Geometrics, Inc. G-824A Magnetometer Manual
43
make a reoccupation of the spot easier (e.g. for base-station recordings used for block-
leveling regional survey data).
We recommend a base-station installation that places the sensor approximately 5ft (1.5m)
above the ground in order to reduce motion-induced noise. Motion noise will be
proportional to both the amount of sensor motion and the size of the local gradient.
Positioning the sensor off the ground will reduce the gradients arising for the soil or from
outcrops. It is also important to provide a rigid support structure to keep wind induced
motion to a minimum. Figure 7 shows a base station installation that uses a kit supplied
by Geometrics for this purpose.
G-824B
magnetometer
installed using
sensor staff
sections as mast.
Webbing guys re
used to stabilize
the mast. This
installation
provides a rigid,
non-ferrous
support for the
sensor that
presents minimal
wind resistance.
Base Station Tripod
