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CTL中有这么一句话:" \% {6 f7 x, u, l% N6 q) R
Thermocouple not included in the Instrument accuracy of measuring range. Thermocouples type “K”, “T”8 C2 S3 `6 d$ g* J, ~
and “ J”, premium grade, are recommended.1 [% y1 A" E3 e: K6 H5 t+ b" ]1 g
Switching power supplies present an electrically noisy environment for test instrumentation. When
# k0 u2 S' S, ~$ L9 B# q+ Hmeasuring temperatures on and within switching power supplies, thermocouples are in the immediate
9 T8 b8 Z7 p! j7 c% s- t ~/ d3 Nvicinity or in intimate contact with component sources of the electrical noise. Type J thermocouples are
" C% e0 x/ w/ |: `4 ?' K+ rmade of material that is magnetic. Type K thermocouples are made of material that is slightly magnetic.
1 T6 V, I4 P7 N! _* q" }Type T thermocouples are made of non magnetic materials. As a result Type T thermocouples are) H- u9 @/ }4 |! p4 K+ M* z4 i/ d: g
affected less by the high frequency magnetic fields present and give more accurate results.* ]/ D7 X" s+ z4 [0 q+ z- ~( n/ @( o
0 w6 E& ?0 _# l; M% ~0 @; ]也就是说实验室尽量要用T type热电偶? |
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