NARDA PMM AS02, Руководство пользователя

Страница: 50 / 56

3-2 Radiated Emission and Immunity testing
3.1.5 The meter receiver The meter receiver is typically either a radio receiver or a spectrum
analyzer. Either a 120 kHz bandwidth and an output indication calibrated in
dB
μ V are required.
The calculation of the measured E-field signal level is given by:
where:






m
V
dB E
μ
=Corresponding Electric field
( )
V dB S
μ
= Measured signal strength
( )
dB C
1
= Preamplifier interconnecting cable
( )
dB PA
= Preamplifier gain
( )
dB C
2
= Interconnecting cable loss






m
dB AF
1
= Antenna factor
Fig. 3-1 Radiated emission test setup
( ) ( ) ( ) ( )






+ + − + =






m
dB AF dB C dB PA dB C V dB S
m
V
dB E
1
2 1
μ
μ
EU T
Antenna
Pream plifier
R eceiver or
Spectrum Analyzer
3 or 10 m
C able C able
AF
C 1 C 2
PA
S