ETS-Lindgren HI-3604, Руководство пользователя

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1.0 Introduction
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 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 selectable sensors for measuring both electric
and magnetic fields. The instruments' capabilities include data-logging,
waveform output, full auto-ranging, and a custom Liquid Crystal
Display (LCD) with a bar graph. All selection and control functions are
input from a front panel membrane switch pad. True RMS (root-mean-
square) detection assures accurate measurements of complex
waveforms. The waveform output jack allows observation and
evaluation of the actual waveform being measured. The data-logger
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, related to the external electric field strength. This type of
transducer possesses a flat frequency response and permits accurate
measurement of fields having significant harmonic content with energy
at frequencies above the fundamental of 50 or 60 Hz.