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CTL中有这么一句话:
9 N: n+ f( |# m! C/ J Thermocouple not included in the Instrument accuracy of measuring range. Thermocouples type “K”, “T”6 z* w- G# b; f5 _$ W) U; U
and “ J”, premium grade, are recommended.
% ?& r s2 R# p& p& P) } Switching power supplies present an electrically noisy environment for test instrumentation. When" @9 e$ m$ O7 h# K
measuring temperatures on and within switching power supplies, thermocouples are in the immediate
9 A+ }6 Z+ m+ h m2 _6 ? vicinity or in intimate contact with component sources of the electrical noise. Type J thermocouples are. @7 x: l; z& \2 P3 l
made of material that is magnetic. Type K thermocouples are made of material that is slightly magnetic.% K& |2 i. N* ~9 w& D
Type T thermocouples are made of non magnetic materials. As a result Type T thermocouples are
8 q8 L6 E/ V& b/ o: c1 V affected less by the high frequency magnetic fields present and give more accurate results.
" j2 |6 Y+ I; n1 F" S) P8 ?4 p4 n! R0 U- c% D4 ?
也就是说实验室尽量要用T type热电偶?0 O3 c5 G$ S) Q' Y
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