HP 3490A - Page 213

LOW FOR
+ REF INPUT
REFERENCE
POLARITY
LOCIC
cR8
4.75V
{
TOP
VrEW)
(HRAP)
RAT|O POL TO At
U40t
(27)
8
THRU
S,/H
OPTION
I8
WN NOTE
2
(H
IN
P)
INPUT
POL FROM AIU22(8J
7
HIGH FOR + INPUT
LOW FOR
-
INPUT
J6
I
:
FOR
INT
-t
I
w8
|
-ll
---------r6
AI
U30
at3
ut- 4
a
,'^'.
-.\-/.-
\Z
\Y
K-9
-REF
roJr(L)
l
INPUT
TO IIIVERTING
AMP
I
FROM
Jr
(9)
I
la
+
REF
SENSE
I ^---
rcorv
Jrlal
I
sEr NorE
3
+ REF
r0
Jt
(J)
)
INVERTING
AMPLIFIER
,
I
u3o!
->---t-
io':l-.1*1'
*5#3
R
5
Ratio
Figure
7-22.
Schematic Dagram, Reference
and
Circuits, A1, A13.
7431744
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