B&K Precision 1747 - Manual - Manual (Page 15)

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6. Increase the coarse and fine current control setting until the desired constant
current value is read on the display, or set the current limit in advance (before
connecting the load) as described earlier in the Setting Current Limit procedure.
7. If the load current drops below the constant current value, the CC indicator will go
off and the CV indicator will light. In this case, the power supply automatically
switches to the constant voltage mode, and further rotation of the current
controls will not increase the output current.
Figure 6 - Typical Constant Current Operation
4.5 Constant Voltage/Constant Current Characteristic
The working characteristic of this power supply is called a constant voltage/constant
current automatic crossover type. This permits continuous transition from constant
current to constant voltage modes in response to the load change. The intersection
of constant voltage and constant current modes is called the crossover point.
Figure
7 shows the relationship between this crossover point and the load.
For example, if the load is such that the power supply is operating in the constant
voltage mode, a regulated output voltage is provided. The output voltage remains