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Section
V
Model 339
A
i.
Reduce
the
AC
calibrator
output
to
0,94
V.
j.
Adjust
A2R35
(LOW
LIMIT ADJUST)
until
the
INPUT R
ANGE
low
limit
indicator
just
lights.
k.
Increase the
AC
Calibrator output
to
0.95 V.
The
low
limit
indicator
should
turn
off. If
not,
repeat
Steps
i
and
j.
l.
Increase the
AC
Calibrator output
to 3.10 V.
Note
that
both high
and low
INPUT
RANGE
indicator
tights
are
OFF
Reconnect
the
cable to
A2J2. Return
the
LINE
switch
to
ON.
5-13.
OSCILLATOR ADJUSTMENTS.
5-14,
Amplitude Adjustment.
Equipment
Required:
Digital
Voltmeter
(-hp-
Model 3465A)
a.
Set the
339A
controls as
follows:
m.
Increase the
AC
Calibrator output
to 3.4
V.
The
INPUT
RANGE
high
limit
indicator
should
light.
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Set the
USE
switch
OFF
before
performing
the
following
steps
to
prevent
damaging
A?
17.
FREQUENCY
10
Hz
(1.0
x
10)
FREQUENCY
VERNIER
CAL
OSCILLATOR LEVEL
3V
(vernier
fully
CW)
b.
Set the
DVM
to
measure
DC
volts (2
volt range).
Conned
the
DVM's
high input
to
A1TP8
and
the
low
input
to the
A1
assembly
shield
n.
Set the
339A
LFNE
switch
OFF.
o.
Disconnect
the
cable
from
A2J2.
Place the cable in
such a
manner
that
it
will
not short
against the chassts or
components on
the
PC
assembly,
p.
Install a
jumper
wire
between
A2TPI
and
A2TP8.
q.
Set the
DVM
to
measure
DC
volLs
(20
volt
range).
Connect
the
DVM's
high input
to
A2TP9
and
the
low
input
to
the
A2
assembly
shield,
c.
Adjust
A1R30
(AMPLITUDE
ADJUST)
for
a
DVM
reading of
-0.4
V
dc
±0.1
V
dc.
5-15.
Frequency
Adjustment.
Equipment
Required:
Electronic
Counter
(-hp-
Model
5300,
A
mainframe.
Model 5302A
Universal
Counter
Module
1
a.
Set
Lhe
339A
controls as tollows:
r.
Set the
AC
Calibrator
for
an
output of
3
V
at
1
kHz.
s.
Set
the
339A
LINE
switch
ON.
A.
Adjust
A2R24
(AUTO SET-LEVEL FULL
SCALE
ADJUST)
for
a
DVM
reading
of
*3.162
V
dc.
u.
Reduce
the
AC
Calibrator output
to
1
V.
v.
Adjust
A2R22 (ALTO-SET
LEVEL
1,
3
SCALE
ADJUST)
for
a
DVM
reading of *3.162
V
dc.
NOTE
FREQUENCY
10
kHz
<1.0
x
10
K)
FREQUENCY
VERNIER
CAL
OSCILLATOR LEVEL
3
V
(vernier
fully
CW)
b.
Connect
the Electronic
Counter
input to
the
339A
Oscillator output.
c.
Adjust
A1C7
(10
kHz
adjust)
for
a
counter
indication
of
10
kHz -
10
Hz.
d.
Set
the
339A
FREQUENCY
controls
for
a
frequency of
100
kHz.
(10.0
x
10 K).
The
adjustment
of
A2R22
and
A2R24
interact.
Repeat Steps
r
through
v
until the
DVM
indication
at
both
full-scale
and
1/3
scale
is
*3.
162
V
dc ±0.02
V
dc.
w.
While
observing the
DVM.
set
the
AC
Calibrator
for
output of
1.5,
2.0. 2,5.
and
3
volts.
The
DVM
should
indicate 3.162
V
dc
+0.04
V
dc
for
each
setting.
x.
Set the
339A
LINE
switch
to
OFF.
Remove
the
test
jumper
and
DVM
leads.
e.
Verify that the
counter
reads 100
kHz ±1
kHz.
If
not, readjust
A1C7
until
both
the 10
kHz
and
100
kHz
readings are within the
specified
limits.
5-16.
ANALYZER ADJUSTMENTS.
5-17.
Notch
Filter
Null Adjust.
Equipment
Required:
Spectrum
Analzyer
(
hp-
Model
3044A)
Low
Distortion Oscillator (-hp-
Model
339
A)
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