# Keithley 2281S-20-6 Precision DC Supply and Battery Simulator, 20 V, 6 A # Keithley 2281S-20-6 Precision DC Supply and Battery Simulator, 20 V, 6 A ## Key Features At A Glance - Maximum input/output ratings: 0–20 V, 0–6 A, 120 W with current sink capability up to 1 A - Battery simulation based on a selected battery model with two modes — Static (Voc and SOC fixed) and Dynamic (Voc and SOC change with charge/discharge) - Simulated battery parameter ranges: Voc 0 to 20 V, ESR 0 to 10 ohms, capacity 1 mAh to 99 Ah, 101 points per simulation - Battery test function performs charge/discharge testing and automatically computes battery capacity (Amp-Hour) and internal resistance (ESR) - Linear-regulated output with low noise: <1 mV RMS, <6 mV peak-to-peak (20 Hz–20 MHz bandwidth) - 6½-digit measurement resolution with four load current ranges (10 mA, 100 mA, 1 A, 10 A) for current measurement from 100 nA to 6 A - GPIB (IEEE-488.2), USB (USBTMC), and LAN (LXI Core 2011) interfaces standard for automated measurement systems - 4.3-inch color TFT display with soft-key/icon-based interface and built-in graphing for voltage/current trend analysis The Keithley 2281S-20-6 is a Series 2281S Battery Simulator and Precision DC Power Supply that integrates battery simulation with the functions of a high-precision linear-regulated DC power supply. The instrument can analyze the DC current consumption of a device under test, generate a battery model based on a battery charging process, and simulate a battery based on that model. Output ratings are 0 to 20 V, 0 to 6 A, and 120 W maximum, with current sinking capability up to 1 A. Applications addressed in the datasheet center on battery-powered device development and testing. The battery simulator function allows engineers to simulate a real battery's output performance across its charge and discharge cycles, setting State of Charge (SOC) and open-circuit voltage (Voc) to any state in order to test a device-under-test's performance at various battery states. The battery test function performs charge/discharge testing on physical batteries, with charging current from 0 to 6 A and maximum discharging current of 1 A, automatically computing battery capacity in Amp-Hours and Equivalent Series Resistance (ESR) during the process. The instrument also functions as a standalone precision DC power supply for general bench and automated test work. ValueTronics has stocked, tested, and shipped Keithley test and measurement instruments since 1992 from our 20,000 sq ft secure warehouse at 1675 Cambridge Drive in Elgin, Illinois. Every {{CONDITION}} Series 2281S unit is handled directly by our team in Elgin rather than passed through a third party — meaning the people who tested the instrument are the same people who can answer technical and condition-history questions about it. This direct ownership of the inventory, testing process, and shipping is the operational foundation behind every quote and condition report we issue. ## Brand Heritage Keithley Instruments was founded in 1946 in Cleveland, Ohio, and became part of Tektronix in 2010 when both companies were brought under Danaher Corporation. In 2016, Tektronix and Keithley moved to Fortive Corporation following Danaher's spin-off of its industrial businesses. The Series 2281S is sold today as a Keithley product within the Tektronix family of test and measurement brands. ## Accessories Supplied - Quick Start Guide - KickStart Quick Start Guide - LAN Crossover Cable - Power Cord - Rear Panel Mating Connector with Cover ## Product Core & Specifications 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 Voltage — Source Setting Accuracy ±(0.02% + 3 mV) Resolution 1 mV Voltage — Measurement (0.5 V over-range) Accuracy ±(0.02% + 2 mV) Resolution 0.1 mV Additional Offset at Faster Measurement Settings (Voltage) 5½ (0.1 PLC) 0.21 mV 4½ (0.01 PLC) 1.44 mV 3½ (0.002 PLC) 7.60 mV Voltage Regulation Load ±(0.01% + 2 mV) Line ±(0.01% + 1 mV) Voltage Output Ripple and Noise Bandwidth 20 Hz–20 MHz <1 mV RMS, <6 mV p-p Load Transient Recovery Time Resistive load change 50% to 100% or 100% to 50%: <50 µs to within 15 mV of V-set Slew Rate Rising and Falling: 10 V/s to 100 V/s. Up to 1000 V/s under limited conditions. 100 V/s default. Maximum Source Voltage Drop per Lead 1 V (to maintain specified voltage accuracy) Maximum Sense HI and Sense LO Lead Resistance 2 Ω (to maintain specified voltage accuracy) Current — Current Limit Setting Full-scale Amps 6.1 A Accuracy ±(0.05% + 5 mA) Resolution 0.1 mA Current Measurement (120% over-range except 10 A) 10 mA range Resolution 10 nA, Accuracy ±(0.04% + 10 µA) 100 mA range Resolution 100 nA, Accuracy ±(0.04% + 10 µA) 1 A range Resolution 1 µA, Accuracy ±(0.04% + 250 µA) 10 A range Resolution 10 µA, Accuracy ±(0.05% + 250 µA) Current Pulse Measurement Minimum Pulse Width (10 mA and 100 mA range) 2 ms Minimum Pulse Width (1 A and 10 A range) 140 µs Minimum Time to Capture Two Consecutive Pulses 0.5 ms Current Regulation Load ±(0.01% + 0.25 mA) Line ±(0.01% ± 0.25 mA) Current Output Ripple and Noise Bandwidth 20 Hz–20 MHz <3 mA RMS Maximum Continuous Average Sink Current Non-programmable 1.02 A ± 0.1 A (typical) 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 Other Timing Data CV to CC Transition Time (V-Set = 5 V, I-limit = 0.5 A, Resistive Load Change 25 Ω to 2.5 Ω) 2.4 ms CC to CV Transition Time (V-Set = 5 V, I-limit = 0.5 A, Resistive Load Change 2.5 Ω to 25 Ω) 1.1 ms Function Change 10 ms (typical) Output Off/On 5 ms (typical) Reverse Leads Actuation \>1.5 ms Protection — Overvoltage (OVP) Setting Accuracy ±(0.25% + 0.25 V) Resolution 125 mV Response Time <1.5 ms Protection — Overcurrent (OCP) Setting Accuracy ±(0.25% + 0.10 A) Resolution 25 mA Response Time <1.5 ms Protection — Overtemperature (OTP) Output Turn-off Temperature \>93 °C (typical) Response Time <1.5 ms (typical) General Common Mode Current <6 µA peak-peak (typical) Chassis Isolation ±240 V, any terminal to chassis. >1 GΩ in parallel with <6.8 nF Measurement Display Modes Voltage and current, voltage only, current only Measurement Acquisition Control Continuous, manual, external digital input, PC bus List Mode Max 9 stored lists; 2–99 points per list; internal or USB storage Memory Buffer 2500 locations (voltage, current, CV/CC mode, time stamp); 9 memory slots for battery models; NVRAM Display 4.3 in. front panel color TFT, 480 × 272 pixels Communications GPIB IEEE-488.2 compliant LAN RJ-45 connector, 10/100BT, Auto MDIX; Static or DHCP; LXI Core 2011, version 1.4 USB USB2.0 device (rear, type B), USBTMC compliant; USB2.0 host (front, type A), full speed, supports U-disk drives Input Connections Front 2-wire, adjustable supporting safety shrouded banana, spade lug, or wire Rear 4-wire sense, 6-pin removable screw terminal, safety shrouded cover, removable local sense jumpers Digital I/O Connector 9-pin female D-sub, 6 Input/Output pins Input Signal Levels 0.7 V (max logic low), 3.7 V (min logic high) Input Voltage Limits −0.25 V (absolute min), +5.25 V (absolute max) Maximum Source Current +2.0 mA @ >2.7 V (per pin) Maximum Sink Current −50 mA @ 0.7 V (per pin, solid-state fuse protected) Safety / Compliance EMC Conforms to European Union EMC directive U.S. NRTL Listing UL61010-1 3rd ed 2012 Canadian Certification CAN/CSA C22.2 No. 61010-1 3rd ed 2012 European Union Compliance Low Voltage Directive, EN/IEC 61010-1 3rd ed 2010 Power / Environment Cooling Forced air, side intake, rear exhaust Power Supply 100 V / 120 V / 220 V / 240 V ±10% Power Line Frequency 50/60 Hz ±3 Hz, automatically sensed at power-on Power Consumption 630 VA peak **Important:** Voltage source and measurement specifications are based on remote (4-wire) sense connections. For 2-wire connections at the front terminals, add an offset of 0.5 mV/A to voltage accuracy. Maximum source voltage drop per lead is 1 V and maximum Sense HI / Sense LO lead resistance is 2 Ω to maintain specified voltage accuracy.**Important:** Voltage specifications are based on using remote sense connections. For 2-wire connections, add an offset of 0.5 mV/A (front terminals).**Important:** 100 V/s to 1000 V/s slew rate is limited to 5 V changes at a maximum of 3 A.**Important:** Test leads are not included with the base unit. The 2280-TEST-LEAD Power Supply Test Lead Kit (1000 V, 20 A rating, 122 cm / 4 ft, with spade lug adapters and alligator clips) is sold separately as an Available Accessory.Recommended pairing: when building battery models, use a Keithley 2450 or 2460 Series Source Measure Unit with a model-generating test script to discharge the battery and create the battery model file for import into the 2281S-20-6 Battery Simulator — the workflow shown in the datasheet's battery model creation diagram. **Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.** ## Details - **Price:** 5030.0 USD - **Vendor:** Keithley - **Type:** Dc Supply - **Tags:** DC Power Supply, Keithley, Manufacturers, Power Supplies & Loads, product_manual_group_3, Product_new ## Variants | Variant | Price | Available | |---------|-------|-----------| | Default Title | 5030.00 USD | In stock | ## Images - 2281S-20-6 Keithley DC Power Supply --- > Source: [ValueTronics](https://valuetronics.com/products/2281s-20-6-keithley-dc-power-supply-new) > Updated: 2026-05-30