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CTL中有这么一句话:( M; {+ v! g7 X: x, l. i0 x
Thermocouple not included in the Instrument accuracy of measuring range. Thermocouples type “K”, “T”
5 E5 h1 K1 j" a9 `) j. U( m) @: X# S and “ J”, premium grade, are recommended.
" d9 P: ?! [% j% `9 N' G Switching power supplies present an electrically noisy environment for test instrumentation. When6 h' l+ h8 f6 y. T3 } J
measuring temperatures on and within switching power supplies, thermocouples are in the immediate
& {* o! k: V4 r vicinity or in intimate contact with component sources of the electrical noise. Type J thermocouples are4 T; U4 q* m, [' V2 s3 g2 L
made of material that is magnetic. Type K thermocouples are made of material that is slightly magnetic.
( T( y2 L, }0 @/ H* m: n. g Type T thermocouples are made of non magnetic materials. As a result Type T thermocouples are' G7 P; Y- a T8 w( S
affected less by the high frequency magnetic fields present and give more accurate results.
+ O' B% n2 p# U! D! g' ?. q
7 I9 Q9 ?8 a( a/ `& ~; u 也就是说实验室尽量要用T type热电偶?8 J& Y: J8 R; {$ i# v+ M9 r
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