HP 3490A - Page 224

6
-6V
FROM
CR4
I
R444
<
200K
i
6
+tzv
FROM
cR2
2a
_ -
-J
DISPLÄY
NOTE
2 WV
TO P2(5)
NC
OHMS REF
SELECT
L
(LOMR)
ro
R4t4
3
aND
J3(8)
13
XI ATTEN
REED
L
(LIR)
ro
R40l
XO.OI
ATTEN
REEO
L
(LOIR)
fo
R4l2
XI ATTEN
L
(LIA)
TO R409
XO.OI ATTEN
L
(LOIA)
TO
R403
LEAKAGE
CONTROL
L
(LLEC)
ro
R406
OVERLOAD
PROTECTION
H
(HOVP)
T0
R50l
+REF
SELECT
L
(LPRF)
ro
R420
-REF
SELECT
L
(LMRF)
TO R423
AC
INPUT
ENAELE
L
(LACI)
TO J2il4)
AC
CONV
OUTPUT
SWITCH
L
(LACO)
TO
R4t7
INPUT
SHORT
L
(LINS)
TO R426
(
r_.lc
)
R445
tooK
POLARITY
a J8(J
)
t5
[--soue.e,."oloieftil-l
:(---'----).
f
-sarrPLE^1oLDörlöil-l
rl
: (
- -----
--
)z
NoTE 2 WT
[-soupr-Ezro-r-oirfr
'-l
r(--
--)r
XIO
GAIN
L
(LIOG)
TO
R438
XIOO
GAIN L
(LHNG)
TO R44l
XI GAIN
L
TO R435
Figure
7-25.
Schematic
Diagram,
DC
Switching
Logic,
I
A1.
)wer
Supplies,
A l,
(
t
I
I
.Rou
raotr
ro*aa
[-{Hrra)
FuNcrtoN
B H
16
cR REMoTE oss'Y
f
tnrmt
FuNcroN
A H
f
(HrRc)
RANGE
c
H
I
y
?aNG5
COUNTER
U2tl
(HIRB)
RANGE
I
H
I
L
(HIRA)
RANGE A
H
NOT€
2 WW
fs^-rLErHoLD;pi6il-l
llur
u40l
READ
ONLY
MEMORY
74917-50
7-s1l'1
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