DSH 429 Thermocouple vs. resistance method

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DSH 429

Thermocouple vs. resistance method 1 [; D' y1 U9 M) _5 J

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60601-1(ed.2);am1;am2 ! ?8 W0 R- H  X5 G8 n/ X+ ~" @

Standard(s)- (year and edition):
IEC 60601-1:1988 Ed.2 Am1+Am2
Sub clause(s): 42
3 ?( O3 A2 J3 G2 J- F& ZSheet n°: DSH-429
Subject: Thermocouple vs. resistance method
: I7 O6 j9 c1 _* S! }Key words: Temperature, thermocouple, resistance method, windings
+ W5 R; s3 J8 F9 ~7 V: e2 B5 BConfirmed by CTL at its 39th meeting, in Cologne
2 s2 V" m1 F# G6 b# u8 h. f. i2 D5 wQuestion:
Use 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:
The allowable maximum temperatures given in Table Xa and Table Xb apply, regardless of the
test method. However, the systematic errors and uncertainties in any measurement must be
. ?1 a# Y; ]9 L7 X0 {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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