Battery Charging And Discharging - Tektronix Keithley 2281 Series Reference Manual

Section 3: Functions and features Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual

Battery charging and discharging

When the 2281S is in the battery test function, the instrument and the battery under test can be
connected in two-wire sense or in four-wire sense. However, the four-wire sense connection, as
shown in the following figure, is recommended because it can cancel the wire resistance.
Figure 97: Four-wire connection to rear panel
Keithley recommends using a source-measure unit (SMU) with test-script capability (for example, the
Keithley Model 2450 or 2460) to control current sinking when building a discharge model of a battery.
Because the Series 2281 has limited sink capability and cannot control the amount of sink current, it
creates a discharge model based on charging a battery. As a result, it cannot create a unique
discharge model and cannot model a nonrechargeable battery.
Using a SMU with the Series 2281 allows you to create a model at a specific current. You can use
this current setting as the average current that the device will draw, resulting in a more realistic
model.
3-56 077114601 / March 2019