SDR Version 4.1 Documentation

Introduction:

The Seismic Data Recorder (SDR) program collects data from up to 8 channels at 100, 50, 25, 10 or 5 samples per second (SPS) or up to 4 channels at 200 SPS. All data is saved to disk so you can replay the data (see the Replay command) and produce PSN format files that WinQuake can view. The data is stored in a file for each channel with the file extension of CHANx.jjj where x = 1 to 4 and jjj = Julian day or 001 to 365. Each day, starting at midnight UTC time, a new record file will be created. Old record files will be purged from your system depending on a setting under the F6 settings. You must make sure you have enough disk space available for the number of channels you have, and, the number of days of data you want to save. Each channel will produce about 6 megabytes per day at 50 SPS or ~12 megs at 100 SPS.

SDR will also automatically save PSN format files if one or more channels go past a pre-determined Alarm Point or STA/LTA (Short Term Averaging / Long Term Averaging) threshold point set for each channel (ALT-1 to ALT-8 keys). When an alarm is triggered SDR will wait about 3 minute after the alarm stops and then create a event file starting about 2 minutes before the trigger time, and ending about 3 minutes after the alarm stops. If you are going to be recording teleseismic events you will need to wait for all of the phases or waves to come in. This can take up to 1 hour or more depending on the size of the event. To produce one event file for the event you would then Replay the data (R key) and go to the start of the event. You then Save (S key) the event to a PSN format file. This release of SDR saves event file data in the new PSN Type 4 format.