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|  DSH 406
2 Q/ q7 S( `' R& O. E$ [$ }0 j5 P" p5 o7 k# g+ l
| The adequacy of the knob/shaft mechanical link
9 C# d# S8 H3 Q0 W. Y& N | 56.10 b)
8 ?4 N2 ]7 K$ O3 S: A0 G | 60601-1(ed.2);am1;am2/ p8 ~) N& N: p6 I# f' J0 ?/ V
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8 W" J% G: S. u7 q, H5 x) ]
Standard(s)- (year and edition):8 H4 o; s3 V! d8 {. U
IEC 60601-1:1988 Ed.2 Am1+Am2; I. ]$ z8 j3 P" y7 c9 {
Sub clause(s): 56.10 b)
$ r- S( ^' r0 D7 r h; p: L3 d% |0 ~Sheet n°: DSH-4062 ~( R) N/ ^& n# z8 e
Subject: The adequacy of the knob/shaft mechanical link6 ?! O, Z8 s% _0 }4 E9 P
Key words: Knob, torque
. L4 ^) `$ ^7 z) ^( F6 sConfirmed by CTL at its 39th meeting, in Cologne
9 J$ u8 n+ @/ z/ J d" K" Q' aQuestion:
/ P% s3 t' E2 ta) The criteria is that the knob shall not rotate with respect to the shaft. This does not cover the) X' b" f6 V! v$ N6 F6 i
possibility of internal damage to the controlling device e.g. potentiometer.
5 Y: J/ u4 T9 n+ p% t4 |b) The torque test values are too high. Maximum torque on a 10mm diameter knob was found8 y. ?5 C3 a; L _! I. M
to be <0.5Nm.
% [% _9 _( }' X" E5 bDecision:/ \' R" I* }, W5 ^
The torque test values in Table XIII are not excessive. This table could be re-examined in the
4 Q; S8 D# ?! I! o5 \8 [3rd edition of IEC 60601-1.
0 T+ X) ^' f0 S/ k/ g( y g4 ], `6 f2 I6 d- ^
; ?( G! o0 U1 I1 M3 l6 I6 M; Q
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