HP 339A - Page 46

ction
V
Model
339A
j.
Set the
FUNCTION
switch
of the
339A
under
test
to
INPUT
LEVEL.
k.
Adjust
the
output
of the
339A being
used
as a
source for
a
tnetcr
indication
of
0 dB
V,
l.
Return
the
339A under test
to
the
DISTORTION
FUNCTION.
The
null
depth
must be
>-100
dB.
If not
readjust
A4RI6and
A4R43
until
the
null depth
is> 100
dB at both
input
levels,
m. Set
the
FUNCTION
switch
of
the
339A under
test
to
INPUT
LEVEL
and
the
FREQUENCY
controls
fora
frequency
of
10 Hz
(1.0 x 10).
n. Set the
frequency
of
the
339A being
used
a signal
rce to
10
Hz ( 1.0
x
10). Adjust the
output level
for a
er
indication
of-lOdB V
on
the
instrument
under
test,
o.
Enter
an output
frequency
of
10
Hz and
a step
frequency
of
0.1
Hz into
the
3330B.
60
kO
1%
Metal
Film
Resistor
(-hp-
Pan
No
0698-5973)
a.
Connect
the equipment
as
shown in
Figure 5-2.
b. Set the
339A (under lest)
controls
as follows:
FUNCTION
DISTORTION
FILTERS
OFF
(out)
METER
RESPONSE
NORMAL
DISTORTION
RANGE...,
.
,-80dB
INPUT
RANGE
IV
INPUT,
GND
SELECT....
DIS.
AN.
x
[center
position)
FREQUENCY
IU
kHz
(1.0 x 10
K>
OSCILLATOR
LEVEL
OFF
c.
Adjust
the
339A
being used
as a
signal
source
to
provide
a
10
kHz.
I
V
signal.
d.
Set
the
3571 A
Tracking
Spectrum
Analyzer
controls
as
follows:
p
Set
the
Bandwidth
of
the
3571 A
to
3
Hz.
q.
Step
the
Synthesizer
frequency
up or
down as
necessary
to
obtain
a peak reading
on
the
357
1 A.
r.
Press the
357IA
ENTER
OFFSET
button
and
observe
a
display
reading
of
00.00
dB
V.
s.
Enter the
frequency
displayed
on the
Synthesizer
as
the
step
frequency.
5tep the
frequency
of the
Synthesizer
to the
second
harmonic
of the
original
frequency
(one
step).
C Set
the
FUNCTION
switch
ofthe339A
under
test
to
DISTORTION
Adjust
A4R65
(INPUT
BALANCE
ADJUST)
for
a
minimum
reading on
Lhe
357
1
A
(Greatest
negative
reading.)
5*18.
High
Frequency
Adjustment.
Equipment
Required:
Spectrum
Analyzer
(-hp-
Model
3044A)
Low
Distortion
Oscillator
(-hp-
Model
339A)
600
D
1% Metal
Film
Resistor
(-hp- Part
No.
0698-5405}
DISPLAY
REFERENCE
....
RELATIVE
DISPLAY
SMOOTHING
ON
BANDWIDTH
3 Hz
INPUT
RANGE
HO dB V
INPUT
IMPEDANCE
|
VIII
e. Set
the
3330
B Automaiic
Synthesizer
controls
as
follows:
LEVELING
SLOW
TIME,
STEP
3000
mSec.
Enter an
output
frequency
of I k
Hz,
an
output
ampltiude
of
-40
dBm,
and
an
amplitude step
level uf.
I dBm
t, Step
the
3330B
amplitude
until
the
339A under
test
indicates
a distortion
reading
of
-80
dB V
g.
Press
the
357IA
ENTER
OFFSET
button
and
observe
a
display reading
of
OO.Ofl
dB
h. Enter
an
output
frequency
of
20 kHz
into
the
3330B
i.
Adjust A3CIS
(HIGH
FREQUENCY
ADJUST)
fora
3571 A
display
reading
of
-0.3
dB
F
0.1
dB.