Keithley 2651A Reference Manual page 207

Section 4: Theory of operation
The first graph in the figure (labeled "A: Output characteristics"), shows the output characteristics for
the V-source. As shown, the Model 2651A can continuously output up to 40.4 V at 5 A, up to 20.2 V
at 10 A, or up to 10.1 V at 20 A. Note that when continuously sourcing more than 10.1 V, current is
limited to 10 A and when continuously sourcing more than 20.2 V, current is limited to 5 A.
The second graph in the figure (labeled "B: Limit lines"), shows the limit lines for the V-source. The
voltage source limit line represents the maximum source value possible for the presently selected
voltage source range. For example, if you are using the 20 V source range, the voltage source limit
line is at 20.2 V. The current compliance limit line represents the actual compliance in effect (see
Compliance principles
limits of the High Power System SourceMeter
operating point can be anywhere inside (or on) these limit lines. The limit line boundaries for the other
quadrants are similar.
4-10
Model 2651A High Power System SourceMeter® Instrument Reference Manual
Figure 74: Model 2651A V-source boundaries
Limit I
20 A
10 A
5 A
10.1 V 20.2 V
A: Output characteristics
compliance
limit line
I-measure
V-source
B: Limit lines
(on page 4-2)). These limit lines are boundaries that represent the operating
®
Source V
40.4 V
Current
Voltage source
limit line
Instrument for this quadrant of operation. The
2651A-901-01 Rev. A / March 2011