AV1 (serv.man2) - JBL Audio EMC - CB Certificate (repair manual). Page 10

Report #70112.e1 

 
 

 

 

The purpose of this test is to measure the radiated electromagnetic emissions generated by the 
equipment under test (EUT), pursuant to FCC part 15 and EN55022 Class B requirements. (See 
Table 3.1.1-1 for the Class B radiated limits.) 
 

Testing is performed in an Open Area Test Site. The EUT is placed on a wooden turntable 80 cm 
in height. The EUT is centered laterally on the turntable and flush with the rear of the table. 
Peripheral equipment is placed on either side of the EUT with a minimum of 10 cm spacing. 
(When testing a personal computer system, monitors shall be placed on top of the PC, and the 
keyboard and mouse shall be placed in front of the PC towards the front edge of the turntable.) 
Excess interface cables are draped over the back edge of the table no closer than 40 cm to the 
ground plane. 

 

The EUT shall be set into operation such that all parts of the system are exercised. This may 
require the use of test software designed to exercise the various parts of the system. With the EUT 
set into operation, the turntable is rotated over 360 degrees and interface cables are manipulated 
to maximize the emissions. The peripherals are not moved during the test. The receiving antenna 
is placed at a test distance of 3 or 10 meters from the closest point on the EUT. The antenna 
height is varied from 1 to 4 meters, and the polarity of the antenna is switched between vertical 
and horizontal such that the received signal is maximized. 
 

 

None 
 

A minimum of a 2 dB margin of compliance is recommended for radiated emissions data to verify 
passing results. This is recommended to compensate for the measurement uncertainties involved.