Series 2281S
• Simulate a battery’s output during
the charge and discharge cycles
• Create, edit, import, and export
battery models
Battery Simulator and
Precision DC Power Supply
• Display the real-time change
of the SOC, V
oc
, and V
t
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 1. Series 2281S startup screen.
Figure 2. Battery simulator home screen.
The Series 2281S Battery Simulator and Precision DC Power Supply innovatively inte-
grates 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 battery 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 information on measurements. Soft-key buttons and a navigation wheel
combine with the TFT display to provide an easy-to-navigate user interface that acceler-
ates instrument setup and operation. In addition, built-in plotting functions allow monitor-
ing 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, trig-
gers, and other speed optimization functions to minimize test time in automated testing
applications.
Battery simulation based on a battery model
•
Static: During the static simulation, V
oc
and SOC stay the same.
•
Dynamic: During the dynamic simulation, V
oc
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.
A Tektronix Company
DC POWER SUPPLIES
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 circumstance.
There are two modes from which to choose:
Battery Simulator and Precision DC Power Supply
• Build a library of battery
models automatically based
on measurement results using
battery test mode
Series 2281S
Battery Simulator and
Precision DC Power Supply
Ordering Information
2281S-20-6 Precision DC
Supply and Battery
Simulator, 20V, 6A
Battery Simulator and Precision DC Power Supply
Accessories Supplied
Quick Start Guide
KickStart Quick Start Guide
User Documentation CD
LAN Crossover Cable
Power Cord
Rear Panel Mating
Connector with Cover
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)
Figure 3. Graph of V
oc
, 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.
SERVICES AVAILABLE
DC POWER SUPPLIES
2281S-20-6-EW
2281S-20-6-5Y-EW
C/2281S-20-6-3Y-STD
C/2281S-20-6-3Y-DATA
C/2281S-20-6-5Y-STD
C/2281S-20-6-5Y-DATA
1 Additional Year of Factory Warranty
(total of 4 years)
2 Additional Years of Factory Warranty
(total of 5 years)
3 Calibrations within 3 Years of
Purchase
3 (ANSI-Z540-1 compliant) Calibrations
within 3 Years of Purchase
5 Calibrations Within 5 Years of
Purchase
5 (ANSI-Z540-1 compliant) Calibrations
within 5 Years of Purchase
Figure 5. Battery model.
A Tektronix Company
Series 2281S
Battery Simulator and
Precision DC Power Supply
Optimized performance for production test
Series 2281S 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 config-
ured as input or output. If the digital I/O is configured as input,
the measurement can be triggered by external signals; if the dig-
ital 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 16.6ms (or 20ms) to 33µs (40µs).
A choice of front or rear panel terminals provides enhanced con-
nection 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 controlled 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 dif-
ferent continent than the test systems.
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 set-
tings 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 navi-
gation 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.
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 mea-
suring 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.
Figure 7. 2281S rear panel.
A Tektronix Company
DC POWER SUPPLIES
Battery Simulator and Precision DC Power Supply
Series 2281S
Specifications
DC OUTPUT RATINGS
Voltage:
0 to 20V.
Current:
0 to 6A.
Maximum Power:
120W.
Battery Simulator and
Precision DC Power Supply
CURRENT
CURRENT LIMIT SETTING
Full-scale Amps:
6.1A.
Accuracy:
±(0.05% + 5mA).
Resolution:
0.1mA.
MEASUREMENT
4
(120% OVER-RANGE EXCEPT 10A)
Range
10 mA
100 mA
1 A
10 A
Resolution
10 nA
100 nA
1 µA
10 µA
Accuracy
±(0.04% + 10 µA)
±(0.04% + 10 µA)
±(0.04% + 250 µA)
±(0.05% + 250 µA)
23°C ±5°C with 1-hour instrument warm-up.
Series 2281S specifications
SOURCE SETTING
Accuracy:
±(0.02% + 3mV).
Resolution:
1mV.
MEASUREMENT
2
(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.
ADDITIONAL OFFSET AT FASTER MEASUREMENT SETTINGS
9
Measure Resolution
and (NPLC)
5½ (0.1 PLC)
Range
10 mA
100 mA
1 A
10 A
10 mA
100 mA
1 A
10 A
10 mA
100 mA
1 A
10 A
Resolution
5.0 µA
20 µA
80 µA
2.0 mA
20 µA
40 µA
500 µA
10 mA
30 µA
250 µA
20 mA
75 mA
4½ (0.01 PLC)
3½ (0.002 PLC)
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).
DC POWER SUPPLIES
A Tektronix Company
Battery simulator and precision DC power supply
VOLTAGE
1
Series 2281S
Battery Simulator and
Precision DC Power Supply
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.
SYSTEM MEASUREMENT SPEEDS
Settings
Readings/s
‘Read?’ with BUS Transfer
‘*TRG and TRACe:DATa?’
with BUS Transfer
Measure Resolution
and (NPLC)
6½ (5 PLC)
6½ (1 PLC)
5½ (0.1 PLC)
4½ (0.01 PLC)
7
3½ (0.002 PLC)
7
Concurrent ( V+I )
Autozero
On
60 Hz (50 Hz)
Autozero OFF
60 Hz (50 Hz)
2.0 (1.5)
5.4 (4.5)
9.0 (8.0)
20 (18)
48 (38)
50 (48)
680 (646)
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.
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).
A Tektronix Company
DC POWER SUPPLIES
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
Series 2281S specifications
