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Magnetic and electric-field analyzers measure accurately regardless of signal type. (Product & Services).

Narda Safety Test Solutions has introduced new isotropic analyzers for low-frequency magnetic and electrical fields. The analyzers, which produce fast, accurate measurements regardless of signal shape and complexity, can help ensure the safety of utility workers and private citizens in proximity to power lines or high-voltage equipment.

The new Model EFA-200 and Model EFA-300 field analyzers, designed for use in industry, by insurers, and by health and safety professionals, employ an innovative shaped-time-domain (STD) technology. The complex STD circuitry calculates and displays field strength levels as a percentage of an industry or government standard, irrespective of signal frequency and wave form, allowing for an immediate determination of safety or potential for harm.

"The energy emitted by high-voltage utility lines and industrial equipment such as resistance welders can pose risks to personal safety," said Richard Strickland, director of business development for Narda STS. "Until now, there haven't been instruments that could perform the level of analysis needed to confirm, quickly and conclusively that a given environment complies with established standards for occupational or public safety".

The EFA-200 and the EFA-300 both measure magnetic field strength. The EFA-300 includes a cube-shaped module for isotropic measurement of electrical field (E-field) strength. Its E-field module can be operated remotely from the base unit, so that field strength can be measured with little or no influence of a human body on the field being measured.

Both models are designed to operate in a low-frequency range of 5 hertz to 32 kilohertz. If multiple-frequency signals are present, the analyzers can be optionally equipped to perform fast Fourier transform (FFT) spectral analysis, in which all components, including harmonics, are evaluated simultaneously.

The EFA-200 and the EFA-300 have built-in isotropic magnetic field probes, and both models also can be used with a large, optional, high-sensitivity probe for enhanced performance and measurement of dissimilar magnetic fields. B-field analysis can be performed in hard-to-reach places with another optional probe, a miniature, 3-centimeter "sniffer" probe.

Depending on the application, the analyzers can be set to operate in broadband mode, covering the entire spectrum from 5 Hz to 32 kHz. For a more detailed field analysis, or in environments with multi-frequency fields, band pass and band reject filters are available in the range of 15 Hz to 2 kHz. User-editable filter lists can also be configured. For convenience, the analyzers are designed to allow fast switching between common filter settings such as broadband and band pass. The backlit LCD display provides graphed and numeric indication of field strength and visual confirmation of operational mode, bandwidth, and other parameters.

Windows-based software allowing remote operation and the down-loading and analysis of data stored in the analyzer also is available.

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Publication:Journal of Environmental Health
Geographic Code:1USA
Date:Dec 1, 2002
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