Keithley 3930A Service Manual page 24

SECI'ION 2
Principles of Operation
t COMPARATOR 1
*
\
I-L
FUNCTION
SELECTOR
SQUARE WAVE
__ XATOR
l-i- DUTY CYCLE
VARIABLE
I
7
r
MULTIPLIER
>
AM
AM ON/OFF
*
il5V max/OPEN
CONTROL
DATA
@we 2-2. Analog Selection Block Diagram
2-4