Figure 5-5 Loading Effects - Keithley 2500 User Manual

Models 2500 and 2502 User's Manual
Regardless of the load, current will never exceed the fixed compliance of 20mA.
Figure 5-5
Loading effects
Output
Current (I)
A. Normal bias source operation
20mA
Output
Current (I)
B. Bias source in compliance
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Current Limit
Load Line
20mA
10mA
Output Voltage (V)
I = V / R
= 10V/1kΩ
= 10mA
Current Limit
Load Line
Output Voltage (V)
V = I R
S M •
= (20mA) (400Ω)
= 8V
Operating
Point
Voltage Source
Load Line
10V
Operating
Point
Voltage Source
Load Line
8V 10V
Measurement Concepts 5-7