Atec Narda-EHP-50D - Manual (Page 3)

EHP-50D 04-11 3 / 12 Subject to change without notice
EHP-50D
Electric and Magnetic Isotropic Field Analyzer
The EHP-50D is not simply an upgrade of the EHP-50C, but
represents a real leap in technology made possible by the
availability of even more sophisticated components that can
provide high level performance while keeping the physical
dimensions and intrinsic noise level small.
The EHP-50D gives users the choice of three measurement
modes: Wideband, which measures the contribution of all the
frequency components in the selected frequency span; Highest,
which measures only the highest level found within the span; and
Spectrum, which includes marker functions. The spectrum analysis
feature means that the EHP-50D can be used to measure only the
field contribution from the selected source, such as a high voltage
line, excluding other nearby interfering frequencies. Everything is
contained in the small (approx. 1 dm
3 ), cubic EHP-50D housing:
three magnetic coils and three plate capacitors orthogonally
positioned for sensing the fields; a multi-channel analog to digital
converter followed by a powerful DSP (digital signal processor) for
analyzing the signal; the CPU module that controls all the functions;
an E
2 PROM that stores the calibration data and the frequency and
level calibration tables; an optical interface to allow easy connection
to external displays via optical fiber link; a high capacity data logger
for stand alone continuous acquisition; and the control panel with
the connections and the ON/OFF switch.
Application focus: simultaneous three-axis measurement
The EHP product family is a unique solution providing both E and
H field measurement, including spectrum analysis, in a single,
small size casing. Thanks to its multi-channel A/D converter, the
EHP-50D additionally provides simultaneous three-axis
acquisition for unsurpassed performance even in the most
complex applications. Specialists in the low frequency field who
were mainly performing measurements to assess the exposure of
the public to the relatively steady fields emitted by power lines
are now facing new challenges to provide answers regarding field
exposure in the workplace. According to various standards and
regulations as well as to the European directive, which will be
effective from April 2012, work environments must be assessed
in order to ensure that the maximum permitted field levels
recommended in the ICNIRP guidelines are never exceeded. The
industrial environment not only encompasses devices generating
relatively steady fields, but also includes welding machines and
other devices generating very complex or pulsed fields.
Simultaneous three-axis measurement is therefore mandatory for
these applications, which consulting companies, industrial health
and safety departments, and workplace health and safety
agencies will be asked to perform more and more in future.