ThermoWorks 9009-B INDUSTRIAL DUAL-BLOCK CALIBRATOR - Manual (Page 41)

C
T T T T
= ⎡
⎣⎢
⎤
⎦⎥
−
⎡
⎣⎢ ⎤
⎦⎥
− ⎡
⎣⎢
⎤
⎦⎥
−
⎡
⎣⎢ ⎤
⎦
4 4 3 3
100
1
100 100
1
100 ⎥
D
T T T T
= ⎡
⎣⎢
⎤
⎦⎥
−
⎡
⎣⎢ ⎤
⎦⎥
− ⎡
⎣⎢
⎤
⎦⎥
−
⎡
⎣⎢ ⎤
⎦
3 3 2 2
100
1
100 100
1
100 ⎥
E R R
= −
4 3
F R R
= −
3 2
delta
AF BE
DE CF
=
−
−
Where:
T
1-4
- Measured temperature using thermometer.
R
1-4
- Value of R from display of 9009 (Press SET and DOWN at the same
time.)
where
T
1
and R
1
are the measured temperature and resistance at –15 °C
T
2
and R
2
are the measured temperature and resistance at 0 °C
T
3
and R
3
are the measured temperature and resistance at 60 °C
T
4
and R
4
are the measured temperature and resistance at 110°C
10.2.2 Compute R0 & ALPHA
a T delta
T T
1 2
2 2
100
1
100
= +
⎡
⎣⎢ ⎤
⎦⎥
−
⎡
⎣⎢ ⎤
⎦⎥
a T delta
T T
3 4
4 4
100
1
100
= +
⎡
⎣⎢ ⎤
⎦⎥
−
⎡
⎣⎢ ⎤
⎦⎥
rzero
R a R a
a a
=
−
−
4 1 2 3
1 3
alpha
R R
R a R a
=
−
−
2 4
4 1 2 3
Where:
delta is the new value of DELTA computed above
10.2.3 Compute BETA (Cold Side Only)
x
T
= ⎡
⎣⎢
⎤
⎦⎥
− 1
100
1
9009 Industrial Dual-Block Calibrator
User’s Guide
38