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|  DSH 4299 j* v, Y, `/ p1 O- N
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| Thermocouple vs. resistance method
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% G4 |2 |' C( a8 H9 R7 @$ p& m" z | 60601-1(ed.2);am1;am24 s" [ A) x$ }
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Standard(s)- (year and edition):
+ A( H+ [* j/ e9 CIEC 60601-1:1988 Ed.2 Am1+Am2
. y. W) U/ J% x2 [8 ^/ ^0 C6 sSub clause(s): 42
. h3 e6 e% u" _$ ESheet n°: DSH-429" T" x+ Q) i" F3 H
Subject: Thermocouple vs. resistance method# V0 f: ]) u0 z+ ^
Key words: Temperature, thermocouple, resistance method, windings
- c4 x2 _! F* s, c( rConfirmed by CTL at its 39th meeting, in Cologne/ `, O; j# Z2 Y. A# F* J$ H& _+ p% X0 o
Question:
: {/ C8 ^& f6 a3 [% a$ Z" zUse of thermocouple instead of resistance method? Can the allowable values in Table Xa and
" R3 k& {9 K* c( ^3 gTable Xb be reduced by 10°C if temperature determined by thermocouples (like IEC 60950) i, b4 Q- p( p6 q- X5 s D
Cl.5.11, Ed. 2)?
; |0 ]9 j/ p! F# n# MDecision:1 [( f! V% m3 y
The allowable maximum temperatures given in Table Xa and Table Xb apply, regardless of the
4 U& _6 e4 s( V4 e% L+ N& Etest method. However, the systematic errors and uncertainties in any measurement must be- j9 b& H% p& N- S8 ], x; {
considered when comparing the measured value to the required value. COR method should
( h r! V; a( V5 o& ?. `be utilized whenever possible. If not possible, the allowable limit of Table Xa and Table Xb
9 z: I( i9 p9 x# |+ _$ smust be reduced by 10°C.
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