SPX SPIDAR NIC-500s Operation Manual page 52

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Free-run interval – the time between GPR traces.
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Start delay (s) - the user can set an initial time delay in seconds, to allow time to get
setup and start the survey line. If there are multiple NIC-500s, the Start Delay must be
the same for all NIC-500s.
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Step size – set individually per NIC-500, the free-run interval and speed together will be
used to maintain the desired step size, as per the following equation:
Figure 4-26: Trigger set to Free Run (single NIC-500)
Figure 4-27: Trigger set to Free Run (multiple NIC-500)
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SPIDAR Software