HP 339A - Analyzer Adjustments; Notch Filter Null and High Frequency Adjustment

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