F
or
eective
a
v
eraging,
the
bandwidth
of
the
video
lter
m
ust
b e
smaller
than
the
resolution
bandwidth.
The
higher
the
ratio
of
resolution
bandwidth
to
video
bandwidth,
the
greater
the
a
v
eraging
will
b e.
See
Figure
4-6.
Figure
4-6.
Av
erage
Detection
Using
Video
Filtering
Because
the
video
lter
is
in
a
series
with
the
resolution
bandwidth,
lter
sw
eep
time
is
aected
b
y
the
video
bandwidth.
Th
us,
narrow
video
bandwidths
require
long
sw
eep
times.
HP
8572A
EMI
Receiv
er
User's
Guide
Making
Typical
Measurements
4-7