Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual
Section 3: Functions and features
077114601 / March 2019
3-57
Battery discharging test
As shown in the following figure, discharging is divided into two parts.
Figure 98: Discharging phases
Constant current phase:
In the initial stage, the instrument discharges the battery in constant
current mode. The absorbed current cannot be set, but it is usually the maximum current that can
be absorbed, which is approximately 1 A (influenced by the ambient temperature). The output
voltage is larger than V
set
but decreasing.
Constant voltage phase:
When the discharging voltage falls to V
set
, the instrument discharges
the battery in constant voltage mode while the discharging current is decreasing gradually.
If the maximum output current of the battery under test is less than 1 A, you should connect a
resistor between the instrument and the battery to prevent the battery from switching into
protection mode or being damaged.
When the discharging current falls to near 0, discharging is finished. At this time, the battery open
voltage equals V
set
.
