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HP 3336A - Page 28

HP 3336A
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Model
3336A/B/C
3-25.
10
MHz
OVEN
OUTPUT
(Option
004).
3-26.
This
output
is
available
only
on
instruments
equipped
with
Option
004.
Option
004
is
a
temperature
stabilized
crystal
oscillator
with
an
aging
rate
specified
at
+5
x
10-
per
week
after
72
hours
of
operation.
Option
004
is
connected
to
the
instrument
with
a
BNC
to
BNC
adapter,
-hp-
part
number
1250-1499,
connecting
the
10
MHz
OVEN
Output
to
the
EXT
REF
Input.
The
EXT
REF
annunciator
will
be
on
continuously
when
the
instrument
and
Option
004
(or
any
frequency
standard)
are
phase-locked
together.
If
they
are
not
locked,
but
a
signal
is
present,
the
annunciator
will
flash
on
and
off.
3-27.
To
reduce
the
warm-up
time
and
realize
the
maximum
performance
from
an
instru-
ment
equipped
with
Option
004,
always
leave
the
instrument
connected
to
a
power
source.
Power
is
maintained
to
Option
004
whenever
the
instrument
is
plugged
in.
The
warm-up
time
for
an
instrument
equipped
with
Option
004
is
20
minutes
if
power
has
been
interrupted
for
less
than
24
hours.
If,
however,
power
is
interrupted
for
longer
than
24
hours,
it
may
take
as
long
as
72
hours
before
Option
004
will
meet
its
aging
rate
specification.
3-28.
The
signal
at
the
10
MHz
OVEN
Output
is
a
0
dBm
(50
ohms)
square
wave
and
is
pre-
sent
when
the
Model
3336
is
connected
to
a
power
source.
3-29.
REF
OUT
(Frequency
Reference
Output).
3-30.
This
output
supplies
a
1
MHz,
0
dBm
(50
ohm)
square
wave
derived
from
the
Model
3336’s
frequency
reference.
When
this
signal
is
applied
to
the
external
reference
input
of
a
compatible
instrument,
the
reference
oscillator
of
both
instruments
will
be
phase-locked
together.
3-31.
MANUAL
PROGRAMMING.
3-32.
Programming
the
Model
3336
from
the
front
panel
can
be
done
in
two
ways.
The
value
of
the
operating
parameter
may
be
set
exactly
using
the
Entry
keys
and
the
Number/Units
keyboard,
or
the
value
can
be
modified
using
the
Tuning
Knob
in
the
Modify
group.
3-33.
To
exactly
set
the
value
of
any
operating
parameter:
1.
Press
the
key
associated
with
the
desired
operating
parameter
(the
light
in
the
center
of
any
Entry
key
indicates
the
active
entry
parameter).
2.
Press
the
exact
number
sequence,
including
decimal
point
and
minus
sign,
of
the
value
to
be
assigned.
3.
Press
the
appropriate
Units
key
to
execute
the
entry.
3-34.
There
are
two
operating
rules
to
be
aware
of
when
modifying
frequency.
1.
If
the
last
frequency
entered
with
the
Number/Units
keyboard
is
within
the
specified
frequency
limits
of
the
selected
output,
the
frequency
can
be
modified,
using
the
Tuning
control
ONLY
within
those
frequency
limits.
2.
Frequency
can
be
modified
from
10
Hz
to
20.999
999
999
MHz
if
the
last
frequency
entered
with
the
Number/Units
keyboard
is
outside
the
specified
frequency
limits
of
the
selected
output.
Operation
3-7

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