ON STAGE III IIIP (serv.man7) - JBL Audio EMC - CB Certificate (repair manual). Page 19

4.2.2.  In Anechoic Chamber Test Setup Diagram 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 

4.3. Test  Standard 

EN55022: 1998+A1:2000+A2: 2003 

4.4. Radiated Emission Limit 

All emanations from a Class B computing devices or system, including any network of 
conductors and apparatus connected thereto, shall not exceed the level of field strengths 
specified below: 

FREQUENCY 

(MHz) 

DISTANCE 

(Meters) 

FIELD STRENGTHS LIMITS 

(dB

μV/m) 

30 ~ 230 

10 

30 

230 ~ 1000 

10 

37 

Note: 

(1)  Emission level = Antenna Factor + Cable Loss + Reading 

  (2)  The lower limit shall apply at the transition frequencies. 

 

(3)  Distance refers to the distance in meters between the test antenna and the       

closed point of any part of the EUT. 

4.5. EUT Configuration on Test 

The EN55022 Class B regulations test method must be used to find the maximum 
emission during Radiated Emission test.   

The configuration of EUT is same as used in Conducted Emission test. Please refer to 
Section 3.5. 

4.6. Operating Condition of EUT 

4.6.1.  Setup the EUT and the simulators as shown on Section 4.2. 

4.6.2.  Turn on the power of all equipments. 

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

ANTENNA TOWER

ANTENNA ELEVATION VARIES FROM 1 TO 4 METERS 

GROUND PLANE

10 METERS 

TURN TABLE 

0.8 METER

EUT and   
Support System