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1 Introduction
1.1 About these instruments
1.1.1 Applications
Many people live and work in the vicinity of power lines and power
distribution equipment. For safety’s sake, it must be ensured that these
people are not exposed to any electromagnetic fields that could be injurious
to health.
Global efforts to introduce effective protection in recent years have led to a
range of national and international guidelines and standards. These set
permitted limit values for electric and magnetic field strengths for various
frequency ranges and signal shapes.
In practice, this means using simple equipment to measure the fields that
occur at a particular location or place of work with sufficient accuracy to
check the effectiveness of protective measures, ensure that the limit values
stipulated by the standards and guidelines are not exceeded and to dispel
any doubts in the minds of those affected. Lightweight, portable, battery-
operated measuring instruments, which cover the dynamic range and
frequencies of interest are needed for this. They must also be easy to use
and deliver results that can be directly compared with the current limit
values.
1.1.2 Common features
The EFA-200 and EFA-300 Field Analyzers are devices for monitoring low-
frequency fields in the range 5 Hz to 32 kHz.
All instrument functions are designed for ease of use under practical
conditions. Operation has been arranged so that the instruments can be set
as simply as possible using function keys and menu keys. Menu keys are
used to switch between the four main menus: MODE, CONFIGURATION,
MEMORY and USER.
The MODE key thus gives access to up to 5 different operating modes.
These modes can be activated individually at any time as needed, so you
can always adapt your EFA to the specific task at hand.
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