
No
de
26
Ext
Ref
(rear
panel
external
reference
input)
P
erform
step
A12,
ab o
v
e,
and
then
press
4
MEAS
5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNN
ANALOG
IN
4
26
5
4
x1
5.
The
v
oltage
lev
el
of
this
no de
indicates
whether
an
external
reference
timebase
is
b eing
used:
No
external
reference:
ab out
00.9
V
With
external
reference:
ab out
00.6
V
No
de
27
V
CX
O
T
une
(40
MHz
V
CX
O
tuning
v
oltage)
P
erform
step
A12,
ab o
v
e,
and
then
press
4
MEAS
5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNN
ANALOG
IN
4
27
5
4
x1
5
4
MARKER
F
CTN
5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
MARKER
REFERENCE
.
This
no de
displays
the
v
oltage
used
to
ne
tune
the
A12
reference
V
CX
O
to
40
MHz.
Y
ou
should
see
a
at
line
at
some
v
oltage
lev
el
(the
actual
v
oltage
lev
el
v
aries
from
instrumen
t
to
instrumen
t).
An
ything
other
than
a
at
line
indicates
that
the
V
CX
O
is
tuning
to
dieren
t
frequencies.
Refer
to
the
\F
requency
Accuracy"
adjustmen
t
pro cedure.
No
de
28
A12
Gnd
2
(Ground
reference)
A14
Fractional-N
(Digital)
T
o
observ
e
the
A14
analog
bus
no des
p erform
step
A14,
b elow.
Then
follo w
the
no de-sp ecic
instructions.
Step
A14.
Press:
4
PRESET
5
4
MEAS
5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNN
ANALOG
IN
4
SYSTEM
5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SERVICE
MENU
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
ANALOG
BUS
ON
4
F
ORMA
T
5
NNNNNNNNNNNNNN
MORE
NNNNNNNNNNNNNN
REAL
DRAFT
3/21/106
15:14
Service
Key
Menus
and
Error
Messages
10-35
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