Commercial
Compliance
Measurements
Detector
Selection
The
three
commonly
used
detection
mo
des
for
making
EMC
measuremen
ts
are:
P
eak
Detection
Av
erage
Detection
Quasi-P
eak
Detection
P
eak
Detection
A
p eak
measuremen
t
is
the
measured
p eak
v
oltage
referenced
to
the
RMS
v
alue
for
a
sin
usoidal
calibration
signal.
F
or
p eak
detection
on
the
EMI
receiv
er,
set
the
video
bandwidth
wider
than
the
resolution
bandwidth
and
place
the
analyzer
in
normal
detection
mo
de.
Av
erage
Detection
After
the
incoming
RF
input
has
b een
mixed
do
wn
to
the
IF
(see
Figure
4-5 ),
ltered
b
y
the
resolution
bandwidth
lters,
and
amplied
logarithmically
(dB)
or
linearly
(v
olts),
it
reac
hes
the
en
v
elop e
detector
and
video
lter.
En
v
elop e
detection
nds
the
p eak
v
oltage
of
the
signal.
The
video
lter
is
a
low-pass
lter
that
in
tegrates
(av
erages)
the
higher
frequency
comp onen
ts
(suc
h
as
noise)
at
the
output
of
the
detector.
HP
8572A
EMI
Receiv
er
User's
Guide
Making
Typical
Measurements
4-5