26 Rev 007, 04/12
© SP Scientific 2012
It and dt
Measure the period of the temperature oscillations, peak temperature to peak
temperature.
Integral Time =It =
Derivative Time = dt=
=
Example:
Time
Program the results into the controller using the instructions outlined in PID tuning.
CCt
To determine the Cool Cycle Time (CCt), run the unit at the temperature that you wish
the it to control best (i.e. the setpoint). The temperature will probably oscillate as the
controller attempts to maintain temperature at the setpoint.
Watch the Cool Light.
Start a stopwatch when the Cool LED comes on, wait for the LED to go off, and stop
the stopwatch when the temperature begins to rise again.
Set the value of CCt = time on the stopwatch (in seconds).
Example:
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