emc testing report

EMC TESTING
REPORT
Electromagnetic Compatibility and Interference
Laboratory
University of Maryland, College Park
Director: Prof. O. Ramahi
PhD Student: Mohammad H. Kermani
Date: Oct. 31st, 2002
This report provides the measurement results of EMC Testing conducted in
Electromagnetic Compatibility and Interference Lab. at University of
Maryland on Oct. 31st.
Frequency Range of Measurements:
1) 30-300MHz (Biconical Antenna)
2) 0.3-1GHz (Logperiodic Antenna)
Receiver Antennas:
1) Biconical (Frequency Range: 30-300MHz)
Model 3110B from ETS-Lindgren Co., (http://www.emctest.com/pdf/Ant2.pdf)
Antenna Factors:
Freq.
(MHz)
Antenna
Factor
Freq.
(MHz)
Antenna
Factor
30
40
50
60
70
80
90
100
110
120
130
140
150
160
14.5
11.5
9.7
9.1
9.2
9.6
10.2
10.7
11.2
11.6
12
12.4
12.7
13.1
170
180
190
200
210
220
230
240
250
260
270
280
290
300
13.2
13.6
14.2
15.2
15.9
16.9
18
18.6
19.2
19.7
20.2
20.7
21.3
21.5
2) Logperiodic (Frequency Range: 0.3-1GHz)
Model 3148 from ETS- Lindgren Co., (http://www.emctest.com/pdf/Ant3.pdf)
Freq.
(MHz)
Antenna
Factor
300
325
14.
0
15.5 15.4 15.5 16.2 16.5 17.3 17.9 18.5 18.8 18.9 19.2 19.6 19.8
Freq.
(MHz)
Antenna
Factor
650
675
Freq.
(MHz)
Antenna
Factor
350
700
375
725
400
750
425
775
450
800
475
825
500
850
525
875
550
900
575
925
600
950
625
975
20.
21.5 22.2 22.4 22.3 22.3 22.2 22.3 22.5 22.9 23.3 23.7 23.5 23.6
4
100
0
23.
8
EMC Analyzer:
E7405A EMC Analyzer, 9KHz to 26.5GHz, Agilent Technologies (www.agilent.com)
Chamber:
SpaceSaver™ 80 from ETS-Lindgren Co.
(http://www.emctest.com/productpage.cfm?model=SpaceSaver80&producttype=Chambe
rs)
Distance between EUT and Receiver Antenna: 3m
FCC Regulation (Section 15.109 Radiated Emission Limits):
Frequency (MHz)
30 - 88
88 - 216
216 - 960
960-1000
Field Strength (microvolts/meter)
100
150
200
500
dBµV/m
40
43.5
46
54
EUT: Bisty Plus
Company: Applieddata (www.aplieddata.com)
**** : Georgi Ivanov
Terminology:
The following terminology is used throughout the document*:
BP: Bitsy Plus
BP+CF: Bitsy Plus with Compact Flash connector board
BP+MM: “MiniMo” unit
AGND: One end of 30cm long wire is been soldered to the unit’s analog ground. The other end is
left free
Choked n times: The power cable has been turned around the ferrite cylinder n times. The
cylinder is very close (approx. 2 cm) to the power connector.
The relative physical orientations of the EUT and Antenna are defined as**:
Face: EUT lies on the table on its solder side and its longer side faces the antenna
Shorter Side of
the Board
Logperiodic Antenna
EUT
Solder Side
3m
Longer Side of
the Board
Top View of Face Orientation
Side : EUT lies on the table on its solder side and its shorter side faces the antenna
Longer Side
of the Board
Logperiodic Antenna
EUT
BP
Solder Side
3m
Shorter Side
of the Board
Top View of Side Orientation
Upright: EUT lies on the table on its longer side and its solder side faces the antenna
Longer Side
of the Board
Logperiodic Antenna
EUT
3m
Shorter Side
of the Board
Solder Side
Top View of Upright Orientation
*: This Terminology is based on Georgi Ivanov’s Report.
**: This relative physical orientations is based on Gerogi Ivanov’s Report
Mesurements (300MHz-1GHz)
Notes:
1) The white line in each figure shows the FCC Emission limits for Class B at a distance
of 3 meters between EUT and Antenna
2) The blue line shows the Maximum hold of Electric Field Intensity during the
measurement
3) The yellow line shows the Electric Field Intensity at the recording time
Bitsy Plus, “face”
Logperiodic Antenna
Solder Side
EUT
BP
3m
Bitsy Plus, “side”
Logperiodic Antenna
Solder Side
EUT
BP
3m
Bitsy Plus, “upright”
Logperiodic Antenna
EUT
BP
3m
Solder Side
Bitsy Plus, AGND, “face”
Logperiodic Antenna
Solder Side
AGND
EUT
BP
3m
Bitsy Plus, “choked” ½ times, “face”
Logperiodic Antenna
Solder Side
EUT
BP
3m
Bitsy Plus+ CF, “face”
Logperiodic Antenna
Solder Side
EUT
BP+CF
3m
Bitsy Plus+MiniMo, “face”
Logperiodic Antenna
Solder Side
EUT
BP+MM
3m
Bitsy Plus+MiniMo, “upright”
Logperiodic Antenna
EUT
BP+MM
3m
Solder Side
Bitsy Plus+MiniMo, AGND, “face”
Logperiodic Antenna
Solder Side
AGND
EUT
BP+M
3m
Mesurements (30MHz-300MHz)
Bitsy Plus, “face”
Logperiodic Antenna
Solder Side
EUT
BP
3m
Bitsy Plus, “side”
Logperiodic Antenna
Solder Side
EUT
BP
3m
Bitsy Plus, “upright”
Logperiodic Antenna
EUT
BP
3m
Solder Side
Bitsy Plus, “choked” 2½ times, “face”
Logperiodic Antenna
Solder Side
EUT
BP
3m
Bitsy Plus+ CF, “face”
Logperiodic Antenna
Solder Side
EUT
BP+CF
3m
Bitsy Plus+CF “upright”
Logperiodic Antenna
EUT
BP+CF
3m
Solder Side
Bitsy Plus+MiniMo, AGND, “face”
Logperiodic Antenna
Solder Side
AGND
EUT
BP+MM
3m
Bitsy Plus+MiniMo, “choked”, AGND, “face”
Logperiodic Antenna
Solder Side
AGND
EUT
BP+MM
3m
Bitsy Plus+ MiniMo, AGND shorted to GND, “face”
Logperiodic Antenna
Solder Side
AGND
EUT
BP+M M
3m