App-27
IM DL850E-01EN
Appendix
Appendix 8 Using Data Files (WDF Files)
• To use the data in binary data files generated by the DL850/DL850V on a PC, use the “DL850/DL850V WDF
File Access Library” provided by YOKOGAWA.
• To convert data into YOKOGAWA
’s legacy file format (*.WVF + *.HDR), use the “Binary Data File Converter”
provided by YOKOGAWA.
• To view the data in WDF files without using the “DL850/DL850V WDF File Access Library,” refer to the
following information.
The information does not apply to files created using real-time hard disk recording or free-run recording on
the DL850/DL850V. To use the data in these types of files, use the “DL850/DL850V WDF File Access Library”
provided by YOKOGAWA.
Information for Viewing Data in WDF Files
WDF File Structure
A WDF file is made up of a common header block and blocks of data organized by type, which are referred to
as chunks. Chunks are analogous to boxes that data is placed in. Multiple chunks are strung together to form a
single WDF file. A special chunk called “FeND chunk” that contains no data always appears at the end of a file
(except for waveform files divided into multiple files).
Common header block
Chunk
Chunk
FeND chunk
Multiple chunk
•
•
Common Header Block
The main role of the common header block is to indicate that the file is a WDF waveform file. An identifier is
contained in the first four bytes. The next four bytes indicate the size of the common header. The rest of the
common header block is undisclosed.
Offset Type Identifier byte Description
0x0000 CHR FileID 4 “%WDF”
0x0004 UINT Length 4 Common header size
0x000C - Data - Undisclosed
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