Agilent Technologies E3631-90002, User Manual, Page: 148 / 166

Chapter 7 Tutorial
Connecting the Load
147
7
Reverse Current Loading
An active load connected to the supply may actually deliver a reverse
current to the supply during a portion of its operating cycle. An external
source can not be allowed to pump current into the supply without risking
loss of regulation and possible damage. These effects can be avoided by
preloading the output with a dummy load resistor. The dummy load resistor
should draw at least the same amount of current from the supply as the
active load may deliver to the supply. The value of the current for the
dummy load plus the value of the current the load draws from the supply
must be less than the maximum current of the supply.