DSH 406 The adequacy of the knob/shaft mechanical link

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DSH 406 + d9 L" q8 Y' U( y9 p ) J+ v0 u8 j* L" T. D+ e

The adequacy of the knob/shaft mechanical link 1 u5 g4 G5 H) k. [2 P6 g* x* e) O

56.10 b) 3 L) B$ ~) Z) s

60601-1(ed.2);am1;am2 0 c( D* t- W- y0 Z; Z2 n+ s

- A2 G. h9 d. ZStandard(s)- (year and edition):
IEC 60601-1:1988 Ed.2 Am1+Am2
Sub clause(s): 56.10 b)
Sheet n°: DSH-406
" Q8 @$ J0 L  F4 W- I% nSubject: The adequacy of the knob/shaft mechanical link
; _" o: ]: M+ ~% j$ M7 i3 |4 S, BKey words:  Knob, torque
6 T9 m0 f0 a8 NConfirmed by CTL at its 39th meeting, in Cologne
Question:
, B( j7 z* Z8 C% A% e" ha) The criteria is that the knob shall not rotate with respect to the shaft. This does not cover the
3 u1 c) }- [) r! H; u5 S2 G% ~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
. }' j; p6 Y; p7 I3 L9 V& Sto 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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