Test Environment
Integration Guidelines
10-2
The distance of the antenna to the UUT was 10m according to the EN 55022 (CISPR22)
requirement. The emission value for standards expecting different antenna distances (FCC)
was automatically recalculated during the measurement. The antenna height, polarization
and the orientation of the UUT to the antenna was varied for each pre-scanned frequency
to find the maximum emission value (antenna height 1m-4m, polarization vertical and
horizontal; UUT on a rotating desk 0° to 360°).
EMI test results
The radiated emission listing shows that the CoBox-Micro UUT passed FCC class-A limits
as well as CISPR22 class-A. Highest emission outputs are at 80Mhz and 120Mhz, leading
to a margin of 5dB at 120Mhz to the more stringent CISPR22 class-A limit.
Table 10-1: CoBox-Micro Results
Frequency
MHz
Field Strength
EN55022 Level at
10m
dBµV/m
Limit Class A
dBµV/m
DELTA
dB
Remarks
40.015
21.53
40.00
-18.47
60.003
27.75
40.00
-12.25
80.008
30.26
40.00
-9.74
100.015
22.97
40.00
-17.03
120.008
34.95
40.00
-5.05
140.015
21.16
40.00
-18.84
160.008
25.01
40.00
-14.99
180.014
22.54
40.00
-17.46
200.01
24.95
40.00
-15.05
208.539
20.85
40.00
-19.15
220.015
26.96
40.00
-13.04
228.541
27.20
40.00
-12.80
240.01
35.46
47.00
-11.54
260.015
31.85
47.00
-15.15
265.71
30.59
47.00
-16.41
268.52
30.65
47.00
-16.35
280.015
27.18
47.00
-19.82
