Occasionally, an active load may pass a reverse current to the power supply.

To avoid reverse current loads, use a bleed-off load to preload the output of the device. Ideally, a bleed-off load should draw the same amount of current from the device that an active load may pass to the power supply.

Caution Power supplies not designed for four-quadrant operation may become damaged if reverse currents are applied to their output terminals. Reverse currents can cause the device to move into an unregulated mode and can damage the instrument. Refer to the PXIe-4150 Specifications for more information about channel capabilities.
Note The sum of the bleed-off load current and the current supplied to the load must be less than the maximum current of the instrument.