Keithley 2303, 2303B, 2303-PJ User Manual

Model 2303/2303B/2303-PJ

High Speed Power Supply
User’s Manual

A GREATER MEASURE OF CONFIDENCE

WARRANTY

Keithley Instruments, Inc. warrants this product to be free from defects in material and workmanship for a
period of 2 years from date of shipment.

Keithley Instruments, Inc. warrants the following items for 90 days from the date of shipment: probes, cables,
rechargeable batteries, diskettes, and documentation.

During the warranty period, we will, at our option, either repair or replace any product that proves to be defective.

To exercise this warranty, write or call your local Keithley representative, or contact Keithley headquarters in
Cleveland, Ohio. You will be given prompt assistance and return instructions. Send the product, transportation
prepaid, to the indicated service facility. Repairs will be made and the product returned, transportation prepaid.
Repaired or replaced products are warranted for the balance of the original warranty period, or at least 90 days.

LIMITATION OF WARRANTY

This warranty does not apply to defects resulting from product modification without Keithley’s express written
consent, or misuse of any product or part. This warranty also does not apply to fuses, software, non-rechargeable
batteries, damage from battery leakage, or problems arising from normal wear or failure to follow instructions.

THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUD­ING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE.
THE REMEDIES PROVIDED HEREIN ARE BUYER’S SOLE AND EXCLUSIVE REMEDIES.

NEITHER KEITHLEY INSTRUMENTS, INC. NOR ANY OF ITS EMPLOYEES SHALL BE LIABLE FOR
ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF
THE USE OF ITS INSTRUMENTS AND SOFTWARE EVEN IF KEITHLEY INSTRUMENTS, INC., HAS
BEEN ADVISED IN ADVANCE OF THE POSSIBILITY OF SUCH DAMAGES. SUCH EXCLUDED DAM­AGES SHALL INCLUDE, BUT ARE NOT LIMITED TO: COSTS OF REMOVAL AND INSTALLATION,
LOSSES SUSTAINED AS THE RESULT OF INJURY TO ANY PERSON, OR DAMAGE TO PROPERTY.

Keithley Instruments, Inc.

28775 Aurora Road • Cleveland, Ohio 44139 • 440-248-0400 • Fax: [phone]

1-888-KEITHLEY (534-8453) • www.keithley.com

Sales Offices: BELGIUM:

Bergensesteenweg 709 • B-1600 Sint-Pieters-Leeuw • 02-363 00 40 • Fax: [phone]

CHINA:

Yuan Chen Xin Building, Room 705 • 12 Yumin Road, Dewai, Madian • Beijing 100029 • 8610-82251886 • Fax: [phone]

FINLAND:

Halsuantie 2 • 00420 Helsinki, Finland • 09-53 06 65 60 • Fax: [phone]

FRANCE:

3, allée des Garays • 91127 Palaiseau Cédex • 01-64 53 20 20 • Fax: [phone]

GERMANY:

Landsberger Strasse 65 • 82110 Germering • 089-84 93 07-40 • Fax: [phone]

GREAT BRITAIN:

Unit 2 Commerce Park, Brunel Road • Theale, Berkshire RG7 4AB • 0118 -929 75 00 • Fax: [phone]

INDIA:

1/5, Eagles Street • Langford Town • Bangalore 560 025 • 080 212 80-27 • Fax: [phone]

ITALY:

Viale San Gimignano, 38 • 20146 Milano • 02-48 39 16 01 • Fax: [phone]

JAPAN:

New Pier Takeshiba North Tower 13F • 11-1, Kaigan 1-chome • Minato-ku, Tokyo 105-0022 • 81-3-5733-7555 • Fax: [phone]

KOREA: 2FL., URI Building • 2-14 Yangjae-Dong • Seocho-Gu, Seoul 137-888 • 82-2-574-7778 • Fax: [phone]
NETHERLANDS: Postbus 559 • 4200 AN Gorinchem • 0183-63 53 33 • Fax: [phone]
SWEDEN: c/o Regus Business Centre • Frosundaviks Allé 15, 4tr • 16970 Solna • 08-50 90 46 00 • Fax: [phone]
TAIWAN: 13F-3, NO. 6, Lane 99, Pu-Ding Road, Hsinchu, Taiwan, ROC. • 886-3-572-9077• Fax: [phone]

5/03

Model 2303/2303B/2303-PJ High Speed Power Supply

User’s Manual

©1998, Keithley Instruments, Inc.

All rights reserved.

Cleveland, Ohio, U.S.A.

Sixth Printing, August 2003

Document Number: 2303-900-01 Rev. F

Manual Print History

The print history shown below lists the printing dates of all Revisions and Addenda created
for this manual. The Revision Level letter increases alphabetically as the manual undergoes sub­sequent updates. Addenda, which are released between Revisions, contain important change in­formation that the user should incorporate immediately into the manual. Addenda are numbered
sequentially. When a new Revision is created, all Addenda associated with the previous Revision
of the manual are incorporated into the new Revision of the manual. Each new Revision includes
a revised copy of this print history page.

Revision A (Document Number 2303-900-01) ............................................................January 1998

Revision B (Document Number 2303-900-01) .......................................................... February 1998

Revision C (Document Number 2303-900-01) ............................................................. August 1998

Revision D (Document Number 2303-900-01)........................................................November 1999

Addendum D (Document Number 2303-900-02) ........................................................October 2000

Revision E (Document Number 2303-900-01) ............................................................October 2000

Revision F (Document Number 2303-900-01).............................................................. August 2003

All Keithley product names are trademarks or registered trademarks of Keithley Instruments, Inc.
Other brand names are trademarks or registered trademarks of their respective holders.

S

The following safety precautions should be observed before using this product and any associated instrumentation. Although
some instruments and accessories would normally be used with non-hazardous voltages, there are situations where hazardous
conditions may be present.

This product is intended for use by qualified personnel who recognize shock hazards and are familiar with the safety precautions
required to avoid possible injury. Read and follow all installation, operation, and maintenance information carefully before us­ing the product. Refer to the manual for complete product specifications.

If the product is used in a manner not specified, the protection provided by the product may be impaired.

The types of product users are:

Responsible body

ment is operated within its specifications and operating limits, and for ensuring that operators are adequately trained.

Operators

instrument. They must be protected from electric shock and contact with hazardous live circuits.

Maintenance personnel

voltage or replacing consumable materials. Maintenance procedures are described in the manual. The procedures explicitly state
if the operator may perform them. Otherwise, they should be performed only by service personnel.

Service personnel

trained service personnel may perform installation and service procedures.

Keithley products are designed for use with electrical signals that are rated Measurement Category I and Measurement Category
II, as described in the International Electrotechnical Commission (IEC) Standard IEC 60664. Most measurement, control, and
data I/O signals are Measurement Category I and must not be directly connected to mains voltage or to voltage sources with
high transient over-voltages. Measurement Category II connections require protection for high transient over-voltages often as­sociated with local AC mains connections. Assume all measurement, control, and data I/O connections are for connection to
Category I sources unless otherwise marked or described in the Manual.

Exercise extreme caution when a shock hazard is present. Lethal voltage may be present on cable connector jacks or test fixtures.
The American National Standards Institute (ANSI) states that a shock hazard exists when voltage levels greater than 30V RMS,

42.4V peak, or 60VDC are present.

circuit before measuring.

Operators of this product must be protected from electric shock at all times. The responsible body must ensure that operators
are prevented access and/or insulated from every connection point. In some cases, connections must be exposed to potential
human contact. Product operators in these circumstances must be trained to protect themselves from the risk of electric shock.
If the circuit is capable of operating at or above 1000 volts,

Do not connect switching cards directly to unlimited power circuits. They are intended to be used with impedance limited sourc­es. NEVER connect switching cards directly to AC mains. When connecting sources to switching cards, install protective de­vices to limit fault current and voltage to the card.

Before operating an instrument, make sure the line cord is connected to a properly grounded power receptacle. Inspect the con­necting cables, test leads, and jumpers for possible wear, cracks, or breaks before each use.

When installing equipment where access to the main power cord is restricted, such as rack mounting, a separate main input pow­er disconnect device must be provided, in close proximity to the equipment and within easy reach of the operator.

For maximum safety, do not touch the product, test cables, or any other instruments while power is applied to the circuit under
test. ALWAYS remove power from the entire test system and discharge any capacitors before: connecting or disconnecting ca-

use the product for its intended function. They must be trained in electrical safety procedures and proper use of the

is the individual or group responsible for the use and maintenance of equipment, for ensuring that the equip-

perform routine procedures on the product to keep it operating properly, for example, setting the line

are trained to work on live circuits, and perform safe installations and repairs of products. Only properly

afety Precautions

A good safety practice is to expect that hazardous voltage is present in any unknown

no conductive part of the circuit may be exposed.

5/03

bles or jumpers, installing or removing switching cards, or making internal changes, such as installing or removing jumpers.

Do not touch any object that could provide a current path to the common side of the circuit under test or power line (earth) ground. Al­ways make measurements with dry hands while standing on a dry, insulated surface capable of withstanding the voltage being measured.

The instrument and accessories must be used in accordance with its specifications and operating instructions or the safety of the
equipment may be impaired.

Do not exceed the maximum signal levels of the instruments and accessories, as defined in the specifications and operating in­formation, and as shown on the instrument or test fixture panels, or switching card.

When fuses are used in a product, replace with same type and rating for continued protection against fire hazard.

Chassis connections must only be used as shield connections for measuring circuits, NOT as safety earth ground connections.

If you are using a test fixture, keep the lid closed while power is applied to the device under test. Safe operation requires the use
of a lid interlock.

If a screw is present, connect it to safety earth ground using the wire recommended in the user documentation.

!

The symbol on an instrument indicates that the user should refer to the operating instructions located in the manual.

The symbol on an instrument shows that it can source or measure 1000 volts or more, including the combined effect of
normal and common mode voltages. Use standard safety precautions to avoid personal contact with these voltages.

The symbol indicates a connection terminal to the equipment frame.

The

WARNING

information very carefully before performing the indicated procedure.

The

CAUTION

ranty.

Instrumentation and accessories shall not be connected to humans.

Before performing any maintenance, disconnect the line cord and all test cables.

To maintain protection from electric shock and fire, replacement components in mains circuits, including the power transformer,
test leads, and input jacks, must be purchased from Keithley Instruments. Standard fuses, with applicable national safety ap­provals, may be used if the rating and type are the same. Other components that are not safety related may be purchased from
other suppliers as long as they are equivalent to the original component. (Note that selected parts should be purchased only
through Keithley Instruments to maintain accuracy and functionality of the product.) If you are unsure about the applicability
of a replacement component, call a Keithley Instruments office for information.

To clean an instrument, use a damp cloth or mild, water based cleaner. Clean the exterior of the instrument only. Do not apply
cleaner directly to the instrument or allow liquids to enter or spill on the instrument. Products that consist of a circuit board with
no case or chassis (e.g., data acquisition board for installation into a computer) should never require cleaning if handled accord­ing to instructions. If the board becomes contaminated and operation is affected, the board should be returned to the factory for
proper cleaning/servicing.

heading in a manual explains dangers that might result in personal injury or death. Always read the associated

heading in a manual explains hazards that could damage the instrument. Such damage may invalidate the war-

Table of Contents

1 Getting Started

General information .......................................................................... 1-2

Warranty information....................................................................... 1-2

Contact information ....................................................................... 1-2

Safety symbols and terms .............................................................. 1-2

Specifications ................................................................................. 1-2

Inspection ....................................................................................... 1-3

Options and accessories ................................................................. 1-3

Power supply overview ..................................................................... 1-4

Remote display option ....................................................................... 1-6

Power-up ............................................................................................ 1-6

Line power connection .................................................................. 1-6

Fuse replacement ........................................................................... 1-7

Power-up sequence ........................................................................ 1-7

Display modes ................................................................................... 1-8

Default settings .................................................................................. 1-9

Setups — Save, Power-on, and Recall ......................................... 1-10

Menu ................................................................................................ 1-11

Rules to navigate MENU ............................................................. 1-13

SCPI programming .......................................................................... 1-13

2 Basic Power Supply Operation

Test connections ................................................................................ 2-2

Outputting voltage and current .......................................................... 2-3

Setting output voltage and current limit ........................................ 2-3

Operate ........................................................................................... 2-8

SCPI programming — outputting voltage and current .................. 2-8

Reading back V and I ...................................................................... 2-11

Actual V and I display mode ........................................................ 2-11

Measurement configuration .......................................................... 2-11

SCPI programming — measure V and I, and DVM input ........... 2-12

Independent voltage measurements (DVM) .................................... 2-13

DVM input display mode ............................................................. 2-13

Measurement configuration .......................................................... 2-13

SCPI programming — DVM........................................................ 2-13

Sink operation ................................................................................. 2-14

Programming examples.................................................................... 2-15

Outputting and reading back V and I............................................ 2-15

DVM measurements ..................................................................... 2-15

3 Pulse Current Measurements

Overview ............................................................................................ 3-2

Trigger level ................................................................................... 3-3

Trigger delay .................................................................................. 3-3

Integration times ............................................................................ 3-3

Average readings count ..................................................................... 3-3

Measurement configuration ............................................................... 3-4

Current range .................................................................................. 3-4

Integration times ............................................................................ 3-4

Average readings count .................................................................. 3-5

Trigger delay and trigger level ........................................................ 3-5

Pulse current display mode ............................................................. 3-5

Pulse current measurement procedure ............................................ 3-6

Determining correct trigger level (pulse current) ........................... 3-6

SCPI programming ............................................................................. 3-7

Pulse current digitization ................................................................ 3-9

Programming examples ................................................................ 3-10

4 Long Integration Measurements

Overview ............................................................................................ 4-2

Integration time .............................................................................. 4-3

Trigger edge .................................................................................... 4-3

Trigger level ................................................................................... 4-3

Pulse timeout .................................................................................. 4-4

Measurement configuration ............................................................... 4-5

Current range .................................................................................. 4-5

Integration time ............................................................................... 4-5

Pulse timeout .................................................................................. 4-6

Trigger edge and trigger level ........................................................ 4-6

Long integration display mode ....................................................... 4-7

Long integration measurement procedure ........................................ 4-7

General notes .................................................................................. 4-8

Determining correct trigger level (long integration)....................... 4-8

SCPI programming ............................................................................ 4-9

Programming example .................................................................. 4-11

5 Relay Control

Overview ........................................................................................... 5-2

Connections ....................................................................................... 5-4

Controlling the relay .......................................................................... 5-5

SCPI programming ........................................................................ 5-5

6 GPIB Operation

Introduction ....................................................................................... 6-2

GPIB bus connections ....................................................................... 6-2

Primary address ................................................................................. 6-3

Output format .................................................................................... 6-3

General bus commands ..................................................................... 6-4

REN (remote enable) ..................................................................... 6-4

IFC (interface clear) ....................................................................... 6-4

LLO (local lockout) ....................................................................... 6-5

GTL (go to local) ........................................................................... 6-5

DCL (device clear) ........................................................................ 6-5

SDC (selective device clear) .......................................................... 6-5

GET (group executive trigger) ....................................................... 6-5

SPE, SPD (serial polling) .............................................................. 6-5

Front panel aspects of GPIB operation ............................................. 6-6

Remote indicator and LOCAL key ................................................ 6-6

Error and status messages .............................................................. 6-6

Programming syntax ......................................................................... 6-7

Command words ............................................................................ 6-7

Program messages ....................................................................... 6-10

Response messages ...................................................................... 6-12

Message exchange protocol ......................................................... 6-12

7 Status Structure

Overview ........................................................................................... 7-2

Status byte and SRQ ...................................................................... 7-2

Status register sets .......................................................................... 7-2

Queues ........................................................................................... 7-2

Clearing registers and queues ............................................................ 7-4

Programming and reading registers ................................................... 7-5

Programming enable registers ....................................................... 7-5

Reading registers ........................................................................... 7-5

Status byte and service request (SRQ) .............................................. 7-6

Status byte register ......................................................................... 7-7

Service request enable register ...................................................... 7-7

Serial polling and SRQ .................................................................. 7-8

Status byte and service request commands .................................... 7-9

Status register sets ............................................................................ 7-10

Register bit descriptions ............................................................... 7-10

Condition registers ....................................................................... 7-15

Event registers .............................................................................. 7-15

Event enable registers .................................................................. 7-16

Programming example — program and read

measurement event register .................................................... 7-17

Queues ............................................................................................. 7-17

Output queue ................................................................................ 7-17

Error queue ................................................................................... 7-18

8 Common Commands

Overview ............................................................................................ 8-2

*IDN? — identification query ........................................................ 8-3

*OPC — operation complete ......................................................... 8-3

*OPC? — operation complete query ............................................. 8-3

*SAV <NRf> — save ..................................................................... 8-4

*RCL <NRf> — recall ................................................................... 8-4

*RST — reset ................................................................................. 8-4

*TRG — trigger ............................................................................. 8-4

*TST? — self-test query ................................................................ 8-5

*WAI — wait-to-continue .............................................................. 8-5

9 Signal Oriented Measurement Commands

Overview ............................................................................................ 9-2

:FETCh? ......................................................................................... 9-2

:FETCh:ARRay? ............................................................................ 9-2

:READ? .......................................................................................... 9-3

:READ:ARRay? ............................................................................. 9-3

:MEASure[:<function>]? ............................................................... 9-4

:MEASure:ARRay[:<function>]? .................................................. 9-4

10 DISPlay, FORMat, and SYSTem

DISPlay subsystem .......................................................................... 10-2

:DISPlay:ENABle <b> ................................................................ 10-2

:DISPlay:TEXT:DATA <a> ......................................................... 10-2

:DISPlay:TEXT:STATe <b> ........................................................ 10-3

FORMat subsystem ......................................................................... 10-4

FORMat[:DATA] <type> ............................................................. 10-4

FORMat:BORDer <name> .......................................................... 10-6

:SYSTem subsystem ........................................................................ 10-7

:SYSTem:POSetup <name> ........................................................ 10-7

11 SCPI Tables

SCPI command subsystems reference tables .................................. 11-2

A Specifications

B Error and Status Messages

C Emulation Commands

HP 6632A power supply emulation commands ............................... C-2

Fluke PM2811 power supply emulation commands ........................ C-5

D Emulation Commands

Selecting the 488.1 protocol.............................................................. D-2

Protocol differences............................................................................ D-3

List of Illustrations

1 Getting Started

High speed power supply .................................................................. 1-4

Simplified power supply diagram ...................................................... 1-5

2 Basic Power Supply Operation

Typical connections ........................................................................... 2-2

Output capabilities ............................................................................. 2-3

Sink operation example.................................................................... 2-12

3 Pulse Current Measurements

Pulse current measurement ................................................................ 3-2

5 Relay Control

Relay control ..................................................................................... 5-3

Miniature phono plug ........................................................................ 5-4

6 GPIB Operation

IEEE-488 connector .......................................................................... 6-2

7 Status Structure

Status model structure ....................................................................... 7-3

16-bit status register .......................................................................... 7-5

Status byte and service request .......................................................... 7-6

Standard event status ....................................................................... 7-11

Operation event status ..................................................................... 7-12

Measurement event status ................................................................ 7-13

Questionable event status ................................................................ 7-14

10 DISPlay, FORMat, and SYSTem

IEEE-754 single precision data format ........................................... 10-5

IEEE-754 double precision data format .......................................... 10-6

List of Tables

1 Getting Started

Factory defaults (RST) ...................................................................... 1-9

MENU structure .............................................................................. 1-12

2 Basic Power Supply Operation

Current ranges.................................................................................... 2-4

SCPI commands — outputting voltage and current ........................ 2-7

SCPI commands — measure V and I, and DVM input ................... 2-10

Sink current limits ............................................................................ 2-12

3 Pulse Current Measurements

SCPI commands — pulse current measurements ............................. 3-7

4 Long Integration Measurements

SCPI commands — long integration measurements ........................ 4-9

5 Relay Control

Switchcraft connection accessories ................................................... 5-4

SCPI command — output relay control ............................................ 5-5

6 GPIB Operation

General bus commands ..................................................................... 6-4

7 Status Structure

Common and SCPI commands — reset registers and clear queues .. 7-4

Command commands — status byte and service request

enable registers .................................................................... 7-9

Common and SCPI commands — condition registers ................... 7-15

Common and SCPI commands — event registers .......................... 7-15

Common and SCPI commands — event enable registers ............... 7-16

SCPI commands — error queue ..................................................... 7-19

8 Common Commands

IEEE-488.2 common commands and queries.................................... 8-2

*OPC and *OPC? commands ........................................................... 8-4

9 Signal Oriented Measurement Commands

Signal oriented measurement command summary ........................... 9-2

10 DISPlay, FORMat, and SYSTem

SCPI commands — display ............................................................. 10-2

SCPI commands — data format....................................................... 10-4

SCPI commands — system ............................................................. 10-7

11 SCPI Tables

DISPlay command summary ........................................................... 11-3

FORMat command summary .......................................................... 11-3

OUTPut command summary ........................................................... 11-3

SENSe command summary ............................................................. 11-4

SOURce command summary .......................................................... 11-6

STATus command summary ............................................................ 11-7

SYSTem command summary .......................................................... 11-8

C Emulation Commands

HP commands used to control the power supply .............................. C-2

Fluke commands used to control Model 2303/2303B/2303-PJ ....... C-5

Getting Started

•

General information

tion, contact information, safety symbols and terms, inspection and available options and
accessories.

•

Power supply overview

— Covers general information that includes warranty informa-

— Summarizes the capabilities of the power supply.

1

Remote display option

•
Module.

Power-up

•
sequence.

Display modes

•

Default settings

•
settings.

Menu

•
the menu structure.

SCPI programming

•

— Covers line power connection, fuse replacement, and the power up

— Provides a table that summarizes the menu items and includes rules to navigate

— Explains how to use the optional Model 2304-DISP Display

— Explains the four display modes of the power supply.

— Lists the factory default settings, and explains how to save and recall

— Explains how SCPI commands are presented in this manual.

1-2 Getting Started

General information

Warranty information

Warranty information is located at the front of this manual. Should your power supply require
warranty service, contact the Keithley representative or authorized repair facility in your area for
further information. When returning the instrument for repair, be sure to fill out and include the
service form at the back of this manual to provide the repair facility with the necessary information.

Contact information

If you have any questions after reviewing this information, please contact your local Keithley
representative or call one of our Applications Engineers at 1-800-3735 (U.S. and Canada only).
Worldwide phone numbers are listed at the front of this manual.

Safety symbols and terms

Keithley uses a standard set of safety symbols and terms that may be found on an instrument
or in its manual.

If a screw is present, connect it to safety earth ground using the wire recommended in
the user documentation.

!

The symbol on an instrument indicates that the user should refer to the operating
instructions located in the manual.

The symbol on an instrument shows that it can source or measure 1000 volts or more,
including the combined effect of normal and common mode voltages. Use standard safety pre­cautions to avoid personal contact with these voltages.

The symbol indicates a connection terminal to the equipment frame.

The

WARNING

injury or death. Always read the associated information very carefully before performing the
indicated procedure.

The

CAUTION

ment. Such damage may invalidate the warranty.

heading used in a manual explains dangers that might result in personal

heading used in a manual explains hazards that could damage the instru-

Specifications

Full power supply specifications can be found in Appendix A of this manual.

Inspection

The power supply was carefully inspected electrically and mechanically before shipment.
After unpacking all items from the shipping carton, check for any obvious signs of physical
damage that may have occurred during transit. (Note: There may be a protective film over the
display lens, which can be removed.) Report any damage to the shipping agent immediately.
Save the original packing carton for possible future shipment. The following items are included
with every order:

If an additional manual is required, order the appropriate manual package. The manual pack­age includes a manual and any pertinent addenda.

Getting Started 1-3

• Model 2303/2303B/2303-PJ High Speed Power Supply with line cord

• Quick Disconnect Output/DVM Input Connector

• Accessories as ordered

• Certificate of calibration

• Model 2303/2303B/2303-PJ User’s Manual (P/N 2303-900-00)

• Model 2303/2303B/2303-PJ Service Manual (P/N 2303-902-00)

Any improvements or changes concerning the instrument or manual will be explained in an
addendum included with the manual. Be sure to note these changes and incorporate them into
the manual.

Options and accessories

The following options and accessories are available for the power supply.

• 2304-DISP remote display unit

• Shielded IEEE-488 cable, 1m (3.3 ft) (P/N 7007-1)

• Shielded IEEE-488 cable, 2m (6.6 ft) (P/N 7007-2)

• Single fixed rack mount kit (P/N 4288-1)

• Dual fixed rack mount kit (P/N 4288-2)

• IEEE-488 Interface/controller for the PCI bus (P/N KPCI-488)

• IEEE-488 interface card for IBM PC/AT (full slot) (P/N KPC-488-2AT)

1-4 Getting Started

WARNING:NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY.

WARNING:NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY.

CAUTION:FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.

CAUTION:FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.

Power supply overview

The power supply (shown in Figure 1-1) can output up to +15V at up to 3A or +9V at up to
5A. Voltage can be set in 1mV steps, and current limit can be set in 100µA steps. Maximum
power output is 45W. The power supply can also be used to sink current (up to 2A). As a sink
(current polarity is negative), the power supply is dissipating power rather than sourcing it (see
“Sink operation” for details).

NOTE

Model 2303B has a blank front panel except for a POWER switch and an ON/OFF
LED. All references to front panel messages, menus, and keystrokes apply to the
Models 2303 and 2303-PJ, and the 2303B if using the Model 2304-DISP remote
display module.

Figure 1-1

High speed power supply (Model 2303 shown)

2303 HIGH SPEED POWER SUPPLY 15V/3A 9V/5A

DISPLAY

POWER

A) Front Panel

LOCAL

MENU

ENTER

OPERATE

SET

B) Rear Panel

MADE IN

U.S.A.

ISOLATION FROM EARTH:

22 VOLTS MAX.

____

+++

SOURCE SENSE

(CHANGE IEEE ADDRESS

WITH FRONT PANEL MENU)

OUTPUT

15V/3A 9V/5A

IEEE-488

SOURCE

DVM IN

LINE FUSE

SLOWBLOW

2.0A, 250V

LINE RATING

100-120VAC/
200-240VAC

+

50, 60 HZ

150VA MAX

RELAY

CONTROL

15VDC MAX

REMOTE
DISPLAY

OPTION

Getting Started 1-5

A simplified diagram of the power supply is shown in Figure 1-2. Note that it can read back

the output voltage (V

) and current (I

meter

). Display resolution for voltage readback is 1mV.

meter

Current Readback Ranges:

• Models 2303 and 2303B – Two ranges for current readback: 5A and 5mA. On the 5A

µ

range, display resolution is 100

A, and on the 5mA range, resolution is 0.1µA.

• Model 2303-PJ – Two ranges for current readback: 5A and 500mA. On the 5A range,
display resolution is 100

µ

A, and on the 500mA range, resolution is 0.01mA (10µA).

The power supply also has a digital voltmeter (DVM) that is independent of the power supply

circuit. The DVM can measure up to +20V (1mV resolution).

When used with a pulsed load, the power supply can read back peak current, idle current, and
average current. See Section 3 for details. A long integration (up to 60 seconds) function is pro­vided to measure average current of a low frequency pulse (long period) or a series of pulses.
See Section 4 for details.

Figure 1-2

Simplified power supply diagram

I meter

Source

DVM

V-Source
with I-Limit

Digital

Voltmeter

V meter

+

_

+

_

1-6 Getting Started

Remote display option

If the power supply must be mounted in a location where the display is not readily visible or
the controls are not easily accessible, the optional Model 2304-DISP Display Module can be
used. This display module includes all instrument controls and has a 9 foot cable so the power
supply can be operated remotely from a more convenient location.

Power-up

Line power connection

NOTE

The remote display module plugs into the rear panel connector labeled “REMOTE DISPLAY
OPTION” (see Figure 1-1B). When plugged in, the main display module is disabled with the
following message displayed:

ENABLED

When the remote display module is unplugged, control returns to the main display module.

NOTE

When the remote display is attached to a Model 2303B, the power supply acts like a
Model 2303.

REMOTE PANEL

When connecting or disconnecting the 2304-DISP remote display, allow a few sec­onds for the power supply to recognize the action. Fast, repeated connects/discon­nects of the remote display may cause the power supply to hang or appear to hang.
Disconnecting the remote display and waiting a few seconds to reconnect it may clear
the problem. If not, cycling power on the power supply clears the condition.

The power supply operates from a line voltage in the range of 100 to 240V at a frequency of 50
or 60Hz. Line voltage and frequency are automatically sensed, therefore there are no switches to
set. Check to see that the line power in your area is compatible. Use the :SYSTem :LFRequency?
query (Section 10) to read the line frequency.

Perform the following steps to connect the power supply to the line power and turn it on:

1. Before plugging in the power cord, make sure the front panel power switch is in the off (0)

position.

2. Connect the female end of the supplied power cord to the AC receptacle on the rear panel.

Getting Started 1-7

WARNING

3. Turn on the power supply by pressing the front panel power switch to the on (1) position.

Fuse replacement

A rear panel fuse protects the power line input of the power supply. If the line fuse needs to

be replaced, perform the following steps:

1. The fuse is located in a drawer below the AC receptacle (see Figure 1-1B). At the top of the
fuse drawer is a small tab. At this location, use a thin-bladed knife or screwdriver to pry the
fuse drawer open.

2. Slide the fuse drawer out to gain access to the fuse. Note that the fuse drawer does not pull
all the way out of the power module.

3. Snap the fuse out of the drawer and replace it with the same type (250V, 2.0A, 5
time lag). The Keithley part number is FU-81.

The power cord supplied with the power supply contains a separate ground
for use with grounded outlets. When proper connections are made, instru­ment chassis is connected to power line ground through the ground wire in
the power cord. Failure to use a grounded outlet may result in personal in­jury or death due to electric shock.

×

20mm

CAUTION

4. Push the fuse drawer back into the power module.

For continued protection against fire or instrument damage, only replace
the fuse with the type and rating listed. If the instrument repeatedly blows
fuses, locate and correct the cause of the problem before replacing the fuse.

Power-up sequence

On power-up, the power supply performs self-tests on its EPROM and RAM.

NOTE

If the instrument passes the self-tests, the following information is briefly displayed:

After the power-up sequence, the instrument goes to the presently saved display type with the

output off (see “Default settings”).

If a problem develops while the instrument is under warranty, return it to Keithley
Instruments Inc., for repair.

Top line

•
factory, the address is set to 16.

•

Bottom line

play board. Also displayed is the detected line frequency.

— The model number and the IEEE-488 address are displayed. At the

— Firmware revision levels are displayed for the main board and the dis-

1-8 Getting Started

Display modes

For voltage and current readings, there are four display modes described as follows:

• ACTUAL V AND I —

This display mode is used to read back the actual output voltage

and current. This display mode is the RST default. (See Section 2 for details.)

• DVM INPUT —

of the power supply. (See Section 2 for details.)

• PULSE CURRENT

This mode is used to display the DC voltage applied to the DVM input

— This mode is used to display high, low, or average pulse-current

measurements. (See Section 3 for details.)

• LONG INTEGRATION —

This mode is used to display average current measure-

ments of a pulse or pulses using the long integration method. (See Section 4 for details.)

A display mode is selected as follows:

1. Press the DISPLAY key and use the



or  key to display the desired mode: ACTUAL

V AND I, DVM INPUT, PULSE CURRENT, or LONG INTEGRATION.

2. With the desired mode displayed, press ENTER. Note that after selecting PULSE CUR­RENT, use the

or  key to select the desired pulse measurement: pulse high, pulse low,



or pulse average. Examples of the display modes are shown as follows:

Actual V and I: 6.116 V ON

1.2058 A

DVM input: DVM INPUT ON

4.993 V

Pulse current: PULSE HI ON

2.1947 A

Long integration: LONG INT ON

PULSE LO ON

0.2147 A

PULSE AVG ON

1.1495 A

1.0236 A

Getting Started 1-9

NOTES

“ON” indicates that the output is turned on. With the output turned off, “OFF” is dis­played. See Section 10 for details.

For the Pulse Current and Long Integration display modes, “NO PULSE” is
displayed if the output is off or pulses are not detected (output on). See Sections 3 and
4 for details.

When a change is made that affects the readings being taken, dashes are displayed
instead of readings. The dashes remain until a valid reading for the new condition is
taken.

Any one of the four display modes can be the power-on default. Use the SAVE SETUP
item of the MENU to save the selected display mode in memory, and use the POWER
ON SETUP item to specify the power-on setup (see “Setups” under “Default set­tings” for details).

Default settings

The power supply can be set to power-on to the factory default conditions (RST defaults) or

to user-saved setup conditions. The factory default conditions are listed in Table 1-1.

Table 1-1

Factory defaults (RST)

Setting RST default

Output value settings:
Voltage (V) 0.000V
Current (A) 0.2500A
Output state operate Off
Display type Actual V and I
GPIB address No effect (factory set to 16)
GPIB output format No effect (factory set to Keithley

and Exponential)
Current range 5 amps (Auto Range off)
Integration rate 1.00 PLC
Average readings 1
Power on setup No effect (factory set to RST)
Current limit mode Lim
Output relay No effect (after power cycle, set

to zero)
Pulse current:
High time 33 µsec
Low time 33 µsec

1-10 Getting Started

Table 1-1 (cont.)

Factory defaults (RST)

Setting RST default

Average time 33 µsec
Average readings 1
Trigger delay 0.00000 sec
Trigger level:

Models 2303 and 2303B
Model 2303-PJ:

5A range
500mA range

Long integration:

Integration time 1 second
Pulse timeout 16 seconds
Trigger edge Rising

Trigger level:

Models 2303 and 2303B
Model 2303-PJ:

5A range
500mA range

0.000A

0.000A

0.0000A

0.000A

0.000A

0.0000A

Setups — Save, Power-on, and Recall

Setups are configured by SAVE SETUP, POWER ON SETUP and RECALL SETUP items

of the MENU (which is accessed by pressing the MENU key).

NOTE

The setup MENU items are explained as follows:

When powering up to the SAV0, SAV1, SAV2, SAV3, or SAV4 setup, the output will be off
regardless of the operate state when the setup was saved. For example, if the output is on when
the setup is saved as SAV0, the power supply will power up with the output off for the SAV0
power-on setup.

Table 1-2 shows the menu structure. Rules to navigate the menu follow the table.

SAVE SETUP

•
SAV0-SAV4.

•

RECALL SETUP

of the user saved setups; SAV0-SAV4. Note the operate state (output) is always recalled
as OFF.

•

POWER-ON SETUP

off) or SAV5-SAV9 (output on or off). Note that SAV5-SAV9 are not available for the
Model 2303-PJ.

- Save the present power supply setup to a memory location;

- Return the power supply to the RST defaults (Table 1-1), or to one

- Select the setup to use at power-up; RST, SAV0-SAV4 (output

Getting Started 1-11

If you want the Model 2303 or 2303B to power up with the output on, you must use SAV5,
SAV6, SAV7, SAV8, or SAV9 as the power-on setup. For the SAV5 power-on setup, the power
supply will power up to the SAV0 settings, and the output will be on or off depending on the
output state when the setup was saved as SAV0. For example, assume the output is on and the
setup is saved as SAV0. With SAV0 as the power-on setup, the power supply will power up with
the output off. With SAV5 as the power-on setup, the power supply will power up with the output
on.

Power-On Setups:

NOTE

Models 2303, 2303B and 2303PJ:

SAV0 (output off)

SAV1 (output off)

SAV2 (output off)

SAV3 (output off)

SAV4 (output off)

Models 2303 and 2303B:

SAV5 (SAV0 setup with output on or off)

SAV6 (SAV1 setup with output on or off)

SAV7 (SAV2 setup with output on or off)

SAV8 (SAV3 setup with output on or off)

SAV9 (SAV4 setup with output on or off)

NOTE

SAV5 through SAV9 are not available for the Model 2303-PJ.

For GPIB operation, the setups are saved and recalled using the *SAV, *RCL, and
*RST commands. (See Section 8 for details.) The power-on setup is selected using the
SYSTem:POSetup command (Section 10).

Menu

Many aspects of operation are configured from the menu that is summarized in Table 1-2. Use
the following rules to navigate through the menu structure.

NOTE

The menu key is used to access the menu structure. However, if in remote for IEEE­488 bus operation (“R” displayed below “ON/OFF”) the menu key returns the instru­ment to LOCAL operation.

1-12 Getting Started

Table 1-2
MENU structure

Menu item Description Ref

GPIB menu

Address
Output format

Exponential
2 decimal places
3 decimal places
4 decimal places
Keithley
Fluke

Current range

Integration rate
Average readings
Save setup
Recall setup
Power on setup
Calibrate unit
Current lim mode
Output relay
Revision number
Serial number
Pulse current

High time
Low time
Average time
Auto time
Average readings
Trigger delay
Trigger level

Long integration

Integration time
Auto time
Pulse timeout
Trigger edge
Trigger level

* Models 2303 and 2303B also have SAV5-SAV9.
Notes: 1. See “Default settings” in this section to save and recall setups.

GPIB configuration:

Set primary address (0 to 30).
Select format for GPIB readings:

Return readings in exponent form (i.e. +1.00000000+01).
Return readings using 2 decimal places (i.e. 10.00).
Return readings using 3 decimal places (i.e. 10.000).

Return readings using 4 decimal places (i.e. 10.0000).

Reply with Keithley information to *IDN?
Reply with Fluke information to *IDN?

Select current range:

Models 2303 and 2303B – 5A, 5mA or AUTO.

Model 2303-PJ – 5A, 500mA or AUTO
Set integration rate in NPLC (0.01 to 10).
Set average reading count (1 to 10).
Save present setup in memory (SAV0–SAV4).
Recall setup from memory (RST, SAV0–SAV4).
Select power-on setup (RST, SAV0–SAV4).*
Calibrate Model 2303/2303B/2303-PJ (see Service Manual).
Select current limit mode (Limit, Trip, Limit Relay, or Trig Relay).
Close (ONE) or open (ZERO) relay control circuit.
Display firmware revision levels.
Display serial number of the power supply.
Pulse-current configuration:

Set high time integration rate (in µsec.).

Set low time integration rate (in µsec.).

Set average time integration rate (in µsec.).

Set pulse integration rates automatically.

Set average reading count (1 to 100).

Set trigger delay in seconds (0 to 100msec).

Set trigger level:

Models 2303 and 2303B – 0 to 5A.

Model 2303-PJ: 5A range – 0 to 5A

500mA range – 0 to 500mA.
Long integration configuration:

Manually set integration time (up to 60 sec).

Automatically set integration time.

Set the “NO PULSE” timeout period (1 to 63 sec).

Select trigger edge (rising, falling or neither).

Set trigger level:

Models 2303 and 2303B – 0 to 5A.
Model 2303-PJ: 5A range – 0 to 5A

500mA range – 0 to 500mA.

2. Revision Number displays the firmware revision level for the microcontroller and the display.

3. Serial Number displays the serial number of the power supply.

Sec 6

Sec 2

Sec 2
Sec 2
Note 1
Note 1
Note 1

Sec 2
Sec 5
Note 2
Note 3
Sec 3

Sec 4

Rules to navigate MENU

• The MENU is accessed by pressing the MENU key.

• Use the

 and  edit keys to display the primary menu items.

• A displayed primary menu item is selected by pressing ENTER. With PULSE CUR­RENT or LONG INTEGRATION selected, use the
ondary items and press ENTER to select the displayed item.

• Settings and selections for a menu item are displayed using the edit keys (
— For a setting, use
to increment and decrement the value (unless noted otherwise).
— For a selection, use

• With the desired setting or selection displayed, press ENTER for it to take effect. Press­ing MENU will cancel the edit operation.

• Use the MENU key to back out of the MENU structure.

SCPI programming

SCPI programming information is integrated with front panel operation throughout this man­ual. SCPI commands are listed in tables, and additional information that pertains exclusively to
remote operation is provided after each table. Also, the SCPI tables may reference other sections
of this manual.

Getting Started 1-13

 and  edit keys to display the sec-

,, , and ):

 or  to place the cursor on the appropriate digit, and use  and 

 or  to display the desired option (unless noted otherwise).

NOTE Except for Section 11, all SCPI tables in this manual are abridged. That is, they ex-

clude most optional command words and query commands. Optional command words
and query commands are summarized as follows.

Optional Command Words — In order to be in conformance with the IEEE-488.2 standard,
the power supply accepts optional command words. Any command word that is enclosed in
brackets ([]) is optional and does not have to be included in the program message.

Query commands — Most command words have a query form. A query command is iden­tified by the question mark (?) that follows the command word. A query command requests (que­ries) the programmed status of that command. When a query is sent and the power supply is
addressed to talk, the response message is sent to the computer.

NOTE For complete details, see “Programming syntax” in Section 6.

1-14 Getting Started

2

Basic Power Supply Operation

• Test connections — Explains how to connect the device under test (DUT) to the
power supply output, and how to connect an external voltage to the DVM input.

• Outputting voltage and current — Explains how to output voltage and current.

• Reading back V and I — Covers the Actual V and I display mode, which is used to
measure and display the actual voltage and current being delivered to the DUT.

• Independent voltage measurements (DVM Input) — Explains how to use the
digital voltmeter (DVM) to make DC voltage measurements.

• Sink operation — Explains how to use the power supply to dissipate power, rather
than sourcing it.

• Programming examples — Provides two examples: one to output and read back
voltage and current, and one to measure the DVM input.

2-2 Basic Power Supply Operation

Test connections

WARNING When installing a unit into a test system, make sure the external power

sources do not apply voltage to the power supply in excess of its maximum
limits (see specifications). Failure to do so could result in personal injury or
death.

Test connections to the power supply are made at the rear panel using a quick disconnect
OUTPUT/DVM IN connector (Keithley part number CS-846). Figure 1-1B shows where the
connector plugs in. Use up to #14 AWG wire for the screw terminals of the connector. Once the
connector is wired up, plug it into the rear panel and tighten the captive retaining screws.

Figure 2-1 shows typical power supply connections to the device under test.

NOTE Source I/O terminals are rated up to 10A maximum per pin. Two sets of Source +

and Source - terminals are available. This configuration allows you to wire source
connections in parallel to reduce the effects of wire impedance or to have two sep­arate loads. The two Source + pins and the two Source - pins are internally con­nected to respective terminals on the PC board.

Quick

Disconnect

Connector

(Part # CS-846)

DVM
Input

Output

External

Test

Circuitry

DUT

Sense +

Sense -

Source +

Source -

DVM -

DVM +

Source -

Source +

+

_

Figure 2-1

Typical connections