Keithley Keithley Instruments 2303 Manual

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Model 2303/2303B/2303-PJ

High Speed Power Supply User’s Manual

A GREATER MEASURE OF CONFIDENCE

5/03

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

User’s Manual

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.

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

Revision

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.

afety Precautions

The following safety precautions should be observ 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 is the individual or group responsible for the use and maintenance of equipment, for ensuring that the equipment is operated within its speciﬁcations and operating limits, and for ensuring that operators are adequately trained.

Operators use the product for its intended function. They must be trained in electrical safety procedures and proper use of the instrument. They must be protected from electric shock and contact with hazardous live circuits.

Maintenance personnel perform routine procedures on the product to keep it operating properly, for example, setting the line 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 are trained to work on live circuits, and perform safe installations and repairs of products. Only properly 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. A good safety practice is to expect that hazardous voltage is present in any unknown

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, no conductive part of the circuit may be exposed.

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-

ed before using this product and any associated instrumentation. Although

5/03

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

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 heading in a manual explains dangers that might result in personal injury or death. Always read the associated information very carefully before performing the indicated procedure.

The CAUTION heading in a manual explains hazards that could damage the instrument. Such damage may invalidate the warranty.

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.

ving jumpers.

Getting Started

General information ..........................................................................

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

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

1-2

................................................................................ 2-2

3 Pulse Current Measurements

Overvie

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

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

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

w ............................................................................................ 3-2

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

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

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

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

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

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

4 Long Integration Measurements

Overvie

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

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

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

w ............................................................................................ 4-2

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

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

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

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

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

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

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

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

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

............................................................................ 7-10

8 Common Commands

Overvie

w ............................................................................................ 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

Overvie

w ............................................................................................ 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

Getting Started

High speed power supply

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

2 Basic Power Supply Operation

Typical connections

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

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

3 Pulse Current Measurements

Pulse current measurement ................................................................

5 Relay Control

Relay control .....................................................................................

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

6 GPIB Operation

IEEE-488 connector ..........................................................................

7 Status Structure

Status model structure .......................................................................

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

.................................................................. 1-4

........................................................................... 2-2

3-2

5-3

6-2

7-3

10 DISPlay

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

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

, FORMat, and SYSTem

10-5

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 — Covers general information that includes warranty informa-

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

• Power supply overview — Summarizes the capabilities of the power supply.

• Remote display option — Explains how to use the optional Model 2304-DISP Display

Module.

• Power-up — Covers line power connection, fuse replacement, and the power up

sequence.

• Display modes — Explains the four display modes of the power supply.

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

settings.

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

the menu structure.

• SCPI programming — 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 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.

Speciﬁcations

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

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

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

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.

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.

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)

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.

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. 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)

eferences to front panel messages, menus, and keystrokes apply to the

All r

POWER

A) Front Panel

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

DISPLAY

ISOLATION FROM EARTH:

22 VOLTS MAX.

____

+++

SOURCE SENSE

OUTPUT

15V/3A 9V/5A

IEEE-488

(CHANGE IEEE ADDRESS

WITH FRONT PANEL MENU)

MADE IN

U.S.A.

SOURCE

DVM IN

LOCAL

OPERATE

ENTER

LINE FUSE

SLOWBLOW

2.0A, 250V

LINE RATING

100-120VAC/ 200-240VAC

50, 60 HZ

150VA MAX

SET

RELAY

CONTROL

15VDC MAX

REMOTE DISPLAY

OPTION

B) Rear Panel

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

range, display resolution is 100µA, 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 100µA, and on the 500mA range, resolution is 0.01mA (10µA).

The power supply also has a digital v

oltmeter (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

Source

I meter

V-Source with I-Limit

V meter

DVM

Digital

Voltmeter

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.

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

Model 2303.

The remote display module plugs into the rear panel connector labeled “REMOTE DISPLAY OPTION” (see Figure 1-1B). following message displayed:

REMOTE PANEL

ENABLED

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

NOTE When connecting or disconnecting the 2304-DISP remote display, allow a few sec-

onds for the power supply to reco nects 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.

When plugged in, the main display module is disabled with the

gnize the action. Fast, repeated connects/discon-

Power-up

Line power connection

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.

CAUTION

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

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.

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

Power-up sequence

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

NOTE

output off (see “Default settings”).

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

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

Top line

• factory, the address is set to 16.

•

Bottom line

play board. Also displayed is the detected line frequency.

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

— 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 def

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

of the power supply

• PULSE CURRENT — This mode is used to display high, lo

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 inte

A display mode is selected as follows:

1. Press the DISPLAY key and use the 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 pulse average. Examples of the display modes are shown as follows:

ault. (See Section 2 for details.)

. (See Section 2 for details.)

w, or average pulse-current

gration method. (See Section 4 for details.)



or  key to display the desired mode: ACTUAL

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



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

PULSE LO ON

0.2147 A

PULSE AVG ON

1.1495 A

Long integration: LONG INT ON

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

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

Pulse current: High time 33 µsec Low time 33 µsec

and Exponential)

to zero)

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

0.0000A

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

The setup MENU items are explained as follows:

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

f) or SA

V4.

ed setups; SAV0-SAV4. Note the operate state (output) is always recalled

V5-SAV9 (output on or off). Note that SAV5-SAV9 are not available for the

SAV0-SA

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

of the user sa as OFF.

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

of Model 2303-PJ.

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.

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

Models 2303, 2303B and 2303PJ:

V0 (output of SAV1 (output off) SAV2 (output off) SAV3 (output off) SAV4 (output off)

Models 2303 and 2303B:

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). — F

or 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

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.

Figure 2-1

Typical connections

Disconnect

(Part # CS-846)

DVM Input

Output

DVM +

DVM Source -

Source -

Sense -

Sense +

Source +

Quick

Connector

External

Test

Circuitry

DUT

+ 122 hidden pages

Keithley Keithley Instruments 2303 Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Table of Contents

List of Illustrations

List of Tables

Getting Started

General information

Power supply overview

Remote display option

Power-up

Display modes

Default settings

Menu

SCPI programming

Basic Power Supply Operation

Test connections