Calibrating
Receiv
er
INPUT
1
and
INPUT
2
Note
Receiv
er
INPUT
1
and
receiv
er
INPUT
2
are
input
1
and
input
2
on
the
HP
85685A
RF
preselector.
When
calibrating
receiv
er
INPUT
1
and
receiv
er
INPUT
2 ,
complete
the
pro cedure
for
eac
h
new
com
bination
of
frequency
range,
resolution
bandwidth,
logarithmic/linear
scale,
and
attenuation
settings.
T
o
calibrate
receiv
er
INPUT
1
and
receiv
er
INPUT
2 :
1.
Connect
the
100
MHz
CAL
OUTPUT
on
the
sp ectrum
analyzer
to
receiv
er
INPUT
2
on
the
RF
preselector.
2.
On
the
quasi-p eak
adapter,
select
the
b
ypass
path
b
y
pressing
the
BYP
ASS
k
ey
in
the
INSTR
FUNCTION
group.
The
LED
ab o
v
e
that
k
ey
will
light.
3.
On
the
RF
preselector,
select
the
b
ypass
path
b
y
pressing
the
ENABLE
4
5
k
ey
and
the
BYP
ASS
4
5
k
ey;
the
BYP
ASS
LED
near
receiv
er
INPUT
2
will
light.
4.
Select
the
preamplier
b
ypass
path
b
y
pressing
the
SWITCHES
0
4
5
k
ey
on
the
attenuator/switc
h
driv
er;
the
LED
in
that
k
ey
will
light.
5.
Press
4
RECALL
5
4
8
5
on
the
sp ectrum
analyzer.
6.
Adjust
AMPTD
CAL
on
the
sp ectrum
analyzer
for
010
dBm
60.20
dB.
7.
Press
4
RECALL
5
4
9
5
on
the
sp ectrum
analyzer.
8.
Adjust
FREQ
ZER
O
on
the
sp ectrum
analyzer
for
a
maxim
um
signal
on
the
display
.
9.
Select
the
frequency
range,
resolution
bandwidth,
logarithmic/linear
scale,
and
attenuator
settings
to
b e
used
for
the
desired
measuremen
t.
10.
Select
the
quasi-p eak
adapter
bandwidth
for
the
measuremen
t.
11.
Connect
the
COMB
GENERA
TOR
OUTPUT
on
the
RF
preselector
to
the
receiv
er
input
to
b e
calibrated.
12.
Execute
the
com
b
calibration
sequence
b
y
pressing
CAL
SEQ
4
ST
ART
5
on
the
RF
preselector.
If
the
start
frequency
is
b elow
200
kHz,
the
sp ectrum
analyzer
will
display
the
100
kHz
com
b
signal
and
y
ou
will
b e
instructed
to
adjust
AMPTD
CAL
on
the
sp ectrum
analyzer
for
the
display
ed
amplitude
of
the
100
kHz
com
b
to
oth
to
within
60.2
dB .
If
the
100
kHz
calibration
signal
amplitude
is
within
60.2
dB
of
the
desired
v
alue,
no
adjustmen
t
is
necessary;
the
calibration
sequence
will
con
tinue
automatically
.
HP
8572A
EMI
Receiv
er
User's
Guide
Calibrating
Y
our
Receiv
er
1-3