2281S-20-6 - Keithley Instruments, Inc.

DC POWER SUPPLIES

A Greater Measure of Conﬁdence

www.keithley.com

1.888.KEITHLEY (U.S. only)

A Tektronix Company

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 and battery testing. It’s able to analyze

the DC consumption of a device under test, test a battery, and generate a battery model based on bat-

tery charging process and simulate a battery based on the battery model. The 2281S-20-6 can output

up power to 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 displays a wide range of informa-

tion on measurements. Soft-key buttons and a navigation wheel combine with the TFT display to pro-

vide 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.

Figure 1. Series 2281S startup screen.

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 the device under specific circum stance. There are two modes from which to choose:

• 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.

• Simulate a battery’s output

during the charge and discharge

cycles

• Create, edit, import, and export

battery models

• Build a library of battery

models automatically based

on measurement results using

battery test mode

• 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)

• Program the battery SOC, Voc,

capacity, and resistance

• Provide two modes of

simulation–dynamic and static

• Monitor charge/discharge

current and voltage

• Output up to 120W of low

noise, linear regulated power

• Monitor load currents from

100nA to 6A with high accuracy

• Measure voltage and current

with 6½-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 power supply

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.

Battery simulator and precision DC power supply

DC POWER SUPPLIES

www.keithley.com

1.888.KEITHLEY (U.S. only)

A Greater Measure of Conﬁdence A Tektronix Company

Figure 3. Graph of Voc, ESR, and SOC.

Determine SOC and ESR and create a battery model during battery testing

In the 2281S battery test function, charge/discharge test on a battery can be performed. Charging

current ranges from 0 to 6A, and the maximum discharging current is 1A. During the 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.

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.

Figure 5. Battery model.

Ordering Information

2281S-20-6 Precision DC

Supply and Battery

Simulator, 20V, 6A

Accessories Supplied

Quick Start Guide

KickStart Quick Start Guide

User Documentation CD

LAN Crossover Cable

Power Cord

Rear Panel Mating

Connector with Cover

Series 2281S

Battery Simulator and

Precision DC Power Supply

ACCESSORIES AVAILABLE

2280-001 Rear Panel Mating Connector and Cover

2280-TEST-LEAD

Power Supply Test Lead Kit, 1000VA, 20A Rating

2450-TLINK Trigger Link Cable to connect 2281S Digital I/O to

Trigger Link I/O on other Keithley instruments

4299-8 Single Fixed Rack-Mount Kit

4299-9 Dual Fixed Rack-Mount Kit

4299-10 Dual Fixed Rack-Mount Kit for one 2U Graphical

Display Instrument and one Series 26xx

Instrument

4299-11 Dual Fixed Rack-Mount Kit for one 2U Graphical

Display Instrument and one Series 24xx, Series

2000, or 2U Agilent Instrument

CA-180-3A LAN crossover cable

7007-05 Double Shielded Premium IEEE-488 Interface

Cables, 0.5m (1.6 ft)

7007-1 Double Shielded Premium IEEE-488 Interface

Cables, 1m (3.2 ft)

7007-2 Double Shielded Premium IEEE-488 Interface

Cables, 2m (6.5 ft)

7007-3 Double Shielded Premium IEEE-488 Interface

Cables, 3m (10 ft)

7007-4 Double Shielded Premium IEEE-488 Interface

Cables, 4m (13 ft)

KPCI-488LPA IEEE-488.2 Interface Board for the PCI Bus

KUSB-488B IEEE-488.2 USB-GPIB Interface Adapter for USB

Port with 2m (6.6 ft) cable

USB-B-1 USB Cable Type A to B, 1 m (3.3 ft)

SERVICES AVAILABLE

2281S-20-6-EW 1 Additional Year of Factory Warranty

(total of 4 years)

2281S-20-6-3Y-STD 3 Calibrations within 3 Years of Purchase

2281S-20-6-3Y-DATA 3 (ANSI-Z540-1 compliant) Calibrations

within 3 Years of Purchase

2281S-20-6-3Y-17025 3 (ISO 17025 Accredited) Calibrations

within 3 Years of Purchase

2281S-20-6-5Y-STD 5 Calibrations Within 5 Years of Purchase

2281S-20-6-5Y-DATA 5 (ANSI-Z540-1 compliant) Calibrations

within 5 Years of Purchase

Battery simulator and precision DC power supply

DC POWER SUPPLIES

A Greater Measure of Conﬁdence

www.keithley.com

1.888.KEITHLEY (U.S. only)

A Tektronix Company

Series 2281S Battery Simulator and

Precision DC Power Supply

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, measure-

ment 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 com-

plex, the Series 2281S supplies provide a simple way to set up all required

parameters.

Figure 6. Battery test menu.

Precision DC power supply, with DMM-quality

high resolution, low current measurements capability

Unlike conventional power supplies, Series 2281S supplies feature up to

120W, 20V, and 6A output and can also make measurements with up to 6½

digits of resolution. Voltage output measurements can be resolved down to

100µV. These supplies measure load currents from 100nA to amps. Four

load current measurement ranges (10A, 1A, 100mA, and 10mA) 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

Series 2281S are as powerful in a production test system as they are flexi-

ble on the R&D benchtop. They provide SCPI commands for all measure-

ment 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 sys-

tem. 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, read-

ing speed can be increased by reducing the acquisition time from 16.6ms

(or 20ms) to 33µs (40µs).

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 con-

trolled via their built-in GPIB, USB, or LAN interfaces. The USB interface

is test and measurement system (TMC) compliant. The LXI Core com-

pliant 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.

Figure 7. 2281S rear panel.

Battery simulator and precision DC power supply

DC POWER SUPPLIES

www.keithley.com

1.888.KEITHLEY (U.S. only)

A Greater Measure of Conﬁdence A Tektronix Company

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 20V.

CURRENT: 0 to 6A.

MAXIMUM POWER: 120W.

VOLTAGE 1

SOURCE SETTING

ACCURACY: ±(0.02% + 3mV).

RESOLUTION: 1mV.

MEASUREMENT

(0.5V over-range)

ACCURACY: ±(0.02% + 2 mV).

RESOLUTION: 0.1mV.

ADDITIONAL OFFSET AT FASTER MEASUREMENT SETTINGS

5½ (0.1 PLC): 0.21mV.

4½ (0.01 PLC): 1.44mV.

3½ (0.002 PLC): 7.60mV.

REGULATION

LOAD: ±(0.01% + 2mV).

LINE: ±(0.01% + 1mV).

OUTPUT RIPPLE AND NOISE

BANDWIDTH 20Hz–20MHz: <1mV RMS, <6mV p-p.

LOAD TRANSIENT RECOVERY TIME: Resistive load change 50% load to 100% load or 100%

load to 50% load: <50µs to within 15mV of V-set.

SLEW RATE: Rising Voltage and Falling Voltage: 10V/s to 100V/s. Up to 1000V/s under limited

conditions 3. 100V/s (default).

MAXIMUM SOURCE VOLTAGE DROP PER LEAD: To Maintain Specified Voltage Accuracy: 1V.

MAXIMUM SENSE HI AND SENSE LO LEAD RESISTANCE: To Maintain Specified Voltage

Accuracy: 2Ω.

CURRENT

CURRENT LIMIT SETTING

FULL-SCALE AMPS: 6.1A.

ACCURACY: ±(0.05% + 5mA).

RESOLUTION: 0.1mA.

MEASUREMENT 4 (120% over-range except 10A)

Range Resolution

Accuracy

10 mA 10 nA ±(0.04% + 10 µA)

100 mA 100 nA ±(0.04% + 10 µA)

1 A 1 µA ±(0.04% + 250 µA)

10 A 10 µA ±(0.05% + 250 µA)

ADDITIONAL OFFSET AT FASTER MEASUREMENT SETTINGS 9

Measure Resolution

and (NPLC) Range

Resolution

5½ (0.1 PLC)

10 mA 5.0 µA

100 mA 20 µA

1 A 80 µA

10 A 2.0 mA

4½ (0.01 PLC)

10 mA 20 µA

100 mA 40 µA

1 A 500 µA

10 A 10 mA

3½ (0.002 PLC)

10 mA 30 µA

100 mA 250 µA

1 A 20 mA

10 A 75 mA

CURRENT PULSE MEASUREMENT 5

MINIMUM PULSE WIDTH (10mA and 100mA range) 6: 2ms.

MINIMUM PULSE WIDTH (1A AND 10A RANGE) 6: 140µs.

MINIMUM TIME TO CAPTURE TWO CONSECUTIVE PULSES: 0.5ms.

REGULATION

LOAD: ±(0.01% + 0.25 mA).

LINE: ±(0.01% ± 0.25 mA).

OUTPUT RIPPLE AND NOISE

BANDWIDTH 20Hz–20MHz: <3mA RMS.

MAXIMUM CONTINUOUS AVERAGE SINK CURRENT

NON-PROGRAMMABLE: 1.02A ± 0.1A (typical).

Series 2281S specifications

Battery simulator and precision DC power supply

DC POWER SUPPLIES

A Greater Measure of Conﬁdence

www.keithley.com

1.888.KEITHLEY (U.S. only)

A Tektronix Company

Series 2281S Battery Simulator and

Precision DC Power Supply

SYSTEM MEASUREMENT SPEEDS

Settings Concurrent ( V+I )

Readings/s Measure Resolution

and (NPLC)

Autozero

60 Hz (50 Hz)

Autozero

OFF

60 Hz (50 Hz)

‘Read?’ with BUS Transfer

6½ (5 PLC) 2.0 (1.5) 5.4 (4.5)

6½ (1 PLC) 9.0 (8.0) 20 (18)

5½ (0.1 PLC) 48 (38) 50 (48)

‘*TRG and TRACe:DATa?’ with

BUS Transfer

4½ (0.01 PLC) 7 680 (646)

3½ (0.002 PLC) 7 845 (833)

OTHER TIMING DATA

CV TO CC TRANSITION TIME (V-Set = 5V, I-limit = 0.5A, Resistive Load change 25Ω to

2.5Ω): 2.4ms.

CC TO CV TRANSITION TIME (V-Set = 5V, I-limit = 0.5A, Resistive Load change 2.5Ω to

25Ω): 1.1ms.

FUNCTION CHANGE (from detection of bus command to function change completed):

10ms (typical).

OUTPUT OFF/ON (from detection of bus command to voltage beginning to decrease):

5ms (typical).

REVERSE LEADS ACTUATION: >1.5ms.

PROTECTION

OVERVOLTAGE PROTECTION (OVP)

SETTING ACCURACY: ±(0.25% + 0.25V).

RESOLUTION: 125mV.

RESPONSE TIME: <1.5ms.

OVERCURRENT PROTECTION (OCP)

SETTING ACCURACY: ±(0.25% + 0.10A).

RESOLUTION: 25mA.

RESPONSE TIME: <1.5ms.

OVERTEMPERATURE PROTECTION (OTP)

OUTPUT TURN-OFF TEMPERATURE: >93°C (typical).

RESPONSE TIME: <1.5 ms (typical)8.

NOTES

1. Specifications based on using remote sense connections. For 2-wire connections, add an offset of 0.5mV/A

(front terminals).

2. 6½-digit resolution, 1 PLC reading rate, Filter on, Autozero on.

3. 100V/s to 1000V/s slew rate is limited to 5V changes at a maximum of 3A for the 2281S-20-6 supply.

4. 6½-digit resolution, 1 PLC reading rate, filter on, autozero on.

5. Settings: Autozero off, 0.002 PLC, Arm Source:external, Trigger Source:Immediate.

6. Time includes trigger detection, latency plus jitter of start of measurement, and measurement integration time,

0.002 PLC.

7. Settings:Autozero Off, Output On, Output Delay Off, Fixed Source:Voltage.

8. Settings: Autozero Off, Output On, Output Delay Off, Fixed Source:Voltage, Arm or Measure count 1000.

Series 2280S Accessories

Model 2280-001: Rear Panel Mounting Connector and Cover

(assembled view on the left, and connector and top and bottom cover

shown separately on the right)

Model 2280-TEST-LEAD: Power Supply Test Lead Kit, 1000V, 20A Rating:

Contains 122cm (4ft) of cable, spade lug adapters, and alligator clips

Series 2281S specifications

DC POWER SUPPLIES

Series 2281S Battery Simulator and

Precision DC Power Supply

GENERAL

COMMON MODE CURRENT: < 6µA peak-peak (typical).

CHASSIS ISOLATION: ±240V, any terminal to chassis. >1GΩ in parallel

with <6.8nF.

TEMPERATURE COEFFICIENT: Add the following to all accuracy specifications when

outside the range, 23°C ±5°C: (0.15 × specification)/°C for 0° to 18°C and 28° to 40°C.

MEASUREMENT DISPLAY MODES: Voltage and current, voltage only, current only.

MEASUREMENT ACQUISITION CONTROL: Continuous, manual, external digital input,

PC bus.

LIST MODE: Maximum number of stored lists: 9.

Number of points in a list: 2–99.

List Storage Location: Internal memory or USB memory stick.

MATH AND FILTER FUNCTIONS:

REL: Removes offset from current reading display, Range: –1×106 to +1×10 6.

Mx+b: Reading = x, M = –1×106 to +1×10 6, b = –1×106 to +1×106.

Filter: Moving average, Count: 2–100, Window: 0.01% to 100%.

MEMORY BUFFER:

2500 locations; each location contains: Voltage measurement, current measurement,

CV/CC Mode, and time stamp.

9 memory slot for saving battery model.

NVRAM.

DISPLAY: 4.3 in. front panel color display, resolution: 480 pixels × 272 pixels.

Display Modes:

Real time voltage and current readings and settings.

Plots of stored data: Voltage vs. data point, current vs. data point, voltage and

current vs. data point, 100 point resolution.

Plots can also display statistics: mean, maximum, minimum, peak-peak,

standard deviation.

Table of stored data: Time/date, voltage, current.

Soft button and navigation wheel control.

COMMUNICATIONS:

GPIB: IEEE-488.2 compliant and status model topology.

LAN: RJ-45 connector, 10/100BT, Auto MDIX.

IP Configuration: Static or DHCP.

LXI Core 2011, version 1.4,

USB: USB2.0 device (rear panel, type B), USBTMC compliant.

USB2.0 host (front panel, type A), full speed, support U-disk drives.

INPUT CONNECTIONS:

Front: (2-wire). Adjustable supporting, safety shrouded banana, spade lug, or wire.

Rear: (4-wire sense). 6-pin removal screw terminal, safety shrouded cover, removable

local sense jumpers.

REAL-TIME CLOCK: Capacitive charged, 20 days between next power on cycle at 23°C

and ≤50%RH.

DIGITAL I/O: 9-pin female D-sub. 6 Input/Output pins.

Input Signal Levels:

0.7V (maximum logic low).

3.7V (minimum logic high).

Input Voltage Limits:

–0.25V (Absolute minimum).

+5.25V (Absolute maximum).

Maximum Source Current: +2.0mA@ >2.7V (per pin).

Maximum Sink Current: –50mA @ 0.7V (per pin, solid-state fuse protected).

5V power supply, limited to 0.5A @ >4V (solid-state fuse protected).

Trig In minimum pulse ≥4µs, Logic Low pulse.

Meter Ready Pulse, 15–30µs, Logic Low Pulse.

EMC: Conforms to European Union EMC directive.

SAFETY:

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.

COOLING: Forced air, side intake, and rear exhaust.

POWER SUPPLY: 100V/120V/220V/240V ±10%.

POWER LINE FREQUENCY: 50/60Hz ±3Hz, automatically sensed at power-on.

POWER CONSUMPTION: 630VA peak.

OPERATING ENVIRONMENT: 0° to 40°C, ≤80% RH up to 35°C, non-condensing.

Altitude: up to 2000 meters.

STORAGE ENVIRONMENT: –25° to 70°C.

LXI WEB BROWSER COMPATIBLE OPERATING SYSTEM AND SOFTWARE: Windows 2000,

Win 7, and XP compatible, supports Web browsers with Java plug-in (requires Java plug-in 1.7 or

higher). Web page served by Model 2281S.

RACK DIMENSIONS: (W×H×D), without boot: 213.8 × 88.4 × 383.3mm (8.42 × 3.48 × 15.1 in.).

BENCH DIMENSIONS: (W×H×D) with boot: 255.3 × 107.2 × 415.0mm (10.1 × 4.22 × 16.34 in.)

SHIPPING WEIGHT: 13.29kg (29.3 lbs.).

NET WEIGHT: 10.85kg (23.9 lbs.).

WARR ANTY: 3 years.

Specifications are subject to change without notice. All Keithley trademarks and trade names are the property of Keithley Instruments.

All other trademarks and trade names are the property of their respective companies.

KEITHLEY INSTRUMENTS ■ 28775 AURORA RD. ■ CLEVELAND, OH 44139-1891 ■ 440-248-0400 ■ Fax: 440-248-6168 ■ 1-888-KEITHLEY ■ www.keithley.com

A Greater Measure of Conﬁdence

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Series 2281S specifications

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2281S-20-6