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EM-ambient site survey of industrial environments

By Darrell Price,2014-03-26 20:11
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The origin of this proposal is forthcoming from the European 5th Framework research project TEMCA2, dealing with the EMC characterisation and validation of

    COST 286 Joint Technical Actions (JTA)

    EM-ambient site survey of industrial environments

1. Introduction

    The origin of this proposal is forthcoming from the European 5th Framework research project TEMCA2, dealing with the EMC characterisation and validation of large machines and installations in-situ. The lack of data about the EM ambient in industrial environments has been noticed within this project.

    1.1. There are nearly no data available on the EM ambient in industrial environments. This is

    the case for both conducted and radiated ambient levels.

1.2. Some data should be available in an older ITU document.

    1.3. Standards EN 61000-2-x provides guidance for the characterisation of EM ambient

    levels under different circumstances.

    The knowledge of the ambient noise is of particular interest in planning and setting up wireless datacommunications in industrial applications.

2. Domains to be considered

    The following frequency domains are of interest for the members of COST286 and the purpose of this Joint Technical Action:

    - frequency range from 1.6 30 MHz, of interest for PLC/PLT. See also JTA2

    - normal EMC frequency range, from 30 1000 MHz

    - frequency range for short distance communication systems, in the 2.4 2.5 GHz band

3. Procedure

    Depending on the frequency range, another measuring antenna should be used. Typically for the PLC/PLT range, a loop antenna will be used, measuring the H-field level. For the other frequency ranges, typically biconical, logperiodic, bilog (and perhaps horns) will be used.

    - Noise floor of the measuring setup, in order to determine the valuable levels of signals.

    If possible, 10 KHz or 120 KHz measuring bandwidth should be used. If the noise

    level is still too high, a smaller measuring bandwidth will be used and specified.

- A “one-shot” measurement will be done over the full spectrum of 1.6 – 30 MHz, 30

    1000 MHz or 2.4-2.5 MHz.

    - A set of measurements will be performed, using a peak-hold setting of the measuring

    equipment, over a number of times of each 5 minutes duration. Exact time will be

    recorded over the day/night.

     thVersion JTA3, January 24, 2005

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