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CTL中有这么一句话:$ ]# e2 v1 d) I8 B- f
Thermocouple not included in the Instrument accuracy of measuring range. Thermocouples type “K”, “T”
0 i. U, w0 W6 C+ h, N2 B |: F$ \0 i and “ J”, premium grade, are recommended.+ z v* I5 D2 G" y* y
Switching power supplies present an electrically noisy environment for test instrumentation. When
. _* R0 Z( o4 Z6 x- H measuring temperatures on and within switching power supplies, thermocouples are in the immediate7 @& G Y7 _+ f& _$ z5 M; M+ g
vicinity or in intimate contact with component sources of the electrical noise. Type J thermocouples are
. ]. @; [* D% e6 r) R- V made of material that is magnetic. Type K thermocouples are made of material that is slightly magnetic.
/ q$ u! f- B' j! q& N Type T thermocouples are made of non magnetic materials. As a result Type T thermocouples are6 q, K3 E6 P2 I3 H/ e$ C |! A
affected less by the high frequency magnetic fields present and give more accurate results.
( I/ g6 U5 O/ D9 @3 {: {, d% z1 R8 }& e$ J
也就是说实验室尽量要用T type热电偶?4 O$ a n5 g: P
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