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|  DSH 429
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+ q8 ?3 V1 w; e! o( f' N( a | Thermocouple vs. resistance method& O' L1 n& f8 b* \; j2 p- D
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/ Y4 P/ r& K+ b! [" c, k0 W | 60601-1(ed.2);am1;am2' k$ a- {5 Q3 q, ]
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" m! ?7 p4 H6 kStandard(s)- (year and edition):5 H# A+ Q. k4 X/ z7 U9 a
IEC 60601-1:1988 Ed.2 Am1+Am2! z5 }- T$ w1 ~
Sub clause(s): 421 R6 s) `7 [( ^$ L
Sheet n°: DSH-429
7 L, H5 f6 c" _$ N1 vSubject: Thermocouple vs. resistance method
/ O5 {$ K, J" t) A* W1 V8 r& HKey words: Temperature, thermocouple, resistance method, windings
& ~4 i7 d6 F' b- \( XConfirmed by CTL at its 39th meeting, in Cologne# @6 e0 V5 h: E
Question:. V" F* i, x- T' C* W/ A" ~1 C
Use of thermocouple instead of resistance method? Can the allowable values in Table Xa and
$ E0 T$ `8 V! b _0 DTable Xb be reduced by 10°C if temperature determined by thermocouples (like IEC 60950/ s: f. U7 ^8 ~4 f
Cl.5.11, Ed. 2)?$ q" g, @5 m6 U! K/ u
Decision:
" j; i. Q9 j# v. v' A' DThe allowable maximum temperatures given in Table Xa and Table Xb apply, regardless of the1 x) M& z( d4 |& u O% ]6 g1 @
test method. However, the systematic errors and uncertainties in any measurement must be8 B& l$ p$ k& M: T( C
considered when comparing the measured value to the required value. COR method should+ y6 _+ ^* [& M! g ]8 M2 A
be utilized whenever possible. If not possible, the allowable limit of Table Xa and Table Xb: ?6 h" P7 H5 {; n
must be reduced by 10°C.8 y; d; F6 E! M* j& i4 |* c. p
A3 o! n/ F1 g( i) u7 X# I" h9 J/ K7 n; C- [$ Z# U
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