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Model 339
A
Section
IV
Table
4-4.
Oscillator
Frequency Accuracy
Test.
Frequency
339A
Frequency
Range
Setting
Frequency Counter
Indication (Period)
10 Hz
102.04 mSec.
-
98.04 mSec.
20
Hz
X
10
51
.020
mSec.
-
49.01 9
mSec.
50
Hz
20.408 mSec.
- 1
9.608 mSec.
100
Hz
10.204 mSec.
-
9.803
mSec.
100
Hz
10.204 mSec.
-
9.803 mSec.
200
Hz
X 100
5.1020 mSec.
-
4.9019 mSec.
500
Hz
2.0408 mSec.
-
1
.9608 mSec.
1
kHz
1
0204
mSec.
-
.9803
mSec.
J^kHz
1020.4
MSec.
-
980.3
MSec.
kHz
927.64
M Sec.
-
891.26
MSec.
1
,2
kHz
850.34
MSec.
-
816.99
MSec.
1
.3
kHz
784.93
MSec.
-
754.14
M Sec.
1
.4
kHz
728.86
MSec.
-
700.28
MSec.
1.5
kHz
680.27
MSec.
-
653.59
m
S
ec
.
1.6
kHz
637.75
MSec.
-
612.74 M
Sec.
1
.7
kHz
600.24
jxSec.
-
576.70
/-tSec.
1.8
kHz
X IK
566.89
MSec.
-
544.66
MSec.
1
.9
kHz
537.05
MSec.
-
51
5.99 m
S
ec.
2.0
kHz
510.20
M Sec.
-
490.19
MSec.
3.0
kHz
340.13
M
Sec.
-
326.79
MSec.
4.0
kHz
255.10
M
Sec.
-
245.09
MSec.
5.0
kHz
204.08
MSec.
-
196.08
MSec.
6.0
kHz
170.06
MSec.
-
163.39
MSec.
7.0
kHz
145.77
MSec.
-
140.05
MSec.
8.0
kHz
127.55
MSec.
-
122.54
M Sec.
9.0
kHz
1
13.37 MSec.
-
108.93 M
Sec.
10.0
kHz
102.04
MSec.
-
98.039
MSec.
10 kHz
102.04
MSec.
-
98.039 M
Sec.
20
kHz
51.020
/xSec.
-
49.019
^Sec.
50
kHz
X
10 K
20.408
MSec.
-
19.608
MSec.
kHz
10.204
MSec.
-
9.8039
MSec.
^£9
kHz
9.361
5
MSec.
8.9944
MSec.
b.
Connect
the
equipment
as
shown
in
Figure
4-7.
c.
Adjust
the
Frequency Counter
controls
to
measure
period.
d.
The 339A
10
Hz
frequency should be
within
the
limits
listed
in
Table
4-4.
e.
Verify the
339A
Oscillator
Frequency Accuracy
for
each frequency
listed in
Table
4-4.
4-19. Oscillator
Total
Harmonic
Distortion
Test.
Equipment
Required:
^Spectrum Analyzer
(-hp-
Model
3044A)
^Tuneable
Notch
Filter
(-hp-
Model
339A)
600
ohm
Resistive
Load
(-hp-
1
1095A)
a.
Set the
339A
controls as follows:
FUNCTION
OSCillator
LEVEL
FREQUENCY
10
Hz
(1.0
x
10)
FREQUENCY
VERNIER
CAL
OSCILLATOR LEVEL
3
V
b.
Connect
the
equipment
as
shown
in
Figure
4-8.
c.
Adjust
the
339A
OSCILLATOR LEVEL
vernier
for
an
output
level
of
3
V
rms
as
indicated
on
the
339A
meter.
d.
Set
the
Tuneable Notch
Filter
(339A) Frequency
to
10
Hz
and
set
the
Function
to
Input
Level.
Adjust
the
Input
Range
control
as
necessary
to
obtain
an
on-scale
meter
indication
as
near
full-scale
as possible.
e.
Set the
Spectrum
Analyzer
(3571
A)
controls
for
an
input
impedance
of
1
M
f2
,
an
input range of
+
10dB
V,
a
bandwidth
of
3
Hz.
and
a
relative
display
reference.
f.
Tune
the
Spectrum
Analyzer
to
the exact
frequency
of
the
339A
under
test
by
varying
the
Synthesizer
(3330B)
frequency
until
the
Spectrum
Analyzer
indicates
maximum
level.
Enter
this
frequency
as
both
the
output
frequency
and
step
frequency
of the Synthesizer.
g.
Reference
the
Spectrum
Analyzer
to the
amplitude
of
the
339
A
fundamental
frequency by
pressing the
Enter
Offset button.
(Observe
a
Spectrum
Analyzer
display of
00.00 dB.)
h.
Adjust
the
Tuneable Notch
Filter
controls
as
necessary
to
make
a distortion
measurement. (The
purpose
of
this
step
is
to null
the
fundamental
frequency
of
the
339A
Oscillator output.
This puts
the distortion
products
within
the
dynamic
range
of the
Spectrum
Analyzer.)
i.
Step
the
Synthesizer
frequency
to
the
second
harmonic
frequency
of the
339A
output.
j.
The
amplitude
of the
second
harmonic
frequency,
relative to
the
fundamental frequency
is
determined by
adding
the
Spectrum
Analyzer
display reading
and
the
range
setting
of
the
Notch
Filter.
(As an example:
If
the
Notch
Filter
distortion
range control
is
set
to -80
dB
and
the
Spectrum
Analyzer
display indicates -23
dB
the
amplitude
of the
second
harmonic
is
-103 dB,
relative to
the
fundamental.)
Record
the
amplitude
reading
of the
second harmonic.
k.
Step
the Synthesizer
frequency
to the
frequency
of
the
third
harmonic.
l.
Determine
the
relative
amplitude
of
the
third
harmonic by adding
the
Spectrum
Analyzer
display
reading
and
the
range
setting
of the
Notch
Filter.
Record
the
amplitude reading
of the
third
harmonic.
4-7
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