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CTL中有这么一句话:
# R+ o e" e' `% GThermocouple not included in the Instrument accuracy of measuring range. Thermocouples type “K”, “T”
" x4 c/ j3 E% `" h, h( Vand “ J”, premium grade, are recommended.
- `4 d' g) p" e {& e, T8 z) k9 X& WSwitching power supplies present an electrically noisy environment for test instrumentation. When
* o/ x J4 ]9 m. xmeasuring temperatures on and within switching power supplies, thermocouples are in the immediate) h7 ?- x/ J$ q3 r5 H% O/ D
vicinity or in intimate contact with component sources of the electrical noise. Type J thermocouples are
4 q d1 l9 o- g+ Q/ C, `) o6 Xmade of material that is magnetic. Type K thermocouples are made of material that is slightly magnetic.; {7 A$ x% E2 S3 W' B
Type T thermocouples are made of non magnetic materials. As a result Type T thermocouples are Y: e/ G9 i$ U A' a0 l
affected less by the high frequency magnetic fields present and give more accurate results.: n% A8 F8 _- S# E, R6 d9 \
8 _; u* m* ?* y& Y5 R0 u8 e也就是说实验室尽量要用T type热电偶? |
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