Agilent Technologies 83620A - FM Accuracy

19.
FM
Accuracy
Description
and Procedure
Use this
pro cedure
to
measure
the
FM
accuracy
of
the
syn
thesizer.
With
the
syn
thesizer
set
to
an
FM
sensitivit
y
of
10
MHz/V,
and
the function
generator
pro
viding
an
FM mo
dulation index
of 2.404,
the RF
output
should
b
e
a
n
ull.
The function
generator
amplitude
is
adjusted
for
the
Bessel
n
ull
and
the
dierence
b
et
w
een
signals
is
recorded.
Note
Since
the
mo
dulation
frequency
for external
FM is
1 MHz,
this
pro
cedure
relies
on
the
v
oltage-setting
accuracy
of
the
function generator
(the
frequency
is
to
o
high
for
a
D
VM,
and
an
oscilloscop
e
is
not
accurate enough.)
External
FM
1.
Connect
the
equipmen
t
as
sho
wn
in
Figure
2-28
.
Preset
all
instrumen
ts
and
let
them
w
arm
up for
at
least
one
hour.
Figure 2-28. FM Accuracy T
est Setup
2-114 Performance Tests
FM Accuracy
HP 8360
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