Keithley 2500

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