TDM File Format

TDM File Format

The TDM file format is the NI file format for saving measurement data. The TDM file format saves the signals acquired by the measurement hardware, the bulk data, and the descriptive data, the metadata, in separate files. Metadata could be the name and unit of a measurement channel and the name of the test engineer. The metadata is saved in the XML format (eXtensible Markup Language) in a file with the .tdm extension. The bulk data is saved in compact binary form in a file with the extension .tdx.

The Data model underlying the TDM file format structures the metadata into groups and channels, and adds user defined properties. The data model can identify whether an element is a group, a channel, or a property. This also applies to future expansions of the TDM file format.

NI software LabVIEW, DIAdem, and LabWINDOWS CVI support the TDM file format.

The TDM Header Writer from NI can be used by other products to create a TDM header file for existing binary files. NI can supply you with a TDM Header Writer.