SPX SPIDAR NIC-500s Operation Manual page 50

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Odometer Calibration – this is the numerical value for the calibrated odometer, unique to
each site and conditions. This can be directly input if it's known. When an odometer is
calibrated, this value is automatically updated.
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Step Size – used to specify the distance the GPR will move before collecting a new
trace. It is important to set the correct step size to resolve subsurface targets. A step
size that is too coarse may result in missed subsurface targets. A step size that is too
fine may result in large data volumes, skipped traces and slow survey productivity.
If there are multiple NIC-500s connected, the step size can be set for each NIC-500
(Figure 4-23). Otherwise, the same step size must be used for all GPR
transducers/antennas connected to that NIC-500. For a multi-frequency application, you
will want to use the recommend step size for the highest frequency system.
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Calibrate Odometer – pressing this button, will navigate the user to a page where the
odometer is calibrated by moving the system a known distance (Figure 4-24). Press
Start and then move the system that exact distance, using a measuring tape or other
known distance indicator (Figure 4-25). Upon completion, either accept the new value or
revert back to the old one.
Figure 4-24: Select distance to calibrate odometer
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SPIDAR Software