User's Manual
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3. Num Samples Select the number of samples for each A-scan. A value of 512 samples
will work for most situations. Note that using a large number of samples (1024 or more)
may limit the Trace Sample Rate
. Use 512 samples for the RABIT.
4. Channel A/B Holdoff The GPR digitizer has two channels: A and B. The holdoff time
can be adjusted independently for each channel. The B channel can only be adjusted in
4 ns increments relative to the A channel. Normally, users will not need to change these
values.
7.2.3 Previous and Next Line Buttons
Multiple survey lines are not used when making RABIT surveys, so the Next line
or
Previous line buttons are not used. After pressing one of these buttons, the system
runs through a line initialization sequence which tasks a few seconds. When the user hears an
audible beep from the tablet, the initialization sequence has completed (and therefore, users
should wait until the audible beep is heard before another line request).
7.3 Log File
The acquisition program writes a log file with all of the contents of the status panel. This
file is overwritten each time the program runs. It can be useful to refer to this file to help
diagnose problems. It is located in the user’s home directory on this path:
\.Earth_Science_Systems\EssGpr4LoggingApp\scripts\EssGpr4LoggingApp.log.
7.4 Emissions
7.4.1 Health and Safety
ESS GPR systems emit electromagnetic radiation from the radar sensor, the WiFi
adapter, and the Bluetooth adapter (if present). The electromagnetic radiation from ESS GPR
radar sensors is many times less than that from cellular telephones. ESS GPR systems can be
operated anywhere cellular telephones are permitted. The health and safety hazards posed by
ESS GPR systems are less than those posed by cellular telephones.
Figure A2. Digitizer settings dialog.