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TDMS File Format

TDM/TDMS File Format

The Technical Data Management file format, or TDM, is a hierarchical, binary data file format designed to store data from common test and measurement applications. The Technical Data Management Streaming format, TDMS, was introduced by National Instruments to facilitate high speed data streaming in a structured and easily exchangeable data file format. TDMS files are often employed by LabVIEWTM and other National Instruments applications.

A TDM/TDMS file is organized in terms of groups and channels where a single file can contain multiple groups and a single group can contain multiple channels. This format is analogous to DADiSP's own internal Dataset (group) and Series (channels) data storage scheme. In addition, each file, group and channel can contain multiple user defined properties to help document the data.

When processing a TDM/TDMS file, an auto-generated index file optimizes access to the data parameters, increasing the speed of read operations on large data files.

TDMS Load Interface


DADiSP/TDMS directly loads TDM/TDMS data files and automatically sets sample rate, time offset and engineering unit information for each channel. The channels can be loaded into separate Windows or combined into a single Window for display. Channel loading is optimized and buffered to provide quick access to large data files. X values can be specified from a common X channel and irregularly spaced series can be converted to more efficient regularly spaced series.

TDMS Export Series

DADiSP/TDMS allows one or more DADiSP dataset series to be saved to a TDM/TDMS file. Each dataset name is mapped to a TDM/TDMS group name and each series name is mapped to a TDMS Export Interface TDM/TDMS channel name. New series can be added to existing TDMS files.

TDMS Data Formats

A variety of binary data formats are supported, including 8-bit integer, 16-bit integer, 32-bit integer, 64-bit integer, single and double precision float values

Simple Menu Interface

DADiSP/TDMS runs from the DADiSP worksheet and is accessed by a press of a button. The TDMS user interface displays important file information and supports the selection of individual TDMS groups and channels.

Full Analysis System

DADiSP provides a complete analysis, display and processing environment using TDMS data. The integration of DADiSP/TDMS into DADiSP makes it easy to automate data import and analysis applications through SPL (Series Processing Language), macros, and command files.


DADiSP/TDMS requires DADiSP 6.7 B01 or higher. Contact us for information about updating your current version of DADiSP.

(1) TDMS file image copyright by National Instruments.

(2) LabVIEW is a trademark of National Instruments.

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