Section 4: Theory of operation Model 2657A High Power System SourceMeter® Instrument Reference Manual
4-6 2657A-901-01 Rev. B/December 2012
Figure 70: Model 2657A V-source boundaries
The first graph in the figure (labeled "A: Output characteristics"), shows the output characteristics for
the V-source. As shown, the Model 2657A can continuously output up to 3.0 kV at 20 mA or up to 1.5
kV at 120 mA.
The second graph in the figure (labeled "B: Limit lines"), shows the operating area of the V source on
a given range. The maximum voltage source value line shows the maximum possible source voltage
for the selected voltage range. For example, if you are using the 1500 V source range, the maximum
voltage source value line is at 1515 V. The current compliance limit line represents the actual
compliance limit in effect (see Compliance limit principles
on page 4-2). The lines drawn are
boundaries that represent the operating limits of the High Power System SourceMeter
®
instrument for
this quadrant of operation. The operating point can be anywhere inside (or on) these lines. The
boundaries for the other quadrants are similar with respect to the Continuous power operating
boundaries (on page 4-4).
I-measure
A: Output characteristics
B: Limit lines
V-source
Current
compliance
limit line
Source V
Limit I
120 mA
20 mA
1.5 kV 3.0 kV
Maximum voltage
source value line
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