GE PhastSystem User Manual page 63

5. Press " ", "CE", and enter the Ct factor for 50°C, for
example, 2.6:
DEV 7 Ct(5,30,40,50)°C = (0.5,1.3,2.0,2.6)
Important! When you program a method using temperature
compensation, you must program the process time t, as
the time required to process the step at 20°C, regardless
of the temperature you plan to run the step at.
Running the method
Use the procedures for running development methods described at
the beginning of the section.
Monitoring the method
When a method is running, the time shown on the display is based on
the process time at 20°C and does not correspond to real time. In
other words, the display time will elapse slower of faster than real
time depending on the temperature of the solution in the chamber.
The following example will help clarify this:
A method is programmed with the following Ct curve:
DEV 7 Ct(5,30,40,50)°C = (0.5,1.3,2.0,2.6)
The first step in the method is programmed as follows:
DEV 7.01 IN = 1 OUT = 0 t = 10.0 min T = 50°C
That is, the time for this process at 20°C is 10 minutes, and it will be
processed at 50°C.
When the step is running, the display time will start at 0.0 minutes
and count up to 10 minutes. But the actual time taken to reach this
display time (10 min.) may only be 4 minutes since the step is run at
50°C. When the temperature of the solution in the development
chamber is below 20°C, the display time will elapse slower than real
time. When the temperature is above 20°C, the display time will
elapse faster than real time. When the display time reaches 10
minutes, the step terminates and the next step begins.
The display time will be equal to real time when the temperature
compensation function is not used, that is, when all Ct factors are set
to 1.0.
5. Operation
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