HP 3336A - Page 138

Adjustments
Model
3336A/B/C
Required
Equipment:
@
Spectrum
Analyzer
(low
frequency)
-hp-
Model
3580A
1
to
1
Probe
-hp-
Model
10007B
a.
Set
the
3336
output
frequency
to
5
001
000
Hz.
b.
Connect
the
spectrum
analyzer
to
test
point
A2ITP11
using
a
1:1
probe.
c.
Manually
tune
the
spectrum
analyzer
to
the
1kHz
component.
It
may
be
necessary
to
misadjust
A21R76
to
find
this
signal;
however,
once
it
is
found,
the
analyzer
will
not
have
to
be
retuned.
d.
Adjust
A21R76
until
the
1
kHz
signal
is
at
its
minimum
amplitude.
e.
Change
the
3336
frequency
to
5
000
100
Hz.
f.
Adjust
A21R74
until
the
1
kHz
signal
is
at
its
minimum
amplitude.
g.
Change
the
3336
frequency
to
5
000
001
Hz.
h.
Adjust
A21R88
until
the
1
kHz
signal
is
at
its
minimum
amplitude.
i.
The
current
sources
that
have
been
adjusted
are
API
1,
API
2,
and
API
4.
API
3
and
API
5
are
not
adjustable.
@
5-15.
Analog
Phase
Interpolation
(API)
Spur
Adjustment.
5-16.
This
procedure
minimizes
the
API
100
kHz
spurs.
Required Equipment:
synthesizer
-hp-
Model
3335A
impedance
matching
pad
-hp-
Model
85428B
spectrum
analyzer
-hp-
Model
141T/
8552B/8553B
DVM
-hp-
Model
3466A
or
-hp-
Model
3455A
1
MHz
low
pass
filter
TT
Electronics
Inc.
Model
J903
a. Set up the 3335A as follows:
amplitude
........0.02000sceensetens
+7.00
dBm
(75
ohm
output)
fEQUENCY
sca
dace
eta
ew
meee
oes
20
MHz
b. Set up the 3336 as follows:
amplitude
...........0ceee
eee
eeeeees
~10
dBm
FrEQUENCY
.....
2.0
cee
cee
eee
e
neces
20
MHz
®
c.
Connect
the
DVM
and
adjust
the
phase
of
the
3336
to
obtain
0
volts
+10
mV
at
the
output
of
the
filter,
as
shown
in
the
following
figure.
5-4