16.
AM
Accuracy
Description
and
Procedure
This
pro cedure
measures
the
AM
accuracy
of
the
syn
thesizer.
The
lo
cal
oscillator
and
mixer
are
used
to
do
wncon
v
ert
the
syn
thesizer
frequency
to
the
frequency
range
of
the
measuring
receiv
er
(an
HP
11793A
Microw
a
v
e
Con
v
erter
can
b e
substituted
for
the
mixer).
F
or
measuremen
ts
ab o
v
e
20
GHz
RF
output
frequency
,
a
sp ectrum
analyzer
with
external
mixer
are
used
to
do
wncon
v
ert
to
a
321.4
MHz
RF.
The
function
generator
pro
vides
AM
mo
dulation.
The
function
generator
signal
lev
el
is
adjusted
for
30%
AM
as
measured
b
y
the
measuring
receiv
er.
The
function
generator
signal
lev
el
is
c
hec
k
ed
for
accuracy
.
A
D
VM
may
b e
necessary
to
measure
the
function
generator
output.
1.
T
urn
on
the
equipmen
t
sho
wn
in
Figure
2-23.
Preset
the
instrumen
ts
and
let
them
w
arm
up
for
at
least
one
hour.
2.
On
the
measuring
receiv
er,
calibrate
and
store
the
AM
calibration
factor.
Lo
w
Band
<
2
GHz
Disr
e
gar
d
if
b
eyond
your
synthesizer's
c
ap
ability.
3.
Connect
the
equipmen
t
as
sho
wn
in
Figure
2-23 .
2-96
P
erformance
T
ests
AM
Accuracy
HP
8360
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