Series 2268
•
Six 850W models with
maximum voltage outputs from
20V to 150V, maximum current
outputs from 42A to 5.6A
•
Compact 1U, half-rack enclosure
provides the highest power in
the smallest package
•
Two auxiliary outputs support
driving or signaling external
devices, often eliminating
the need for additional
instrumentation
•
Isolated analog inputs minimize
control line noise
•
Built-in LAN, USB, GPIB, RS-232,
RS-485 interfaces and analog
inputs are all standard
•
Constant voltage, constant
current, and constant power
setting control
•
Auto sequence control supports
internal execution of commands
to minimize bus communication
time
•
Control up to 30 supplies
through a single controller
interface
•
Foldback mode with
programmable delay shuts
down the output on transitions
between CV and CC operation
to protect voltage- or current-
sensitive devices
•
Numerous safety features
protect the load and the supply,
including: over-voltage and
under-voltage protection,
over-current protection, over-
temperature protection, loop
protection for multiple-supply
configurations, and a hardware
output interlock
APPLICATIONS
• Production testing
• Environmental testing
• Accelerated life testing
• Process control systems
850W DC Power Supplies
W 3-Y
ar ea
ra r
nt
y
850W DC power supplies
The six models in the 850W DC Power Supplies in the Series 2268 provide voltage and current output
levels well suited for automated test applications. They offer maximum voltage outputs of 20V, 40V,
60V, 80V, 100V, and 150V with corresponding maximum current outputs of 42A, 21A, 14A, 10.5A,
8.5A, and 5.6A. Series 2268 supplies allow outputting any current, including the maximum current,
at any voltage. They provide both analog and digital control options and a number of digital interface
options and can operate in constant voltage (CV), constant current (CC), or constant power modes
to address a broad array of applications. These high-efficiency, soft-starting power supplies provide
reliable performance and long life.
850W in the Most Compact Package
The Series 2268 supplies offer the highest power density in the smallest package. The Series 2268
supplies are packaged in a low profile 1U high, half-rack width enclosure. These supplies take up
minimum space in a test rack. When multiple supplies are needed, these supplies can easily mount
side-by-side in a test rack to provide two outputs in a 1U height space. Ventilation for the Series 2268
supplies is from the front of the instrument to the back so additional rack space for airflow above,
below, or to the side of the supplies is not required. Thus, only 1U of total rack height is all that is
needed. Furthermore the Series 2268 power supplies operate at temperatures up to 50°C so that they
can perform reliably even in test racks that have elevated temperatures.
PC
Sensors
Isolated
Analog
Input
PLC
Interlock
Series 2268
DC Power Supply
Output +
Output –
Aux Out
15V
Aux Out
5V
Control Relay
DUT or
Load
Safety Limit
Switches
Fixture
Control
Use a Series 2268 DC supply as part of a control system. Analog control signals can program
the supply’s output. In addition to driving the load, the supply’s two auxiliary outputs can
drive external devices or circuits. The auxiliary outputs can eliminate the need for extra power
sources in a test system. Interlock connections can turn off the supply’s output if an unsafe
external condition is detected.
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A Greater Measure of Confidence
DC POWER SUPPLIES
850W DC power supplies
Series 2268
850W DC Power Supplies
Ordering Information
2268-20-42
850W DC Power
Supply, 20V, 42A
2268-40-21
850W DC Power
Supply, 40V, 21A
2268-60-14
850W DC Power
Supply, 60V, 14A
2268-80-10
850W DC Power
Supply, 80V, 10.5A
2268-100-8
850W DC Power
Supply, 100V, 8.5A
2268-150-5
850W DC Power
Supply, 150V, 5.6A
Accessories Supplied
CD with manual, power cord, test
lead connection hardware (for
2268-20-42 and 2268-40-21 only)
Downloads from www.keithley.com
IVI driver
LabVIEW driver
PC
Power Supply #1
In
LAN, USB, GPIB,
RS-485, RS-232
Out
Power Supply #2
RS-485
In
Out
850W DC power supplies
In
Out
Control up to 30 Series 2268 power supplies through one interface to a master supply. The
additional supplies are daisy-chained to the master through serial RS-485 connections.
A Full Complement of Control and Interface Options
Series 2268 power supplies offer users a wide range of interface options, including built-in LAN,
USB, GPIB, RS-232, and RS-485 control interfaces. The supplies can also be controlled by analog
control signals. A supply’s voltage output and current can be set using either voltage or resistance
input values.
Both isolated and non-isolated analog inputs are available. When long control lines or control lines
exposed to an electrically noisy environment create signal integrity concerns, the isolated analog
inputs can reduce or eliminate the susceptibility to signal degradation.
An auto sequence program mode gives Series 2268 supplies the built-in intelligence needed to exe-
cute lists of commands. Multiple commands can be downloaded, stored in the power supply’s memo-
ry, and executed using a single command from the controller. The program can be repeated a specific
number of times or cycled continuously. This ability to execute a set of commands internally saves
test time by eliminating the delays involved in sending individual commands over a PC bus.
For large power systems that require multiple power supplies, up to 30 Series 2268 supplies can be
controlled through a single interface by linking all the supplies together through their RS-485 inter-
faces. That allows controlling all the supplies through a master unit, which can use any of the five
standard PC interfaces. This greatly simplifies managing multiple power supplies in a single system.
Auxiliary Outputs for External Device Control
In addition to the main output power, Series 2268 power supplies offer two auxiliary outputs, 15V
output and a 5V output, for signaling and control tasks, such as to supply signals to a device handler
or a test fixture control input. These auxiliary outputs can also drive external control relays. For test
systems that require a few control signals or relay control, these outputs can eliminate the need for
another power supply or data I/O card.
Expand Voltage or Current Capacity for Higher Output Requirements
For test applications that require a higher voltage or current output than a single supply can produce,
up to two Series 2268 power supplies can be connected in series or up to four of them connected in
parallel to produce the required output. Using the analog control lines, the supplies can be arranged
in a master-slave configuration. The safety settings for the master supply control the complete config-
uration of supplies so that all supplies are protected.
When an application requires a bipolar output, two Series 2268 power supplies can be linked with
the low terminal of one supply connected to the high terminal of the second one. This connection
can be tied to the common of the bipolar load; one supply produces a positive output and the second
supply effectively produces a negative output.
ACCESSORIES AVAILABLE
2268-HDR
2268-RMK-1
2268-RMK-2
USB-1-1
CA-180-3A
KPCI-488LPA
KUSB-488B
7007-05
Hardware to Connect Test Lead Lugs to the
2268-20-42 or 2268-40-21
Rack Mount Kit for One Series 2268 DC
Power Supply
Rack Mount Kit for Two Series 2268 DC
Power Supplies
USB Cable
Ethernet Crossover Cable
IEEE-488.2 Interface Board for the PCI Bus
IEEE 488.2 USB-GPIB Interface Adapter for
USB port
Double Shielded Premium IEEE-488 Interface
Cables, 0.5m (1.6 ft)
Double Shielded Premium IEEE-488 Interface
Cables, 1m (3.2 ft)
Double Shielded Premium IEEE-488 Interface
Cables, 2m (6.5 ft)
Double Shielded Premium IEEE-488 Interface
Cables, 3m (10 ft)
Double Shielded Premium IEEE-488 Interface
Cables, 4m (13 ft)
DC POWER SUPPLIES
7007-1
7007-2
7007-3
7007-4
1.888.KEITHLEY
(U.S. only)
www.keithley.com
A Greater Measure of Confidence
850W DC power supplies
Power Supply #30
RS-485
Series 2268
850W DC Power Supplies
SERVICES AVAILABLE
Model Number*-EW
Model Number-5Y-EW
1 additional year of factory warranty
2 additional years of factory warranty
beyond the standard 3-year warranty
C/Model Number-3Y-STD 3 calibrations within 3 years of
purchase
C/Model Number-3Y-DATA 3 (ANSI-Z540-1 compliant) calibrations
within 3 years of purchase
C/Model Number-5Y-STD 5 calibrations within 5 years of
purchase
C/Model Number-5Y-DATA 5 (ANSI-Z540-1 compliant) calibrations
within 5 years of purchase
* Replace Model Number with a power supply model number.
For example, if the Model 2268-60-14 is selected, then the part
number for 1 year of additional warranty option is 2268-60-14-
EW. Similarly, for the 3 standard calibrations option, the part
number is C/2268-60-14-3Y-STD.
Protection for the Load and the Power Supplies
Series 2268 power supplies provide one set of parameters designed to protect the load from damage
and another set that protect the supplies themselves. For applications that require outputting voltages
only within a narrow range, Series 2268 supplies support setting both over-voltage and under-voltage
shutdown levels. Over-current protection prevents excess current from damaging the load, the sup-
ply, or both. An over-temperature limit prevents excessively high temperatures that could damage the
supply’s internal components.
The Series 2268 power supplies incorporate a standard foldback function which, when enabled, will
turn the output off if the load condition causes the supply to switch between the CV and CC control
modes. In addition, the Series 2268 supplies add a programmable delay time to the foldback func-
tion to allow a time delay before the output is turned off. Thus, if the supply is powering a load with
a high in-rush current which is large enough to cause the supply to switch to the CC mode from the
CV mode, the delay would prevent the foldback function from an unwanted shutdown of the output
so that the load stays powered and reaches its steady-state current level. If an external interlock
circuit loses continuity, the hardware output interlock can be used to turn off a supply’s output.
Input/output lines allow external shutdown control and provide an output on/off status.
For test systems that integrate multiple Series 2268 supplies, loop protection allows up to four sup-
plies to be shut down as a group; there is no need to shut down the whole system.
850W DC power supplies
SPECIFICATION CONDITIONS
This document contains specifications and supplemental information for Series 2268 850 Watt DC Power Supplies. Specifications are
the standards against which Series 2268 instruments are tested. Upon leaving the factory, Series 2268 instruments meet these specifi-
cations. Supplemental and typical values are nonwarranted, apply at 23°C, and are provided solely as useful information.
SPECIFICATIONS
OUTPUT
Model
2268-20-42 2268-40-21 2268-60-14 2268-80-10 2268-100-8 2268-150-5
Output Voltage and Current
20 V
40 V
60 V
80 V
100 V
150 V
Maximum Output Voltage
1
Maximum Output Current
2
42 A
21 A
14 A
10.5 A
8.5 A
5.6 A
3
Maximum Output Power
850 W
850 W
850 W
850 W
860 W
850 W
Line Regulation (% of rated output + offset)
Voltage (0.005% + 2mV)
4
3.0 mV
4 mV
5 mV
6 mV
7 mV
9.5 mV
4
Current (0.01% + 1mA)
5.2 mA
3.1 mA
2.4 mA
2.1 mA
1.9 mA
1.6 mA
Load Regulation (% of rated output + offset)
Voltage (0.005% + 2mV)
5
3.0 mV
4 mV
5 mV
6 mV
7 mV
9.5 mV
Current (0.02% + 4mA)
6
12.4 mA
8.2 mA
6.8 mA
6.1 mA
5.7 mA
5.1 mA
Output Noise (RMS, 300kHz)
Voltage
8 mV
8 mV
8 mV
8 mV
8 mV
10 mV
7
Current
75 mA
45 mA
35 mA
25 mA
20 mA
16 mA
Output Ripple (peak‑peak, 20MHz)
Voltage
50 mV
50 mV
50 mV
80 mV
80 mV
100 mV
8
Maximum recommended remote sense line drop compensation per line
1.5 V
2V
3V
5V
5V
5V
Protection
Over-voltage trip point
1 V to 24 V
2 V to 44 V
3 V to 66 V
3 V to 95 V
3 V to 125 V
3 V to 180 V
range
Over-voltage trip-point
±0.24 V
±0.44 V
±0.66 V
±0.95 V
±1.25 V
±1.80 V
accuracy
Over-voltage programming
2.9 mV
5.3 mV
8 mV
11.4 mV
15 mV
21.6 mV
resolution
Over-current program
0% to 105% of rated current
setpoint range
1.888.KEITHLEY
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DC POWER SUPPLIES
850W DC power supplies
Series 2268
850W DC Power Supplies
ANALOG CONTROL
ANALOG VOLTAGE INPUT PROGRAMMING RANGE FOR
VOLTAGE AND CURRENT OUTPUT:
0.0V to a maximum voltage, which can be set from 2.0V
to 10V.
Resolution of the maximum voltage is 0.1V.
0.0V to maximum voltage corresponds to 0 to rated output.
ANALOG RESISTANCE INPUT PROGRAMMING RANGE FOR
VOLTAGE AND CURRENT OUTPUT:
0.0kΩ to a maximum resistance, which can be set from
2.0kΩ to 10kΩ.
Resolution of the maximum resistance is 0.1kΩ.
0kΩ to the maximum resistance corresponds to 0V to the
rated output voltage.
VOLTAGE AND CURRENT MONITOR OUTPUTS:
0.0V to a maximum voltage, which can be set from 2.0V
to 10V.
Resolution of the maximum voltage is 0.1V.
0.0V to maximum voltage corresponds to 0V to rated voltage
output and 0A to rated current output.
VOLTAGE PROGRAMMING ACCURACY:
±0.5% of rated output
voltage, typical.
CURRENT PROGRAMMING ACCURACY:
±1.0% of rated
output current, typical.
VOLTAGE READBACK ACCURACY:
±1.0% of maximum
monitor voltage.
CURRENT READBACK ACCURACY:
±1.0% of maximum
monitor voltage.
ISOLATION:
Programming and readback lines:
Non‑isolated I/O Lines:
500V, with respect to chassis
potential.
Isolated I/O Lines:
600V, with respect to chassis potential.
1500V, to either output.
SHUTDOWN CONTROL (isolated input)
16
:
Shutdown can be
programmed either on logic high or logic low; dry contact
compatible.
Logic Low:
0V to 1.4V.
Logic High:
2V to 15V.
AUXILIARY OUTPUT ON/OFF CONTROL (isolated output):
TTL level or dry-contact compatible.
On:
TTL high.
Off:
TTL low.
POWER SUPPLY STATUS SIGNAL (isolated output):
OK:
TTL high (4V to 5V).
Fail:
TTL low (0V to 0.6V).
INTERLOCK ENABLE/DISABLE (isolated input line):
Dry contact; open/short: On or off, programmable.
CONSTANT VOLTAGE (CV) AND CONSTANT CURRENT (CC)
INDICATOR (non‑isolated output):
CV:
TTL high (4V to 5V).
CC:
TTL low (0V to 0.6V).
ACCURACY AND RESOLUTION
Model
Accuracy
Voltage Programming
9
Current Programming
10
Power Programming
11
Voltage Readback
9
Current Readback
10
Power Readback
11
Meter Accuracy
Resolution
12
Voltage Programming
Current Programming
Power Programming
Voltage Readback
Current Readback
Power Readback
2268-20-42 2268-40-21 2268-60-14 2268-80-10 2268-100-8 2268-150-5
±20 mV
±84 mA
±2.52 W
±20 mV
±84 mA
±2.52 W
±40 mV
±60 mV
±80 mV
±100 mV
±42 mA
±28 mA
±21 mA
±17 mA
±2.52 W
±2.52 W
±2.52 W
±2.55 W
±40 mV
±60 mV
±80 mV
±100 mV
±42 mA
±28 mA
±21 mA
±17 mA
±2.52 W
±2.52 W
±2.52 W
±2.55 W
0.5% of output voltage or current ±1 count
4.8 mV
2.52 mA
102 mW
4.8 mV
2.52 mA
100.8 mW
7.2 mV
1.68 mA
102 mW
7.2 mV
1.68 mA
100.8 mW
9.6 mV
1.26 mA
102 mW
9.6 mV
1.26 mA
100.8 mW
12 mV
1.02 mA
102 mW
12 mV
1.02 mA
102 mW
±150 mV
±11.2 mA
±2.52 W
±150 mV
±11.2 mA
±2.52 W
Series 2268 specifications
2.4 mV
5.04 mA
102 mW
2.4 mV
5.04 mA
100.8 mW
18 mV
0.67 mA
102 mW
18 mV
0.67 mA
100.8 mW
TIMING
Response time
(by model)
2268-20-42 2268-40-21 2268-60-14 2268-80-10 2268-100-8 2268-150-5
13
60 ms
60 ms
60 ms
100 ms
100 ms
100 ms
Up‑programming, 0~Vmax
50 ms
50 ms
50 ms
80 ms
100 ms
150 ms
Down‑programming, full load
600 ms
800 ms
900 ms
1000 ms
1200 ms
1800 ms
Down‑programming, no load
OUTPUT HOLD‑UP TIME:
Typical 20ms at any rated input line.
TRANSIENT RESPONSE TIME
14
:
Less than 1ms for 20V, 40V, and 60V models. Less than 2ms for 80V, 100V, and 150V models.
DATA READBACK TRANSFER TIME
15
:
3ms.
PROGRAMMING AND READBACK TIME:
<300ms (time from sending command to getting readback voltage and current).
Rear panel of the 2268-20-42 and 2268-40-21 showing the bar output connectors
and all analog and digital interface connectors.
DC POWER SUPPLIES
Rear panel of the 60V and higher voltage versions showing the terminal block
output connectors and all analog and digital interface connectors.
1.888.KEITHLEY
(U.S. only)
www.keithley.com
A Greater Measure of Confidence
Series 2268 specifications
Series 2268
850W DC Power Supplies
NOTES
1. When setting 0V, using either the front panel or digital remote programming, the maximum output voltage is
≤0.2%
of the rated output voltage.
2. When setting 0A, using either the front panel or digital remote programming, the maximum output current is
≤0.4%
of the rated output current.
3. Maximum Output Power is the sum of: (Maximum Output Voltage × Maximum Output Current) + 10W. The 10W
is the maximum power output from the two auxiliary outputs, AUX1 (5V × 0.5A) and AUX2 (15V 0.5A).
4. From 85VAC to 132VAC or 170VAC to 265VAC, constant load.
5. From no load to full load, constant input voltage.
6. Voltage change is rated output voltage, constant input voltage.
7. Measured at 10% to 100% output voltage and full output current.
8. When using remote sense, the total of the load voltage and the load line drops must not exceed the rated
output of the power supply.
9. Calculation: ±0.1% of output voltage specification.
10. Calculation: ±0.2% of output current specification.
11. Calculation: ±0.3% of output power specification.
12. Calculation: 0.012% of full scale parameter.
13. With rated, resistive load.
14. Time for the output voltage to recover within 0.5% at its rated output for a load change 10% to 90% of rated
output current. Output set point 10% to 100%.
15. Time to provide data back to the controller using the LAN interface (does not include A/D conversion time).
16. The shutdown input has user-selectable negative logic operation from the front panel or remote digital input/
output.
17. At maximum output power.
18. Current: 0.51A minimum guaranteed, 0.72A typically available. The maximum current with these outputs
shorted is limited to 0.4A. Over-current protection (each output) is automatic, non-latching. When over-current
protection (OCP) is tripped, the auxiliary voltage folds back and will recover to nominal condition when
the over-current condition is removed (typical <0.2A). To protect external circuits attached to the auxiliary
outputs, use an appropriately rated fuse in series with the auxiliary outputs in use.
19. Double insulation on primary to secondary isolation barriers. Basic insulation primary to protective
earth ground.
GENERAL CHARACTERISTICS
PARALLEL OPERATION:
Up to 4 instruments in a master/slave configuration.
SERIES OPERATION:
Up to 2 instruments (with external diodes).
POWER SUPPLY RATED AC INPUT VOLTAGE/FREQUENCY:
100VAC to 240VAC, 47Hz to
63Hz.
OPERATIONAL AC INPUT VOLTAGE/FREQUENCY:
85VAC to 265VAC, continuous, sin-
gle-phase, 47Hz to 63Hz, 360Hz to 440Hz.
INPUT CURRENT (100/200VAC):
11.5/6A (850W).
INPUT POWER:
1100VA.
INRUSH CURRENT (100/200VAC):
<25A (850W).
POWER FACTOR CORRECTION:
0.99 at 100/200VAC, rated output power.
EFFICIENCY
17
(100/200VAC input):
Model 2268-20-42: 82/85%. All other models: 83/87%.
TEMPERATURE COEFFICIENT:
100ppm/°C from rated output voltage, after a 30-minute
warm-up period.
DRIFT (8 hours):
0.05% of rated output (over an 8-hour interval with constant line, load,
and temperature, after a 30-minute warm-up period).
AUXILIARY OUTPUTS (2)
18
:
+5V; 0.5 A maximum recommended load current.
+15 V: 0.5 A maximum recommended load current.
ISOLATION
19
:
1500VAC or 2121VDC between mains terminals and accessible conductive
parts/chassis ground; output to chassis 500VAC.
DIGITAL INTERFACES:
RS‑232:
57.6 Kbps maximum data rate.
RS‑485:
57.6 Kbps maximum data rate.
LAN:
100-BaseT.
USB:
USB 2.0.
GPIB:
IEEE-488.2.
REAR‑PANEL CONNECTORS:
Power output connectors
2268‑20‑42, 2268‑40‑21:
Terminal bars with 6.5 mm (0.039 in.) diameter holes.
All Other Models:
Terminal blocks.
Analog I/O Connector:
18-pin terminal block.
Isolated Analog I/O and Auxiliary Output Connector:
15-pin D-sub connector.
GPIB connector:
21-pin, female connector.
USB:
USB 2.0 device.
RS‑232/RS‑485 and RS‑485 connectors:
8-pin, RJ-45 jack.
COOLING:
Forced air cooling by internal fans.
OPERATING TEMPERATURE RANGE:
0° to 50°C, 100% load.
STORAGE TEMPERATURE RANGE:
–20° to 70°C.
OPERATING HUMIDITY RANGE:
30% to 90% relative humidity (no condensation).
STORAGE HUMIDITY RANGE:
10% to 95% relative humidity (no condensation).
OPERATING ALTITUDE:
Up to 2000m (6500 ft).
INSTALLATION CATEGORY:
II (IEC 1010-1).
POLLUTION DEGREE:
2 (IEC 1010-1).
SAFETY:
CSA 22.2 No. 61010-1, 60950-1-07 and UL61010-1 and UL60950-1 (2nd ed.)
19
. Marked
with cCSAus, CE for EMC and European Union Low Voltage Directive.
EMC:
Conforms with European Union Low Voltage Directive.
DIMENSIONS:
44 mm high × 214 mm wide × 495 mm deep (1.72 in. × 8.43 in. × 19.48 in.).
WEIGHT:
5 kg (11 lb).
WARRANTY:
Three (3) years.
Series 2268 Accessories
1.888.KEITHLEY
(U.S. only)
www.keithley.com
A Greater Measure of Confidence
DC POWER SUPPLIES
Series 2268 Accessories
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