ETS-Lindgren HI-3604 ELF Survey Meter - Manual (Page 33)

HI-3604 Manual Page -- 25
directly on the ground, with the sensor disk facing upward. In
this orientation, the vertically polarized electric field component
is measured. When performing measurements with the
instrument on the ground, care must be exercised to insure that
vegetation, such as tall weeds, does not interfere with the field
strength measurement due to the shielding phenomenon
discussed above. In either case, with the instrument elevated on
a tripod or laying on the ground, the HI-3604 should be oriented
so that the long axis of the body of the instrument is parallel to
the conductors of the power line. This orientation is necessary
to reduce any instrument response to any horizontal component
of the electric field caused by the asymmetric physical shape of
the HI-3604. Figure 5-2 illustrates the correct orientation of the
instrument relative to the power line conductors.
Orientation of HI-3604 for Measurement of Vertical
Electric Field Strength Beneath a Power Line
Figure 5-2
Illustration of correct and incorrect orientation of the HI-
3604 for measurements of electric field strength beneath
an overhead power line.
Magnetic field strength is measured by typically orienting the
sensor paddle perpendicular to the field lines. (The orientation
arrows at the top of the sensor paddle surface are intended to