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Section 4: Theory of operation
A: Normal V-source operation
B: V-source operation in current compliance
Programmed source value:
10 V
Actual source value:
8 V
C: V-source operation in power compliance
Programmed source value:
10 V
Actual source value:
4.8 V
4-12
Model 2651A High Power System SourceMeter® Instrument Reference Manual
Figure 75: Model 2651A V-source load considerations
Programmed source value:
10 V
Actual source value:
10 V
I-meter
(I
M
I
=
V
/ R
M
S
= 10 V / 2 kΩ
= 5 mA
I-meter
(I
M
V
= I
• R
S
M
= (10mA)(800 Ω)
= 8 V
I-meter
(I
)
M
V
= I
• R
S
M
= (6 mA)(800 Ω)
= 4.8 V
10 mA
)
5 mA
5 V
V source
V
V-source
(V
)
S
10 mA
5 mA
)
5 V
V-source
(V
)
S
10 mA
5 mA
Operating
point
5 V
I-source
(I
)
S
Current
compliance
limit line
Power
compliance
limit line
Operating
point
Programmed voltage
source value line
10 V
Current
compliance
limit line
Operating
point
Programmed voltage
source value line
10 V
Current
Power limited
compliance
limit line
current compliance
limit line
Power
X
compliance
limit line
Programmed voltage
source value line
10 V
2651A-901-01 Rev. A / March 2011
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