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Category
3
F
ailures
-
Inaccurate
(but
reasonably
functional)
Measurements
Troubleshooting
Spurious
Responses
and
Inaccurate
Data
Spurious
Signals
P
erform
the
\Spurious
Signals"
test
procedure
in
Chapter
1,
\P
erformance
T
ests
."
If
the
test
fails
,
perform
the
\LO
P
ower
Correction"
and
\Fractional-N
Spur
A
djustment"
procedures
in
\A
djustments
,"
Chapter
2.
Then
run
the
\Spurious
Signals"
test
again.
T
o
check
RF
at
A4J4:
Connect
a
spectrum
analyzer
to
the
source
RF
output
at
A4J4.
Set
the
network
analyzer
to
a
series
of
CW
frequencies
(e
.g.
10
MHz,
500
MHz,
1
GHz
in
hold-
trigger
mode)
and
use
the
spectrum
analyzer
to
check
for
harmonics
and
other
spurs
.
The
specication
for
harmonics
is
<020
dBc
below
1
MHz
and
<030
dBc
above
1
MHz.
Non-harmonic
spurious
signals
are
not
specied,
but
typical
values
are
the
same
as
for
harmonics
.
Connect
the
spectrum
analyzer
to
the
receiver
LO
output
at
A4J1
and
repeat.
If
there
are
spurs
in
source
RF
output
only
OR
receiver
LO
output
only
(not
both):
Replace
the
A4
source
assembly
.
If
there
are
spurs
in
source
AND
receiver
outputs:
The
problem
may
be
due
to
spurs
in
the
10
MHz
or
fractional-N
inputs
to
the
A4
source
assembly
.
Fractional-N
spurs
are
not
specied,
so
use
the
\Fractional-N
Spur
A
djustment"
to
improve
the
spur
performance
,
but
do
not
replace
the
fractional-N
board
unless
these
spurs
cause
the
analyzer
to
fail
its
harmonics
specications
.
T
o
check
10
MHz
at
A3J3:
Use
an
oscilloscope
to
look
for
a
2V
10
MHz
pulse
.
If
a
spectrum
analyzer
is
used,
a
blocking
capacitor
should
also
be
used
in
conjunction,
since
the
10
MHz
output
is
DC
coupled.
If
the
10
MHz
signal
has
spurs:
Replace
the
A3
fractional-N/reference
assembly
.
Otherwise:
Replace
the
A4
source
assembly
.
T
roubleshooting
and
Block
Diagrams
4-21
Содержание 87114B
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Страница 118: ...Figure 5 1 The Service Key Menus 5 2 Service Related Menus ...
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