For most analysis functions in SIGVIEW, using relative signal time (signal begin = 0.0s) would be sufficient. But, it is often important to see actual signal time (wall-time) as well in order to relate signal artefacts to some other events with known time. Therefore, SIGVIEW can also handle wall-time of a signal and display it if it is known. The following aspects of handling wall-time are important:

Data acquisition


For all signals acquired and recorded with SIGVIEW, actual local data acquisition time is assigned as a wall-time to a signal. The precision of this time depends on many external parameters like sampling rate precision of a DAQ-device. Signal time is not retrieved from the DAQ device but generated based on the PC-clock and reported nominal sampling rate of a signal.

Loading/saving


SIGVIEW can save signal time in a custom-chunk of a standard WAV files and load it from such files again. See File Formats for details.  Also, there is an option to use WAV file creation data/time as a signal start time if no other information about signal time is available. See Application Settings for details.

Display


If signal time information is available, it will be displayed in a status bar (from-to range for a visible signal part, date in DD.MM.YY format):



and in a tooltip next to the signal ruler (with or without selection):


 

Manual time definition


Signal time can be changed or set manually by using main menu option Edit/Edit signal time...


In the following dialog, begin time of a signal can be changed or set. Additionally to setting date and time in seconds, a high-precision timestamp can be defined by adding a fraction of a second.




Local/UTC time


SIGVIEW does not convert times based on local settings.