CTTTT
=⎡
⎣
⎢⎤
⎦
⎥−
⎡
⎣
⎢⎤
⎦
⎥−⎡
⎣
⎢⎤
⎦
⎥−
⎡
⎣
⎢⎤
⎦
3322
100 1100 100 1100 ⎥
DTTTT
=⎡
⎣
⎢⎤
⎦
⎥−
⎡
⎣
⎢⎤
⎦
⎥−⎡
⎣
⎢⎤
⎦
⎥−
⎡
⎣
⎢⎤
⎦
2211
100 1100 100 1100 ⎥
ERR=−
32
FRR=−
21
delta AF BE
DE CF
=−
−
T1-3- Measured temperature using thermometer.
R1-3 - Valueof set-point resistance from display of 9140. (Press SET and
DOWN at the same time.)
where
T1and R1are the measured temperature and resistance at 50.0 °C
T2and R2are the measured temperature and resistance at 200.0 °C
T3and R3are the measured temperature and resistance at 350.0 °C
10.2.2 Compute R0& ALPHA:
a T delta TT
11
11
100 1100
=+ ⎡
⎣
⎢⎤
⎦
⎥−
⎡
⎣
⎢⎤
⎦
⎥
a T delta TT
33
33
100 1100
=+ ⎡
⎣
⎢⎤
⎦
⎥−
⎡
⎣
⎢⎤
⎦
⎥
rzero Ra Ra
aa
=−
−
31 13
13
alpha RR
Ra Ra
=−
−
13
31 13
delta is the new value of DELTAcomputed above
5. Program the new values for DELTA (delta), R0(rzero) & ALPHA (alpha)
into the dry-well using the following steps.
a. Press the SET and EXIT keys at the same time and then press SET until
R0 is displayed.
9140 Dry-well Calibrator
User’s Guide
44