67
11 Calibration Procedure
Calibration Example
R0 = 100.000
ALPHA = 0.0038500
t
L
= 80.00°C
measured t = 79.843°C
t
H
= 120.00°C
measured t = 119.914°C
Compute errors,
err
L
= 79.843 - 80.00°C = -0.157°C
err
H
= 119.914 - 120.00°C = -0.086°C
Compute R0
′
,
R
.
.
.
)
.
.
.
0
0 086
80 0
0157
120 0
120 0
80 0
′ = −
×
− −
×
−
(
)
(
0 00385
1 100 000
100115
.
.
.
+
⎡
⎣⎢
⎤
⎦⎥
=
Compute ALPHA
′
,
ALPHA
′ =
+
×
−
− +
×
(
.
. )(
.
)
(
.
. )(
1
0 00385 120 0
0157
1
0 00385
80 0
−
−
+
⎡
⎣
⎢
⎤
⎦
⎥
=
0 086
120 0
80 0
1 0 00385
0 0038387
.
)
.
.
.
.
Figure 8
Calibration Example
