3 - 6
7)
At this time, the script has completed its function and a second dialog box, similar to
that Figure 3-4 .
Figure 3-4
Final Dialog Box Displayed by the TDC4 Auto Tune Script
8)
Select Ok to end the script. This will return the Framework to an empty window.
9)
The TDC4 will be ready to operate once its display goes to a display of the temperature.
Manually Tuning the TDC4
The following step by step procedure has been used to successfully tune the TDC4 using real
electrochemical cells.
The TDC4 is manually tuned with assistance from an Explain script provided with the Gamry Instruments
CPT110 Critical Pitting Test software. You must install your CPT110 software and verify CPT110 operation
prior to using this script.
1. Setup the System
a)
Set up the cell and its stirrer. The cell must be filled with liquid with roughly the same thermal
properties and volume as the solution that will be used in the electrochemical tests. In most
cases water can be used for tuning if later tests will use aqueous solutions.
b)
Hook up the heater to the TDC4 Output 1 and to the cell. Hook up the RTD to the TDC4 RTD
input. Place the RTD in the cell.
2. Initialization and Temperature settling
a)
Power up the TDC4 and the stirrer (if any).
NOTE: Stirring rate is an important tuning parameter. If the stirring rate changes drastically, you
may need to retune the system.
b)
Put the controller in SELF mode (refer to the iSeries User’s Guide). When you reenter Run mode,
the duty cycle will be displayed as Mxx.x, where xx.x is a duty cycle in percent.
Summary of Contents for TDC4
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