Broadband
Signals
Emissions
o ccup
ying
a
broad
frequency
sp ectrum
relativ e
to
the
resolution
bandwidth
are
c
haracterized
as
broadband.
Sources
of
broadband
signals
can
b e
impulse
emissions
from
automobile
ignitions
systems,
digital
circuits,
switching
p o
w
er
supplies,
and
random
noise.
See
Figure
4-3.
Figure
4-3.
Broadband
Spectrum
Broadband
emissions
measuremen
t
requires
normalization
to
a
reference
bandwidth,
for
example,
1
MHz.
Common
broadband
measuremen
t
units
are
dBV/MHz
and
dBV/m/MHz
(eld
strength).
HP
8572A
EMI
Receiv
er
User's
Guide
Making
Typical
Measurements
4-3