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CTL中有这么一句话:; V9 s* E* b$ |8 h% r0 Q
Thermocouple not included in the Instrument accuracy of measuring range. Thermocouples type “K”, “T”( l' P: C8 ?, L% a2 R# \
and “ J”, premium grade, are recommended.5 `1 [9 B# F/ q
Switching power supplies present an electrically noisy environment for test instrumentation. When0 t$ d9 J- e' z# k+ V! |
measuring temperatures on and within switching power supplies, thermocouples are in the immediate
9 v# f7 n7 d* _vicinity or in intimate contact with component sources of the electrical noise. Type J thermocouples are
% H6 ^) P5 W6 q& d; T0 ~made of material that is magnetic. Type K thermocouples are made of material that is slightly magnetic.
5 u( r9 P7 H' |Type T thermocouples are made of non magnetic materials. As a result Type T thermocouples are3 t: s% L% _/ @
affected less by the high frequency magnetic fields present and give more accurate results.7 S! E* w1 V& `+ m# w
) j5 o8 K. V8 a9 n
也就是说实验室尽量要用T type热电偶? |
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