() R (t). , () . - , , , (), (). .
a (), dR , , R. dt :
a = (dR / dt) ּ (1/ R) (1)
() -
, , ( ) . 䒺 , , , .
R :
R = C ּ ekT, (2)
k , ,
; , , k - -
; ; , .
, , t(C) , : T()= t(C) + 273.15, (2) t(C) :
R = C ּ ek(273.15 + t) = C ּ e273.15k ּ ekt. (3)
: C ּ e273.15k = R0
0 : R = R0 ּ ekt. (4)
k
, (4) ,
:
R = R0 ּ ekt = f(0) + f (0) + f (0) + f (0) +=
= R0 (1+ t + t + t +) = R0 (1+ a ּ t + b ּ t2 + γ ּ t +), (5)
f(0) f (0), f (0), f (0),... (3) .
(, , , ) : ■ R = f(t); ■ , 䳿 ; ■ α, 0 100 C : α=(R100-R0)/ (R0 * 100), R0 R100 - 0 C 100 C , . a 4*10 (1/).
|
|
, ( 50 +180 )
-260 +650.
0,07, - (, ) - , , ( , -- ) . - (.1) () , 璺- -, 䒺 . , , , .
R = f(t) . (4):
R = R0 ּ (1+a*t), (6), a = 4,26ּ10 -3 1/.
(4) 0:
Rn = R0n ּ (1+a ּ t+b ּ t2), ( 7)
a = +3,968ּ10-3 1/; b = -5,847ּ10 -7 1/.
< 0 4- (4).
() R0
0 .
R0 10, 50,
100 : 10, 50, 100.
R0n 0 , 㳿 , R0n : 1, 5, 10, 50, 100, 500.
,
. 0 (R0) ,
,
W100, : R100/R0, , 100 0 , . , 50 W100 = 1,426; 50 W100 = 1.391.
( , , R0n 0,05%, R100/R0 1,391 0,0007) ( ), 2- 3-
0.3... 0.5 1...2 .
, ,
|
|
,
.
"" (50), - (50) . - 0288(0289) - 0288(0289) 4...20 , - 0388 0388 . . ij 8 10 .
-1 (. ) 1 , , - ᒺ . - ᒺ : 80; 100; 120; 160; 200; 250; 320; 400; 500 ( ). ( - 1) ( 㳿 TF2) .
0,25; 0,4; 0,5; 0,6 1%. 150 000. ( )
-40 +125.