HP 3457A Service Manual page 218

P, 2
% A2/1
03457-66502
R111
ae if
1 \
'
1
' |
10K INPUT
AMPLIFIER
i !
}
r
+15V 0 +15V
4
'
|
113
Rii2
.c112 |
3 [10K 1000pF
'
:
\
'
\
f
|
U101
PRECHARGE
—$§<t¢
i
INPUT HYBRIO MPLIFIER
cri12| CR114 CR113
|
\
a
—
H
1
ADC Hi
R111
"10 M101
\ '
| W303
13) VAC
oe
H
' '
'
\
14 DAC
———
er
Figure 8-12. DC Offset Autocal Circuitry
8-55/8-56