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8
of
8
MANUAL CHANGES
Model
339A
Paragraph 5-17a
should
read,
'
Sat
the
frequency
of
the
239A
to
10Hz
(1.0
x
10).
Adjust the output
level for a
full
scale
meter
in-
dication
on
the
instrument under
test.'
Paragraph 5-17a
should
have added
to
the
end
of
it,
'This reading
must
be >-9JdB.'
Paragraph
5-18.
Under
Equipment
Required,
Low
Distortion
Oscillator,
(-hp-Model
339A)
should read
'(-hp-
Model 239A)'.
Paragraph 5-18e
should
read,
'
Adjust the
239A
signal
source
to
pro-
vide
a
10kHz,
IV
signal.'
Page
5-715-8.
Figsre
5-3.
Switch
the
part
designators
and adjustment
descriptions
on
A2R37
and
A2R1
7
shown
in
the
lower
left
corner
of
the
drawing.
CHANGE
NO. 39
(effective
on
serial
numbers
2025A04006
thru
2025A04160)
Page
6-7,
Table
6-3.
Change
the
part
number
of
A3Q100
from
J^-0458
to
1855-0269.
This
change
was made
because
the
vendor
discontinued the
part.
CHANGE
NO.
40
(applies to
ail
instruments!
(effective
on
serial
numbers
2025A04161
and above)
Page
6-7,
Table
6-3.
Change
the
part
number
of
A3Q100
from
1855-0269
to
1855-0230.
Page
4-8,
Table
4-5.
Change
the
table
to
read as below.
339A
Frequency
THD
Specification
10 Hz
100 Hz
1
kHz
10 kHz
20 kHz
30 kHz
50 kHz
80 kHz
109 kHz
<
-93
dB
<
-93
dB
<
-93
dB
<
-93
dB
<
-
93 dB
<
-85
dB
<
-80
dB
<
-
70 dB
<
-65
dB
Note:
The change
to
this
table
reflects
the
specification
change
and
a
change
in
relative
symbols which
was
an
error
in
the
original
manuscript
(-94
dB
is
less
than, not >,
-93
dB).
Page
4-10, Table
4-6.
Change
all
"greater
than"
signs
to
"<'
•
(See note above.)
Page
4-15.
Performance
Test Record.
Oscillator Total
Harmonic
Distortion Test:.
Change
the
table to
read as
below:
This
shange
was made
because
the
input
circuit
has
Detter
distor-
tion
performance
with
a
depletion
mode MOSFET.
This part
should
be used
in
all
instruments.
Page
6-5.
Table
6-3.
Change
the
part
number
and
value
of
A2R1
6
from
0757-0422.
909
ohms
to
0757-0420. 750 ohms. Change
the part
number
and
value
of
A2R1
7
from
2100-321
2.
200 ohms
to
2100-0554,
500
ohms.
Page
8-19/8-20.
Figure
8-16.
Change
the
schematic
value
of
R
1
6
from
909
to
750
and
that
of
R17
from
200
to
500.
This
change
was made
to
give control over
a larger
percentage
of
full
scale deflection
of
the meter. This allows
meters
to
be used
from
the
full
range
of
the
meter
specification.
NGE
NO. 41
(applies to
all
instruments)
Page
6-5.
Table
6-3.
Under
A2K1
.
change
HOLD
DOWN
SPRING
1460-1581
to
RELAY HIDDNSP
1460-1612.
Page
1-3.
Table
1-1
In
the
OSCILLATOR
section
under
Distortion,
change
the
table of
specifications
to
read as
below.
10
Hz
to
20 kHz
20 kHz
to
30 kHz
30 kHz
to
50 kHz
50 kHz
to
80 kHz
80
kHz
to
110 kHz
<
-93
dB
!0.0022%)THD
<
-85
dB
(0.0056%)THD
<
-80
dB
(0.01
%ITHD
<
-
70 dB
(0.032%ITHD
<
-65
dB (0.056%)THD
339A
Output
Frequency
Calculated
THD
Test
j
Limit
|
10
Hz
-93
dB
100 Hz
-93
dB
!
1
kHz
-93
dB
10 kHz
-93
dB
i
20 kHz
93 cB
1
30 kHz
-85
dB
50 kHz
—
-80
dB
80 kHz
-70
dB
109 kHz
—
-65
dB
I
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