2281S-20-6

Datasheet Series 2281S Battery Simulator and Precision DC 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 120 W with 20 V and 6 A, and sink current up to 1 A. Key Features A Tektronix Company • Simulate a battery’s output during the charge and discharge cycles • Create, edit, import, and export battery models • Build a library of battery models using a Source Measure instrument as a model generator • Display the real-time change of the SOC, Voc, and Vt for the simulated battery • Compute battery capacity in Amp-Hour and Equivalent Series Resistance (ESR) 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 displays a wide range of information on measurements. Soft-key buttons and a navigation wheel combine with the TFT display to provide an easy-to-navigate user interface that accelerates instrument setup and operation. In addition, built-in plotting functions allow monitoring trends such as drift. These features provide the flexibility required for both benchtop and automated test system applications. In addition, the 2281S provides a list mode, triggers, and other speed optimization functions to minimize test time in automated testing applications. • Program the battery SOC, Voc, capacity, and internal resistance (ESR) • Provide two modes of simulation–dynamic 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 • Measure voltage and current with 6½-digit resolution Figure 1. Series 2281S startup screen. • Sink current up to 1 A and source current up to 6 A • 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 monitoring Figure 2. Battery simulator home screen. Datasheet Battery Simulation Based on a Battery Model In the battery simulator function of the 2281S, real battery output performance can be simulated based on a selected battery model. State of charge (SOC) and voltage open circuit (Voc) can be set to any state to test a deviceunder-test’s (DUT’s) performance at various states of the battery. There are two modes from which to choose: Use a Source Measure Unit to Discharge a Battery and Create a Battery Model I + – • Static: During the static simulation, Voc and SOC stay the same. • Dynamic: During the dynamic simulation, Voc and SOC change according to charging and discharging as with a real battery. Capacity can also be reduced to accelerate the charging and discharging process for better test efficiency. Use a Keithley 2450 or 2460 Series SMU with a model generating test script to discharge batteries and create battery models for the 2281S-20-6 Battery Simulator. Determine SOC and ESR and 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 6 A, and the maximum discharging current is 1 A. During charging, the sampling interval can be set for the internal 6½-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). Battery Model Parameters Points in Simulation 101 (0% State of Charge to 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 After the test, a battery model can be generated based on the measurement result of the battery charging process. A battery model can be edited, created, imported, or exported in a CSV file format. Figure 4. Battery test display. 2 TEK.COM Series 2281S Battery Simulator and Precision DC Power Supply Precision DC Power Supply, with DMM-quality High Resolution, Low Current Measurements Capability Figure 5. Battery model table. Easily View and Control Every Parameter of the Battery Test and Simulation Function The bright, 4.3-inch TFT display shows voltage, current, and amp-hour readings, source settings, and many additional settings in large, easy-to-read characters. The icon-based main menu provides all the functions users can control and program for fast access to source setup, measurement setup, display formats, trigger options, and system settings. Menus are short, and menu options are easy to find and are clearly described, enabling test parameters to be setup quickly by using the navigation wheel, keypad, or soft-keys. Many setup parameters, such as voltage and current settings, can be entered directly from the home screen. Less complex tests don’t require access to the main menu to make adjustments – just use soft keys on the home screen. Whether test requirements are simple or complex, the Series 2281S supplies provide a simple way to set up all required parameters. Unlike conventional power supplies, Series 2281S supplies feature up to 120 W, 20 V, and 6 A output and can also make measurements with up to 6½ digits of resolution. Voltage output measurements can be resolved down to 100 µV. These supplies measure load currents from 100 nA to amps. Four load current measurement ranges (10 A, 1 A, 100 mA, and 10 mA) support measuring a device’s full load current, standby mode current, and small sleep mode current with DMM-quality accuracy. The high resolution allows discerning small changes in load currents with confidence. It also makes it possible to make a broad range of measurements or a single range with excellent accuracy across both low and high current values. Optimized Performance for Production Test The 2281S-20-6 supplies are as powerful in a production test system as they are flexible on the R&D benchtop. They provide SCPI commands for all measurement functions. In addition, several other features can help minimize test time in automated systems. For example, an external trigger input allows hardware synchronization and control by other instruments in the test system. For the battery test and battery simulator function, the digital I/O can be configured as input or output. If the digital I/O is configured as input, the measurement can be triggered by external signals; if the digital I/O is configured as output, the digital I/O pin will send out a signal when the measurement is finished. Furthermore, to reduce measurement time, reading speed can be increased by reducing the acquisition time from 16.6 ms (or 20 ms) to 33 μs (40 μs). Figure 6. Battery test menu. TEK.COM 3 Datasheet A choice of front or rear panel terminals provides enhanced connection flexibility. For maximum voltage accuracy, 4-wire remote sensing ensures that the output voltage programmed is actually the level applied to the load. In addition, the sense lines are monitored in order to detect any breaks in them. These features ensure that any production problems can be quickly identified and corrected. Series 2281S supplies can be Figure 7. 2281S rear panel. 4 TEK.COM controlled via their built-in GPIB, USB, or LAN interfaces. The USB interface is test and measurement system (TMC) compliant. The LXI Core compliant LAN interface supports controlling and monitoring a Series 2281S supply remotely, so test engineers can always access the power supply and view measurements, even if located on a different continent than the test systems. Series 2281S Battery Simulator and Precision DC Power Supply Specifications 23 °C ±5 °C with 1-hour instrument warm-up. DC Output Ratings Voltage 0 to 20 V. Current 0 to 6 A. Maximum Power 120 W. Voltage1 Source Setting Accuracy ±(0.02% + 3 mV). Resolution 1 mV. Measurement2 (0.5V over-range) Accuracy ±(0.02% + 2 mV). Resolution 0.1 mV. Additional Offset at Faster Measurement Settings 5½ (0.1 PLC) 0.21 mV. 4½ (0.01 PLC) 1.44 mV. 3½ (0.002 PLC) 7.60 mV. Regulation Load ±(0.01% + 2 mV). Line ±(0.01% + 1 mV). Output Ripple and Noise Bandwidth 20 Hz–20 MHz