Keithley 2651A Reference Manual page 205

Section 4: Theory of operation
A: Normal I-source operation
B: I-source operation in voltage compliance
Programmed source value:
100 mA
Actual source value:
50 mA
C: I-source operation in power compliance
Programmed source value:
100 mA
Actual source value:
30 mA
4-8
Model 2651A High Power System SourceMeter® Instrument Reference Manual
Figure 72: Model 2651A I-source load considerations
Programmed source value:
100 mA
Actual source value:
100 mA
V-meter
(V
V = I • R
M S
= (100 mA) (50 Ω)
= 5 V
V-meter
(V
I = V / R
S M
= 10 V / 200 Ω
= 50 mA
V-meter
(V
I = V / R
S M
= 6 V / 200 Ω
= 30 mA
10 V V
Operating n
point
5 V V
)
M
100 mA 100 10 10
I-source
(I )
S
10 V
5 V
)
M
Operating
point
50 mA 100 mA
I-source
(I )
S
10 V
5 V
)
M
Operating t
point
50 mA 100 mA
I-source
(I )
S
Voltage
compliance
limit line
Power
compliance
limit line
Programmed current
source value line
0 0 mA
Voltage
compliance
limit line
Programmed current
source value line
Voltage
Power limited
compliance
voltage compliance
limit line
limit line
Power
X
compliance
limit line
Programmed current
source value line
2651A-901-01 Rev. A / March 2011