DSH 429 Thermocouple vs. resistance method

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DSH 429 ; _7 x5 V  B# y, ^  A' x

Thermocouple vs. resistance method

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

7 }( h. c, p% v! r7 u* RStandard(s)- (year and edition):
3 O5 B& n- }* O* TIEC 60601-1:1988 Ed.2 Am1+Am2
Sub clause(s): 42
; g3 x: {9 m5 o1 S/ g, RSheet n°: DSH-429
  P- d6 w. ^1 ?/ xSubject: Thermocouple vs. resistance method
Key words: Temperature, thermocouple, resistance method, windings
/ ~2 {& m& s" G, ^* }$ i% |( Y2 WConfirmed by CTL at its 39th meeting, in Cologne
( W& X2 ?5 m4 v* o+ p# EQuestion:
Use of thermocouple instead of resistance method? Can the allowable values in Table Xa and
9 P7 g% K8 o2 e4 Y4 h; bTable Xb be reduced by 10°C if temperature determined by thermocouples (like IEC 60950
Cl.5.11, Ed. 2)?
Decision:
The allowable maximum temperatures given in Table Xa and Table Xb apply, regardless of the
1 L9 ?+ K! x6 c9 z' M3 Ntest method. However, the systematic errors and uncertainties in any measurement must be
considered when comparing the measured value to the required value. COR method should
be utilized whenever possible. If not possible, the allowable limit of Table Xa and Table Xb
must be reduced by 10°C.
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