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Calibration Procedure
12.2 Calibration Procedure 12
12-3
where
T
1
and R
1
are the measured temperature and resistance at 50.0 °C
T
2
and R
2
are the measured temperature and resistance at 90.0 °C
T
3
and R
3
and R are the measured temperature and resistance at 150.0 °C
12.2.2 Compute R0 & ALPHA
−
+=
100
1
100
11
11
TT
deltaTa
−
+=
100
1
100
33
33
TT
deltaTa
31
3113
aa
aRaR
rzero
−
=
=
3113
31
aRaR
RR
alpha
=
−
=
Where:
delta is the new value of DELTA computed above
Program the new values for DELTA (delta), R0 (rzero), and ALPHA (alpha) into
the Micro-Bath with the following steps.
• Press “SET” and “EXIT” keys at the same time and then press “UP” until
“CAL” is displayed.
• Press “SET” five times until “R0” is displayed.
• Press “SET” then use the “UP” or “DOWN” keys until the correct numerical
setting is displayed. Press “SET” to accept the new value.
• Repeat step 2 for ALPHA and DELTA.
12.2.3 Accuracy & Repeatability
Check the accuracy of the Micro-Bath at various points over the calibrated range.
If Micro-Bath does not pass specification at all set-points, repeat the Calibration
Procedure.
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