1.816.353.2100 www.rycominstruments.com
A potential problem if a fault beneath a paved surface. In this case, the Ground Return Probe
or STAFF will be used in the dirt at the side of the paved area. Since the return current in the soil
begins its return from the fault - like the spokes of a wheel laying on the ground - equal amounts
of current will enter the GRP if it is placed on the ground and positioned broadside to the fault. At
the point where the directional indication changes the fault will lie on a straight line projected at
a right angle from the center of the GRP. The GRP adjustments can be made by slightly rotating
the Ground Return Probe to find the directional change. The operator should record this line
over the paved area. By repeating this procedure from another location near the paved area,
another line will be produced. The intersection of the two lines is the location of the fault.
CABLE
PAVED ROAD
GROUND RETURN PROBE IS
POSITIONED FOR A MINIMUM
(NULL) RECEIVER DISPLAY.
GROUND RETURN PROBE IS
POSITIONED FOR A MINIMUM
(NULL) RECEIVER DISPLAY.
SHEATH-TO-GROUND
FAULT
f
aults
b
eneath
p
aved
s
urfaCes
