JBL ON STAGE 200ID (serv.man3) EMC - CB Certificate ▷ View online
Ident. Nr.:
98323
Date:
2008-3-11
98323__EMC_TRF
page 17 of 46
5
Measurement of radiated emission
5.1 Standards
Generic standard
Product or product family standard
EN 55022:2006
Limit class
Class B
Basic standard
CISPR 16
Date of testing
2008.2.26
5.2 Measurement equipment
Equipment
Last Calibration
Type
Serial No
.
Manufacturer
EMI Test Receiver
January 25, 2007 ESI26
SB3436
Rohde & Schwarz
Bilog Antenna
January 25, 2007 CBL6112B SB3440
Chase
Semi-anechoic
chamber
chamber
March 21, 2007
9X6X6
SB3450/01 Albatross
Projects
5.3 Test set-up
The EUT has been tested according to the above-mentioned standard, as following:
The EUT was placed on the top of an insulating table 0.8 meters above the ground at a semi-
anechoic chamber. The table was rotated 360 degrees to determine the position of the highest
radiation. The EUT was set 3 meters away from the interference-receiving antenna, which was
mounted on the top of a variable-height antenna tower. The antenna is a broadband antenna, and its
height is varied from 1 to 4 meter above the ground to determine the maximum value of the field
strength. Both horizontal and vertical polarizations of the antenna are set to make the measurement.
For each suspected emission, the EUT was arranged to its worst case and then the antenna was
tuned to the heights from 1 to 4 meters and the ratable table was turned from 0 degrees to 360
degrees to find the maximum reading. The test-receiver system was set to Peak Detector Function
and Specified Bandwidth with Maximum Hold Mode.
The EUT was placed on the top of an insulating table 0.8 meters above the ground at a semi-
anechoic chamber. The table was rotated 360 degrees to determine the position of the highest
radiation. The EUT was set 3 meters away from the interference-receiving antenna, which was
mounted on the top of a variable-height antenna tower. The antenna is a broadband antenna, and its
height is varied from 1 to 4 meter above the ground to determine the maximum value of the field
strength. Both horizontal and vertical polarizations of the antenna are set to make the measurement.
For each suspected emission, the EUT was arranged to its worst case and then the antenna was
tuned to the heights from 1 to 4 meters and the ratable table was turned from 0 degrees to 360
degrees to find the maximum reading. The test-receiver system was set to Peak Detector Function
and Specified Bandwidth with Maximum Hold Mode.
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.
a rough figure of the test set-up is attached.
The test has been performed as following:
1) Preview test; Peak; IF BW=120kHz, VBW=300kHz, Antenna: from 1 to 4m Turntable 0-360deg
2) Find frequencies with maximum emission:
Acceptance-analysis: Limit minus 10 dB
Peak-reduction: 10Peaks frequency range 30 MHz - 1000 MHz
3) Final test; Quasi-Peak; measuring time 1 s; at frequencies from step 2); Search maximum: vary
turntable and antenna position to find the maximum readings
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.
Ident. Nr.:
98323
Date:
2008-3-11
98323__EMC_TRF
page 18 of 46
5.4 Test result
Mode
Diagram and Table Remarks
Result
TM1
Diagram
006
Table
008
H and V
Pass
TM2
Diagram
007
Table
008
H and V
Pass
Ident. Nr.:
98323
Date:
2008-3-11
98323__EMC_TRF
page 19 of 46
5.5 Diagrams and tables
5.5.1 Diagram 006
Operating Condition: Connect to PC
Test Specification: Horizontal & Vertical
Comment : AC 230V/50Hz
Operating Condition: Connect to PC
Test Specification: Horizontal & Vertical
Comment : AC 230V/50Hz
Ident. Nr.:
98323
Date:
2008-3-11
98323__EMC_TRF
page 20 of 46
5.5.2 Diagram 007
Operating Condition: Connect to iPod
Test Specification: Horizontal & Vertical
Comment: AC 230V/50Hz
Operating Condition: Connect to iPod
Test Specification: Horizontal & Vertical
Comment: AC 230V/50Hz
5.5.3 Table 008
Test Mode
Emission
Frequency
MHz
E-Field Polarity
Measured Level
dB
μV/m
Limit
dB
μV/m
TM1 172.008 V
36.0
40
TM1 220.501 H
33.3
40
TM2 46.112 V
32.8 40
TM2 20.040 V
32.0 40
The emissions don’t show are too low against the limits, the test curves are shown above.
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