ON TOUR XTB (serv.man5) - JBL Audio EMC - CB Certificate (repair manual). Page 18

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EN 55022 also specifies limits and methodology for radiated emissions testing. Initially, the primary emission 
frequencies are identified inside a shielded chamber by positioning a broadband receive antenna one meter from 
the EUT. Next, the EUT and associated system are placed on a turntable on a ten-meter open area test site 
(OATS) with known attenuation characteristics and all significant radiated emissions are recorded. To ensure 
that the maximum emission at each discrete frequency of interest is observed, the receive antenna is varied in 
height from one to four meters and rotated to produce horizontal and vertical polarities, and the turntable is also 
rotated to determine the worst emitting configuration. The numerical results of the test are included herein to 
demonstrate compliance. The numerical results of the test are included herein to demonstrate compliance.  
 
The numerical results that are applied to the emissions limits are arrived as demonstrated by the example below: 
 
 
 
 
 
 
 
 
A. Frequency Measured in MHz. 
 
B. Meter Reading: Emission Amplitude as measured with the antenna in Vertical polarity in dBμV, this is from 
the EMI receiver or Spectrum Analyzer. 
 
C. Meter Reading: Emission Amplitude as measured with the antenna in Horizontal polarity in dBμV, this is 
from the EMI receiver or Spectrum Analyzer. 
 
D. Detector used: Q for Quasi-Peak, A for average, P for peak. 
 
E. EUT Side F/L/R/B: Side of EUT facing the receiving antenna. Front, Left, Right, Back. If not noted, 
emission did not peak in a significant manner to discriminate which side of the EUT emitted the emission. 
 
F. Ant. Height m: Antenna height in meters of strongest emission measured when raised from 1 to 4 meters. 
 
G. Max Reading: Max meter reading of B vertical and C horizontal in dBμV. 
 
H. Corrected Reading: Corrected Reading in dBμV/m; Max Reading corrected for cable loss (dB), antenna 
factor (dBV/m) and preamplifier gain (dB). 
 
I.  Spec limit: Specification Limit at the measured frequency in dBμV/m. 
 
J. CR/SL Diff.: Difference in dB of Corrected Reading and Specification Limit, negative results indicate a 
margin value below the specification limit. 
 
K. Pass Fail: Result; EUT does or does not comply at this frequency. 
 
 
For Radiated Emissions Test Configuration please refer to Figure 2 on the following page. 
 

A

B

C

D

E

F

G

H

I

J

K

Meas.

Meter

Meter

Det.

EUT

Ant.

Max.

Corrected

Spec.

CR/SL

Pass

Freq.

Reading

Reading

Side

Height

Reading

Reading

limit

Diff.

Fail

(MHz)

F/L/R/B

m

(dBμV)

(dBμV/m) (dBμV/m)

(dB)

47.2

44.5

44.6

Q

-

1.0

44.6

24.2

30.0

-5.8

Pass