![background image](http://html1.mh-extra.com/html/keithley/2651a/2651a_reference-manual_661729209.webp)
Section 4: Theory of operation
Model 2651A High Power System SourceMeter® Instrument Reference Manual
4-12
2651A-901-01 Rev. A / March 2011
Figure 75: Model 2651A V-source load considerations
V-source
(V
S
)
V source
V
I-meter
(I
M
)
V-source
(V
S
)
I-meter
(I
M
)
Operating
point
2 k
Ω
DUT
Loa
d Line
(R)
Current
compliance
limit line
Operating
point
I
M
=
V
S
/ R
= 10 V / 2 k
Ω
=
5 mA
V
S
=
I
M
• R
=
(10mA)(800
Ω)
=
8 V
80
0
Ω
DUT Lo
ad Lin
e (R
)
Programmed voltage
source value line
Programmed voltage
source value line
Power
compliance
limit line
a
R)
ne
T
L
Current
compliance
limit line
A: Normal V-source operation
Programmed source value:
10
V
Actual source value:
10
V
B: V-source operation in current compliance
Programmed source value:
10
V
Actual source value:
8
V
Current
compliance
limit line
Power
compliance
limit line
C: V-source operation in power compliance
Programmed source value:
10
V
Actual source value:
4.8
V
Programmed voltage
source value line
I-meter
(I
M
)
5 mA
10 mA
10 V
5 V
5 mA
10 mA
10 V
5 V
5 mA
10 mA
10 V
5 V
I-source
(I
S
)
Power limited
current compliance
limit line
Operating
point
V
S
=
I
M
• R
= (6 mA)(800
Ω)
=
4.8 V
80
0
Ω
DUT Lo
ad Lin
e (R
)
X