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|  DSH 4063 v' C. }% o/ C' t- C. n3 }
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| The adequacy of the knob/shaft mechanical link
! ~5 k9 u$ o; _$ z/ ?5 w' K+ W: a3 t | 56.10 b)1 t. w! V1 q1 u* |) L+ x
| 60601-1(ed.2);am1;am2
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* G) \2 Y7 E# I) q# ]$ oStandard(s)- (year and edition):9 \8 E" N3 f9 Z8 ]. @# S3 [1 C
IEC 60601-1:1988 Ed.2 Am1+Am2
' T, u: O$ v3 \$ r% }$ GSub clause(s): 56.10 b)
& C( Y* O f' sSheet n°: DSH-406
; u/ K! c8 M+ a/ q) B' X1 d. lSubject: The adequacy of the knob/shaft mechanical link
4 a4 z; D% V4 A/ [Key words: Knob, torque. e9 b8 V* i5 o" O$ a* e1 K
Confirmed by CTL at its 39th meeting, in Cologne2 B3 N7 Z) [3 |* l
Question:
. \* z9 W7 Q* D9 E2 Na) The criteria is that the knob shall not rotate with respect to the shaft. This does not cover the0 h; I& z! H% R( j V$ `* ]0 Y2 F
possibility of internal damage to the controlling device e.g. potentiometer.: P5 O: y+ e5 }. I8 b/ W/ _: Q" f
b) The torque test values are too high. Maximum torque on a 10mm diameter knob was found$ f- r5 @6 v& L. W
to be <0.5Nm.
. B+ a c3 W/ C/ aDecision:
- s3 f9 h, g9 c. DThe torque test values in Table XIII are not excessive. This table could be re-examined in the
4 v( h) S4 z; x, I2 f/ W% t3rd edition of IEC 60601-1.
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