Intertek Testing Services
Ericsson Inc.
Model: DT-620
FCCID: AXAROA1173201
Report Name: ERI2433.DOC
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8.0 Test Procedures
The following is a description of the test procedure used by Intertek Testing Services in the measurements
of transmitters operating under FCC Part 15 rules.
8.1
Cross Reference to Subpart B
8.1.1 §15.309 Radiated Emissions
The radiated emissions were tested as per ANSI C63.4: 1992.
Radiated emissions from the DT-620 were measured using a spectrum analyzer with a quasi-peak adapter.
A preamplifier with a gain of 16 dB was used to increase the sensitivity of the measuring instrumentation.
The spectrum analyzer’s resolution bandwidth was set as follows:
Measurement Bandwidth Settings
Peak and Quasi-Peak
Average
Frequency Range, MHz
Resolution
Bandwidth
Video
Bandwidth
Resolution
Bandwidth
Video
Bandwidth
0.45 – 30
9 kHz
30 kHz
N/a
N/a
30 – 1000
120 kHz
300 kHz
N/a
N/a
> 1000
1 MHz
3 MHz
1 MHz
10 Hz
A Chase Biconilog antenna was used to measure emissions in the frequency range of 30 to 1000 MHz, and
a double-ridge guide antenna was used to measure emissions in the frequency range of 1GHz to 20 GHz.
All measurements were made with the antenna located 3 meters away from the EUT unless otherwise
indicated. The readings obtained by these antennas were correlated to the levels obtained with a tuned
dipole antenna by adding the antenna factors.
The equipment under test (EUT) was placed on a 1 x 1.5 meter wooden table which is 0.8 meters in height
above the ground-plane. During the radiated emissions test, the turntable is rotated and any cables leaving
the EUT are manipulated to find the configuration resulting in maximum emissions. The antenna height
and polarization are also varied during the testing to search for maximum signal levels. The height of the
antenna is varied from one to four meters.
The EUT is warmed up for 15 minutes prior to the test.
Where pulsed transmissions of short enough pulse duration warrant, a greater bandwidth is selected
according to the recommendations of Hewlett Packard Application Note 150-2
Transmitter measurements are normally conducted at a measurement distance of three meters. However, to
assure low enough noise floor in the restricted bands and above 1 GHz, signals may be acquired at a
distance of one meter or less. All measurements are taken at three meters unless otherwise noted on the data
tables.
8.1.2 §15.315 AC Power Line Conducted Emissions
The AC power line conducted emissions were tested per ANSI C63.4: 1992
Power line conducted emissions were measured using a spectrum analyzer with a quasi-peak adapter. The
measurement bandwidths used are indicated in the table above. Line conducted measurements were made
using a 50
:
H line impedance stabilization network on the open area site using a vertical ground plane
located 40 cm away from the EUT.
