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r
lodel
339A
Secnon
V
SPECTRUM ANLAYZ6R
•hp-
MODEL
3044
A
LOW
DISTORTION
OSCILLATOR
hp-
M006L
239A
OSCILLATOR
OUTPUT
distortion
MEASUREVtNT
SET
-hp-
MODEL
339A
300
(1
LOAD
-hp
1
1035
A
MONITOR
OUTPUT
DISTORTION
ANALYZER
INPUT
Figure
5-1.
Notch
Filter
Null
Adjustments.
a
Connect
the
equipment
as
shown
in
Figure
5-1.
LEVELING
.....FAST
TIME.
STEP
1000
in
See
b
Set the
339A
(under
test)
controls
as follows:
FUNCTION
INPUT LEVEL
•
FILTERS
OFF
(nut)
METER RESPONSE
NORMAL
DISTORTION
RANGE
-80
dB
INPUT
RANGE
3V
INPUT/GND SELECT
....
DIS
AN./X
(center position)
FREQUENCY
I
kHz
(1.0 x
I
K>
c.
Set
the
controls
of
the
339A
being used
as
a
signal
source
to
obtain a
I
kHz
(1.0 x
I
K)
signal.
Adjust
the
output
level
for
a meter
indication of -10
dB V
on
the
instrument
under
test.
d.
Set
the
3571
A
Tracking
Spectrum
Analyzer
controls
as follows:
DISPLAY
REFERENCE
RELATIVE
DISPLAY
SMOOTHING
ON
BANDWIDTH
30
Hz
INPUT
RANGE
+
10
(dB
V)
INPUT
IMPEDANCE.
I
Mfi
Set the
3330B Automatic
Synthesizer controls
as
follows:
Enter
an output frequenev
of
l
kHz
and
a step
frequency
of
I
Hz.
f.
Step
the synthesizer
up
or
down
as necessary
to
obtain
a
peak
reading
on
the 3571
A,
g
Press the
357
1
A
Enter
Offset
switch
and
observe a
display reading of
00
00
dB
V
h.
Set the
FUNCTION
switch of the
339A
under
test
to
DISTORTION.
i.
Adjust
A4RI6
(NOTCH
FILTER
NULL
AD-
JUST)
and
A4R43
(NOTCH
FILTER
FREQUENCY
ADJUST)
for
maximum
null (greatest
negative reading)
as indicated
by
the
3571 A.
The
null
depth
must
bc>-100
dB
Null
depth
is
determined by adding
the
339A
DISTORTION
RANGE
setting (-80
dB) and
the
3571
A
display reading.
NOTE
The adjustment
of
A4R16
and
A4R43
interact.
Repeat
the
adjustment
of
A4R16
and
A4R4}
until
the
maximum
null
u
obtained.
5-3
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