Compute R0 And Alpha - Fluke 9132 User Manual

9132 Portable IR Calibrator
User's Guide
9.2.2
36
= −
B T T
2 1
⎡ ⎤ ⎡ ⎤
T T
= − −
3 3
C 1
⎣ ⎢ ⎦ ⎥ ⎣ ⎢ ⎦ ⎥
100 100
⎡ ⎤ ⎡ ⎤
T T
= − −
2 2
D 1
⎣ ⎢ ⎦ ⎥ ⎣ ⎢ ⎦ ⎥
100 100
= −
E R R
3 2
= −
F R R
2 1
−
AF BE
=
delta
−
DE CF
T - Measured temperature using a thermometer
1-3
R – Value of the set-point resistance from the display. (Press SET and
1-3
DOWN at the same time.)
Where:
T and R are the measured temperature and resistance at 50.0°C
1 1
and R are the measured temperature and resistance at 200.0°C
T
2 2
T and R are the measured temperature and resistance at 350.0°C
3 3

Compute R0 and ALPHA

⎡ ⎤ ⎡
T
= +
1
a T delta
⎣ ⎢ ⎦ ⎥ ⎣ ⎢
1 1
100
⎡ ⎤ ⎡
T
= +
3
a T delta
⎣ ⎢ ⎦ ⎥ ⎣ ⎢
3 3
100
−
R a R a
=
3 1 1 3
rzero
−
a a
1 3
−
R R
=
1 3
alpha
−
R a R a
3 1 1 3
Where:
delta is the new value of DELTA computed above
Program the new values for DELTA (delta), R0 (rzero) & ALPHA (alpha) into
the instrument using the following steps.
1. Press the SET and EXIT keys at the same time and then press SET until
R0 is displayed.
⎡ ⎤ ⎡ ⎤
T T
−
2 2
1
⎣ ⎢ ⎦ ⎥ ⎣ ⎢ 100 ⎥
⎦
100
⎡ ⎤ ⎡ ⎤
T T
−
1 1
1
⎣ ⎢ ⎦ ⎥ ⎣ ⎢ 100 ⎥
⎦
100
⎤
T
−
1
1
⎦ ⎥
100
⎤
T
−
3
1
⎦ ⎥
100