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CTL中有这么一句话:5 J) s3 b* H9 s# N! X: e; }
Thermocouple not included in the Instrument accuracy of measuring range. Thermocouples type “K”, “T”" z- O6 f. `$ e- z6 P: x8 c
and “ J”, premium grade, are recommended.
8 {2 ]/ M+ Z! P' Y, P! U3 H# w Switching power supplies present an electrically noisy environment for test instrumentation. When$ R) D4 ?+ T0 p9 S) @
measuring temperatures on and within switching power supplies, thermocouples are in the immediate9 Y% Z7 @" c: j9 T; ~! `' h
vicinity or in intimate contact with component sources of the electrical noise. Type J thermocouples are
3 J1 h7 _9 v' ` b- D) S3 ?8 ^8 r& z made of material that is magnetic. Type K thermocouples are made of material that is slightly magnetic.. F: `+ D5 y$ ^, I; R6 e Y! m9 R
Type T thermocouples are made of non magnetic materials. As a result Type T thermocouples are
" K! w* `- l( i7 m) Q5 s, s. L affected less by the high frequency magnetic fields present and give more accurate results.( t* x* f/ c+ L- s* R) W* P
# T5 |. f% B" f8 [- @ 也就是说实验室尽量要用T type热电偶?& C U/ W* D& W' W/ H6 x
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