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.
BELGIUM: Keithley Instruments B.V.
CHINA: Keithley Instruments China
FRANCE: Keithley Instruments Sarl
GERMANY: Keithley Instruments GmbH
GREAT BRITAIN: Keithley Instruments Ltd
INDIA: Keithley Instruments GmbH
ITALY: Keithley Instruments s.r.l.
NETHERLANDS: Keithley Instruments B.V.
SWITZERLAND: Keithley Instruments SA
TAIWAN: Keithley Instruments Taiwan
• 28775 Aurora Road • Cleveland, OH 44139 • 440-248-0400 • Fax: 440-248-6168 • http://www.keithley.com
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4/01
Model 2303/2303B/2303-PJ High Speed Power Supply
User’s Manual
©1998, Keithley Instruments, Inc.
All rights reserved.
Cleveland, Ohio, U.S.A.
Fifth Printing, October 2000
Document Number: 2303-900-01 Rev. E
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
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.
Safety Precautions
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 the operating information carefully
before using the product.
The types of product users are:
Responsible body
ensuring that the equipment is operated within its specifications and operating limits, and for ensuring
that operators are adequately trained.
Operators
and proper use of the instrument. They must be protected from electric shock and contact with hazardous
live circuits.
Maintenance personnel
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
ucts. Only properly trained service personnel may perform installation and service procedures.
Exercise extreme caution when a shock hazard is present. Lethal voltage may be present on cable con-
nector 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.
practice is to expect that hazardous voltage is present in any unknown circuit before measuring.
Users of this product must be protected from electric shock at all times. The responsible body must ensure that users are prevented access and/or insulated from every connection point. In some cases, connections must be exposed to potential human contact. Product users 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,
As described in the International Electrotechnical Commission (IEC) Standard IEC 664, digital multimeter measuring circuits (e.g., Keithley Models 175A, 199, 2000, 2001, 2002, and 2010) are Installation
Category II. All other instruments’ signal terminals are Installation Category I and must not be connected to mains.
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.
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 cables or jumpers, installing or removing switching
cards, or making internal changes, such as installing or removing jumpers.
is the individual or group responsible for the use and maintenance of equipment, for
use the product for its intended function. They must be trained in electrical safety procedures
perform routine procedures on the product to keep it operating, for example,
are trained to work on live circuits, and perform safe installations and repairs of prod-
A good safety
no conductive part of the circuit may be exposed.
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
WARNING
read the associated information very carefully before performing the indicated procedure.
The
CAUTION
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.
heading in a manual explains dangers that might result in personal injury or death. Always
heading in a manual explains hazards that could damage the instrument. Such damage may
Rev. 10/99
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 ........................................................................................... 2-6
SCPI programming — outputting voltage and current .................. 2-7
Reading back V and I ........................................................................ 2-9
Actual V and I display mode .......................................................... 2-9
Measurement configuration ............................................................ 2-9
SCPI programming — measure V and I, and DVM input ........... 2-10
Independent voltage measurements (DVM) .................................... 2-11
DVM input display mode ............................................................. 2-11
Measurement configuration .......................................................... 2-11
SCPI programming — DVM........................................................ 2-11
Sink operation ................................................................................. 2-12
Programming examples.................................................................... 2-13
Outputting and reading back V and I............................................ 2-13
DVM measurements..................................................................... 2-13
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
contact information, safety symbols and terms, inspection and available options and
accessories.
•
Power supply overview
- Covers general information that includes warranty information,
- 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.
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 high voltage may be present on the terminal(s).
Use standard safety precautions to avoid personal contact with these voltages.
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.
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).
igure 1-1
igh speed power
upply (Model 2303
hown)
NOTE
A) Front Panel
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.
POWER
2303 HIGH SPEED POWER SUPPLY 15V/3A 9V/5A
DISPLAY
ISOLATION FROM EARTH:
22 VOLTS MAX.
____
+++
SOURCE SENSE
OUTPUT
15V/3A 9V/5A
SOURCE
DVM IN
LOCAL
MENU
ENTER
LINE FUSE
SLOWBLOW
2.0A, 250V
LINE RATING
100-120VAC/
200-240VAC
+
50, 60 HZ
150VA MAX
OPERATE
SET
RELAY
CONTROL
15VDC MAX
MADE IN
B) Rear Panel
U.S.A.
IEEE-488
(CHANGE IEEE ADDRESS
WITH FRONT PANEL MENU)
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
OPTION” (see Figure 1-1B). When plugged in, the main display module is disabled with the
following message displayed:
NOTE
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.
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
REMOTE PANEL
ENABLED
When the remote display module is unplugged, control returns to the main display module.
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
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 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
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:
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
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
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.
The setup MENU items are explained as follows:
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.
When powering up to the SAV0, SAV1, SAV2, SAV3, or SAV4 setup, the output will be off
- 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:
Menu
NOTE
Models 2303, 2303B and 2303PJ:
Models 2303 and 2303B:
NOTE
SAV5 through SAV9 are not available for the Model 2303-PJ.
SAV0 (output off)
SAV1 (output off)
SAV2 (output off)
SAV3 (output off)
SAV4 (output off)
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)
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).
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 or Trip).
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.
•
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 mea-
•
sure 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 (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.
Figure 2-1
Typical connections
DVM
Input
Output
DVM +
DVM Source Source -
Sense -
Sense +
Source +
Source +
Quick
Disconnect
Connector
External
Test
Circuitry
DUT
+
_
Outputting voltage and current
g
The fundamental process to output voltage and current is to 1) set the output voltage and current limit values, and 2) press the OPERATE key. The details of this process are discussed as
follows.
Setting output voltage and current limit
The output capabilities of the power supply are shown in Figure 2-2. Figure 2-2A shows the
output capabilities for the 5A and AUTO measurement ranges. Notice that when voltage is set
to more than 9V, the maximum current limit is 3A.
Basic Power Supply Operation 2-3
Figure 2-2
Output capabilities
I-Limit
5A
3A
9V
A) 5A or AUTO Measurement Range
I-Limit
1A
B) 5mA Measurement Range (Models 2303 and 2303B)
I-Limit
V-Source
15V
V-Source
15V
0.6A
C) 500mA Measurement Ran
e (Model 2303-PJ)
V-Source
15V
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