NS ORD-1996-033 Zoning Ordinance Text Amendments - Telecommunication Towers

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DENNY & ASSOCIATES, P.C. CONSULTING ENGINEERS 48 WASHINGTON, DC Engineering Statement Page 5 ENKA29-1,-Carrboro, North Carolina MEASUREMENT PROCEDURE Electromagnetic field strength measurements were made using a Narda, model 8718,serial number 01155,radio-frequency electromagnetic field strength survey meter. The model 8722B,serial number 13012, broadband electric field probe was used for all electric field measurements. The frequency response of the mode18722B probe is shaped to conform to the 1992 ANSI/IEEE exposure standard. Configured with this conformal probe,the survey meter indicates exposure level as a percent of the MPE for controlled environments. Configured with the model 8722B conformal electric field probe, the survey meter exhibits a sensitivity threshold of 0.15 percent of the MPE for controlled environments. Because of the frequencies in use at the site and the distances from the radiation sources being measured, the electric field component of radiation alone was sufficient to define exposure, and a full course of magnetic field measurements was deemed unnecessary. However,a model 8731, serial number 02030, isotropic probe was used for spot magnetic field measurements. The electromagnetic monitor was calibrated in August 1995. Measurement data were recorded by the electromagnetic monitor for later analysis. The monitor was programmed to sample the measured exposure level once each second. Data were logged for 30-second sample periods and, at the end of each sample period;the average exposure encountered over the course of the sample period would have been calculated had the exposure levels been above the sensitivity threshold of the instrument. Then, the calculated average and measured minimum and maximum power density levels for each sample period would have been stored in the