19.
FM Accuracy
(F
or
B-Series
Only)
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
warm
up for
at
least
one
hour.
Figure 2-28. FM Accuracy T
est Setup
Equipment
Spectrum Analyzer
HP/Agilent 8566B
Function Generator
HP/Agilent 3325A
2. Toachievepeakpower on the synthesizer, turn on RF peaking. Press:
4
USER CAL
5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
Tracking Menu
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
Peak RF Always
(asterisk on)
3. On the synthesizer, press:
4
CW
5
First synthesizer frequency in Table 2-27
4
POWER LEVEL
5
Set the sp ecied maximum leveled power
2-92 Performance Tests
FM Accuracy
Agilent 8360
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