Keithley 172A Instruction Manual page 58

THEORY OF OPERATION
INSTRUCTION MANUAL
DigItal Mulllmeter
Models ,c?A. 173A
F501 RANGE
RANGE
3A
HI
-r
IN
INPUT
PROTECTION
.v
R5o7, R508,
R509
R510, R5l I,
.I R512
0 LO
FIGURE 5-5.
Simplified Schematic of 173A I/V Converter.
I
F501
2A 2A
IN IN
OUTPUT OUTPUT
FIGURE 5-6.
Simplified Schematic of Model l72A I/V Converter.
5-8