B&K Precision 1651A - Manual - Manual (Page 21)

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__________________________________________________________________________OPERATING INSTRUCTIONS
Figure 5. Setting Current limit.
Figure 6. Typical constant current operation.
7. Increase the 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 prescribed earlier
in the “Setting Current Limit” procedure.
8. If the load current drops below the constant current value,
the CONSTANT CURRENT indicator will go off. In this
case, the power supply automatically switches to the constant
voltage mode, and further rotation of the CURRENT control
will not increase the output current.