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CTL中有这么一句话:4 b! b+ h- u2 i. d. ~) T$ m& @
Thermocouple not included in the Instrument accuracy of measuring range. Thermocouples type “K”, “T”8 y/ [) l1 I8 G' I
and “ J”, premium grade, are recommended.- B" y- p0 r( t+ A9 V8 @
Switching power supplies present an electrically noisy environment for test instrumentation. When) M, R5 i1 i$ T( E5 `
measuring temperatures on and within switching power supplies, thermocouples are in the immediate
( U2 L3 s* K9 ~: w3 p( } vicinity or in intimate contact with component sources of the electrical noise. Type J thermocouples are% M. X! y) V* i+ @5 ]; v) `
made of material that is magnetic. Type K thermocouples are made of material that is slightly magnetic." [: P7 _9 E Q) m" Z
Type T thermocouples are made of non magnetic materials. As a result Type T thermocouples are3 }' R& Y3 J6 k6 S$ e
affected less by the high frequency magnetic fields present and give more accurate results.
; A+ C. I1 E9 x* @4 Z$ n! {# }: l$ X! K8 I# B: ^8 f
也就是说实验室尽量要用T type热电偶?( x! K4 E& @: f5 |$ b
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