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CTL中有这么一句话:
* f9 s+ ]" O$ e/ @/ gThermocouple not included in the Instrument accuracy of measuring range. Thermocouples type “K”, “T”$ \9 v2 K# {- t9 G* W1 |
and “ J”, premium grade, are recommended.7 z$ R1 _8 y# b8 }5 l
Switching power supplies present an electrically noisy environment for test instrumentation. When5 o1 z) ?9 Z* R* j/ v
measuring temperatures on and within switching power supplies, thermocouples are in the immediate
0 g. E5 G t }' k" f2 uvicinity or in intimate contact with component sources of the electrical noise. Type J thermocouples are3 X' P7 P6 _/ U3 i. b, I: O
made of material that is magnetic. Type K thermocouples are made of material that is slightly magnetic.
' d8 e0 U1 T: l/ ?. W1 N0 p4 B. | rType T thermocouples are made of non magnetic materials. As a result Type T thermocouples are. K# [; j. e4 i/ I- z
affected less by the high frequency magnetic fields present and give more accurate results.7 c+ \/ z. j: r, z- j
+ O- L" _7 I5 F* Z5 K; l
也就是说实验室尽量要用T type热电偶? |
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