ON STAGE III IIIP (serv.man7) - JBL Audio EMC - CB Certificate (repair manual). Page 20

 

4.7. Test  Procedure 

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

 

semi-anechoic chamber. An antenna was located 10m from the EUT on an adjustable 
mast. A pre-scan was first performed in order to find prominent radiated emissions. For 
final emissions measurements at each frequency of interest, the EUT were rotated and the 
antenna height was varied between 1m and 4m in order to maximize the emission. 
Measurements in both horizontal and vertical polarities were made and the data was 
recorded. 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 Radiated 
Disturbance test. 
 
The bandwidth setting on the test receiver (R&S TEST RECEIVER ESVS10) is 120 kHz. 
 
All the test results and all the scanning waveform are listed in Section 4.8. 

4.8. Radiated Disturbance Test Results 

PASS. (All emissions not reported below are too low against the prescribed limits.) 
 

The EUT with the following test modes was tested and all the test results are listed in next 
pages. 

 

EUT: Computer Speaker System        Model No. : jbl on stage lll 
 
Test Date: Jul.23, 2007    Temperature: 24℃    Humidity: 56% 

The details of test models are as follows： 

Reference Test Data 

No. 

No. Test 

Mode 

Power Adaptor 

Horizontal 

Vertical

1. 

DSA-20R-12 FEU 120180 

#14 

#13 

2. 

Data Transmitting

KSAD1200150W1EU #11 #12