User manual

9.2.1 Compute DELTA
AT T=−
43
BT T=−
32
C
TTTT
=
⎡
⎣
⎢
⎤
⎦
⎥
−
⎡
⎣
⎢
⎤
⎦
⎥
−
⎡
⎣
⎢
⎤
⎦
⎥
−
⎡
⎣
⎢
⎤
⎦
4433
100
1
100 100
1
100
⎥
D
TTTT
=
⎡
⎣
⎢
⎤
⎦
⎥
−
⎡
⎣
⎢
⎤
⎦
⎥
−
⎡
⎣
⎢
⎤
⎦
⎥
−
⎡
⎣
⎢
⎤
⎦
3322
100
1
100 100
1
100
⎥
ER R=−
43
FR R=−
32
delta
AF BE
DE CF
=
−
−
T
1– 4
- Measured temperature using the reference thermometer
R
1– 4
- Value of R from the 9133 display (Press SET and DOWN at the same
time)
Where
T
1
and R
1
are the measured temperature and resistance at –25°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 125°C
9.2.2 Compute R0 and ALPHA
a T delta
TT
12
22
100
1
100
=+
⎡
⎣
⎢
⎤
⎦
⎥
−
⎡
⎣
⎢
⎤
⎦
⎥
a T delta
TT
34
44
100
1
100
=+
⎡
⎣
⎢
⎤
⎦
⎥
−
⎡
⎣
⎢
⎤
⎦
⎥
rzero
Ra Ra
aa
=
−
−
41 2 3
13
alpha
RR
Ra Ra
=
−
−
24
41 2 3
delta is the new value of DELTA computed above.
9133
User’s Guide
36