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CTL中有这么一句话：$ k, H u% f7 [0 t
Thermocouple not included in the Instrument accuracy of measuring range. Thermocouples type “K”, “T”) g% T7 X+ m5 I; Y0 r9 T; D
and “ J”, premium grade, are recommended.- b* `6 d2 w4 M
Switching power supplies present an electrically noisy environment for test instrumentation. When% d N5 q( @$ R8 g7 a1 V5 c
measuring temperatures on and within switching power supplies, thermocouples are in the immediate+ N7 P8 m0 j) f
vicinity or in intimate contact with component sources of the electrical noise. Type J thermocouples are
1 {' D( C9 h2 @0 {. U1 t made of material that is magnetic. Type K thermocouples are made of material that is slightly magnetic.+ W. k' c/ ?+ E1 n' `) B$ }
Type T thermocouples are made of non magnetic materials. As a result Type T thermocouples are9 h' Y' M- G( {* b7 j$ a
affected less by the high frequency magnetic fields present and give more accurate results.& ^2 |4 [. J0 {( b
) q, o( O5 K' Q( k( B 也就是说实验室尽量要用T type热电偶?
( N& \: G, ^0 f) H$ D* K |
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发表于 2017-3-9 16:01
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