ETS-Lindgren HI-3604 ELF Survey Meter - Manual (Page 9)

HI-3604 Manual Page -- 1
1.0 DESCRIPTION
The HI-3604 Power Frequency Field Strength Measurement
System is designed to assist in the evaluation of electric and
magnetic fields that are associated with 50/60-Hz electric
power transmission and distribution lines along with electrically
operated equipment and appliances. Direct digital readout of
field strength is provided by the instrument with the ability to
read the meter remotely via a special fiber optic remote control
(Model HI-3616) which is available as an option. The HI-3604
finds applications in research and environmental field studies
where knowledge of the strength of power frequency fields is
required. It is designed to provide engineers, industrial hygienists
and health and safety personnel with a sophisticated tool for the
accurate investigation of power frequency electrical
environments.
The HI-3604 has two switch selectable sensors for measuring
both electric and magnetic fields (see Figure 1-1). The
instruments' capabilities include datalogging, waveform output,
full auto-ranging, and a custom Liquid Crystal Display (LCD)
with a bar graph, as standard features. All selection and control
functions are input from a front panel membrane switch pad.
True RMS detection assures accurate measurements of complex
waveforms. The waveform output jack allows observation and
evaluation of the actual waveform being measured. The
datalogger feature captures up to 112 field readings for later
review using front panel controls. Microprocessor technology is
incorporated in the HI-3604 to provide for automatic range
changing (manual range changing may be selected) and
automatic zeroing of the instrument.
Electric fields are detected by a displacement current sensor
which consists of two thinly separated conductive disks which
are connected together electrically. When immersed in an
electric field, charge is redistributed among the two parallel
disks such that the electric field between the two disks remains
at zero. This redistribution of charge is reflected as a
displacement current which can be measured and subsequently,