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4 Operating the Power System
Operating Mode Tutorial
Single-Quadrant Operation
Multi-Quadrant Operation
Keysight N679xA Load Module Operation
Single-Quadrant Operation
The Keysight N6700C Modular Power System can operate in either constant voltage (CV) or constant
current (CC) over the rated output voltage and current. Constant voltage mode is defined as an
operating mode in which the dc source maintains its output voltage at the programmed voltage
setting in spite of changes in load, line, or temperature. Thus, when the load resistance changes, the
output voltage remains constant while the output current changes to accommodate the change in
load.
Constant current mode is defined as an operating mode in which the dc source maintains its output
current at the programmed current limit in spite of changes in load, line, or temperature. Thus, when
the load resistance changes, the output current remains constant while the output voltage changes to
accommodate the change in load.
All DC power modules, except for Keysight Models N678xA SMU, are designed as constant voltage
sources. This means that the specifications and operating characteristics are optimized for constant
voltage mode operation. Note that these power modules cannot be programmed to operate in a
specific mode. At turn-on, the operating mode will be determined by the voltage setting, current
setting, and the load resistance. In the following figure, operating point 1 is defined by a fixed load line
traversing the positive operating quadrant in the constant voltage region. Operating point 2 is defined
by a fixed load line traversing the positive operating quadrant in the constant current region.
Keysight N6700C Series User's Guide
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