Keithley 224 - Page 35

- . 7-T SERIAL TO PARALLEL
RANGE RES’SToR -j-&E
SHIFT/STORE REGISTER
I
I I I__-- ____ -----___---__-_--_ --- -- -.
I I I
OUTPUT
6 I
CONTROL
I
I
0 I I 1
I
OUTPUT
(TRIAXIAL RECEPTACLE)
POWER SUPPLY
9 ”
+!3J
DIGITAL
COMMON
I
ELECTROMETER
OP-AMP
DIGITAL
CONTROL
----1 --=-< GUARD
< OUTPUT COMMON
!
CHASSIS GROUND
Figure 4-1. Analog Circuitry Block Diagram