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|  DSH 429
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5 _' t, [0 v$ T i1 r | Thermocouple vs. resistance method% _" s$ S, F) P' G: {# h3 z0 K
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| 60601-1(ed.2);am1;am29 [! c" ?6 @; h, `
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Standard(s)- (year and edition):
* B2 B3 _5 ?) \" ]8 h' dIEC 60601-1:1988 Ed.2 Am1+Am2' f( p: Y. G- r- }
Sub clause(s): 425 M1 r( f& L: y; |4 L
Sheet n°: DSH-4295 B& k3 L8 p. \+ { _
Subject: Thermocouple vs. resistance method2 O9 Y) a/ L; f& ?, L
Key words: Temperature, thermocouple, resistance method, windings
2 c( i8 a6 S6 s \Confirmed by CTL at its 39th meeting, in Cologne
9 z$ @/ b$ S& f* s! R5 M. IQuestion:
. [; K# L+ P5 [% ~- Q* v4 k; a" p- LUse of thermocouple instead of resistance method? Can the allowable values in Table Xa and
1 h+ O" l0 o- u: t/ WTable Xb be reduced by 10°C if temperature determined by thermocouples (like IEC 60950+ T1 Q5 v( \* s% ^. R
Cl.5.11, Ed. 2)?
# k/ G& I5 I0 ]Decision:
, L0 [ O6 f7 l7 a- ^The allowable maximum temperatures given in Table Xa and Table Xb apply, regardless of the
7 \& G! g% ^4 O7 p: u; Stest method. However, the systematic errors and uncertainties in any measurement must be& y* M' g4 r9 X: M; Y
considered when comparing the measured value to the required value. COR method should/ V, p; g0 x1 V* j9 A# P
be utilized whenever possible. If not possible, the allowable limit of Table Xa and Table Xb
- ]$ y9 q7 ~! t1 j2 r( Wmust be reduced by 10°C.6 Q" O1 g/ y4 b/ _ I9 j
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