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标准上有的:
; e. z4 x$ T0 ], f NTo allow for the fact that the average temperature of windings of universal motors, relays, solenoids and
8 ?; a6 K$ V3 c! u( U: _. r' Bsimilar components is usually above the temperature at the points on the windings where thermocouples are3 W( W- N0 s' F' y) v' @, e
placed, the figures without parentheses apply when the resistance method is used and those within+ z5 t% T( [7 g& f8 }9 g6 p6 B: Z
parentheses apply when thermocouples are used. For windings of vibrator coils and a.c. motors, the figures
! D$ U& z: M) N/ h6 O/ y) Owithout parentheses apply in both cases.8 w8 K) b" @- G+ s# T) e% f
......0 W1 O/ U& ^) m1 k% w
简单来说,基本上括号内的适用于热电偶发,括号外适用于电阻法 |
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