Safety Information

Page 25 of 33 Report No.:FCS202103006W01
Flux Compliance Service Laboratory
Room 105 Floor Bao hao Technology Building 1 NO.15 Gong ye West Road Hi-Tech Industrial, Song shan lake Dongguan
Tel: [phone] Fax:[phone] http://www.fcs-lab.com
5. BAND EDGE TEST
5.1 LIMIT
According to §15.249(d), Emissions radiated outside of the specified frequency bands, except
for harmonics, shall be attenuated by at least 50 dB below the level of the fundamental or to
the general radiated emission limits in §15.209, whichever is the lesser attenuation.
5.2 TEST PROCEDURE
a.
The EUT is placed on a turntable, which is 1.5m above ground plane.
b.
EUT is set 3m away from the receiving antenna, which is varied from 1m to 4m to find out
the highest emissions.
c.
Use the following spectrum analyzer settings:
Span = wide enough to fully capture the emission being measured, RBW = 1 MHz, VBW ≥
RBW, Sweep = auto, Detector function = peak, Trace = max hold
d.
Follow the guidelines in ANSI C63.4 with respect to maximizing the emission by
rotating the EUT, adjusting the measurement antenna height and polarization, etc.
The peak reading of the emission, after being corrected by the antenna factor, cable loss,
pre-amp gain, etc., is the peak field strength, submit this data. Each emission was to be
maximized by changing the polarization of receiving antenna both horizontal and vertical.
e.
Set the VBW to 10 Hz, while maintaining all of the other instrument settings. This peak
level, once corrected, must comply with the limit specified in Section 15.209. If the duty
cycle per channel of the hopping signal is less than 100 ms, then the reading obtained with
the 10 Hz VBW may be further adjusted by a “duty cycle correction factor”, derived from
20log(duty cycle/100 ms), in an effort to demonstrate compliance with the 15.209 limit.
Submit this data.
Note:
For fundamental frequency ,RBW>20dB BW ,VBW>RBW,PK detector for PK value, RMS
detector for AV value.