ETS-Lindgren HI-3603 VLF Survey Meter User Manual
Page 29
HI-3603 VDT/VLF Survey Meter
© ETS-Lindgren, August, 2005
Revision E, Part #H-600042
29
Figure 8: Magnetic field emissions from the VDT are
unperturbed by the presence of the operator.
Because of the perturbing effect of the operator's body on the
electric field close to the VDT, it is apparent that the evaluation of
electric field emissions will be very dependent on proximity of the
operator and/or other nearby objects.
In Figure 8 it is seen that the magnetic field lines emerging from
the VDT are not perturbed in their orientation with respect to the
operator's body; this happens because the body is non-magnetic
in nature. Thus, in measuring the magnetic field in front of a
VDT, usually the maximum value is associated with vertically
polarized lines of flux and with the HI-3603 circular probe
oriented horizontally such that a maximum number of these
magnetic field line pass through the aperture of the loop.