Datasheet Series 2281S Battery Simulator and PrecisionDC Power Supply The Series 2281S Battery Simulator and Precision DC Power Supply innovatively integrates battery simulation with the functions of a high-precision power supply. The 2281S-20-6 can analyze the DC current consumption of a device under test and generate a battery model based on a battery charging process, and simulate a battery based on a battery model. The 2281S-20-6 can output 120W with 20V and 6A, and sink current up to 1A. The 2281S uses linear regulation to ensure low-output noise and superior load current measurement sensitivity. A high resolution color thin film transistor (TFT) screen A Tektronix Company displays a wide range of information on measurements. Key Features Soft-key buttons and a navigation wheel combine with Simulate a batterys output during the charge and the TFT display to provide an easy-to-navigate user discharge cycles interface that accelerates instrument setup and operation. Create, edit, import, and export battery models In addition, built-in plotting functions allow monitoring Build a library of battery models using a Source trends such as drift. These features provide the flexibility Measure instrument as a model generator required for both benchtop and automated test system applications. In addition, the 2281S provides a list mode, Display the real-time change of the SOC, V , and V oc t for the simulated battery triggers, and other speed optimization functions to minimize test time in automated testing applications. Compute battery capacity in Amp-Hour and Equivalent Series Resistance (ESR) Program the battery SOC, Voc, capacity, and internal resistance (ESR) Provide two modes of simulationdynamic and static Monitor charge/discharge current and voltage Output up to 120 W of low noise, linear regulated power Monitor load currents from 100 nA to 6 A with high accuracy in power supply mode Figure 1. Series 2281S startup screen. Measure voltage and current with 6-digit resolution Sink current up to 1A and source current up to 6A Built-in graphing simplifies analyzing trends or displaying voltage or current waveforms High resolution TFT display and soft-key/icon-based user interface simplify operation Digital I/O for direct communication with other devices and instruments GPIB, USB, and LAN interfaces Emulation of front panel display and controls via your web browser simplifies automated control and Figure 2. Battery simulator home screen. monitoringDatasheet Battery Simulation Based on a Use a Source Measure Unit to Battery Model Discharge a Battery and Create a Battery Model In the battery simulator function of the 2281S, real battery output performance can be simulated based on a I selected battery model. State of charge (SOC) and voltage open circuit (Voc) can be set to any state to test a device- under-tests (DUTs) performance at various states of + the battery. There are two modes from which to choose: Static: During the static simulation, V and SOC oc stay the same. Use a Keithley 2450 or 2460 Series SMU with a model generating test Dynamic: During the dynamic simulation, V and SOC oc script to discharge batteries and create battery models for the 2281S-20-6 change according to charging and discharging as with Battery Simulator. a real battery. Capacity can also be reduced to accelerate the charging Determine SOC and ESR and and discharging process for better test efficiency. Create a Battery Model During Battery Testing In the 2281S battery test function, charge/discharge testing on a battery can be performed. Charging current ranges from 0 to 6A, and the maximum discharging current is 1A. During charging, the sampling interval can be set for the internal 6-digit multimeter to sample the charging current and voltage continuously. In this way, the capacity of the battery and its internal resistance (ESR value) are automatically computed. Figure 3. Plot of Voc and ESR as a function of State of Charge (SOC). After the test, a battery model can be generated based on the measurement result of the battery charging process. Battery Model Parameters A battery model can be edited, created, imported, or 101 (0% State of Charge to Points in Simulation exported in a CSV file format. 100%State of Charge) Simulated ESR Range 0 to 10 ohms Simulated ESR Resolution 1 milliohm Simulated ESR Offset 100 to 100 ohms Simulated Voc Range 0 to 20 Volts Simulated Voc Resolution 1 mV Simulated Capacity Range 1 mAh to 99 Ah Simulated Capacity Resolution 1 mAh Figure 4. Battery test display. 2 TEK.COM