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Model
339A
Section
IV
Table
4-7.
Distortion
Measurement Accuracy
Test.
Distortion
Frequency
Accuracy
Limits
10 Hz
+
1.0 dB, -2.0
dB
20 Hz
±1.0
dB
100 Hz
±1.0 dB
20
kHz
±1.0
dB
50
kHz
+1.0
dB,
-2.0
dB
100
kHz
+
1.5
dB,
-4.0
dB
330
kHz
+1.5
dB,
-4.0
dB
c.
Adjust
the
Synthesizer (3330B) controls
for
an
output frequency
of
1
kHz
and an
output amplitude
of
dBm.
d.
Set the
Low
Distortion Oscillator
for
an output
frequency
of
10
kHz. Adjust
the
output
level
for a
meter
indication of
1
V
on
the
339A
under
test.
e.
Set the
FUNCTION
switch of
the
339A
under
test
to
DISTORTION.
f.
Adjust
the
Synthesizer
amplitude
as
necessary
to
obtain
a distortion
reading of -80
dB
on
the
339A
under
test (full-scale
meter
indication).
g.
Set the
Spectrum Analyzer
(3571
A)
to a
3
Hz
bandwidth, an
input
range
of
+10
dB
V,
an
input
impedance
of
1
M
O
,
and
a
relative
display
reference.
Reference
the
Spectrum
Analyzer
to
the
339A
measurement
by
pressing the
Enter
Offset button.
h.
Set the Synthesizer to
each frequency
listed in
Table
4-7,
and
verify
that the
Spectrum
Analyzer
reading
is
within the
limits
listed.
4-25.
Residual
Noise
Test.
Equipment
Required:
1
k
L2
shielded load (Refer
to
Figure
4-12.)
a.
Set the
339A
controls as follows:
FUNCTION
DISTORTION
FILTERS
80
kHz
ON
(in)
DISTORTION
RANGE
-80
dB
INPUT
RANGE
IV
FREQUENCY
20
kHz
(2.0
x
10
K)
INPUT
GND
SELECT
DIS.
AN.
_L
(center position)
b.
Connect
the
1
kL2
shielded
load
to
the
DISTORTION
ANALYZER
input
terminals.
(See
Figure 4-12
for
construction
details
of
1
k
L2
load.)
c.
The 339A measurement
indication
must
be
below
-92
dB.
4-26. Input
Impedance
Test.
Equipment
Required:
Spectrum
Analyzer
(-hp-
Model
3044A)
100
k
£2
0.1%
Metal Film
Resistor (-hp- Part
No.
0698-4158)
No.
Description
-hp- Part No.
Connector,
male
1251-0174
Connector,
male
w/insulator
1251-0175
Lug, terminal
90°
0360-0042
Resistor,
1
kH,
1/BW,
1
%,
0757-0280
metal
flm
5
Washer,
int.
lock
2190-0007
6
Spacer,
6-32 threaded
0380-0058
7
Shield
1251-1073
8
Screw, pan
head,
6-32
x
1
/4
in.
2360-0113
Figure
4-12.
Shielded
Load
Assembly.
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