JBL DUET II (serv.man5) EMC - CB Certificate ▷ View online
Ident. Nr.:
114383
Date:
2008-11-09
114383 EMC TRF.doc
page 9 of 38
4
Measurement of conducted emission
4.1 Standards
Product or product family standard
EN 55022:2006
Limit class
Class B
Basic standard
CISPR 16
Date of testing
2008-10-28
4.2 Measurement equipment
Equipment
Last Calibration
Type
Serial No
.
Manufacturer
EMI Test Receiver
January 25, 2008 ESCS30
SB2603
Rohde & Schwarz
AMN
January 25, 2008 ESH2-Z5
SB3321
Rohde & Schwarz
Limiter
January 30, 2008 ESH3-Z2
SB3319/01
Rohde & Schwarz
4.3 Test set-up
The test set-up was realized in a shielded chamber according to the above-mentioned standard. If
more details are necessary, e.g. because of wiring or auxiliary equipment, annex B with a photo or a
rough figure of the test set-up is attached.
The test has been performed as following:
more details are necessary, e.g. because of wiring or auxiliary equipment, annex B with a photo or a
rough figure of the test set-up is attached.
The test has been performed as following:
1) Preview test; Peak- and Average-Detector; measuring time 1 ms;
frequency step 4 kHz; all lines;
2) Find frequencies with maximum emission:
Acceptance-analysis: Limit minus 10dB
Peak-reduction:10Peaks frequency range 150 kHz - 30 MHz
3) Final test; Quasi-Peak and Average-Detector; measuring time 1 s;
at frequencies from step 2).
IF Bandwidth: 9kHz
4) If there are more than 10 peaks within the 10 dB margin a manual test with all settings is
necessary to find the maximum readings.
The EUT was placed on the top of an insulating table 0.8 meters above the ground at a shielded
room. The EUT was placed 0.4 meters from the conducting wall of shielded room with EUT being
connected to the power mains through a line impedance stabilization network (LISN). The LISN
provide 50Ohm/50μH of coupling impedance for the measuring instrument. Both lines of the power
mains connected to the EUT were checked for maximum conducted interference. The frequency
range from 150kHz to 30MHz was searched. The worst-case emissions are reported.
room. The EUT was placed 0.4 meters from the conducting wall of shielded room with EUT being
connected to the power mains through a line impedance stabilization network (LISN). The LISN
provide 50Ohm/50μH of coupling impedance for the measuring instrument. Both lines of the power
mains connected to the EUT were checked for maximum conducted interference. The frequency
range from 150kHz to 30MHz was searched. The worst-case emissions are reported.
4.4 Test result
Power ports
AC input
Mode
Diagram
Remarks
Result
Diagram
001
Line L
Pass
TM 1
Diagram
002
Line N
Pass
Ident. Nr.:
114383
Date:
2008-11-09
114383 EMC TRF.doc
page 10 of 38
4.5 Diagrams and tables
4.5.1 Diagram 001
Conducted Disturbance
EUT:
M/N:Duet II
Op Cond:
Connect to PC (Play MP3)
Test Spec:
L
Comment:
AC 230V/50Hz
0
10
20
30
40
50
60
dBuV
70
0.15
MHz
30
1
10
ConQP_B
ConAV_B
Mkr : 222.00 kHz 47.8 dBuV
Ident. Nr.:
114383
Date:
2008-11-09
114383 EMC TRF.doc
page 11 of 38
4.5.2 Diagram 002
Conducted Disturbance
EUT:
M/N:Duet II
Op Cond:
Connect to PC (Play MP3)
Test Spec:
N
Comment:
AC 230V/50Hz
0
10
20
30
40
50
60
dBuV
70
0.15
MHz
30
1
10
ConQP_B
ConAV_B
Mkr : 3.21000MHz 40.9 dBuV
Ident. Nr.:
114383
Date:
2008-11-09
114383 EMC TRF.doc
page 12 of 38
4.5.3 Table 003
L
N
QuasiPeak
(dBμV)
Average
(dBμV)
QuasiPeak
(dBμV)
Average
(dBμV)
TM
Frequency
(MHz)
Test
value
limit
Test
value
limit
Frequency
(MHz)
Test
value
limit
Test
value
limit
0.150 50.3 66 31.5
56 0.162 52.4
65.3
36.3 55.3
TM1
0.222 42.8
62.7
30.6 52.7
3.210 37.1 56 31.7 46
The emissions don’t show are too low against the limits, the test curves are shown above.
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