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dfeel
339A
MANUAL CHANGES
Page
3
of
8
CHANGE
NO. 10
(applies to
aU
iastrumeats).
Pago
g-3,
TaWo
8-3.
Add
the following
list
of part
numbers
and
values
to
A1
C47*:
0160-0356
0160-2306
0160-0204
0160-0376
0140-0193
0140-0194
0140-0198
CAPACITOR-FXD
1
8pF
CAPACITOR-FXD
27pF
CAPACITOR-FXD
47pF
CAPACITOR-FXD
68pF
CAPACITOR-FXD
82pF
CAPACITOR-FXD
IIOpF
CAPACITOR-FXD 200pF
Note
that
the value
most
often
installed
by
the factory
will
be
200pF. The
other values are possible
alternatives.
Selection
of
this
value
will
optimize the high
frequency
I
>
1
00kHz)
distortion.
Page
8-21/8-22. Figar# 8-17.
Change
the value
listed
on
the
schematic
for
C47*
from
510pF
to
200pF.
CHANGE
NO.
11 laffacthra
aa
serial
numbers
1
730A01
1
82
ta
1
730A0
1
956).
*
6-9,
Table
8-3.
Add
A4C32*
and
the following
list
of part
aers
and
values:
0160-2248
0160-2249
0160-2250
0160-2251
0160-2252
CAPACITOR-FXD
4.3pF
CAPACITOR-FXD
4,7pF
CAPACITOR-FXD
5.
1
pF
CAPACITOR-FXD
5.6pF
CAPACITOR-FXD
6.2pF
Note
that the
value
most
often
installed
by
the factory
will
be
5.1pF.
The
other values are possible
alternatives.
Page
8-17, Figare 8-15.
Add
capacitor
C32*
in
parallel
with R2.
The
value
of
C32*
should
be
listed
as
5.1pF
This addition
will
provide
phase
shift at
1
1
0 kHz which
will
im-
prove
the
fundamental
rejection at that
frequency.
(applies to
ell
iastraaiaaUI
(effective
oe
serial
nambar
1730A01958
and above)
The
installed
value
for
C32*
is
6 2pF. Since
the
above
list
already
includes
this
value
a
schematic
change
is all
that
is
necessary
CHANGE
NO. 12
(applies to
all
instruments)
B
(effective
on
serial
number
1730A00598
and
above!.
Page
6-5.
Table
8-3.
Change
the
part
number
of
A2C23
from
01 80-1
746
to
01
80-2944. The
new
part
is
the
same
value but
has
a
leakage
specification
of
0
05 uA
maximum
(g)
14
VDC.
C23
is
used
to
slow
the
response
time
of
the
rms
detector
U5,
which
consequently slows
the
meter response
in
the
NORMAL
mode.
In
the
VU
mode
C23
is
switched
out
of
the
circuit.
If
the
dc
leakage through
C23
exceeds
05uA
a
dc
voltage
offset
occurs
at
pin
4
of
U5
causing an erroneous
meter
reading.
Page
8-7.
Table
8-3.
Change
the part
number
and
value
of
A3C324
from
0180-0374,
1
OuF
to
01
80-0374,
15uF.
Page
8-2318-24. Figure 8-18.
Change
the
schematic
value
of
C324
from
1
0uF
to
1
5uF.
Raising the value
of
this
capacitor
will
lower
the
ac
impedance
of
the
-15V power
supply
to
the
A2
board. This
will
improve
the
operation
of
the
80
kHz
filter.
CHANGE
NO.
13
(applies
to
all
instrumental
(affective
on
Serial
Number
1730AQ077S
and
aboval.
be
6-3,
Table
6-3.
Change
the part
number
and
value
of
A1C21
Im
0180-1745,
1.5uF
to
0180-0197,
2.2uF.
Page
8-21/8-22. Figure 8-17.
Change
the
schematic
value
of
C2
1
from
1
.OuF
to
2.2uF.
This
change
reduces
the
1
0Hz
ripple
in
the amplitude
control
cir-
cuits.
A
large
ripple
voltage
at
TP4
can cause
CR4
to turn
on
which causes harmonic
distortion.
Pigs
8-5,
Table
6-3.
Delete
all
information
on
A2C21
.
Page
B-19/8-20. Figure 8-16.
Delete
C21
from
the
schematic.
This
part
has
been
deleted
because
the
newer rms
detectors
(A2U5) do
not
require
its
use.
(effective
oa
serial
numbers
173QA0077B
to
2025A02646)
Page
8-4,
Table
6-3.
Change
the part
number
and
value
of
A2C13
from
0160-2244,
3pF
to
0160-2236,
IpF.
Page
8-19/8-20. Figure 8-18.
Change
the
schematic
value
of
Cl
3 from
3pF
to
1
pF.
This
change
has
come
about
to
increase the
bandwidth
of
A2U4.
The
old
rms
detector,
A2U5,
had
a
peak
in
the
response
at
1
1
0kHz
which compensated
for
the
reduced bandwidth
of
A2U4.
The
new
detectors
(marked
AD536AJ)
don't
have
this
peak
in
their
frequency response.
(applies to
all
instruments)
leffsctiva
on
serial
numbers
2025A02646
and above)
P*ga
6-4.
Toble
8-3.
Delete
all
information
on
reference designators
A2C1
1
and
A2C1
3.
Page
8-19/8-20. Figure 8-16.
Delete
schematic symbols,
values,
and
designators
for
Cl
1
and Cl
3.
(effective
on
serial
numbers
1730A00778
to
2025A02226)
Page
8-6.
Table
8-3.
Change
the
part
number
and
value
for
A3C1
1
4
from
0160-0363, 620pF
to
0160-2209,
360pF.
Page
8-13/8-14. Figure 8-13.
Change
the
schematic
value
of
Cl 14
from
620pF
to
360pF.
(applies to
all
instruments!
(effective
on
serial
number
2025A02226
and
aboval
Page
8-6,
Table
8-3.
Change
the
part
number
and
value
of
reference
designator
A3C114
from
0160-2209, 360
pF
to
0160-0341,
640pF.
Page
8-13/8-14
Figure
8-1 3.
Change
the
schematic
value
of
Cl
14
from
360pF
to
640pF.
CHANGE
NO. 14
(applies to
all
instruments)
(effective
on
serial
number
1730A00844
and
above).
Page
6-10.
Table
6-3.
Change
the
part
number
and
value
for
A4R48
and
A4R52
from
0698-4435,
2.49k0
to
0698-3515,
5.9kl2.
Pipe
8-17, Figure 8-15.
Change
the
schematic
values
of
R48
and
R52
from
2.49k«
to
5.9k«.
This
change
is
being
done
to
decrease
the
lock-in
time
of
the
notch.
Low
level
1
20Hz
line
signals
could beat with
the
fun-
damental
when
the
339
is
tuned
to
100Hz
causing
"out
of
specification" distortion
readings
at
100Hz.
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