Field Scout SC 900, Product Manual

Page: 5 / 28

5
An ultrasonic sensor
located at the base of
the meter is used to
measure the depth of
penetration. The field
of view extends about
30
o
from the shaft. The
sensor measures dis-
tance by emitting a
sound wave and meas-
uring the travel time of
the first reflected wave.
Usually, this first reflec-
tion will come from the
ground just adjacent to
the shaft. However, if
an object with a surface
oriented toward the sen-
sor is within the field of
view, an erroneous
depth measurement may
be made. This can lead
to depth error messages (see
Diagnostic Messages p. 18).
If possible, try to remove the object and/or smooth the sur-
face. Repositioning your feet and knees may also elimi-
nate these errors. If the problem persists, use the depth
target included with the meter to test the depth sensor and,
if necessary, to take measurements. If the depth target is
not available, one can be made out of cardboard or some-
thing sturdier if more durability is required. To test the
depth sensor, lay the target on the ground and place the
shaft in the hole. Have another person slowly raise the
depth target while you verify the meter is incrementing the
depth.
Depth Sensor
Depth
Sensor