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|  DSH 429
/ q# x* f5 U6 E" Y" G- q( o+ u; h$ z; u9 b$ S+ N" P2 g
| Thermocouple vs. resistance method9 ]$ |8 V* g( j& R
| 42# G; o5 P" G( b8 J" ?% \. g
| 60601-1(ed.2);am1;am2
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Standard(s)- (year and edition):
) l0 j9 Q7 C; e7 ?- P9 v. VIEC 60601-1:1988 Ed.2 Am1+Am2" }, k0 ]* f% Y+ M" x
Sub clause(s): 42, ]6 G0 \2 d, \0 [0 P
Sheet n°: DSH-4296 G5 d9 c2 ^% m
Subject: Thermocouple vs. resistance method+ f. o8 _3 h9 A5 }8 p4 t; Y
Key words: Temperature, thermocouple, resistance method, windings
" o# d. s/ K4 o1 I6 D# v3 ^, OConfirmed by CTL at its 39th meeting, in Cologne# X& W+ d3 Z5 s/ x6 K
Question:. s. |# G+ D/ Z- S( V9 b: w
Use of thermocouple instead of resistance method? Can the allowable values in Table Xa and; W( b9 m. Y0 i8 u$ H" E9 u
Table Xb be reduced by 10°C if temperature determined by thermocouples (like IEC 60950
4 H) v$ C# {6 K' J# |Cl.5.11, Ed. 2)?
5 b' U$ z# o' j& z0 L( ^ p5 f- xDecision:
7 d8 w" c5 {# W! M, L8 A7 f0 [4 FThe allowable maximum temperatures given in Table Xa and Table Xb apply, regardless of the$ p7 ^' I* V. W7 K/ w6 m
test method. However, the systematic errors and uncertainties in any measurement must be
2 G5 }" b8 \9 `considered when comparing the measured value to the required value. COR method should) {. Y0 o4 g3 C' p* S
be utilized whenever possible. If not possible, the allowable limit of Table Xa and Table Xb
! J( u+ h$ t7 tmust be reduced by 10°C.4 A' u" d9 e4 r
4 F' G3 y [1 c! a+ A G! ^! {8 Z3 Q* ]' z+ T) _
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