Sapido RB-1830 Bedienungsanleitung Seite 52

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Reference No T11112830801-RE
Report No T11112830801-RE
Page 7 /
50
3. TEST METHODOLOGY
All tests were performed in accordance with the procedure documented in ETSI EN 301
489-1
V1.6.1 (2005-09)
as referenced in ETSI EN 301 489-17
V1.2.1 (2002-04)
.
3.1 UNIT OF MEASUREMENT
Measurements of radiated interference are reported in terms of dB(uV/m) at a specified
distance. The indicated readings on the Spectrum analyzers were converted to dB (uV/m)
by use of appropriate conversion factors. Measurements of conducted interference are
reported in terms of dB(uV).
The field strength is calculated by adding the Antenna Factor and Cable Factors and
subtracting the Amplifier Gain from the measured reading. The following is a sample
calculation:
FS = RA + AF + CF – AG
Where FS = Field Strength
RA = Receiver Amplitude
AF = Antenna Factor
CF = Cable Attenuation Factor
AG = Amplifier Gain
Assume a receiver reading of 52.5 dBuV is obtained. The Antenna Factor of 7.4dB/m
and a Cable Factor of 1.1dB are added. The Amplifier Gain of 29 dB is subtracted, giving
field strength of 32 dBuV/m. The 32-dBuV/m values was mathematically converted to its
corresponding level in uV/m.
FS = 52.5 + 7.4 + 1.1 – 29 = 32 dBuV/m
Note: Level in uV/m = Common Antilogarithm [(32 dBuV/m)/20] = 39.8 uV/m
3.2 ANTENNA
The calibrated antennas used to sample the radiated field strength are mounted on a
non-conductive, motorized antenna mast 10 meters from the leading edge of the
turntable.
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