ETS-Lindgren 5411 GTEM! Test Cell User Manual
Page 83
Radiated Emissions Test Performance of GTEM!
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83
Table 5: Resonant Dipole Data, GTEM! versus OATS at 3 Meters
The third dipole test was performed in the same manner as the first, with the
exception that an extended frequency range of the evaluation was desired.
Where only resonant dipoles were used in the first evaluations, short dipoles
were added to allow the extension of the evaluation down to 50 MHz. Tuning the
resonant dipole to 230 MHz and lowering the frequency of excitation in steps to
50 MHz accomplished this. The dipoles were tuned to resonance at 230 MHz
and above. The data is summarized in the following table. Note that the data was
acquired with different instrumentation at different test sites using a
different GTEM!, resulting in an independent set of data.
The average difference between the GTEM! and the OATS is –1.62 dB and the
standard deviation is 2.68 dB.
Frequency
(MHz)
GTEM!
Computed Field
Strength
(dB uV/m)
OATS Measured
Field Data
(dB uV/m)
Difference
(dB)
50.0
45.8
45.0
-0.8
100.0
69.3
73.1
+3.8
200.0
88.5
84.4
-4.1
230.0
96.0
88.7
+7.7
250.0
92.7
91.9
-0.8
300.0
99.8
97.3
-2.5
400.0
100.3
100.5
+0.2
500.0
101.3
100.7
-0.6
600.0
98.3
98.1
-0.2
700.0
99.7
96.7
-2.9
800.0
99.8
99.5
-0.3
900.0
100.2
97.3
-2.9
1000.0
99.6
97.3
-2.3