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Standard(s)- (year and edition): 4 i% h- p; g/ G3 dIEC 60601-1:1988 Ed.2 Am1+Am2% ?! ?3 |. m; C8 N
Sub clause(s): 42 , L5 B' f1 f5 V ^ M7 wSheet n°: DSH-429# |& {$ e. |) _6 ]2 S+ h
Subject: Thermocouple vs. resistance method% z( M+ Q0 O% t$ n' l4 V
Key words: Temperature, thermocouple, resistance method, windings& T+ f) S7 R1 C
Confirmed by CTL at its 39th meeting, in Cologne ! u0 ^- M$ z9 e) E: jQuestion:+ W. k) d7 F% }7 L+ Q. Z1 C7 \3 p
Use of thermocouple instead of resistance method? Can the allowable values in Table Xa and) Q& u+ m- ]# @/ G
Table Xb be reduced by 10°C if temperature determined by thermocouples (like IEC 60950 3 y) O m2 l& j/ G0 PCl.5.11, Ed. 2)?* T7 e* a+ |% {* T! n: D
Decision: 8 J8 r. P' t& n% E8 sThe allowable maximum temperatures given in Table Xa and Table Xb apply, regardless of the 3 Y7 d+ d3 W4 utest method. However, the systematic errors and uncertainties in any measurement must be2 ?5 {1 @% W9 t: m% T9 @
considered when comparing the measured value to the required value. COR method should, G# X% U) |: @9 b9 V, Z' q
be utilized whenever possible. If not possible, the allowable limit of Table Xa and Table Xb ( N, O1 [: W" l4 ]; Nmust be reduced by 10°C. 0 X9 ~7 Z* n" c& S. g. z k2 V3 r4 t# N! F/ S9 l$ {/ G! v8 B P, z- J, |
[attach]77078[/attach]5 U6 q; A5 F! G8 N/ x
DSH 4290 `% N: B4 e }# k