HP 3336A - Page 137

Model 3336A/B/C
NOTE
The -hp- 3336 must be connected to ac power for at least 72 hours
before making this adjustment.
a.
Make
sure
the
special
BNC
to
BNC
adapter,
supplied
with
Option
004,
is
connected
between
the
10
MHz
Ref
Output
and
the
Ext
Ref
Input,
and
that
the
EXT
REF
annunciator
is
ON.
b.
Connect
the
3336’s
75
ohm
output
to
the
electronic
counter
using
the
75
ohm
Feedthru
Termination
at
the
counter’s
Hi
Z
input.
c.
Set
the
3336
output
amplitude
to
+7.00
dBm
(maximum)
and
frequency
to
20
MHz.
d.
Set
the
electronic
counter
controls
to
resolve
.1
Hz.
On
the
-hp-
5328A,
this
may
make
the
counter
overflow.
This
overflow
condition
does
not
affect
the
accuracy
of
the
measure-
ment,
and
the
overflow
digit
may
be
determined
by
changing
the
resolution
to
1
Hz.
e.
Adjust
A9R7
until
the
counter
reads
20
MHz
as
accurately
as
possible.
The
specifica-
tion
is
20
MHz,
+
1
Hz.
f.
If
A9R7
does
not
have
enough
range,
remove
the
access
screw
from
the
Coarse
Fre-
quency
Adjustment
on
the
Oven
assembly.
g.
Adjust
A9R7
to
mechanical
center
and
then,
using
a
non-conductive
tool,
adjust
the
Coarse
Frequency
Adjustment
until
the
counter
reads
20
MHz
as
accurately
as
possible.
h. Replace the access screw and readjust A9R7.
5-11. Voltage Controlled Oscillator Range Adjustment.
5-12.
This
adjustment
sets
the
low
frequency
tune
voltage
to
the
VCO
and
checks
the
VCO
frequency
versus
tune
voltage
range.
Required Equipment:
dc
Voltmeter
-hp-
Model
3466A
a.
With
the
-hp-
3336
in
its
turn-on
condition,
measure
the
dc
voltage
at
test
point
A21TP11
b.
Set
the
-hp-
3336
frequency
to
60
MHz.
Using
a
non-conductive
tool,
adjust
A21L162
until
the
voltmeter
reads
-3.00Vdc
+.05V.
c.
Set
the
frequency
to
10
kHz.
The
voltmeter
should
read
10V
+2V.
5-13.
Analog
Phase
Interpolation
(API)
Current
Source
Adjustment.
5-14.
This
procedure
adjusts
the
API
current
sources,
reducing
the
corresponding
API
phase
modulation
sidebands
to
their
minimum
value.
Adjustments