ETS-Lindgren HI-3603 VLF Survey Meter User Manual

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HI-3603 VDT/VLF Survey Meter

process in conjunction with the HI-3616 Fiber Optic Remote
Control. The HI-3616 is supplied with a length of non-conductive
fiber optic cable suitable for connecting the output of the HI-3603
to the receiver unit.

It is difficult to relate the many different exposure phenomena
that can occur with VDT operators. For example, while the
presence of the operator usually increases local surface electric
fields, with some operators the local field strength may actually
be decreased in the chest area. This can be due to inherent
shielding provided by the head or hands that may be closer to
the VDT resulting in higher localized exposure to those parts of
the body.

Operator exposure to magnetic fields should be assessed by
having the operator move slightly back, away from the VDT, and
placing the sensing paddle of the HI-3603 with its center at the
location of where the operator's body was.

Figure 11: Operator self-measurement of VDT electric field

exposure using the optional HI-3616 Fiber Optic Remote

Control.