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The first window displayed, after you select a data file to open, is the

Data File Information window, shown in the figure below.

Figure 2.2 Data File

Entering Data File Information

Table 2.1 Data File

Information Items

Successful analysis of the data is dependent upon the information con- tained in this window. You need to verify and/or correct this information before beginning the analysis.

Follow the steps below to use this window:

1. Verify or edit the sample name, sample size, operator, method used, and comments on this file.

2. Click on the drop-down list to choose the direction desired for the exotherm, if applicable.

3. Enter or edit the cell constant, if applicable.

4. If the data file contains saved analysis results, you can check the Restore analysis checkbox to return the data file back to the state it was in when Save Analysis was selected-it cancels any analysis and rescale conditions selected after the analysis was saved.

5. Click on any of the buttons at the top of the window to change the:

Signals, Units, Instrument Parameters, or Data Limits.

6. Click the OK button when completed.

The following table provides a brief description of each item displayed on the Data File Information window.

Item Description File

Information This is a display-only field that shows the data file name and date the file was generated.

Module Type This is a display-only field that shows the type of instrument used to gather the data.

Sample Name Enter the identification of the sample material used

in this experiment. Up to 32 characters may be entered. This information will appear in the plot header of the printed graph.

Sample Size Enter the sample weight in the appropriate units. This information will appear in the plot header of the printed graph.

Operator Enter the name used to identify the person con- ducting the thermal analysis experiment. Up to 25 characters may be entered. This information will appear in the plot header of the printed graph.

Table 2.1 Data File

Information Items (continued)

Item Description

Comments Enter additional text to help describe the experi- ment, for example, sample treatment or experimen- tal conditions could be included. Up to 64 charac- ters may be entered. This information will appear in the plot header of the printed graph.

Method Use this field to enter a short description of the method used to gather this data file. A method file contains an ordered list of segments that will instruct the instrument's functions throughout the course of the experiment. This information will appear in the plot header of the printed graph.

Exotherm Select Exotherm Up to plot your heat flow or

Up/Down temperature difference data in the traditional TA Instruments format, with the exothermic portion of the curve in the upward direction. Select Exo- therm Down to plot your data with the exothermic portion of the curve in the downward direction. (See the next section for an example.)

Cell Constant Cell Constant is a calibration factor used to adjust

the calorimetric response of a DSC cell or the thermal expansion of a TMA. The cell constant is the ratio of the known value to the measured experimental variable. Typically, either the heat of fusion of indium (DSC) or the expansion coeffi- cients of aluminum or copper (TMA) are used. The calibration is based on a run made in the calibration mode using the experimental conditions to be used in subsequent measurements.

Restore Check this box to return the data file back

analysis to the state it was in when Save Analysis was selected—it restores any analysis and rescale conditions selected if the analysis was saved.

OK Button Use OK to save the information entered on the window.

Table 2.1 Data File

Information Items (continued)

Item Description

Cancel Use the Cancel button to abort the operation.

Button

Help Button Use Help to access Help information for the window shown.

Previous Use the Previous button to return back to the

Button Open Data File window, which allows you to

select and open a different data file.

Units Button Use the Units button to access the Unit Selection window, which allows you to specify the units to be used when the data is graphed.

Instr Params Use the Instrument Parameters button, when

Button available, to access the Instrument Parameters window for the data file displayed. This option is only available when a DMA or Modulated DSC file is opened.

Signals Button Use the Signals button to access the Signal Selection window, which allows you to specify

signals from the data file to be graphed.

Data Limits Use the Data Limits button to access the Data

Button Limits window, which allows you to specify a

region of the data to be graphed using either Full Range, Time Limits, or Temperature Limits.

Same As Use the Same As button to copy the settings used

Button in another file to the current file. The settings that are copied include the signals and units selected, graph options, baseline file (if applicable), smooth- ing, and X-axis scaling.

The Same As button is only available when multiple files are open.

NOTE: