HP 339A - Page 115

MANUAL CHANGES
Page 5
of
8
el
339A
Page 8-19/8-20, Figaro
8-18.
Add
R50,
R51,
C50.
and C51
to
the
schematic as
shown
in Figure
4.
This
change is to decouple power
supplies on
A2U1
to reduce
the
affect of internal oscillation on the 80kHz filter response. The
values
of
C
1 1
4,
C
1 1
5
and
C
1 1
6
are changed to compensate
for
the stray capacitance
in
the new 00339-26513 printed circuit
board. (See change
no.
1
3
for information on
Cl 1 4).
(affective oa
a*
serial nemiier
202SA022Z6
to 2025A02438)
Page 8-9, Table
8-3. Change the part
number of
A3U200
from
1
826-0109 to 1
826-0413.
«
(affective from
sorial
nombor
2025A02228
to 2025A02788)
_
i
6-7,
Table
6-3.
Change the part
number
and value
of
A3C205
from 0160-2264. 20pF to 0160-2200. 43pF
Page
8-1518-18,
Figaro
8-14. Change
the
value of
C205
from 20pF to
43pF
(effective on sorial number
202SA02438
to 2025A02786I
Pago 6-9. Table
6-3.
Change the
part
number
for A3U200 from
1826-0413
to
1826-0081.
(applies to all instruments)
(effective
on serial number 2025A02786 and above!
Pago 6-9, Table
6-3.
Change the part- number for A3U200
from
1826-0081 to
1826-0413.
Page 6-7, Table
6-3.
Change the part number and value of A3C205
from 0160
2200,
43pF to 0160-2198, 20pF
Page
8-1518-18, Figure
8-14. Change the
value of
C205
from 43pF to
20pF.
These
changes reduce noise
in the
Analyzer Mode
due
to
the
LM-31 8
Op
Amp. Meter
readings at 1kHz
with
a clean source
are
typically
-94dB.
With the
HA 2605
the meter typically
reads
-96dB.
CHANGE NO. 21
(applies to
all iastrumants)
(affective oa
sorial number
2022A02156
and abovol.
Pago
8-14, Table
8-3. Change
the part
numbers
for the following
miscellaneous parts:
MP9
from 00339-00603 to
00339-00613
MP1
0
from 00339-00601 to
00339-0061 1
MP1 1 from 00339-00602
to
00339-00612
MP1
4
from
00339-00604 to
00339-00614
MP1 5
from 00339-00605
to
00339-00615
(effactiva
on SN 1730A02158
and abovol
Pago 8-13, Table
6-3.
Add
part number 00339-23201,
Qty 5.
Coupler, Shaft.
CHANGE NO. 22
(applies
to ail instruments!
(effactiva
oa serial
number
2025A02296
and abovol.
Pago
6-4, Table
6-3. Change the
part number of
A1U2 from
1826-0315 to
1826-0557.
Page
6-6.
Table
8-3.
Change
the
part number of A2U8
from
1826-0315 to
1826-0557.
Page
6-7, Table
6-3. Delete all
information on A3J2.
Pago
6-10, Table
6-3. Change the
part number of A4U3, A4U5,
and
A4U6
from
1826-0315 to
1826-0557
(effoctivs
on serial
numbers
1730A02156
to 2025A03716!
Page
8-6,
Table
6-3.
Change
the part number
for
A2U1
from
1
826-031
5
to
1 826-0557.
The change of
1C
part numbers is to a
ceramic part to prevent
held
failures
due
to
phosphorus
contamination.
lapplias to
all
instruments)
(effoctivs
on
Serial
Numbar
2025A03716
and abovol
Pago 6-6,
Table
8-3.
Change
the part number of A2U1
from
1826-0557
to
1826-0323.
CHANGE NO. 23
(applies to all instruments)
leffective on serial
number
2025A02366
and above).
Pago
6-11.
Table
6-3.
Add part
number 00339-00616, "SHIELD,
PCB"
.
CHANGE NO. 24
(applies to
all instruments)
loffoctivs
on
serial
number 1730A02436 and
above).
Page
6-7,
Table
8-3. Change the part
number and value for A3F1
00
from 21
10-001
1,
062A to 21
10-0236,
1A.
Page
8-13/8-14,
Figure
8-13. Change
the value of F
1
00
from
062A
to
.
.1
A.