DSH 429 Thermocouple vs. resistance method

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DSH 429

Thermocouple vs. resistance method # w9 j4 Y- W! T/ z

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60601-1(ed.2);am1;am2

Standard(s)- (year and edition):
IEC 60601-1:1988 Ed.2 Am1+Am2
Sub clause(s): 42
' i8 v0 Z( V+ X1 ?& Q3 lSheet n°: DSH-429
: v7 m3 I3 ?" m9 X. S2 rSubject: Thermocouple vs. resistance method
' g$ d/ B& w0 J9 `Key words: Temperature, thermocouple, resistance method, windings
Confirmed by CTL at its 39th meeting, in Cologne
, v# W: J0 ^# a' Z$ SQuestion:
5 @$ a4 ]4 h; p7 K. W( e0 }3 sUse of thermocouple instead of resistance method? Can the allowable values in Table Xa and
Table Xb be reduced by 10°C if temperature determined by thermocouples (like IEC 60950
Cl.5.11, Ed. 2)?
Decision:
4 v3 T: N- K; l" A# Z2 W7 pThe allowable maximum temperatures given in Table Xa and Table Xb apply, regardless of the
) u, a1 s" S# O7 ?" S" g- V) ztest method. However, the systematic errors and uncertainties in any measurement must be
5 ^* V+ t2 P: O/ b9 Uconsidered when comparing the measured value to the required value. COR method should
4 l8 K- w  R. `- D) X1 C9 zbe utilized whenever possible. If not possible, the allowable limit of Table Xa and Table Xb
; _. T" ^+ B, ]5 \must be reduced by 10°C.
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