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7102
User's Guide
12-2
12.2 Calibration Procedure
1. Choose three set-points to use in the calibration of the R0, ALPHA, and
DELTA parameters. These set-points are generally 40.0 °C, 95 °C, and
195.0 °C but other set-points may be used if desired or necessary.
2. Set the bath to the low set-point. When the bath reaches the set-point and the
display is stable, wait 15 minutes or so and then take a reading from the
thermometer. Sample the set-point resistance by holding down the “SET” key
and pressing the “DOWN” key. Write these values down as T1 and R1
respectively.
3. Repeat step 2 for the other two set-points recording them as T
2
, R
2
, T
3
, and R
respectively.
4. Using the recorded data, calculate new values for R0, ALPHA, and DELTA
parameters using the equations given below:
12.2.1 Compute DELTA
A = T
3
− T
2
B = T
2
− T
1
−
−
−
=
100
1
100100
1
100
22
33
TT
TT
C
−
−
−
=
100
1
100100
1
100
1122
TTTT
D
E = R3 − T
2
F = R2 − T
1
CFDE
BEAF
delta
−
=
=
T
1 − 3
– Measured temperature using thermometer.
T
1 − 3
– Value of R from display of 7102 (Press SET and DOWN at the same time.)
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