ETS-Lindgren HI-3604 ELF Survey Meter - Manual (Page 31)

HI-3604 Manual Page -- 23
5.0 EXAMPLE APPLICATIONS
Caution - Use care when using this instrument near energized
conductors. Be sure to read the hazard warning located on the
Warranty page.
Field Strength Measurements
Measurement of electric field strength, under a power line or
near any other source of electric fields, may be accomplished by
supporting the HI-3604 on a non-conductive tripod (Part Number
491009), such as that shown in figure 5-1. Be sure to orient
the top surface of the sensor paddle towards the field source.
It is critical that the user not hold the instrument since this will
significantly alter the response of the HI-3604 providing an
apparently enlarged field collecting surface for the displacement
current sensor, resulting in an erroneously high indicated field
strength. In addition, the presence of the operator's body will
tend to perturb the electric field that is being measured. The
operator should remain approximately one to two times their
height away from the HI-3604 and observe the readings via the
use of the HI-3616 Fiber Optic Remote Control. The instrument
is supported with the digital readout facing upward; in this
position, the electric field lines which are directed downward
toward the earth will strike the correct side of the displacement
current sensor resulting in an accurate measurement of the field
strength. Because of the physical asymmetry in the
displacement current sensor it is imperative that the front side
of the sensor be directed toward the electric field source.