2268-RMK-2 - KEITHLEY - Product.Network

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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.

• 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

Series 2268

850W DC Power Supplies

APPLICATIONS

• Production testing

• Environmental testing

• Accelerated life testing

• Process control systems

3-Year

Warranty

Safety Limit

Switches

Control Relay

Interlock

Series 2268

DC Power Supply

Aux Out

15V

Aux Out

Output –

Output + DUT or

Load

Fixture

Control

Sensors Isolated

Analog

Input

PLC

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.

850W DC power supplies

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Series 2268

850W DC Power Supplies

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.

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

ACCESSORIES AVAILABLE

2268-HDR Hardware to Connect Test Lead Lugs to the

2268-20-42 or 2268-40-21

2268-RMK-1 Rack Mount Kit for One Series 2268 DC

Power Supply

2268-RMK-2 Rack Mount Kit for Two Series 2268 DC

Power Supplies

USB-1-1 USB Cable

CA-180-3A Ethernet Crossover Cable

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

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

USB port

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)

PC Power Supply #1

Out

RS-485

Out

LAN, USB, GPIB,

RS-485, RS-232 Power Supply #2

Power Supply #30

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.

850W DC power supplies

DC POWER SUPPLIES

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Series 2268 850W DC Power Supplies

SERVICES AVAILABLE

Model Number*-EW 1 additional year of factory warranty

Model Number-5Y-EW 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.

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

Maximum Output Voltage120 V 40 V 60 V 80 V 100 V 150 V

Maximum Output Current242 A 21 A 14 A 10.5 A 8.5 A 5.6 A

Maximum Output Power3850 W 850 W 850 W 850 W 860 W 850 W

Line Regulation (% of rated output + offset)

Voltage (0.005% + 2mV)43.0 mV 4 mV 5 mV 6 mV 7 mV 9.5 mV

Current (0.01% + 1mA)4 5.2 mA 3.1 mA 2.4 mA 2.1 mA 1.9 m A 1.6 mA

Load Regulation (% of rated output + offset)

Voltage (0.005% + 2mV)53.0 mV 4 mV 5 mV 6 mV 7 mV 9.5 mV

Current (0.02% + 4mA)612.4 mA 8.2 mA 6.8 mA 6.1 mA 5.7 m A 5.1 mA

Output Noise (RMS, 300kHz)

Voltage 8 mV 8 mV 8 mV 8 mV 8 mV 10 mV

Current775 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

Maximum recommended remote sense line drop compensation per line8

1.5 V 2 V 3 V 5 V 5 V 5 V

Protection

Over-voltage trip point

range 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

Over-voltage trip-point

accuracy ±0.24 V ±0.44 V ±0.66 V ±0.95 V ±1.25 V ±1.80 V

Over-voltage programming

resolution 2.9 mV 5.3 mV 8 mV 11.4 mV 15 mV 21.6 mV

Over-current program

setpoint range 0% to 105% of rated current

850W DC power supplies

DC POWER SUPPLIES

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A Greater Measure of Conﬁdence

Series 2268 850W DC Power Supplies

ACCURACY AND RESOLUTION

Model 2268-20-42 2268-40-21 2268-60-14 2268-80-10 2268-100-8 2268-150-5

Accuracy

Voltage Programming9±20 mV ±40 mV ±60 mV ±80 mV ±100 mV ±150 mV

Current Programming10 ±84 mA ±42 mA ±28 mA ±21 mA ±17 m A ±11.2 mA

Power Programming11 ±2.52 W ±2.52 W ±2.52 W ±2.52 W ±2.55 W ±2.52 W

Voltage Readback9±20 mV ±40 mV ±60 mV ±80 mV ±100 mV ±150 mV

Current Readback10 ±84 mA ±42 mA ±28 mA ±21 mA ±17 m A ±11.2 mA

Power Readback11 ±2.52 W ±2.52 W ±2.52 W ±2.52 W ±2.55 W ±2.52 W

Meter Accuracy 0.5% of output voltage or current ±1 count

Resolution12

Voltage Programming 2.4 mV 4.8 mV 7.2 mV 9.6 mV 12 mV 18 mV

Current Programming 5.04 mA 2.52 mA 1.68 mA 1.26 mA 1.02 mA 0.67 mA

Power Programming 102 mW 102 mW 102 mW 102 mW 102 mW 102 mW

Voltage Readback 2.4 mV 4.8 mV 7.2 mV 9.6 mV 12 mV 18 mV

Current Readback 5.04 mA 2.52 mA 1.68 mA 1.26 mA 1.02 mA 0.67 mA

Power Readback 100.8 mW 100.8 mW 100.8 mW 100.8 mW 102 mW 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

Up‑programming, 0~Vmax13 60 ms 60 ms 60 ms 100 ms 100 ms 100 ms

Down‑programming, full load 50 ms 50 ms 50 ms 80 ms 100 ms 150 ms

Down‑programming, no load 600 ms 800 ms 900 ms 1000 ms 1200 ms 1800 ms

OUTPUT HOLD‑UP TIME: Typical 20ms at any rated input line.

TRANSIENT RESPONSE TIME14: Less than 1ms for 20V, 40V, and 60V models. Less than 2ms for 80V, 100V, and 150V models.

DATA READBACK TRANSFER TIME15: 3ms.

PROGRAMMING AND READBACK TIME: <300ms (time from sending command to getting readback voltage and current).

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).

Rear panel of the 2268-20-42 and 2268-40-21 showing the bar output connectors

and all analog and digital interface connectors.

Rear panel of the 60V and higher voltage versions showing the terminal block

output connectors and all analog and digital interface connectors.

Series 2268 specifications

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Series 2268 850W DC Power Supplies

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.

EFFICIENCY17 (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.

ISOLATION19: 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.

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.

Series 2268 Accessories

DC POWER SUPPLIES

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.

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