Because
the
signal
of
in
terest
is
in
the
0.15
to
30
MHz
region
(5
MHz),
the
9
kHz
quasi-p eak
bandwidth
(QP
A
BW)
is
selected.
According
to
the
table
on
the
fron
t
of
the
quasi-p eak
adapter,
resolution
and
video
bandwidths
are
100
kHz.
7.
T
o
read
amplitude
in
dBV,
press
4
SHIFT
5
C
on
the
sp ectrum
analyzer.
8.
Adjust
the
reference
lev
el
to
bring
the
signal
near
the
top
of
the
display
.
9.
Disconnect
the
signal
source.
Connect
the
RF
preselector
com
b
generator
output
to
receiv
er
INPUT
1.
Note
Before
calibrating
the
system:
Make
sure
all
equipmen
t
settings
are
correct.
Do
not
c
hange
resolution
bandwidth,
scale,
attenuation,
or
input
p ort
after
calibration.
(The
start
and
stop
frequencies
may
b e
c
hanged
after
calibration
if
the
frequency
range
stays
within
the
range
at
whic
h
the
receiv
er
w
as
calibrated.)
T
o
ensure
b est
amplitude
accuracy
when
making
measuremen
ts,
recalibrate
the
system
whenev
er
y
ou
c
hange
a
parameter.
Manually
set
critical
system
parameters,
suc
h
as
resolution
bandwidth.
P
arameters
that
are
set
man
ually
will
not
c
hange
during
the
calibration
routine;
parameters
that
are
still
in
the
auto-coupled
mo
de
may
c
hange
during
the
calibration
routine.
On
the
preselector,
press
CAL
SEQ
4
ST
ART
5.
The
sp ectrum
analyzer
will
measure
selected
com
b
teeth.
An
y
v
ariation
b et
w
een
the
measured
com
b
to
oth
stored
in
the
preselector
section
is
corrected
b
y
an
in
ternal
preselector
section
gain
adjustmen
t.
The
CAL
SEQ
LED
ashes
while
the
calibration
routine
runs.
Note
After
calibration,
the
CAL
SEQ
LED
stays
on,
indicating
that
the
system
is
calibrated
o
v
er
the
curren
t
frequency
range.
If
the
frequency
range
is
increased
b ey
ond
the
calibrated
range,
the
light
turns
o,
to
indicate
an
uncalibrated
state.
Ho
w
ev
er,
the
CAL
SEQ
light
do es
not
turn
o
when
parameters
other
than
the
frequency
range
(start
and
stop
frequency)
are
c
hanged.
Therefore,
y
ou
may
ha
v
e
an
uncalibrated
state
while
the
CAL
SEQ
light
is
still
on.
Be
sure
the
receiv
er
is
calibrated
for
the
curr
ent
instrumen
t
settings.
Disconnect
the
preselector
section's
com
b
generator
output
and
reconnect
the
signal
source
to
Input
1
of
the
preselector
section.
Use
the
same
cable
during
measuremen
ts
that
y
ou
used
for
calibration,
b ecause
the
system
has
comp ensated
for
the
loss
in
this
5-2
Do
wnloadable
Program
(DLP)
Measurements
HP
8572A
EMI
Receiv
er
User's
Guide