HP 339A - Filter Accuracy Check

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