'M&
—
UU-f-lw
A15
Rav.
B & C
(Icutrumant Serial No's 1622A00906 and greater)
0S45S-66515
Re«. A
(Instrument Serial
No's 1622100905 and below.)
Aa
Ad
A
A
Ag
Ah
A|
Aj
C37, C38 and H97 have been added
and the
value
of A15R59 has beer' changed from 10 kn
to
100
kn
to eliminate transients during autoH'angIng which causa inaccurate "first" readings.
(Instrument Serial No's 1622A00906 and greater.)
R89 has been mads a "selected" value to improve the accuracy at 1 MHz. (Instrument Serial
No's 1622A00101
and greater.)
C36 and
R96 have
been added to reduce
offset
at elevated temperatures, (instrument Serial
No's 1622A00906 and greater.)
Relay
K3
has been changed
to a
different type
to
prevent arcing
during auto-ranging when
1000 V is applied to the input. (Instrument Serial No's 1622A00906
and greater.)
The values of potentiometers R72 and R75 have been decreased to improve the temperature
stability of the input
amplifier
circuity.
The
value
of resistors R81 and R8S
have been increased
to center the pots. Previous values were: R72, 200; R75, 2 K; R81, 5.1 1 K;
R85, 562. These
changes have been made on instrument with Serial No's 1622A00906 and greater.
The following
component
changes
have been made to improve the down-scale linearity of the
RMS converter: R17; from
2
kn to
5
kn. R23; from
68
kn to 100 kn. R25;
from 25 kn to
100 kn. R51; from 100 n to 200 n. R52; from 10 kn to 20 kn.
R53:
from
5
kn
to 10
kn.
These changes have been made on instruments with Serial No's 1 622A051 1 and greater.
Serial numbers 1622A01000 and above. Replaces
0757-0417
(562 Q) to Increase the
zero ad-
justment range.
Serial numbers 1622A01806
and
above replaces 5080-9080.
The new part Is not hand-selected.
Serial numbers 1622A01656
and
above
replaces
R36: 0698-4450
(324 O) and R95: 0757-0407
(200
n).
R95 provides improved
dc compensation. R36 essentially improves temperature
sta-
bility.
Serial numbers 1622A02256 and above. Added as
ac bypass of CR3.
Al
Serial numbers 1622A01956
and
above. Replaces 0757-0486
(825 K) to Increase the offset
adjustment range.
Am
Serial
numbers 1522A01206 and
above the fallowing component
changes were made to im-
prove Input amplifier temperature stability:
Old Part No.
R81:
0698-3382
(5490)
R82:
0698-4308
(16.9 K)
R83 : 0698-4429
(1870)
R85: 0698-4459 (634)
R71 : See padding list as per Table
6-1.
A|sj Serial numbers 1622A03136 and
above. Improved specifications
on U3
and
U1
make the ex-
panded offset
adjustment range
no
longer required. R18 and R31 were changed from part
number 0698-4540 (412 K) to 732 K to reduce this range and
improve
stability.
^0
R66 was
changed from 200 K
(0683-2045) to 16 K
(0683-16351 to
improve the first
reading
after switchirtg
from
the
10V range to
the 1
00
V range.
C33 was
changed from
.1
*iF (01 60-3581
)
to .22
/iF (0160-3966)
to improve accuracy
at
30 Hz.
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