1 H% b& l0 ra) The criteria is that the knob shall not rotate with respect to the shaft. This does not cover the
% i0 J1 i& T" z7 N$ G) p% K& ?3 D. u% Xpossibility 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
) O( y) c8 S4 Z! h1 t$ T7 u& {to be <0.5Nm.
/ L9 O* w. e2 y6 i0 Y4 O) yDecision:
The torque test values in Table XIII are not excessive. This table could be re-examined in the
/ p! `& h2 M- r- b4 o2 b! d3rd edition of IEC 60601-1.

! y$ e, H$ l+ r* G) R; H; k( H