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Section
III
a.
Set the
FILTER
switches
off (out),
the
METER
RESPONSE
switch
to
NORMAL,
and
the
INPUT/
GND
SELECT
switch
to
the
center
position.
(Distortion
ANalyzer
with
input
low connected
to
chassis
ground.)
b.
Set the
FUNCTION
switch
to
INPUT
LEVEL.
c.
Set the
INPUT
RANGE
control
to
the
10 volt
range.
d.
Set the
FREQUENCY
controls
fora frequency
of
1
kHz.
e.
Set the
OSCILLATOR LEVEL
control
to the 3 volt
range.
f.
Connect
a
cable
from
the
OSCILLATOR
OUTPUT
terminals
to
the
DISTORTION
ANALYZER
mmif
fArminolc
mpul
iwt iiiiiiuio.
g.
Adjust
the
OSCILLATOR LEVEL
vernier
for a
meter
indication of 6
volts.
h.
While observing
the meter,
set
the
INPUT
RANGE
control
to
the
30,
100,
and
300
volts
ranges.
The
meter
should
indicate
6 volts
on
the respective ranges.
The
left
hand
INPUT
RANGE
indicator
light
should be
lit
on
all
three ranges.
i.
Set the
INPUT
RANGE
switch
to
the
3
volt
range.
Observe
that the right
hand
INPUT
RANGE
indicator
is
lit.
j.
Down-range
the
OSCILLATOR LEVEL
control
to
the next
lower range
and
adjust the
level
vernier
for a
meter
indication -10
dB
V.
k.
Down-range
the
INPUT
RANGE
control
to the
next lower range.
The
meter should
indicate 0
dB V ±
.2
dB
V.
l.
Repeat
Steps
j
and
k
until
all
input ranges except
the
.001
V
range
have been checked.
m.
Set the
INPUT
RANGE
control
to
the
10 volt
range
and
the
OSCILLATOR LEVEL
control
to
the
3
volt
range.
n.
Adjust
the
level
vernier for a
meter
indication of
-
12
dB
V.
o.
Set the
FUNCTION
switch
to the
RELATIVE
LEVEL
position.
p.
Vary
the
RELATIVE ADJUST
control
to verify
an
adjustment range
of
greater-than
10
dB
V.
3-52. Distortion
Analyzer.
3-53.
The
following
procedure checks
the distortion
Model
339A
analyzer ranges
and
distortion
measurement
capability.
Perform
the
following
steps:
a.
Set the
FILTER
switches
off (out), the
METER
RESPONSE
switch
to
NORMAL,
and
the
INPUT/
GND
SELECT
switch
to
the center position (Distortion
ANalyzer
with input
low connected
to chassis ground).
b.
Set the
DISTORTION
RANGE
control
to 0
dB.
c.
Set the
INPUT
RANGE
control
to the
1
volt range.
d.
Set the
FREQUENCY
controls
to
a frequency of
1
kHz.
e.
Set the
OSCILLATOR LEVEL
control
to
the
3 volt
range.
f.
Connect
a
cable
between
the
OSCILLATOR
OUTPUT
terminals
and
the
DISTORTION
ANALY-
ZER
input terminals.
g.
Set the
FUNCTION
switch
to
the
DISTORTION
position.
h.
Adjust
the
OSCILLATOR LEVEL
vernier for
a
meter
indication of
-15
dB
V.
i.
Down-range
the
DISTORTION RANGE
control
to
the
next lower
range.
The
meter
should
indicate
approximately
-5
dB
V.
j.
Repeat
Steps h
and
i
until
all
distortion ranges have
been checked.
3-54.
Filters.
3-55.
The
following
procedure checks
the
"roll-off'
of
the
filters.
a.
Set the
FUNCTION
switch
to
OSCILLATOR
LEVEL.
b.
Set the
INPUT
RANGE
control
to
the
3 volt
range.
c.
Set the
OSCILLATOR LEVEL
control
to
the
3 volt
range
and
adjust the
level
vernier
for a
meter
indication of
OdBV.
d.
Set the
FREQUENCY
controls
for a frequency
of
400
Hz.
e.
Set the
400
Hz
FILTER
switch
on
(in).
The
meter
should
indicate
-3
d
B
V
±
1
d
B.
Return
the
filter
switch
to
off
(out).
f.
Set the
FREQUENCY
controls
for a
frequency
of
30
kHz. Readjust
the
level
vernierfora meter
indication 0
dB V
if
necessary.
g.
Set the
30
kHz
filter
switch
on
(in).
The
meter
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