Logging signal data to file
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Accessible through menu option Signal tools/Log data in file or Data acquisition/Log data in file

Data acquisition operations can produce a large amounts of signal data which can not be stored in RAM. This function can be used in such cases to store all signal data from one data acquisition window in files on the hard-disk.

Also, you can use this function for a long-time instrument values logging to a file. See Logging instrument values for details.

After choosing this menu option, following dialog appears:

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Target folder: Type or choose directory where signals should be stored. The directory should already exist.

File name prefix: To make file names recognizable, you can define prefix string which will be added to the beginning of each created file name.

Create new file when file size of …MB has been reached: You can limit the size of single files. After reaching length you defined here, SIGVIEW will create new file and continue storing data in it. If you set maximal file size to 0, SIGVIEW will create new file for each new block from the origin window.

Wait for manual “Start” command: If you turn this option on, log window will not start storing data after it has been created, but will rather wait on your command. You can manually start and stop logging process by using context menu (right mouse button) options on the logging window.

After you set all properties for signal logging and press OK button on this dialog, log window will appear:

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It shows all information about the logging process including current file, amount of stored data, number of files and average data rate.

Signal files will be created in target folder and named <prefix>_<YYYYMMDD>_<HHMMSS>.SIG.
To make data storage fast enough, data is stored in a 32-bit binary float format without any header information. File extension will always be “*.SIG”. All additional data like sampling rate or start time is stored in a TXT file having the same name as stored SIG file.

To load SIG files in SIGVIEW, use File/Open data log file main menu option. This function will load SIG file and automatically read its additional information from TXT file. You can store your signal in WAV or any other supported format afterwards.
Logging data to file