Open TDMS File

This dialog is opened by selecting the Import -> NI (TDMS)... command from the File -> Import submenu and allows total control over the process of importing NI TDMS format files (*.tdms).

The controls in the upper side of the dialog provide basic information about the file being imported: its location (displayed in the Path label) and its size (displayed in the corresponding Size label).

The dialog also displays the structure of the TDMS file in a tree widget allowing the selection of the groups and channels to be imported. It is possible to enable/disable the import of an entire group or of individual channels by checking/unchecking the corresponding box situated on the right side of the selection tree. The same result can be achieved by right-clicking on the name of a group or channel and selecting the Import option from the pop-up menu.

A double-click on the name of a channel opens an information message box displaing the number of data values in this channel toghether with the list of its properties. The list of properties can also be displayed by right-clicking on the name of a channel and selecting the Properties option from the pop-up menu.

If the Preview box is checked QtiPlot displays a plot of the raw data values stored in the currently selected channel. The selection of the channels can be done either with the mouse or using the up and down arrow keys. The preview image is not available for channels containing strings or time stamps. If the raw data values have a complex type only the real part of the data is displayed by the preview plot.

Checking the Preview box also enables an input box that allows to limit the number of raw data values visible in the preview plot. By default this limit is set to one million. Choosing a limit lower than two automatically displays all data.

QtiPlot creates a new table for each group imported from the TDMS file. By checking the New Folder box these tables are moved into a subfolder inside the current folder of your project. The name of the new subfolder is generated automatically based on the name of the TDMS file.

Figure 5-235. The Open TDMS File dialog box.

The All check box allows to quickly toggle/untoggle the import of all channels from the TDMS file.

Figure 5-236. The TDMS channel properties dialog.