Fluke 8050A - Page 37

THEORY OF OPERATION
CIRCUIT DESCRIPTION
kr!,S
REFERENCE
VOLTAGE
(INPUT
DIVIDER)
V,mA
REFERENCE
VOLTAGE
(1V,VR1)
INTEGRATE
INPUT
FROM
SIGNAL
CONDITIONERS
AZ
A.AUTOZERO
SELECTABLE
GAIN
CIRCUIT
B.
INTEGRATE
AZ
C9
AND
INTEGRATOR
r-
- - -
-OVERRANGE
-----',...-
(OL)
SELECTABLE
GAIN
CIRCUIT
....._
_
__;,X"-'1..::.0_
LO
'-------'-'-X"'-1
-Lo
C9
RANGEAND
C.
READ
[DE(-R))
FOR
POSITIVE UNKNOWN INPUTS
3-4
kn,s
REFERENCE
VOLTAGE
I
I
I
\
\
/'
/
'
........
FUNCTION SWITCHES
DE
(+R)
I
/
\
I
I
,r:
-
- -
OVERRANGE
--~~-,..____
(OL)
I
I
I
DE
(-R)
(DE-R)
I
y-------
- -
........
-!_
/I
DE
(+R) DE(+R)
I
'\
(
~;+';\)':
\)
\
U20A U20B
I
'-
/I
'---------
Figure 3-2.
A/D
Converter
C9