User's Manual

Draft www.malags.com
12
The bottom part of the screen shows some information about
the ongoing survey. It’s self-explanatory except for the trigger-
type field. The trigger type field explains what controls the data
acquisition, there’s three different types of control; forward
wheel, backward wheel and time triggering. Time triggering
means that the unit collects data with certain frequency,
normally 10 to 20 Hz; it is to be used when surface conditions
prohibit the use of a wheel.