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CTL中有这么一句话:2 j1 f$ n1 U) Q$ u; _; W
Thermocouple not included in the Instrument accuracy of measuring range. Thermocouples type “K”, “T”0 g) Y: Z5 J. s! k2 I2 y
and “ J”, premium grade, are recommended.. z5 O V1 R5 B$ ]8 q( r7 d& \
Switching power supplies present an electrically noisy environment for test instrumentation. When2 M: D3 O9 E/ O7 V8 @
measuring temperatures on and within switching power supplies, thermocouples are in the immediate
( w9 X' L! L9 b% E9 `% R! ^5 ~vicinity or in intimate contact with component sources of the electrical noise. Type J thermocouples are, A6 D9 u5 m2 f" ]" ^$ l
made of material that is magnetic. Type K thermocouples are made of material that is slightly magnetic.
/ O* _" K8 i- wType T thermocouples are made of non magnetic materials. As a result Type T thermocouples are2 }3 }* K4 Y# D( ^% A' t! @1 j/ b
affected less by the high frequency magnetic fields present and give more accurate results.
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* a Q% d( h; c" P5 b+ j5 V, Q! x( @也就是说实验室尽量要用T type热电偶? |
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