Description Of Radiated Emissions Test - Foxconn NVLAP FCC DoC Test Manual

PEP Testing
12-3Fl, No. 27-1, Lane 169, Kang-Ning St., Hsi-Chih,
Taipei Hsien, Taiwan, R. O. C.
TEL: 886-2-26922097
REPORT NO. :E930560

8. Description of Radiated Emissions Test

8.1 Radiated Emissions
Preliminary measurements were made indoors chamber at 3 meter using broadband
antennas, broadband amplifier, and spectrum analyzer to determine the frequency
producing the maximum EME. Appropriate precaution was taken to ensure that all EME
from the EUT were maximized and investigated. The system configuration, clock speed,
mode of operation or video resolution, turntable azimuth with respect to the antenna were
noted for each frequency found. The spectrum was scanned from 30 to 1000 MHz using
logbicon antenna. Above 1GHz, linearly polarized double ridge horn antenna was used.
Final measurements were made outdoors at 10-meter test range using logbicon antenna
and horn antenna. The test equipment was placed on a wooden bench situated on a 1.5x1
meter area adjacent to the measurement area. Sufficient time for the EUT, support
equipment, and test equipment was allowed in order for them to warm up to their normal
operating condition. Each frequency found during pre-scan measurements was
re-examined and investigated using Quasi-Peak Adapter. The detector function was set to
CISPR quasi-peak mode and the bandwidth of the receiver was set to 120kHz.
The turntable containing the system was rotated; the antenna height was varied 1 to 4
meters and stopped at the azimuth or height producing the maximum emission. Each
emission was maximized by: varying mode of operation or resolution; clock or data
exchange speed; scrolling H pattern to the EUT and/or support equipment, and powering
the monitor from the floor mounted outlet box and the computer aux AC outlet , if
applicable; and changing the polarity of the antenna, whichever determined the worst-case
emission. Photographs of the worst-case emission can be seen in radiated emission test
photo.
Laboratory
FAX: 886-2-26956236
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NVLAP LAB CODE: 200097-0
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