ON STAGE III IIIP (serv.man6) - JBL Audio EMC - CB Certificate (repair manual). Page 12

 

3.5. EUT Configuration on Test 

The following equipments are installed on conducted emission test to meet EN55022 
requirement and operating in a manner which tends to maximize its emission 
characteristics in a normal application. 

3.5.1.  Computer Speaker System (EUT) 

Model Number 

： 

jbl on stage lll 

Serial Number 

： N/A 

Manufacturer(1) 

： 

Zhao Yang Elec. (Shenzhen) Co., Ltd 

Manufacturer(2) 

： 

Jie Hao Elec. (Su Zhou) Co., Ltd 

3.5.2.Support Equipment  ：        As Tested Supporting System Detail, in Section 2.2. 

3.6. Operating Condition of EUT 

3.6.1.Setup the EUT and simulator as shown as Section 3.2. 

3.6.2.Turn on the power of all equipment. 

3.6.3.Let the EUT work in test mode (Data Transmitting) and measure it. 

3.7. Test  Procedure 

The EUT was placed on a non-metallic table, 80cm above the ground plane. The EUT 

Via PC Power connected to the power mains through a line impedance stabilization 
network (L.I.S.N. 1#). The other peripheral devices power cord connected to the power 
mains through a line impedance stabilization network (L.I.S.N.#3). This provided a 
50-ohm coupling impedance for the EUT (Please refer to the block diagram of the test 
setup and photographs). Both sides of power line were checked for maximum conducted 
interference. In order to find the maximum emission, the relative positions of equipments 
and all of the interface cables were changed according to EN 55022 Class B on conducted 
Disturbance test. 
 

The bandwidth of the test receiver (R&S Test Receiver ESHS10) is set at 10kHz. 

 

The frequency range from 150 kHz to 30 MHz is investigated. The test data and the 

scanning waveform are listed in Section 3.8.