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Audix Technology (Wujiang) Co., Ltd. EMC Dept. Report No.: ACWE-F2101012
AUDIX GROUP
6.4. Measurement Procedure
The radiated emission measurement was performed in accordance with the procedure
of the ANSI C63.4-2014 clause 8.3.
The EUT and peripherals were placed on the rotatable non-conduction table, which is
0.8meters above the ground reference plane at the semi-anechoic chamber or OATS
as described in section 4.1 and 6.2.
The measurement distance is set as specified in section 6.3. The specified distance is
between the horizontal projection onto the ground plane of the closest periphery of the
EUT and the projection onto the ground plane of the center of the axis of the elements
of the receiving antenna.
The resolution bandwidth of the test receiver was at 120kHz (testing from 30 to
1000MHz) or 1MHz (testing above 1000MHz).
Operate the EUT system as described in section 4.2.
For the exploratory measurement, determine the highest emission amplitude relative
to the limit on each of antenna polarization with the peak detector by each of the EUT
operations over the specified frequency range and record it.
For final measurement, select the EUT operation mode that produced the highest am-
plitude in the exploratory measurement to determine the highest emissions with each
specified detector and record it.
In order to determine the maximum emission level, must rotate the table in 360 degree
and move the receiving antenna between 1~4m height above the ground reference
plane.
In order to find the maximum emission, all of the interconnecting cables were manipu-
lated, except for the bundled cable.
Both polarizations of receiving antenna were determined.
The measurement result was calculated by following formulas:
(30 – 1000MHz)
Emission Level = Reading (Receiver) + Cable Loss + Antenna Factor
-Preamp factor(dB)
(Above 1GHz)
Emission Level = Reading (Spectrum) + Cable Loss + Antenna Factor
- Preamp factor(dB)
The 3dB bandwidth of the horn antenna is minimum 22 degree (or w=1.17m at 3m
distance) for 1~18 GHz.
The 3dB bandwidth of the horn antenna is minimum 14 degree (or w=0.73m at 3m
distance) for 18~40 GHz.