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EMC Report for Harman Model JBL On Call 5310
File: 3129326LAX-009
Page 9 of 26
4.1.3
Field Strength Calculations
The field strength is calculated by adding the Quasi -peak reading on the EMI Receiver to the factors
associated with preamplifiers (if any), antennas and cables. A sample calculation is included below.
FS = RA + AF + CF
Where
FS = Field Strength in dB
µ
V/m
RA = Receiver Amplitude (including preamplifier) in dB
µ
V
CF = Cable Attenuation Factor in dB
AF = Antenna Factor in dB/m
AF = Antenna Factor in dB/m
Assume a receiver reading of 27 dB
µ
V is obtained. The antenna factor of 13.5 dB and cable factor of 0.5 dB
is added. The net field strength for comparison to the appropriate emission limit is 41 dB
µ
V/m.
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