Tektronix 2303, 2303B, 2303-PJ Service Manual

Model 2303/2303B/2303-PJ

High Speed Power Supply

Service Manual

Contains Servicing Information

W ARRANTY

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 defecti v e.
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.

LIMIT A TION OF W ARRANTY

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 T O ANY PERSON, OR DAMAGE TO PROPERTY.

Keithley Instruments, Inc. • 28775 Aurora Road • Cleveland, OH 44139 • 440-248-0400 • Fax: [phone] • http://www.k eithley.com

BELGIUM: Keithley Instruments B.V.
CHINA: Keithley Instruments China
FRANCE: Keithley Instruments Sarl 3, allée des Garays • 91127 Palaiseau Cedex • 01-64 53 20 20 • Fax: [phone]
GERMANY: Keithley Instruments GmbH Landsberger Strasse 65 • 82110 Germering • 089/84 93 07-40 • Fax: [phone]
GREAT BRITAIN: Keithley Instruments Ltd
INDIA: Keithley Instruments GmbH Flat 2B, WILOCRISSA • 14, Rest House Crescent • Bangalore 560 001 • 91-80-509-1320/21 • Fax: [phone]
ITALY: Keithley Instruments s.r.l. Viale S. Gimignano, 38 • 20146 Milano • 02-48 39 16 01 • Fax: [phone]
NETHERLANDS: Keithley Instruments B.V. Postbus 559 • 4200 AN Gorinchem • 0183-635333 • Fax: [phone]
SWITZERLAND: Keithley Instruments SA Kriesbachstrasse 4 • 8600 Dübendorf • 01-821 94 44 • Fax: [phone]
TAIWAN: Keithley Instruments Taiwan 1 Fl. 85 Po Ai Street • Hsinchu, Taiwan, R.O.C. • 886-3572-9077• Fax: [phone]

Bergensesteenweg 709 • B-1600 Sint-Pieters-Leeuw • 02/363 00 40 • Fax: [phone]
Y uan Chen Xin Building, Room 705 • 12 Y umin Road, De wai, Madian • Beijing 100029 • 8610-62022886 • Fax: [phone]

Unit 2 Commerce Park, Brunel Road • Theale • Reading • Berkshire RG7 4AB • 0118 929 7500 • Fax: [phone]

4/01

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

Service Manual

©1998, Keithley Instruments, Inc.

All rights reserved.

Cleveland, Ohio, U.S.A.

Third Printing, November 1999

Document Number: 2303-902-01 Rev. C

ManualPrint 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 2303-902-01)............................................................January 1998

Revision B (Document Number 2303-902-01) .................................................................June 1998

Revision C (Document Number 2303-902-01) ........................................................November 1999

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.

SafetyPrecautions

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 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.

Operatorsuse 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
livecircuits.

Maintenance personnel perform routine procedures on the product to keep it operating, 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.

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.

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, no conductive part of the circuit may be exposed.

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.

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.

Whenfuses are usedin a product, replacewith same type and rating for continued protectionagainstfire 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 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.

Rev. 10/99

T able of Contents

1

Performance Verification

Introduction.............................................................................................1-2

Verification test requirements .................................................................1-2

Environmental conditions................................................................1-2

Warm-up period ...............................................................................1-2

Line power.......................................................................................1-3

Recommended test equipment................................................................1-3

Resistor connections ........................................................................1-3

Resistor considerations ....................................................................1-4

Verification limits....................................................................................1-4

Example limits calculation...............................................................1-4

Performing the verification test procedures............................................1-5

Test summary...................................................................................1-5

Test considerations...........................................................................1-5

Instrument programming ........................................................................1-5

Output voltage accuracy..........................................................................1-5

Voltage readback accuracy......................................................................1-7

Compliance current accuracy..................................................................1-7

Current readback accuracy......................................................................1-9

5A range readback accuracy............................................................1-9

Models 2303 and 2303B 5mA range readback accuracy...............1-10

Model 2303-PJ 500mA range readback accuracy .........................1-11

Digital voltmeter input accuracy...........................................................1-13

Calibration

2

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

Environmental conditions.......................................................................2-2

Temperature and relative humidity..................................................2-2

Warm-up period ...............................................................................2-2

Line power.......................................................................................2-2

Calibration considerations ......................................................................2-2

Calibration cycle..............................................................................2-3

Recommended calibration equipment.....................................................2-3

Resistor connections ........................................................................2-3

Resistor considerations ....................................................................2-4

Front panel calibration............................................................................2-4

Model 2303 front panel calibration..................................................2-4

Model 2303-PJ front panel calibration ..........................................2-10

Remote calibration................................................................................2-14

Remote calibration commands.......................................................2-14

Remote calibration display ............................................................2-15

Models 2303 and 2303B remote calibration procedure.................2-15

Model 2303-PJ remote calibration procedure................................2-18

Changing the calibration code ..............................................................2-21

Changing the code from the front panel.........................................2-21

Changing the code by remote.........................................................2-21

Resetting the calibration code ........................................................2-22

Viewing calibration date and count.......................................................2-22

Viewing date and count from the front panel.................................2-22

Acquiring date and count by remote ..............................................2-22

Disassembly

3

Introduction.............................................................................................3-2

Handling and cleaning.............................................................................3-2

Handling PC boards .........................................................................3-2

Solder repairs....................................................................................3-2

Static sensitive devices.....................................................................3-2

Assembly drawings .................................................................................3-3

Disassembly procedures..........................................................................3-3

Case cover removal ..........................................................................3-3

Analog board removal......................................................................3-4

Digital board removal.......................................................................3-4

Front panel disassembly...................................................................3-4

Removing mechanical components..................................................3-5

Instrument re-assembly ...........................................................................3-5

4

Replaceable Parts

Introduction.............................................................................................4-2

Ordering information...............................................................................4-2

Factory service ........................................................................................4-2

Parts lists and component layouts ...........................................................4-2

Models 2303 and 2303-PJ parts lists................................................4-3

Model 2303B parts lists..................................................................4-14

A

Specifications

Specifications .........................................................................................A-2

Accuracy calculations.............................................................................A-6

Output and compliance accuracy ....................................................A-6

Readback accuracy..........................................................................A-6

Digital voltmeter input accuracy.....................................................A-6

B

Calibration Reference

Introduction............................................................................................B-2

Command summary ........................................................................B-2

Miscellaneous commands ......................................................................B-3

Detecting calibration errors....................................................................B-6

Reading the error queue ..................................................................B-6

Error summary.................................................................................B-6

Status byte EAV (Error Available) bit .............................................B-6

Generating an SRQ on error ........................................................... B-7

Detecting calibration step completion ................................................... B-7

Using the *OPC command.............................................................. B-7

Using the *OPC? query .................................................................. B-7

Generating an SRQ on calibration complete .................................. B-8

C

Calibration Programs

Introduction............................................................................................ C-2

Computer hardware requirements.......................................................... C-2

Software requirements........................................................................... C-2

Calibration equipment............................................................................ C-2

General program instructions................................................................. C-3

Program C-1 Model 2303/2303B calibration program................... C-4

Program C-2 Model 2303-PJ calibration program.......................... C-6

Instrument Control

D

Introduction............................................................................................ D-2

Front panel control.................................................................................D-2

Setting the display mode.................................................................D-2

Selecting the current range..............................................................D-2

Turning on the output......................................................................D-2

IEEE-bus control....................................................................................D-3

Setting output values....................................................................... D-3

Setting the reading mode ................................................................ D-3

Turning on the output......................................................................D-4

Requesting readings........................................................................D-4

Basic control program..................................................................... D-4

Program D-1 Basic control programming.......................................D-4

List of Illustrations

1

Performance Verification

Test resistor connections ..................................................................1-4

Connections for voltage verification tests........................................1-6

Connections for output current and 5A range current verification tests.......1-8

Connections for Model 2303 and 2303B

5mA current verification tests....................................................1-10

Connections for Model 2303-PJ 500mA current verification tests1-12

Connections for DVM accuracy verification..................................1-13

Calibration

2

Test resistor connections ..................................................................2-4

Connections for voltage calibration .................................................2-6

Connections for 5A current calibration............................................2-7

Connections for 5mA range calibration ...........................................2-8

Connections for 500mA range calibration .....................................2-12

List of T ables

1

Performance Verification

Recommended verification equipment ...................................................1-3

Output voltage accuracy limits ...............................................................1-6

Voltage readback accuracy limits............................................................1-7

Compliance current accuracy limits........................................................1-9

5A range current readback accuracy limits...........................................1-10

Model 2303 and 2303B 5mA range current readback accuracy limits.1-11

Model 2303-PJ 500mA range current readback accuracy limits..........1-13

Digital voltmeter input accuracy limits.................................................1-14

2

Calibration

Recommended calibration equipment.....................................................2-3

Front panel calibration summary............................................................2-9

Model 2303-PJ front panel calibration summary..................................2-13

Remote calibration command summary ...............................................2-14

Models 2303 and 2303B remote calibration summary.........................2-17

Model 2303-PJ remote calibration summary........................................2-20

4

Replaceable parts

Models 2303 and 2303-PJ digital board parts list...................................4-3

Models 2303 and 2303-PJ analog board parts list..................................4-8

Models 2303 and 2303-PJ display board parts.....................................4-12

Models 2303 and 2303-PJ mechanical parts list...................................4-13

Model 2303B digital board parts list ....................................................4-14

Model 2303B analog board parts list....................................................4-19

Model 2303B mechanical parts list.......................................................4-23

B

Calibration Reference

Remote calibration command summary ................................................ B-2

Calibration step summary...................................................................... B-5

Calibration errors................................................................................... B-6

Instrument Control

D

Basic remote commands........................................................................D-3

1

Performance

Verification

1-2 Performance Verification

Introduction

Use the procedures in this section to verify that Model 2303, Model 2303B, or Model
2303-PJ accuracy is within the limits stated in the accuracy specifications. You can perform these
verification procedures:

• When you first receive the unit to make sure that it was not damaged during shipment.

• To verify that the unit meets factory specifications.

• To determine if calibration is required.

• Following calibration to make sure it was performed properly.

WARNING The information in this section is intended only for qualified service per-

sonnel. Do not attempt these procedures unless you are qualified to do so.

NOTE If the power supply is still under warranty, and its performance is outside specified

limits, contact your Keithley representative or the factory to determine the correct
course of action.

Verificationtestrequirements

Be sure that you perform the verification tests:

• Under the proper environmental conditions.

• After the specified warm-up period.

• Using the correct line voltage.

• Using the proper test equipment.

• Using the specified output signals and reading limits.

Environmental conditions

Conduct your performance verification procedures in a test environment with:

• An ambient temperature of 18-28°C (65-82°F).

• A relative humidity of less than 70% unless otherwise noted.

Warm-upperiod

Allow the Model 2303 to warm up for at least one hour before conducting the verification
procedures.

If the unit has been subjected to temperature extremes (those outside the ranges stated above),
allow additional time for the instrument’s internal temperature to stabilize. Typically, allow one
extra hour to stabilize a unit that is 10°C (18°F) outside the specified temperature range.

Also,allowthe test equipment to warmup for theminimumtimespecifiedbythe manufacturer.

Line power

The Model 2303 requires a line voltage of 100 to 240V and a line frequency of 50 to 60Hz.

Verification tests must be performed within this range.

Recommended testequipment

Table 1-1 summarizes recommended verification equipment. You can use alternate equip­ment as long as that equipment has specifications at least four times better than corresponding
Model 2303, 2303B, or 2303-PJ specifications. Keep in mind, however, that test equipment
accuracy will add to the uncertainty of each measurement.

Table 1-1

Recommended verification equipment

Description Manufacturer/Model Specifications

Digital Multimeter Keithley 2001 DC Voltage1 20V: ±22ppm

Precision Resistor 1Ω, 0.1%, 100W
Precision Resistor 30Ω, 0.1%, 50W
Precision Resistor 3kΩ, 0.1%, 0.25W

Performance Verification 1-3

Resistance1 20Ω: ±59ppm

200Ω: ±43ppm
20kΩ: ±36ppm

2
3

4

1. Full-range, 90-day, 23˚C various measurement points.

2. Characterize resistor using 4-wire ohms function and 20Ω range of DMM before use.

3. Used only for Model 2303-PJ. Characterize resistor using 4-wire ohms function and 200Ω range of DMM

before use. See Resistor considerations for temperature coefficient.

4. Used only for Models 2303 and 2303B. Characterize resistor using 4-wire ohms function and 20kΩ range of

DMM before use.

Resistorconnections

When performing the verification tests, make connections to the test resistors as shown in
Figure 1-1. Be sure to connect the Model 2303 SENSE leads and DMM test leads as close to the
resistor body as possible.

1-4 Performance Verification

Figure 1-1

Test resistor connections

Resistorconsiderations

The test resistors should be characterized using the lowest possible range and the 4-wire ohms
function of the DMM recommended in Table 1-1 to measure the resistance values. Use the mea­sured resistance values to calculate the actual currents during the test procedures.

NOTE The temperature coefficient and temperature change of the 1Ω and 30Ω resistors

when passing current at full load must be low enough so that the change in resistance
does not cause incorrect readings as follows:

V

OUT

voltage, and ∆R is the change in resistance caused by heating.)

Verificationlimits

The verification limits stated in this section have been calculated using only the Model 2303
accuracy specifications, and they do not include test equipment uncertainty . If a particular mea-
surement falls outside the allowable range, recalculate new limits based both on Model 2303
specifications and corresponding test equipment specifications.

Examplelimitscalculation

As an example of how verification limits are calculated, assume you are testing the power
supply using a 10V output value. Using the Model 2303 voltage output accuracy specification
of ±(0.05% of output + 10mV offset), the calculated output limits are:

Output limits = 10V ± [(10V X 0.05%) + 10mV]
Output limits = 10V ± (0.005 + 0.01)
Output limits = 10V ± 0.015V
Output limits = 9.985V to 10.015V

/∆R <25% of Model 2303 amps specification. (V

is the Model 2303 output

OUT

Performance Verification 1-5

Performingtheverificationtestprocedures

Testsummary

• DC voltage output accuracy

• DC voltage readback accuracy

• DC current output accuracy

• DC current readback accuracy

• Digital voltmeter input accuracy

If the Model 2303 is not within specifications and not under warranty, see the calibration pro-

cedures in Section 2 for information on calibrating the unit.

Testconsiderations

When performing the verification procedures:

• Make sure that the test equipment is properly warmed up and connected to the correct
Model 2303 terminals on the rear panel. Also be sure the test equipment is set up for the
proper function and range.

• Do not connect test equipment to the Model 2303 through a scanner, multiplexer, or
other switching equipment.

• Be sure that the power supply output is turned on before making measurements.

• Allow the power supply output signal to settle before making a measurement.

Instrumentprogramming

Refer to Appendix D for basic information on programming the Model 2303, 2303B, or

2303-PJ from the front panel or over the bus.

Outputvoltageaccuracy

Follow the steps below to verify that Model 2303, 2303B, or 2303-PJ output voltage accuracy
is within specified limits. This test involves setting the output voltage to specific values and mea­suring the voltages with a precision digital multimeter.

1. With the power off, connect the digital multimeter to the Model 2303 OUTPUT
SOURCE terminals, as shown in Figure 1-2. Be sure to observe proper polarity
(SOURCE + to INPUT HI; SOURCE - to INPUT LO).

1-6 Performance Verification

PREV

DCV ACV DCI ACI Ω2 Ω4

DISPLAY

NEXT

REL TRIG

POWER

INFO LOCAL EXIT ENTER

Figure 1-2

Connections for voltage verification tests

STORE RECALL

FILTER MATH

CHAN SCAN

CONFIGMENU

Model 2001 DMM

2001 MULTIMETER

FREQ TEMP

RANGE

RANGE

AUTO

Input HI

SENSE

Ω 4 WIRE

350V
PEAK

INPUTS

F R

FRONT/REAR

CAL

Input LO

INPUT

HI

1100V

!

PEAK

LO

500V
PEAK

2A 250V

AMPS

Source + Source -

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

ISOLATION FROM EARTH:

22 VOLTS MAX.

_ _ _ _

+ + +

SOURCE SENSE D VM INSOURCE

(CHANGE IEEE ADDRESS

WITH FRONT PANEL MENU)

MADE IN

U.S.A.

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.

OUTPUT

IEEE-488

0-20V, 0-5A

+

Model 2303

LINE FUSE

SLOWBLOW

2.5A, 250V

LINE RATING

100-240VAC

50, 60 HZ

185VA MAX

REMOTE
DISPLAY

OPTION

2. Select the multimeter DC volts measuring function, and enable auto-ranging.

3. Make sure the Model 2303 output is turned on.

4. Verify output voltage accuracy for each of the voltages listed in Table 1-2. For each test
point:

• Set the Model 2303 output voltage to the indicated value. When setting the voltage,

set the compliance current to 3A.

• Allow the reading to settle.

• Verify that the multimeter reading is within the limits given in the table.

Table 1-2

Output voltage accuracy limits

Model 2303 output

voltage setting

Output voltage limits
(1 Year, 18°C-28°C)

5.00V 4.9875 to 5.0125V

10.00V 9.985 to 10.015V

15.00V 14.9825 to 15.0175V

Voltagereadbackaccuracy

Follow the steps below to verify that Model 2303, 2303B, or 2303-PJ voltage readback accu­racy is within specified limits. The test involves setting the source voltage to specific values, as
measured by a digital multimeter, and then verifying that voltage readback readings are within
required limits.

1. With the power off, connect the digital multimeter to the Model 2303 OUTPUT
SOURCE terminals, as shown in Figure 1-3. Be sure to observe proper polarity
(SOURCE + to INPUT HI; SOURCE - to INPUT LO).

2. Select the multimeter DC volts function, and enable auto-ranging.

3. Make sure actual voltage readings are being displayed (use DISPLAY), and turn on the
Model 2303 output.

4. Verify voltage readback accuracy for each of the voltages listed in Table 1-3. For each
test point:

• Set the Model 2303 output voltage to the indicated value as measured by the digital

multimeter. Note that it may not be possible to set the voltage source precisely to the
specified value. Use the closest possible setting, and modify reading limits accord­ingly. When setting the voltage, set the compliance current to 3A.

• Allow the reading to settle.

• Verify that the actualModel 2303 voltagereading is withinthe limits givenin the table.

Performance Verification 1-7

Table 1-3

Voltage readback accuracy limits

Model 2303 output
voltage setting*

5.00V 4.995 to 5.005V

10.00V 9.992 to 10.008V

14.00V 13.990 to 14.010V

* As measured by digital multimeter. See procedure.

Voltage readback limits
(1 Year, 18°C-28°C)

Compliancecurrentaccuracy

Follow the steps below to verify that Model 2303, 2303B, or 2303-PJ compliance current

accuracy is within specified limits. The test involves setting the compliance current to specific
values and determining the actual current by measuring the voltages across a characterized 1Ω
resistor with a precision digital multimeter.

1. With the power off, connect the digital multimeter and characterized 1Ω resistor to the
Model 2303 OUTPUT SOURCE terminals, as shown in Figure 1-3. Be sure to observe

1-8 Performance Verification

proper polarity (SOURCE + to INPUT HI; SOURCE - to INPUT LO). Also be sure to
use 4-wire connections to the resistor terminals.

PREV

DISPLAY

NEXT

POWER

2001 MULTIMETER

DCV ACV DCI ACI Ω2 Ω4

REL TRIG

STORE RECALL

INFO LOCAL EXIT ENTER

CHAN SCAN

FREQ TEMP

FILTER MATH

CONFIGMENU

RANGE

RANGE

AUTO

Input HI

SENSE

Ω 4 WIRE

350V
PEAK

INPUTS

F R

FRONT/REAR

CAL

INPUT

HI

!

LO

Input LO

1100V
PEAK

500V
PEAK

2A 250V

AMPS

1 Ω Resistor

Model 2001 DMM

22 VOLTS MAX.

_ _ _ _

Sense -

+

LINE FUSE

SLOWBLOW

2.5A, 250V

LINE RATING

100-240VAC

50, 60 HZ

185VA MAX

Note: Use 4-wire connections
to resistor terminals.

Sense +

Source + Source -

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

ISOLATION FROM EARTH:

+ + +

SOURCE SENSE DVM INSOURCE

OUTPUT

0-20V, 0-5A

IEEE-488

(CHANGE IEEE ADDRESS

WITH FRONT PANEL MENU)

MADE IN

U.S.A.

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.

Model 2303

Figure 1-3

Connections for output current and 5A range current verification tests

2. Select the multimeter DC voltage measuring function, and enable auto-ranging.

3. Turn on the Model 2303 output.

4. Verify compliance current accuracy for the currents listed in Table 1-4. For each test
point:

• Set the Model 2303 output voltage to 9V, and set the compliance current to the value

being tested.

• Note and record the digital multimeter voltage reading.

• Calculate the current from the voltage reading and actual 1Ω resistor value: I = V/R

• Verify that the current is within the limits given in the table.

REMOTE
DISPLAY

OPTION

Table 1-4

Compliance current accuracy limits

Performance Verification 1-9

Model 2303 compliance
current setting

1.000A 0.993 to 1.007A

2.000A 1.992 to 2.008A

3.000A 2.990 to 3.010A

4.000A 3.989 to 4.011A

5.000A 4.987 to 5.013A

Compliance current limits
(1 Year, 18°C-28°C)

Current readbackaccuracy

Follow the steps below to verify that Model 2303, 2303B, or 2303-PJ current readback accu­racy is within specified limits. The test involves setting the output current to specific values as
measured with a resistor and precision digital multimeter.

5Arangereadbackaccuracy

1. With the power off, connect the digital multimeter and characterized 1Ω resistor to the

Model 2303 OUTPUT SOURCE terminals, as shown in Figure 1-3. Be sure to observe
proper polarity (SOURCE + to INPUT HI; SOURCE - to INPUT LO). Also be sure to
use 4-wire connections to the resistor terminals.

2. Select the multimeter DC volts measuring function, and enable auto-ranging.

3. Select the 5A readback range. Also make sure actual current readings are displayed.

4. Turn on the Model 2303 output.

5. Verify 5A range current readback accuracy for the currents listed in Table 1-5. For each
test point:

• By changing the output voltage, adjust the current to the correct value, as determined

from the multimeter voltage reading and characterized resistance value. When setting
the voltage, be sure to set the compliance current to 5A.

• Notethat it may not be possibleto set the outputcurrent to the exactvalue.In that case,

set the current to the closest possible value, and modify readinglimits accordingly.

• Allow the reading to settle.

• Verify that the actual Model2303 current reading is withinthe limits givenin the table.

1-10 Performance Verification

Table 1-5

5A range current readback accuracy limits

Nominal output
Voltage

Model 2303
Output current*

Current readback limits
(1 Year, 18°C-28°C)

1V 1.000A 0.9976 to 1.0024A
2V 2.000A 1.9956 to 2.0044A
3V 3.000A 2.9936 to 3.0064A
4V 4.000A 3.9916 to 4.0084A

4.9V 4.900A 4.8898 to 4.9102A

* As determined from digital multimeter and 1Ω resistor. See procedure.

Models 2303and2303B5mArange readbackaccuracy

The following test applies only to the Models 2303 and 2303B:

1. With the power off, connect the digital multimeter and characterized 3kΩ resistor to the

Model 2303 or 2303B OUTPUT SOURCE terminals, as shown in Figure 1-4. Be sure
to observe proper polarity and connections (3kΩ resistor between SOURCE + and DMM
INPUT HI; SOURCE - to DMM INPUT LO).

Input HI

Input LO

1100V
PEAK

500V
PEAK

2A 250V

AMPS

PREV

DCV ACV DCI ACI Ω2 Ω4

DISPLAY

NEXT

REL TRIG

POWER

STORE RECALL

INFO LOCAL EXIT ENTER

CHAN SCAN

FILTER MATH

CONFIGMENU

2001 MULTIMETER

FREQ TEMP

RANGE

RANGE

SENSE

INPUT

Ω 4 WIRE

HI

350V

!

PEAK

LO

INPUTS

F R

FRONT/REAR

AUTO

CAL

3kΩ Resistor

Model 2001 DMM

Sense +

Source + Source -

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

ISOLATION FROM EARTH:

22 VOLTS MAX.

_ _ _ _

+ + +

SOURCE SENSE DVM INSOURCE

OUTPUT

0-20V, 0-5A

IEEE-488

(CHANGE IEEE ADDRESS

WITH FRONT PANEL MENU)

MADE IN

Note: Use 4-wire connections
to resistor terminals.

U.S.A.

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.

Model 2303

Figure 1-4

Connections for Model 2303 and 2303B 5mA current verification tests

+

Sense -

SLOWBLOW

LINE RATING

LINE FUSE

2.5A, 250V

100-240VAC
50, 60 HZ
185VA MAX

REMOTE
DISPLAY
OPTION

Performance Verification 1-11

2. Select the multimeter DC volts measuring function, and enable auto-range.

3. Select the 5mA readback range and actual current reading data.

4. Turn on the Model 2303 output.

5. Verify 5mA range current readback accuracy for the currents listed in Table 1-6. For each
test point:

• Set the Model 2303 output current to the correct value, as determined from the digital

multimeter voltage reading and 3kΩ resistance value. Note that it may not be possible
to set the output current to the exact value. In that case, set the current to the closest
possible value, and modify reading limits accordingly.

• Allow the reading to settle.

• Verify that the actual Model2303 current reading is withinthe limits givenin the table.

Table 1-6

Model 2303 and 2303B 5mA range current readback accuracy limits

Nominal output
Voltage

3V 1.0000mA 0.9970 to 1.0030mA
6V 2.0000mA 1.9950 to 2.0050mA
9V 3.0000mA 2.9930 to 3.0070mA
12V 4.0000mA 3.9910 to 4.0090mA

14.7V 4.9000mA 4.8892 to 4.9108mA

* As determined from digital multimeter voltage reading and 3kΩ resistance
value. See procedure.

Model 2303
output current*

Current readback limits
(1 Year, 18°C-28°C)

Model2303-PJ500mArangereadback accuracy

The following tests apply only to the Model 2303-PJ:

1. With the power off, connect the digital multimeter and characterized 30Ω resistor to the
Model 2303-PJ OUTPUT SOURCE terminals, as shown in Figure 1-5. Be sure to
observe proper polarity and connections (30Ω resistor between SOURCE + and DMM
INPUT HI; SOURCE - to DMM INPUT LO).

1-12 Performance Verification

DCV ACV DCI ACI Ω2 Ω4

PREV

DISPLAY

NEXT

REL TRIG

POWER

INFO LOCAL EXIT ENTER

Note: Use 4-wire connections
to resistor terminals.

STORE RECALL

FILTER MATH

CHAN SCAN

CONFIGMENU

Model 2001 DMM

2001 MULTIMETER

FREQ TEMP

RANGE

AUTO

RANGE

Input HI

SENSE

Ω 4 WIRE

350V
PEAK

INPUTS

F R

FRONT/REAR

CAL

INPUT

HI

!

LO

2A 250V

AMPS

Input LO

1100V
PEAK

500V
PEAK

Sense +

Source + Source -

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

ISOLATION FROM EARTH:

22 VOL TS MAX.

_ _ _ _

+ + +

SOURCE SENSE DVM INSOURCE

(CHANGE IEEE ADDRESS

WITH FRONT PANEL MENU)

MADE IN

U.S.A.

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.

OUTPUT

IEEE-488

+

0-20V, 0-5A

Model 2303

Sense -

SLOWBLOW

LINE RATING

3kΩ Resistor

LINE FUSE

2.5A, 250V

100-240VAC

50, 60 HZ

185VA MAX

REMOTE
DISPLAY

OPTION

Figure 1-5

Connections for Model 2303-PJ 500mA current verification tests

2. Select the multimeter DC volts measuring function, and enable auto-range.

3. Select the 500mA readback range and actual current reading data.

4. Turn on the Model 2303-PJ output.

5. Verify 500mA range current readback accuracy for the currents listed in Table 1-7. For
each test point:

• Set the Model 2303-PJ output current to the correct value, as determined from the dig-

ital multimeter voltage reading and 30Ω resistance value. Note that it may not be pos-
sible to set the output current to the exact value. In that case, set the current to the
closest possible value, and modify reading limits accordingly.

• Allow the reading to settle.

• Verify that the actual Model 2303-PJ current reading is within the limits given in the

table.

Table 1-7

Model 2303-PJ 500mA range current readback accuracy limits

Performance Verification 1-13

Nominal output
voltage

Model 2303-PJ
output current*

Current readback limits (1 Year,
18˚C-28˚C)

3V 100.00mA 99.76 to 100.24mA
6V 200.00mA 199.56 to 200.44mA
9V 300.00mA 299.36 to 300.64mA
12V 400.00mA 399.16 to 400.84mA

14.7V 490.00mA 488.98 to 491.02mA

Digital voltmeter input accuracy

Follow the steps below to verify that Model 2303, 2303B, and 2303-PJ digital voltmeter input
accuracy is within specified limits. The test involves setting the voltage applied to the DVM
input to accurate values and then verifying that the Model 2303 digital voltmeter input readings
are within required limits.

1. With the power off, connect the Model 2303 DVM IN terminals to OUTPUT SOURCE
terminals and the digital multimeter, as shown in Figure 1-6. Be sure to observe proper
polarity (DVM IN + to SOURCE + and DMM INPUT HI; DVM IN - to SOURCE - and
DMM INPUT LO).

Input HI

SENSE

Ω 4 WIRE

350V

PREV

DCV ACV DCI ACI Ω2 Ω4

DISPLAY

NEXT

REL TRIG

POWER

STORE RECALL

INFO LOCAL EXIT ENTER

CHAN SCAN

2001 MULTIMETER

FREQ TEMP

FILTER MATH

CONFIGMENU

RANGE

AUTO

RANGE

PEAK

F R

INPUTS

FRONT/REAR

CAL

INPUT

HI

!

LO

Input LO

1100V
PEAK

500V
PEAK

2A 250V

AMPS

DVM IN ­DVM IN +

Model 2001 DMM

Figure 1-6

Connections for DVM accuracy verification

Source +
Source -

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

ISOLATION FROM EARTH:

22 VOLTS MAX.

_ _ _ _

+ + +

SOURCE SENSE DVM INSOURCE

OUTPUT

0-20V, 0-5A

IEEE-488

(CHANGE IEEE ADDRESS
WITH FRONT PANEL MENU)

MADE IN

U.S.A.

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.

LINE FUSE

SLOWBLOW

2.5A, 250V

LINE RATING

100-240VAC

50, 60 HZ

+

185VA MAX

Model 2303

REMOTE
DISPLAY

OPTION

1-14 Performance Verification

2. Select the DMM DC volts function, and enable auto-ranging.

3. Enable the Model 2303 DVM input.

4. Turn on the Model 2303 source output.

5. Verify digital voltmeter input accuracy for each of the voltages listed in Table 1-8. For
each test point:

• Set the voltage to the indicated value as measured by the digital multimeter.

• Set compliance to 3A.

• Allow the reading to settle.

• Verify that the Model 2303 voltage reading is within the limits given in the table.

Table 1-8

Digital voltmeter input accuracy limits

Model 2303 output
voltage setting*

Digital voltmeter input reading limits
(1 Year, 18°C-28°C)

14.00V 13.990 to 14.010V

3.00V 2.996V to 3.004V

* As measured by digital multimeter. See procedure.

2

Calibration

2-2 Calibration

Introduction

Use the procedures in this section to calibrate the Model 2303, 2303B, or 2303-PJ. These pro­cedures require accurate test equipment to measure precise DC voltages and currents. Calibra­tion can be performed either from the front panel (Models 2303 and 2303-PJ only), or by
sending SCPI calibration commands over the IEEE-488 b us with the aid of a computer (Models
2303, 2303B, and 2303-PJ).

WARNING The information in this section is intended only for qualified service person-

nel. Do not attempt these procedures unless you are qualified to do so.

Environmental conditions

T emperature and relative humidity

Conduct the calibration procedures at an ambient temperature of 18-28°C (65-82°F) with a
relative humidity of less than 70% unless otherwise noted.

W arm-up period

Allow the Model 2303 to warm up for at least one hour before performing calibration.

If the instrument has been subjected to temperature extremes (those outside the ranges stated
above), allow additional time for the instrument’s internal temperature to stabilize. Typically,
allow one extra hour to stabilize a unit that is 10°C (18°F) outside the specified temperature
range.

Also, allow the test equipment to warm up for the minimum time specified by the
manufacturer.

Line power

The Model 2303 requires a line voltage of 100 to 240V at line frequency of 50 to 60Hz. The
instrument must be calibrated while operating from a line voltage within this range.

Calibration considerations

When performing the calibration procedures:

• Make sure that the test equipment is properly warmed up and connected to the appropri­ate Model 2303 terminals.

• Always allow the source signal to settle before calibrating each point.

• Do not connect test equipment to the Model 2303 through a scanner or other switching
equipment.

20 Ω

Ω

Ω

Ω

Calibration 2-3

• Calibration must be performed in the sequence outlined in this manual, or an error will
occur.

• If an error occurs during calibration, the Model 2303 will generate an appropriate error
message. See Appendix B for more information.

WARNING The maximum common-mode voltage (voltage between LO and chassis

ground) is 22VDC. Exceeding this value may cause a breakdown in insu­lation, creating a shock hazard.

Calibration cycle

Perform calibration at least once a year to ensure the unit meets or exceeds its specifications.

Recommended calibration equipment

Table 2-1 lists the recommended equipment for the calibration procedures. You can use
alternate equipment as long as that equipment has specifications at least four times better than
corresponding Model 2303 specifications. See also Resistor considerations for important tem­perature coefficient information.

Table 2-1

Recommended calibration equipment

Description Manufacturer/Model Specifications

Digital Multimeter Keithley 2001 DC Voltage

Resistance

Precision Resistor 4
Precision Resistor 30 Ω , 0.1%, 50W
Precision Resistor 3k Ω , 0.1%, 0.125W

1. Full-range, 90-day, 23˚C ±5˚C accuracy specifications of ranges required for various measurement points.

2. Characterize resistor using 4-wire ohms function and 20 Ω range of DMM before use.

3. Required only for Model 2303-PJ. Characterize resistor using 4-wire ohms function and 200 Ω range of DMM

before use. See Resistor considerations for temperature coefficient.

4. Required only for Models 2303 and 2303B. Characterize resistor using 4-wire ohms function and 20k Ω range

of DMM before use. See Resistor considerations for temperature coefficient.

, 0.1%, 100W

1

20V: ±22ppm

1

200
20k

2
3

: ±59ppm

: ±43ppm
: ±36ppm

4

Resistor connections

When performing calibration, make connections to the test resistors as shown in Figure 2-1.
Be sure to connect the Model 2303 SENSE leads and DMM test leads as close to the resistor
body as possible.

2-4 Calibration

2303 Source +

2303 Sense +

2303 Sense -

2303 Source -

Figure 2-1

Test resistor connections

Resistor considerations

The test resistors should be characterized using the 4-wire ohms function of the DMM rec­ommended in Table 2-1 to measure the resistance values. Use the measured resistance values to
calculate the actual currents during the calibration procedures.

NOTE The temperature coefficient and temperature change of the 4

when passing current at full load must be low enough so that the c hange in r esistance
does not cause incorrect readings as follows:

/

∆

R <25% of Model 2303 amps specification. (V

V

OUT

voltage, and

DMM Input HI

Test Resistor

DMM Input LO

OUT

∆

R is the change in resistance caused by heating.)

Ω

and 30

Ω

resistors

is the Model 2303 output

Front panel calibration

Model 2303 and Model 2303-PJ front panel calibration are covered separately below.

Model 2303 front panel calibration

Use the following procedure to calibrate the Model 2303 from the front panel. T able 2-2 sum­marizes calibration steps.

NOTE Calibration must be performed in the following sequence, or an error will occur. To

abort calibration and re vert to previous calibration constants at any time during the
procedure, press the MENU key.

Calibration 2-5

Step 1: Prepare the Model 2303 for calibration

1. Turn on the Model 2303 and the digital multimeter, and allow them to warm up for at
least one hour before performing calibration.

2. Press the MENU key, then choose CALIBRATE UNIT, and press ENTER. The instru­ment will display the date last calibrated:

CALIBRATE UNIT

LAST ON 02/01/98

3. Press the up arrow key. The instrument will display the number of times it was
calibrated:

CALIBRATE UNIT

TIMES= 01

4. Press the up arrow key. The unit will then prompt you to run calibration:

CALIBRATE UNIT

RUN

5. Press ENTER. The unit will then prompt for the calibration code:

CALIBRATE UNIT

Cal Code KI002303

6. Using the edit keys, set the display to the current calibration code, then press ENTER.
(Default: KI002303.) The unit will then prompt you as to whether or not to change the
code:

CALIBRATE UNIT

Change Code NO

7. Be sure NO is selected (use the up and down arrow k eys), press ENTER, then follo w the
steps below to calibrate the unit. (See Changing the calibration code at the end of this
section if you wish to change the code.)

Step 2: Perform calibration steps

NOTE The unit will display the most recently calibrated values. Factory defaults are shown

in this manual.

1. Connect both the OUTPUT SOURCE and DVM IN terminals to the digital multimeter,
as shown in Figure 2-2. (Connect SOURCE + and D VM IN + to DMM INPUT HI; con­nect SOURCE - and DVM IN - to DMM INPUT LO.)

2-6 Calibration

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.

PREV

DCV ACV DCI ACI Ω2 Ω4

DISPLAY

NEXT

REL TRIG

POWER

STORE RECALL

INFO LOCAL EXIT ENTER

CHAN SCAN

FILTER MATH

CONFIG MENU

2001 MULTIMETER

FREQ TEMP

RANGE

AUTO

RANGE

Input HI

SENSE

Ω 4 WIRE

350V
PEAK

INPUTS

FR

FRONT/REAR

CAL

INPUT

HI

!

LO

2A 250V

AMPS

Input LO

1100V
PEAK

500V

PEAK

Source -

DVM IN +

DVM IN -

Model 2001 DMM

Source +

MADE IN

U.S.A.

ISOLATION FROM EARTH:

22 VOLTS MAX.

____

+++

SOURCE SENSE

OUTPUT

0-20V, 0-5A

IEEE-488

(CHANGE IEEE ADDRESS

WITH FRONT PANEL MENU)

LINE FUSE
SLOWBLOW

2.5A, 250V

LINE RATING

100-240VAC

50, 60 HZ

185VA MAX

+

DVM IN

SOURCE

REMOTE
DISPLAY
OPTION

Model 2303

Figure 2-2

Connections for voltage calibration

2. At this point, the Model 2303 will prompt you to set the full-scale output voltage:

FULL SCALE VOLTS

SET 14.0000 V

3. Use the edit keys to set the voltage to 14.0000V, then press ENTER.

NOTE At this point, the source output is turned on and will remain on until calibration is

complete or aborted with the MENU key.

4. The unit will prompt you for the DMM reading, which will be used to calibrate the full­scale output voltage:

FULL SCALE VOLTS

READ1 14.0000 V

5. Using the edit keys, adjust the Model 2303 voltage display to agree with the DMM volt­age reading, then press ENTER. The unit will then prompt for another DMM reading,
which will be used to calibrate the full-scale measurement function:

FULL SCALE VOLTS

READ2 14.0000 V

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.

Ω

Ω

Calibration 2-7

6. Using the edit keys, adjust the display to agree with the ne w DMM voltage reading, then
press ENTER. The unit will then will then prompt for DVM full-scale calibration:

FULL SCALE DVM

ALL READY TO DO?

7. Press ENTER to complete DVM full-scale calibration.

8. Connect the digital multimeter volts input and characterized 4

resistor to the Model
2303 OUTPUT SOURCE terminals, as shown in Figure 2-3. Be sure to observe proper
polarity (SOURCE + to DMM INPUT HI; SOURCE - to INPUT LO).

9. Be sure the digital multimeter DC volts function and auto-ranging are still selected.

Input HI

Input LO

1100V
PEAK

500V

PEAK

2A 250V

AMPS

4 Ω Resistor

PREV

DCV ACV DCI ACI Ω2 Ω4

DISPLAY

NEXT

REL TRIG

POWER

STORE RECALL

INFO LOCAL EXIT ENTER

CHAN SCAN

FILTER MATH

CONFIG MENU

2001 MULTIMETER

FREQ TEMP

RANGE

RANGE

SENSE

INPUT

Ω 4 WIRE

HI

350V

!

PEAK

LO

INPUTS

FR

AUTO

FRONT/REAR

CAL

Model 2001 DMM

____

SOURCE

DVM IN

Sense -

+

LINE FUSE

SLOWBLOW

2.5A, 250V

LINE RATING

100-240VAC

50, 60 HZ

185VA MAX

REMOTE
DISPLAY
OPTION

Note: Use 4-wire connections
to resistor terminals.

Sense +

Source + Source -

ISOLATION FROM EARTH:

22 VOLTS MAX.

+++

SOURCE SENSE

OUTPUT

0-20V, 0-5A

IEEE-488

(CHANGE IEEE ADDRESS

WITH FRONT PANEL MENU)

MADE IN

U.S.A.

Model 2303

Figure 2-3

Connections for 5A current calibration

10. At this point, the unit will prompt for 5A full-scale calibration output:

SOURCE 5 AMPS

SET 1.90000 A

11. Using the edit keys, adjust the set value to 1.9000A, then press ENTER. The unit will
then prompt you for the DMM reading, which calibrates the 5A current limit:

SOURCE 5 AMPS

READ1 1.90000 A

12. Note the DMM voltage reading, then calculate the current from that reading and the
actual 4

resistance value: I = V/R. Adjust the Model 2303 current display v alue to agree

with the calculated current value, and press ENTER.

2-8 Calibration

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.

Ω

13. The Model 2303 will then prompt for another DMM reading, which is used for 5A mea­surement calibration:

SOURCE 5 AMPS

READ2 1.90000 A

14. Again, calculate the current from the new DMM reading and 4 Ω resistor value. Adjust
the 2303 current display reading to agree with the new current, then press ENTER.

15. Disconnect the 4

PREV

DCV ACV DCI ACI Ω2 Ω4

DISPLAY

NEXT

REL TRIG

POWER

STORE RECALL

INFO LOCAL EXIT ENTER

CHAN SCAN

resistor, then connect the 3k Ω resistor in its place. (See Figure 2-4.)

Input HI

Input LO

1100V
PEAK

500V
PEAK

2A 250V

AMPS

3kΩ Resistor

FILTER MATH

CONFIG MENU

2001 MULTIMETER

FREQ TEMP

RANGE

AUTO

RANGE

SENSE

Ω 4 WIRE

350V
PEAK

INPUTS

FR

FRONT/REAR

CAL

INPUT

HI

!

LO

Model 2001 DMM

____

SOURCE

DVM IN

Sense -

+

LINE FUSE

SLOWBLOW

2.5A, 250V

LINE RATING

100-240VAC

50, 60 HZ

185VA MAX

REMOTE
DISPLAY

OPTION

Note: Use 4-wire connections
to resistor terminals.

Sense +

Source + Source -

ISOLATION FROM EARTH:

22 VOLTS MAX.

+++

SOURCE SENSE

OUTPUT

0-20V, 0-5A

IEEE-488

(CHANGE IEEE ADDRESS

WITH FRONT PANEL MENU)

MADE IN

U.S.A.

Model 2303

Figure 2-4

Connections for 5mA range calibration

16. Make sure the DMM DC volts function and auto-ranging are still selected.

17. At this point, the unit will prompt to output approximately 5mA for 5mA range full-scale
calibration:

SOURCE 5 mA

ALL READY TO DO?

18. Press ENTER to output approximately 5mA. The unit will then prompt you for the
DMM reading:

SOURCE 5 mA

READ1 4.50000 mA

Ω

Calibration 2-9

19. Note the DMM voltage reading, then calculate the current from that voltage reading and
actual 3k

resistance value. Adjust the Model 2303 current display value to agree with

that value, and press ENTER.

Table 2-2

Model 2303 front panel calibration summary

Step* Description

Nominal calibration

signal**

0 Output 14V 14V
1 Full-scale output voltage 14V
2 Full-scale measure 14V
3 Full-scale DVM 14V
4 5A range output current 1.9A
5 5A current limit 1.9A
6 5A measure 1.9A
7 5mA range output current 4.5mA
8 5mA measure 4.5mA

* Step numbers correspond to :CAL:PROT:STEP command numbers. See Table 2-3.
** Factory default display values.

Test connections

Figure 2-2
Figure 2-2
Figure 2-2
Figure 2-2
Figure 2-3
Figure 2-3
Figure 2-3
Figure 2-4
Figure 2-4

Step 3: Enter calibration dates, and save calibration

1. After completing all calibration steps, the unit will prompt if you wish to save
calibration:

CALIBRATE UNIT

Save Cal Data YES

2. T o sav e ne w calibration constants, select YES, then press ENTER. If, on the other hand,
you wish to exit calibration without saving new calibration constants, select NO, then
press ENTER. In that case, the unit will revert to prior calibration constants.

3. The unit will then prompt you to enter the calibration date:

CALIBRATE UNIT

Cal Date 02/01/98

4. Using the edit keys, set the calibration date to today’s date, then press ENTER. The unit
will display the following:

CALIBRATE UNIT

EXITING CAL

5. Press ENTER to complete the calibration procedure and return to the menu display . Cal­ibration is now complete.

2-10 Calibration

Model 2303-PJ front panel calibration

Use the following procedure to calibrate the Model 2303-PJ from the front panel. Table 2-3

summarizes the calibration steps.

NOTE Calibration must be performed in the following sequence, or an error will occur. To

abort calibration and re vert to previous calibration constants at any time during the
procedure, press the MENU key.

Step 1: Prepare the Model 2303-PJ for calibration

1. Turn on the Model 2303 and the digital multimeter, and allow them to warm up for at
least one hour before performing calibration.

2. Press the MENU key, then choose CALIBRATE UNIT, and press ENTER. The instru­ment will display the date last calibrated:

CALIBRATE UNIT

LAST ON 02/01/98

3. Press the up arrow key. The instrument will display the number of times it was
calibrated:

CALIBRATE UNIT

TIMES= 01

4. Press the up arrow key. The unit will then prompt you to run calibration:

CALIBRATE UNIT

RUN

5. Press ENTER. The unit will then prompt for the calibration code:

CALIBRATE UNIT

Cal Code KI002303

6. Using the edit keys, set the display to the current calibration code, then press ENTER.
(Default: KI002303.) The unit will then prompt you as to whether or not to change the
code:

CALIBRATE UNIT

Change Code NO

7. Be sure NO is selected (use the up and down arrow k eys), press ENTER, then follo w the
steps below to calibrate the unit. (See
section if you wish to change the code.)

Changing the calibration code at the end of this

Step 2: Perform calibration steps

NOTE The unit will display the most recently calibrated values. Factory defaults are shown

in this manual.

1. Connect both the OUTPUT SOURCE and DVM IN terminals to the digital multimeter,
as shown in Figure 2-2. (Connect SOURCE + and D VM IN + to DMM INPUT HI; con­nect SOURCE - and DVM IN - to DMM INPUT LO.)

Calibration 2-11

2. At this point, the Model 2303 will prompt you to set the full-scale output voltage:

FULL SCALE VOLTS

SET 14.0000 V

3. Use the edit keys to set the voltage to 14.0000V, then press ENTER.

NOTE At this point, the source output is turned on and will remain on until calibration is

complete or aborted with the MENU key.

4. The unit will prompt you for the DMM reading, which will be used to calibrate the full­scale output voltage:

FULL SCALE VOLTS

READ1 14.0000 V

5. Using the edit keys, adjust the Model 2303-PJ voltage display to agree with the DMM
voltage reading, then press ENTER. The unit will then prompt for another DMM read­ing, which will be used to calibrate the full-scale measurement function:

FULL SCALE VOLTS

READ2 14.0000 V

6. Using the edit keys, adjust the display to agree with the ne w DMM voltage reading, then
press ENTER. The unit will then prompt for DVM full-scale calibration:

FULL SCALE DVM

ALL READY TO DO?

7. Press ENTER to complete DVM full-scale calibration.

8. Connect the digital multimeter volts input and characterized 4Ω resistor to the Model
2303-PJ OUTPUT SOURCE terminals, as shown in Figure 2-3. Be sure to observe
proper polarity (SOURCE + to DMM INPUT HI; SOURCE - to INPUT LO).

9. Be sure the digital multimeter DC volts function and auto-ranging are still selected.

10. At this point, the unit will prompt for 5A full-scale calibration output:

SOURCE 5 AMPS

SET 1.90000 A

11. Using the edit keys, adjust the set value to 1.9000A, then press ENTER. The unit will
then prompt you for the DMM reading, which calibrates the 5A current limit:

SOURCE 5 AMPS
READ1 1.90000 A

12. Note the DMM voltage reading, then calculate the current from that reading and the
actual 4Ω resistance value: I = V/R. Adjust the Model 2303-PJ current display value to
agree with the calculated current value, and press ENTER.

13. The Model 2303-PJ will then prompt for another DMM reading, which is used for 5A
measurement calibration:

SOURCE 5 AMPS

READ2 1.90000 A

14. Again, calculate the current from the new DMM reading and 4Ω resistor value. Adjust
the 2303 current display reading to agree with the new current, then press ENTER.

2-12 Calibration

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.

15. Disconnect the 4Ω resistor, then connect the characterized 30Ω resistor in its place. (See

Figure 2-5.)

Input HI

Input LO

INPUT

1100V
PEAK

500V
PEAK

2A 250V

AMPS

3kΩ Resistor

PREV

DCV ACV DCI ACI Ω2 Ω4

DISPLAY

NEXT

REL TRIG

POWER

STORE RECALL

INFO LOCAL EXIT ENTER

CHAN SCAN

FILTER MATH

CONFIG MENU

2001 MULTIMETER

FREQ TEMP

RANGE

RANGE

SENSE

Ω 4 WIRE

HI

350V

!

PEAK

LO

INPUTS

FR

AUTO

FRONT/REAR

CAL

Model 2001 DMM

22 VOLTS MAX.

____

OUTPUT

0-20V, 0-5A

Sense -

LINE FUSE

SLOWBLOW

2.5A, 250V

LINE RATING

100-240VAC

50, 60 HZ
185VA MAX

+

DVM IN

SOURCE

REMOTE
DISPLAY

OPTION

Note: Use 4-wire connections
to resistor terminals.

Sense +

Source + Source -

ISOLATION FROM EARTH:

+++

SOURCE SENSE

IEEE-488

(CHANGE IEEE ADDRESS

WITH FRONT PANEL MENU)

MADE IN

U.S.A.

Model 2303-PJ

Figure 2-5

Connections for 500mA range calibration

16. Make sure the DMM DC volts function and auto-ranging are still selected.

17. At this point, the unit will prompt to output approximately 500mA for 500mA range full­scale calibration:

SOURCE 500 mA

ALL READY TO DO?

18. Press ENTER to output approximately 500mA. The unit will then prompt you for the
DMM reading:

SOURCE 500 mA

READ1 450.000 mA

19. Note the DMM voltage reading, then calculate the current from that voltage reading and
actual 30Ω resistance value. Adjust the Model 2303-PJ current display value to agree
with that value, and press ENTER.

Calibration 2-13

Table 2-3

Model 2303-PJ front panel calibration summary

Step* Description Nominal calibration signal** Test connections

0 Output 14V 14V Figure 2-2
1 Full-scale output voltage 14V Figure 2-2
2 Full-scale measure 14V Figure 2-2
3 Full-scale DVM 14V Figure 2-2
4 5A range output current 1.9A Figure 2-3
5 5A current limit 1.9A Figure 2-3
6 5A measure 1.9A Figure 2-3
7 500mA range output current 450mA Figure 2-5
8 500mA measure 450mA Figure 2-5

* Step numbers correspond to :CAL:PROT:STEP command numbers.
** Factory default display values.

Step 3: Enter calibration dates, and save calibration

1. After completing all calibration steps, the unit will prompt if you wish to save
calibration:

CALIBRATE UNIT

Save Cal Data YES

2. T o sav e ne w calibration constants, select YES, then press ENTER. If, on the other hand,
you wish to exit calibration without saving new calibration constants, select NO, then
press ENTER. In that case, the unit will revert to prior calibration constants.

3. The unit will then prompt you to enter the calibration date:

CALIBRATE UNIT

Cal Date 02/01/98

4. Using the edit keys, set the calibration date to today’s date, then press ENTER. The unit
will display the following:

CALIBRATE UNIT

EXITING CAL

5. Press ENTER to complete the calibration procedure and return to the menu display.
Calibration is now complete.

2-14 Calibration

Remote calibration

Follow the procedure outlined below to perform Model 2303, 2303B, and 2303-PJ remote
calibration by sending SCPI commands over the IEEE-488 bus. The remote commands and
appropriate parameters are separately summarized for each step.

Remote calibration commands

Table 2-4 summarizes remote calibration commands. For a more complete description of
these commands, refer to Appendix B.

Table 2-4

Remote calibration command summary

Command Description

:CALibration Calibration subsystem.

:PROTected Cal commands protected by password.

:CODE '<code>' Unlock cal; changes code if cal is already unlocked. (Default

:COUNt? Query number of times 2303 has been calibrated.
:DATE <yyyy>,<mm>,<dd> Program calibration year, month, day.
:DATE? Query calibration year, month, day.
:INIT Initiate calibration (must be sent before other cal steps).
:SAVE Save calibration data to EEPROM.*
:LOCK Lock out calibration. (Abort if calibration is incomplete.)
:STEP0 <nrf> Output full-scale voltage (14V).
:STEP1 <nrf> Calibrate output voltage setting using external DMM reading.
:STEP2 <nrf> Calibrate voltage measuring using external DMM reading.
:STEP3 Perform DVM input full-scale (14V) cal.
:STEP4 <nrf> Output current (1.9A) for 5A full-scale cal.
:STEP5 <nrf> Calibrate output current limit using calculated current.
:STEP6 <nrf> Calibrate 5A measurement range using calculated current.
:STEP7 Output 5mA (500mA, Model 2303-PJ) nominal current for 5mA

:STEP8 <nrf> Calibrate 5mA (500mA, Model 2303-PJ) measurement range

* Calibration data will not be saved if:

1. Calibration was not unlocked with :CODE command.

2. Invalid data exists. (For example, cal step failed or was aborted.)

3. Incomplete number of cal steps were performed.

4. Calibration was not performed in the proper sequence.

code: KI002303.)

(500mA) range full-scale cal.

using calculated current.

Remote calibration display

The Model 2303 and Model 2303-PJ will display the following while being calibrated over

the bus:

CALIBRATING UNIT

FROM THE BUS R

Models 2303 and 2303B remote calibration procedure

Use the following procedure to calibrate the Models 2303 and 2303B. Table 2-5 summarizes

the calibration steps.

NOTE Calibration steps must be performed in the following sequence, or an error will occur.

You can abort the procedure and revert to previous calibration constants before
:SAVE by sending the :CAL:PROT:LOCK command.

Step 1: Prepare the Model 2303 for calibration

1. Connect the Model 2303 to the controller IEEE-488 interface using a shielded interface
cable.

2. Turn on the Model 2303 and the test equipment, and allow them to warm up for at least
one hour before performing calibration.

3. Make sure the IEEE-488 primary address of the Model 2303 is the same as the address
specified in the program you will be using to send commands.

4. Send the following command with the correct code to unlock calibration:

:CAL:PROT :CODE ‘<code>’

For example, with the factory default code of KI002303, send:

Calibration 2-15

CAL:PROT:CODE ‘KI002303’

5. Send the following command to initiate calibration:

:CAL:PROT:INIT

Step 2: Perform calibration steps

NOTE Allow the Model 2303 to complete each calibration step before going on to the next

one. See Detecting calibration step completion in Appendix B.

1. Connect both the OUTPUT SOURCE and DVM IN terminals to the digital multimeter,
as shown in Figure 2-2. (Connect SOURCE + and DVM IN + to DMM INPUT HI;
SOURCE - and DVM IN - to DMM INPUT LO.)

2. Send the following command to output 14V:

:CAL:PROT:STEP0 14

2-16 Calibration

NOTE At this point, the source output is turned on and will remain on until calibration is

completed or aborted with the :CAL:PROT:LOCK command.

3. Note and record the DMM reading, then send that reading as the parameter for the fol­lowing command:

:CAL:PROT:STEP1 <DMM_Reading>

For example, if the DMM reading is 14.012V, the command would be:

:CAL:PROT:STEP1 14.012

4. Note and record a new DMM reading, then send that reading as the parameter for the
following command:

:CAL:PROT:STEP2 <DMM_Reading>

5. Send the following command for DVM full-scale calibration:

:CAL:PROT:STEP3

6. Connect the Model 2303 OUTPUT SOURCE terminals to the DMM volts input and
characterized 4Ω resistor, as shown in Figure 2-3. Be sure to observe proper polarity
(SOURCE + to INPUT HI; SOURCE - to INPUT LO).

7. Make sure the digital multimeter DC volts function and auto-ranging are still selected.

8. Send the following command to output 1.9A for 5A full-scale calibration:

:CAL:PROT:STEP4 1.9

9. Note and record the DMM voltage reading, then calculate the current from that reading
and 4Ω resistor value. Send the following command using that calculated current as the
parameter:

:CAL:PROT:STEP5 <Calculated_Current>

For example, with a current value of 1.894A, the command would appear as follows:

:CAL:PROT:STEP5 1.894

10. Note and record a new DMM voltage reading, then ag ain calculate the current from the
voltage and resistance. Send the calculated current value as the parameter for the follo w­ing command:

:CAL:PROT:STEP6 <Calculated_Current>

11. Connect the characterized 3kΩ resistor in place of the 4Ω resistor. (See Figure 2-4.)

12. Make sure the DMM DC volts function and auto-range are still selected.

13. Send the following command to output approximately 5mA for 5mA full-scale
calibration:

:CAL:PROT:STEP7

14. Note and record the DMM voltage reading, then calculate the current from the voltage
reading and actual 3kΩ resistance value. Send that current v alue as the parameter for the
following command:

:CAL:PROT:STEP8 <Calculated_Current>

For example, with a current of 4.5mA, the command would be:

:CAL:PROT:STEP8 4.5E-3

Table 2-5

Models 2303 and 2303B remote calibration summary

Calibration 2-17

Step* Command Description

:CAL:PROT:CODE ‘KI002303’ Unlock calibration. None

:CAL:PROT:INIT Initiate calibration. None
0 :CAL:PROT:STEP0 14 Full-scale (14V) output Figure 2-2
1 :CAL:PROT:STEP1 <DMM_Reading> Full-scale output cal. Figure 2-2
2 :CAL:PROT:STEP2 <DMM_Reading> Full-scale measure cal. Figure 2-2
3 :CAL:PROT:STEP3 DVM full-scale cal. Figure 2-2
4 :CAL:PROT:STEP4 1.9 Source full-scale current

cal.
5 :CAL:PROT:STEP5 <Current> 5A current limit cal. Figure 2-3
6 :CAL:PROT:STEP6 <Current> 5A measure cal. Figure 2-3
7 :CAL:PROT:STEP7 Source 5mA full-scale

current.
8 :CAL:PROT:STEP8 <Current> 5mA range measure cal. Figure 2-4

:CAL:PROT:DATE <yyyy,mm,dd> Program calibration date. None
:CAL:PROT:SAVE Save calibration data. None
:CAL:PROT:SAVE Lock out calibration. None

* Step numbers correspond to :STEP commands.

Test
connections

Figure 2-3

Figure 2-4

Step 3: Program calibration date

Use following commands to set the calibration date:

:CAL:PROT:DATE <yyyy>, <mm>, <dd>

Note that the year, month, and date must be separated by commas. The allowable range for

the year is from 1997 to 2096, the month is from 1 to 12, and the date is from 1 to 31.

Step 4: Save calibration constants and lock out calibration

Calibration is now complete, so you can store the calibration constants in EER OM by sending

the following command:

:CAL:PROT:SAVE

NOTE Calibration will be temporary unless you send the SAVE command. Also, calibration

data will not be saved if (1) calibration is locked, (2) invalid data exists, or (3) all
steps were not completed in the proper sequence. In that case, the unit will revert to
previous calibration constants.

After saving constants, lock out calibration by sending :CAL:PROT:LOCK.

2-18 Calibration

Model 2303-PJ remote calibration procedure

Follow the steps below to calibrate the Model 2303-PJ via remote. Table 2-6 summarizes

these steps.

NOTE Calibration steps must be performed in the following sequence, or an error will occur.

You can abort the procedure and revert to previous calibration constants before
:SAVE by sending the :CAL:PROT:LOCK command.

Step 1: Prepare the Model 2303-PJ for calibration

1. Connect the Model 2303-PJ to the controller IEEE-488 interface using a shielded inter­face cable.

2. Turn on the Model 2303-PJ and the test equipment, and allow them to warm up for at
least one hour before performing calibration.

3. Make sure the IEEE-488 primary address of the Model 2303-PJ is the same as the
address specified in the program you will be using to send commands.

4. Send the following command with the correct code to unlock calibration:

:CAL:PROT:CODE ‘<code>’

For example, with the factory default code of KI002303, send:

CAL:PROT:CODE ‘KI002303’

5. Send the following command to initiate calibration:

:CAL:PROT:INIT

Step 2: Perform calibration steps

NOTE Allow the Model 2303-PJ to complete each calibration step before going on to the

next one. See Detecting calibration step completion in Appendix B.

1. Connect both the OUTPUT SOURCE and DVM IN terminals to the digital multimeter,
as shown in Figure 2-2. (Connect SOURCE + and DVM IN + to DMM INPUT HI;
SOURCE - and DVM IN - to DMM INPUT LO.)

2. Send the following command to output 14V:

:CAL:PROT:STEP0 14

NOTE At this point, the source output is turned on and will remain on until calibration is

completed or aborted with the :CAL:PROT:LOCK command.

3. Note and record the DMM reading, then send that reading as the parameter for the fol­lowing command:

:CAL:PROT:STEP1 <DMM_Reading>

For example, if the DMM reading is 14.012V, the command would be:

:CAL:PROT:STEP1 14.012

4. Note and record a new DMM reading, then send that reading as the parameter for the
following command:

:CAL:PROT:STEP2 <DMM_Reading>

Calibration 2-19

5. Send the following command for DVM full-scale calibration:

:CAL:PROT:STEP3

6. Connect the Model 2303-PJ OUTPUT SOURCE terminals to the DMM volts input and

characterized 4Ω resistor, as shown in Figure 2-3. Be sure to observe proper polarity
(SOURCE + to INPUT HI; SOURCE - to INPUT LO).

7. Make sure the digital multimeter DC volts function and auto-ranging are still selected.

8. Send the following command to output 1.9A for 5A full-scale calibration:

:CAL:PROT:STEP4 1.9

9. Note and record the DMM voltage reading, then calculate the current from that reading

and 4Ω resistor value. Send the following command using that calculated current as the
parameter:

:CAL:PROT:STEP5 <Calculated_Current>

For example, with a current value of 1.894A, the command would appear as follows:

:CAL:PROT:STEP5 1.894

10. Note and record a new DMM voltage reading, then ag ain calculate the current from the
voltage and resistance. Send the calculated current value as the parameter for the follo w­ing command:

:CAL:PROT:STEP6 <Calculated_Current>

11. Connect the characterized 30Ω resistor in place of the 4Ω resistor. (See Figure 2-5.)

12. Make sure the DMM DC volts function and auto-range are still selected.

13. Send the following command to output approximately 500mA for 500mA full-scale
calibration:

:CAL:PROT:STEP7

14. Note and record the DMM voltage reading, then calculate the current from the voltage
reading and actual 30Ω resistance value. Send that current v alue as the parameter for the
following command:

:CAL:PROT:STEP8 <Calculated_Current>

For example, with a current of 450mA, the command would be:

:CAL:PROT:STEP8 450E-3

2-20 Calibration

Table 2-6

Model 2303-PJ remote calibration summary

Step* Command Description

:CAL:PROT:CODE ‘KI002303’ Unlock calibration. None

:CAL:PROT:INIT Initiate calibration. None
0 :CAL:PROT:STEP0 14 Full-scale (14V) output Figure 2-2
1 :CAL:PROT:STEP1 <DMM_Reading> Full-scale output cal. Figure 2-2
2 :CAL:PROT:STEP2 <DMM_Reading> Full-scale measure cal. Figure 2-2
3 :CAL:PROT:STEP3 DVM full-scale cal. Figure 2-2
4 :CAL:PROT:STEP4 1.9 Source full-scale current

cal.
5 :CAL:PROT:STEP5 <Current> 5A current limit cal. Figure 2-3
6 :CAL:PROT:STEP6 <Current> 5A measure cal. Figure 2-3
7 :CAL:PROT:STEP7 Source 500mA full-scale

current.
8 :CAL:PROT:STEP8 <Current> 500mA range measure cal. Figure 2-5

:CAL:PROT:DATE <yyyy,mm,dd> Program calibration date. None
:CAL:PROT:SAVE Save calibration data. None
:CAL:PROT:SAVE Lock out calibration. None

* Step numbers correspond to :STEP commands.

Test
connections

Figure 2-3

Figure 2-5

Step 3: Program calibration date

Use following commands to set the calibration date:

:CAL:PROT:DATE <yyyy>, <mm>, <dd>

Note that the year, month, and date must be separated by commas. The allowable range for

the year is from 1997 to 2096, the month is from 1 to 12, and the date is from 1 to 31.

Step 4:Save calibration constants and lock out calibration

Calibration is now complete, so you can store the calibration constants in EER OM by sending

the following command:

:CAL:PROT:SAVE

NOTE Calibration will be temporary unless you send the SAVE command. Also, calibration

data will not be saved if (1) calibration is locked, (2) invalid data exists, or (3) all
steps were not completed in the proper sequence. In that case, the unit will revert to
previous calibration constants.

After saving constants, lock out calibration by sending :CAL:PROT:LOCK.

Changing the calibration code

The default calibration code may be changed from the front panel (Model 2303 and 2303-PJ

only) or via remote (Models 2303, 2303B, and 2303-PJ) as discussed below.

Changing the code from the front panel

Follow the steps below to change the Model 2303 of 2303-PJ code from the front panel:

1. Press the MENU key, then choose CALIBRATE UNIT, and press ENTER. The instru­ment will display the last date calibrated:

CALIBRATE UNIT

LAST ON 02/01/97

2. Press the up arrow key. The instrument will display the number of times it was calibrated:

CALIBRATE UNIT

TIMES= 01

3. Press the up arrow key. The unit will then prompt you to run calibration:

CALIBRATE UNIT

RUN

4. Press ENTER. The unit will then prompt for the calibration code:

CALIBRATE UNIT

Cal Code KI002303

5. Using the edit keys, set the display to the current present calibration code, then press
ENTER. (Default: KI002303.) The unit will then prompt you as to whether or not to
change the code:

CALIBRATE UNIT

Change Code NO

6. Select YES, then press ENTER. The instrument will then prompt you to change the code:

CALIBRATE UNIT

New Code: KI002303

7. Use the edit keys to set the new code, then press ENTER to accept the new code.

8. Press the MENU key to exit calibration and return to the main menu.

Calibration 2-21

Changing the code by remote

To change the Model 2303, 2303B, or 2303-PJ calibration code by remote, first send the
present code, then send the new code. For e xample, the following command sequence changes
the code from the 'KI002303' remote default to 'KI_CAL':

:CAL:PROT:CODE 'KI002303'
:CAL:PROT:CODE 'KI_CAL'

You can use any combination of letters and numbers up to a maximum of eight characters.

2-22 Calibration

Resetting the calibration code

If you lose the calibration code, you can unlock calibration by temporarily shorting together
the CAL pads, which are located on the digital board, while turning on the power. Since the dig­ital board is located under the analog board, it may be necessary to use extender wires or to
remove the analog board to gain access.

V iewing calibration date and count

Viewing date and count from the front panel

Follow the steps below to view the Model 2303 or 2303-PJ calibration date and count from
the front panel:

1. Press the MENU key, then choose CALIBRATE UNIT, and press ENTER. The instru­ment will display the last date calibrated:

CALIBRATE UNIT

LAST ON 02/01/97

2. Press the up arrow key. The instrument will display the number of times it was calibrated:

CALIBRATE UNIT

TIMES= 01

3. Press MENU to return to the menu structure.

Acquiring date and count by remote

Use the :DATE? and :COUNT? queries to determine the Model 2303, 2303B, or 2303-PJ cal­ibration date and count respectively. See Miscellaneous commands in Appendix B for more
details.

3

Disassembly

3-2 Disassembly

Introduction

This section explains how to handle, clean, and disassemble the Models 2303, 2303B, and
2303-PJ. Disassembly drawings are located at the end of this section.

WARNING The procedures in this section are intended only for qualified service per-

sonnel. Disconnect the line cord and all test leads and wires from the instru­ment before disassembling the unit.

Handlingand cleaning

To avoid contaminating PC board traces with body oil or other foreign matter, avoid touching
the PC board traces while you are repairing the instrument. Some circuit board areas have high­impedance devices or sensitive circuitry where contamination could cause degraded
performance.

HandlingPCboards

Observe the following precautions when handling PC boards:

• Wear cotton gloves.

• Only handle PC boards by the edges and shields.

• Do not touch any board traces or components not associated with repair.

• Do not touch areas adjacent to electrical contacts.

• Use dry nitrogen gas to clean dust off PC boards.

Solder repairs

Observe the following precautions when soldering a circuit board:

• Use an OA-based (organic activated) flux, and take care not to spread the flux to other
areas of the circuit board.

• Remove the flux from the work area when you have finished the repair by using pure
water with clean, foam-tipped swabs or a clean, soft brush.

• Once you have removed the flux, swab only the repair area with methanol, then blow
dry the board with dry nitrogen gas.

• After cleaning, allow the board to dry in a 50°C, low-humidity environment for sev­eral hours.

Static sensitivedevices

CMOS devices operate at very high impedance levels. Therefore, any static that builds up on
you or your clothing may be sufficient to destroy these devices if they are not handled properly.
Use the following precautions to avoid damaging them:

CAUTION Many CMOS devices are installed in the Model 2303. Handle all semicon-

ductor devices as being static sensitive.

• Transport and handle ICs only in containers specially designed to prevent static build­up. Typically, you will receive these parts in anti-static containers made of plastic or
foam. Keep these devices in their original containers until ready for installation.

• Remove the devices from their protective containers only at a properly grounded work
station. Also, ground yourself with a suitable wrist strap.

• Handle the devices only by the body; do not touch the pins.

• Ground any printed circuit board into which a semiconductor device is to be inserted
to the bench or table.

• Use only anti-static type desoldering tools.

• Use only grounded-tip solder irons.

• Once the device is installed in the PC board, it is normally adequately protected, and
you can handle the boards normally.

Assemblydrawings

Use the assembly drawings located at the end of this section to assist you as you disassemble
and re-assemble the Model 2303. Also, refer to these drawings for information about the
Keithley part numbers of most mechanical parts in the unit.

Disassembly 3-3

Assembly drawings include:

• Front Panel Assembly — 2303-040, 2303B-040, 2303-PJ-040

• Chassis Assembly — 2303-050, 2303B-050

• Analog Board To Chassis Assembly — 2303-051, 2303B-051, 2303-PJ-051

• Final Chassis Assembly — 2303-052, 2303B-052, 2303-PJ-052

Disassembly procedures

Case cover removal

Follow the steps below to remove the case cover to gain access to internal parts.

WARNING Before removing the case cover, disconnect the line cord and any test leads

from the instrument.

1. Remove Handle — The handle serves as an adjustable tilt-bail. Adjust its position by
gently pulling it away from the sides of the instrument case and swinging it up or down.
To remove the handle, swing the handle below the bottom surface of the case and back
until the orientation arrows on the handles line up with the orientation arrows on the
mounting ears. With the arrows lined up, pull the ends of the handle away from the case.

3-4 Disassembly

NOTE When re-installing the mounting ears, make sure to mount the right ear to the right

Analog boardremoval

cover is already removed.

2. Remove Mounting Ears — Remove the screw that secures each mounting ear. Pull down
and out on each mounting ear.

side of the chassis, and the left ear to the left side of the chassis. Each ear is marked
“RIGHT” or “LEFT” on its inside surface.

3. Remove Rear Bezel — To remove the rear bezel, loosen the two screws that secure the
rear bezel to the chassis, then pull the bezel away from the case.

4. Removing Grounding Screws — Remove the two grounding screws that secure the case
to the chassis. They are located on the bottom of the case at the back.

5. Remove Chassis — To remove the case, grasp the front of the instrument, and carefully
slide the case off the chassis to the rear.

Perform the following steps to remove the analog board. This procedure assumes that the case

1. Unplug all cables connected to the analog board.

2. Remove the six screws that secure the analog board to the chassis.

3. After all screws have been removed, carefully lift the analog board assembly free of the
main chassis.

Digitalboardremoval

Perform the following steps to remove the digital board. This procedure assumes that the

analog board assembly has already been removed.

1. Remove the IEEE-488 connector fasteners that attach the connector to the rear panel.

2. To remove the POWER switch rod, place the edge of a flat-blade screw driver in the
notch on the pushrod, then gently twist the screw driver while pulling the rod from the
shaft.

3. Disconnect all cables and wires connected to the digital board.

4. Remove the front panel by prying out the four retaining clips while pulling the front
panel away from the chassis.

5. Remove the digital board by sliding it forward until it is free of the guide pins, then slide
the board forward toward the front of the chassis until it can be pulled free.

During re-assembly, replace the board, and start the IEEE-488 connector nuts. Tighten all the

fasteners once they are all in place and the board is correctly aligned.

Frontpaneldisassembly

Follow the steps below to disassemble the front panel (Models 2303 and 2303-PJ only). The
procedure assumes that the front panel has already been removed from the chassis as described
above.

1. Remove the four screws that secure the display board to the front panel.

2. Remove the display board from the front panel.

Removingmechanicalcomponents

The following procedures to remove the fan and line filter require that the case cover, front

panel, and digital and analog circuit boards have been removed, as previously explained.

Fan removal

Perform the following steps to remove the fan:

1. Remove the four screws that secure the fan to the rear panel.

2. Remove the fan from the chassis.

Linefilterremoval

To remove the line filter, squeeze the latches on either side while pushing the line filter from

the access hole on the rear panel.

Instrumentre-assembly

Re-assemble the instrument by reversing the previous disassembly procedures. Make sure

that all parts are properly seated and secured, and that all connections are properly made.

Disassembly 3-5

WARNING To ensure continued protection against electrical shock, verify that power

line ground (green and yellow wire attached to the line filter module) is con­nected to the chassis. Also make certain that the two bottom case screws are
properly installed to secure and ground the case cover to the chassis.

3-6 Disassembly

4-2 Replaceable Parts

Introduction

This section contains replacement parts information for both the Models 2303, 2303B, and
2303-PJ.

Ordering information

To place an order, or to obtain information concerning replacement parts, contact your
Keithley representative or the factory. When ordering parts, be sure to include the following
information:

• Instrument model number (Model 2303, 2303B, or 2303-PJ)

• Instrument serial number

• Part description

• Component designation (if applicable)

• Keithley part number

Factory service

If the instrument is to be returned to Keithley Instruments for repair, perform the following:

• Call the Repair Department at 1-800-552-1115 for a Return Material Authorization
(RMA) number.

• Complete the service form at the back of this manual, and include it with the instru­ment.

• Carefully pack the instrument in the original packing carton or equivalent.

• Write ATTENTION REP AIR DEPARTMENT and the RMA number on the shipping
label.

Parts lists and component layouts

The parts lists for the Models 2303, 2303B, and 2303-PJ are listed separately in tables on the
following pages. For part numbers to the various mechanical parts and assemblies, use the as­sembly drawings provided at the end of
the end of this section:

• Digital board – 2303-100

• Analog board – 2303-120

• Display board – 2304-110

Section 3 . Component layout drawings are provided at

Replaceable Parts 4-3

Models 2303 and 2303-PJ parts lists

Table 4-1

Models 2303 and 2303-PJ digital board parts list

Circuit designation Description Keithley part no.

C100,111,117,122,124,128,151-153,213 CAP, .1UF, 20%, 50V, CERAMIC C-418-.1
C101,C102,C105,C115 CAP, .1UF, 10%, 25V, CERAMIC C-495-.1
C106,C150,C265 CAP, 1000PF, 10%, 50V, MONO CERAMIC C-452-1000P
C107,C108,C129,C133 CAP, 22U, 20%, 25V, TANTALUM C-535-22
C109,C184 CAP, 1000PF, 20%, 50V, CERAMIC C-418-1000P
C110,C112,C116,C120,C130,C141,C161,

C162
C113 CAP, 68PF, 10%, 100V, CERAMIC C-451-68P
C114,C145 CAP, 22PF, 10%, 100V, CERAMIC C-451-22P
C118,C138 CAP, 2200P, 1%, 50V, CERAMIC C-532-2200P
C119,C148,C156 CAP, 100PF, 5%, 100V, CERAMIC C-465-100P
C123,134,269,139,147 CAP, 10UF,20%, 25V, TANTALUM C-440-10
C125,126,274,149,154,155,196,275 CAP, .1UF, 10%, 25V, CERAMIC C-495-.1
C127,C146 CAP, 470P, 10%, 100V, CERAMIC C-451-470P
C135,C266 CAP, 2.2U, 10%, 50V, TANTALUM C-563-2.2
C136,157,165,189,193,282,204,121,103 CAP,.1UF, 20%,50V,CERAMIC C-418-.1
C143 CAP, 270PF, 5%, 100V, CERAMIC C-465-270P
C158 CAP, .01UF, 20%, 50V, CERAMIC C-418-.01
C159 CAP, .022UF, 10%, 50V, CERAMIC C-491-.022
C160,142,166,197,264,276 CAP, 22UF, 20%, 25V, TANTALUM C-440-22
C163,C190,C195 CAP, .01UF, 10%, 50V, CERAMIC C-491-.01
C167 CAP, 4700PF, 20%, 50V, CERAMIC C-418-4700P
C171,C188 CAP, 47P, 5%, 100V, CERAMIC C-465-47P
C173,C183 CAP, 2200P, 10%, 100V, CERAMIC C-430-2200P
C179,C185,C212,C214 CAP, 1000P, 10%, 100V, CERAMIC C-451-1000P
C181 CAP, 220UF, +/-20%, 50V, ALUM ELEC C-507-220
C191,C192,C168 CAP, 15P, 1%, 100V, CERAMIC C-512-15P
C194 CAP, .1UF, 10%, 25V, CERAMIC C-495-.1
C215-222,225-230,238,241,244,246-248 CAP, .1UF, 20%,50V, CERAMIC C-418-.1
C223,C224,C273 CAP, .47U, 20%, 25V C-520-.47
C233,C234,C235 CAP, .1UF, 20%,50V, CERAMIC C-418-.1
C236,C239,C277 CAP, 1UF, 20%, 35V, TANTALUM C-494-1
C237,C240 CAP, 22PF, 10%, 100V, CERAMIC C-451-22P
C245,C249,C258,C164 CAP, 47P, 5%, 100V, CERAMIC C-465-47P
C250,C251 CAP, .01UF, 10%, 50V, CERAMIC C-491-.01

CAP, .01UF, 10%, 50V, CERAMIC C-491-.01

4-4 Replaceable Parts

Table 4-1 (continued)

Models 2303 and 2303-PJ digital board parts list

Circuit designation Description Keithley part no.

C252,253,255-257,259-263,271,169,270 CAP, .1UF, 20%, 50V, CERAMIC C-418-.1
C254 CAP, 100PF, 5%, 100V, CERAMIC C-465-100P
C280,281,172,174-177,180,182,186,187 CAP, .1UF, 10%, 25V, CERAMIC C-495-.1
C285 CAP, .15UF, 20%,50V, CERAMIC C-418-.15
C286 CAP, .047U, 10%, 50V, CERAMIC C-491-.047
C288,C289 CAP, .1UF, 20%, 50V, CERAMIC C-418-.1
C293 CAP, .01UF, 20%, 50V, CERAMIC C-418-.01
C294,C284 CAP, .47, 10% 16V, CERAMIC C-565-.47
CR100,CR101,CR110,CR111 DIODE, SWITCHING, MMSD914T19 RF-112
CR104 DIODE, DUAL HSM-2822T31 RF-95
J1002 CONN, MOLEX, 3-PIN CS-772-3
J1003 CONN, RIGHT ANGLE,24PIN CS-507
J1005 SHIELDED RT. ANGLE PHONE JACK CS-981
J1006, J1013,J1015 LATCHING HEADER, FRICTON, SGL

ROW
L101 EMI SUPPRESSION INDUCTOR CH-84
L103,L104,L105,L109 FERRITE CHIP 600 OHM BLM32A07 CH-62
L106,L107,L108 FERRITE CHIP 600 OHM BLM32A07 CH-62
P1007 CABLE ASSEMBLY, 26 CONDUCTOR CA-27-6
P1008 CABLE ASSEMBL Y WITH GROUND

PLANE
P1009 CABLE ASSEMBL Y CA-62-4B
P1010 CABLE ASSEMBL Y CA-171-1A
PS100 POWER SUPPLY PS-64A
Q100-102,104-106,111,123 TRANS, NPN, MMBT3904 TG-238
Q103,107,109,110,112 TRANS, N-MOSFET, VN0605T TG-243
Q108 TRANS, PNP, MMBT3906L TG-244
Q122 TRANS, P-CHAN, MOSFET, TP0610T TG-259
R100,R169 RES, 200, 1%, 100MW, THICK FILM R-418-200
R101,112,143,150,176,177,181,186,187,189 RES, 475, 1%, 100MW, THICK FILM R-418-475
R102 RES, 6.04K, 1%, 100MW, THICK FILM R-418-6.04K
R103,155,254,163,174,185,255 RES, 10K, 1%, 100MW, THICK FILM R-418-10K
R105 RES, 4.99K, 1%, 100MW, THICK FILM R-418-4.99K
R106,R162 RES, 16.9K, 1%, .125W, METAL FILM R-391-16.9K
R107,R158,R191,R118 RES, 1K, 1%, 100MW, THICK FILM R-418-1K
R109,110,115,120-122,126,127,129,119,227 RES, 10K, 1%, 100MW, THICK FILM R-418-10K
R111,R165 RES, 4.02K,1%, 100MW, THICK FILM R-418-4.02K

CS-724-3

CA-152-2B

Replaceable Parts 4-5

Table 4-1 (continued)

Models 2303 and 2303-PJ digital board parts list

Circuit designation Description Keithley part no.

R113,R156 RES, 24.3, 1%, 100MW, THICK FILM R-418-24.3
R114 RES, 332K,1%, 100MW, THICK FILM R-418-332K
R116,R167 RES, 2K, 1%, 100MW, THICK FILM R-418-2K
R117,R168 RES, 2K, 1%, 125MW, METAL FILM R-391-2K
R123,R170,R172 RES, 8.06K, 1%, .1W, THICK FILM R-418-8.06K
R124,R125,R188 RES,1K, 5% 250MW, METAL FILM R-376-1K
R128,R151,R232,R273 RES, 1K, 1%, 100MW, THICK FILM R-418-1K
R130,R225,R243 RES, 4.75K, 1%, 100MW, THICK FILM R-418-4.75K
R133 RES, 1.5K, 5%, 250MW, METAL FILM R-376-1.5K
R137 RES, 66.5K, 1%, 100MW, THICK FILM R-418-66.5K
R141 RES, 1M, 1%, 100MW, THICK FILM R-418-1M
R144,R145,R146,R149 RES, 10K, .1%, .125W, THIN FILM R-456-10K
R147,R148 RES, 20K, .1%, .125W, THIN FILM R-456-20K
R153 RES, 49.9K, 1%, 100MW, THICK FILM R-418-49.9K
R154 RES, 10M, 1%, 125MW, THICK FILM R-418-10M
R164 RES, 1M, 1%, 100MW, THICK FILM R-418-1M
R166 RES, 150K, 1%, 100MW, THICK FILM R-418-150K
R171,R180,R192,R197 RES, 100, 1%, 100MW, THICK FILM R-418-100
R175 RES, 10, 10%, 100MW, THICK FILM R-418-10
R182 RES, 1K, 1%, 125MW, METAL FILM R-391-1K
R183 RES NET TF-245
R184 RES, 1.28M, .1%, 1/8W, METAL FILM R-176-1.28M
R190,193-196,269 RES, 475, 1%, 100MW, THICK FILM R-418-475
R198 RES, 499, 1%, 100MW, THICK FILM R-418-499
R199 RES, 15k, 1%, 100MW, THICK FILM R-418-15K
R221 RES, 866, 1%, 100MW, THICK FILM R-418-866
R223,R231 RES, 10M, 1%, 125MW, THICK FILM R-418-10M
R226,R142 RES, 10K, 1%, 100MW, THICK FILM R-418-10K
R230,247,250,132,134,152,222,224,135 RES, 10K, 1%, 100MW, THICK FILM R-418-10K
R235,R238 RES, 2K, 1%, 100MW, THICK FILM R-418-2K
R236,R237 RES, 2.21K, 1%, 100MW, THICK FILM R-418-2.21K
R239 RES, 6.04K, 1%, 125MW, THIN FILM R-423-6.04K
R240,R108,R279 RES, 100K, 1%, 100MW, THICK FILM R-418-100K
R241 RES, 3.01K, 1%, 125MW, METAL FILM R-391-3.01K
R242,R252 RES, 100, 1%, 100MW, THICK FILM R-418-100
R244 RES, 82.5, 1%, 100MW, THICK FILM R-418-82.5

4-6 Replaceable Parts

Table 4-1 (continued)

Models 2303 and 2303-PJ digital board parts list

Circuit designation Description Keithley part no.

R245 RES, 34K, 1%, 100MW, THICK FILM R-418-34K
R246,R270,R272 RES, 475, 1%, 100MW, THICK FILM R-418-475
R248 RES, 470, 5%, 125MW, METAL FILM R-375-470
R249 RES, 5.11K, 1%, 100MW, THICK FILM R-418-5.11K
R251 RES, 49.9K, 1%, 100MW, THICK FILM R-418-49.9K
R253 RES, 6.04K, 1%, 100MW, THICK FILM R-418-6.04K
R260 RES, 4.02K, 1%, 100MW, THICK FILM R-418-4.02K
R263 RES, 20K, 1%, 100MW THICK FILM R-418-20K
R264 RES, 24.9K, 1%, 100MW, THICK FILM R-418-24.9K
R278 RES, 15k, 1%, 100MW, THICK FILM R-418-15K
R280 RES, 249K, 1%, 100MW, THICK FILM R-418-249K
R289 RES, 332, 1%, 100MW, THICK FILM R-418-332
R290 RES, 909, 1%, 1W, THICK FILM R-418-909
RT102 THERMISTER, PD=7MW/DEG C, 1500V,

613.74K
RV100 METAL OXIDE VARISTOR VR-7
RV102 VARISTOR VR-14
S100 SWITCH, PUSHBUTTON (6 POLE) SW-466
TP100-109,111,112 CONNECTOR CS-985
U100 RS-232 LINE DRIVER/RECEIVER IC-1129
U101,U128 IC, VOLT. COMPARATOR, LM311M IC-776
U102 12-BIT VOLTAGE OUTPUT DAC IC-1130
U103 IC, +5V VOLTAGE REGULATOR,

LM2940CT
U104,U115 HIGH SPEED PWM CONTROLLER IC-1119
U106 IC, 8-CHAN ANA MULTIPLEXER,

DG408DY
U107 LOW NOISE OPAMP IC-1127
U108 IC, 8 STAGE SHIFT/STORE, MC14094BD IC-772
U109 HIGH PRECISION 10V REFERENCE IC-1121
U110A IC, DUAL SER INPUT VLTG OUTPUT,

12BITMDAC
U111 IC, OP-AMP, AD705JR IC-814
U113 IC +5V RS-232 TRANSCEIVER, MAX202 IC-952
U114,U149 IC, VOLT COMPARATOR LM393D IC-775
U116 IC, OPTOCOUPLER, 2601 IC-239

RT-8

IC-576

IC-844

IC-973

Replaceable Parts 4-7

Table 4-1 (continued)

Models 2303 and 2303-PJ digital board parts list

Circuit designation Description Keithley part no.

U117 IC, QUAD D FLIP FLOP W/CLK, RESET

IC-923

74HC175

U118 IC, NCHAN LAT DMOS QUADFET,

IC-893

SD5400CY
U119,U125 IC, QUAD 2 IN NOR, 74HCT02 IC-809
U120 IC, QUAD 2-INPUT NAND, 74HC00M IC-781
U121 SILICON-GATE CMOS IC-1123
U122,U142,U133 IC, DUAL HIGH CMR/SPEED OPTO,

IC-588

HCPL-2631
U123 PROGRAMMED ROM 2303-803A**
U124 LARGE SCALE IC LSI-162-70
U127 IC, MOT MC68331CPV16 LSI-188
U129 INTEGRATED CIRCUIT, OPA177GS IC-960
U130 DUAL DECADE RIPPLE COUNTER IC-1131
U131 IC, OCTAL INTERFACE BUS, 75160 IC-646
U132 IC, DUAL BIPOLAR OP-AMP, LT1124CS8 IC-955
U134 PRECISION BIFET OPAMP IC-1194
U135 IC, OP-AMP, NE5534D IC-802
U136 PROGRAMMED ROM 2000-802**
U137 IC, GPIB ADAPTER, 9914A (PLCC) LSI-123
U138 QUAD SPST ANALOG SWITCH IC-1211
U140,U148,U139 IC, POS NAND GATES/INVERT, 74HCT14 IC-656
U141 IC, OCTAL INTER BUS TRANS, 75161 IC-647
U145 IC, SERIAL EPROM 24LC16B LSI-153
U147 IC, DUAL D-TYPE F/F, 74HC74 IC-773
U154 CMOS AN ALOG SWITCH IC-1210
VR100,VR102 DIODE, ZENER, 6.2V, MMSZ6V2 DZ-97
VR101 DIODE, ZENER 6.44V, IN4577AGED DZ-58
Y100 OSCILLATOR HIGH SPEED CMOS

CR-37

12MHZ
Y101 CRYSTAL, FSM327 CR-41

** Order present firmware revision level

.

4-8 Replaceable Parts

Table 4-2

Models 2303 and 2303-PJ analog board parts list

Circuit designation Description Keithley part no.

C301,308,310,312,313,320,325,329,333,337 CAP, .1UF, 10%, 25V, CERAMIC C-495-.1
C302,C489,C506 CAP, 1UF, 20%, 50V, TANTALUM C-431-1
C303,C309 CAP, 7.5P, 10%, 100V, CERAMIC C-452-7.5P
C304,488,307,315,317,321,328,338,339,346 CAP, .1UF, 20%,50V, CERAMIC C-418-.1
C314,335,336,371,372,377,378 CAP, 47UF, 20%, 100V, ALUM ELEC C-521-47
C319,C498,C306,C330 CAP, 4.7PF, 5%, 50V, MONO-CERAMIC C-452-4.7P
C322,331,359-361,374,343,434,508 CAP, 22UF, 20%, 25V, TANTALUM C-440-22
C323,C416,C422 CAP, 22U, 20%, 25V, TANTALUM C-535-22
C326,C404,C487 CAP, 1UF, 20%, 35V, TANTALUM C-494-1
C334 CAP, 100UF, 20%, 25V, ALUM ELEC C-413-100
C347,C478 CAP, 470U, 20%, 25V, ALUM ELEC C-478-470
C348,351,366,417,486 CAP, .1UF, 10%, 25V, CERAMIC C-495-.1
C352,354,355,358,373,379,382,384,515-519 CAP, .1UF, 20%, 50V, CERAMIC C-418-.1
C353,C357,C367 CAP, 1000P, 10%, 100V, CERAMIC C-451-1000P
C356,C499,C500 CAP, 100PF, 5%, 100V, CERAMIC C-465-100P
C362,C509 CAP, 220PF, 10%, 100V, CERAMIC C-451-220P
C363,C480,C481 CAP, 3300P, 10%, 500V, CERAMIC C-497-3300P
C365 CAP, 2200P, 1%, 50V, CERAMIC C-532-2200P
C368,C369 CAP, 100UF, 20%, 16V, TANTALUM C-504-100
C370,C305 CAP, 2.2U, 10%, 50V, TANTALUM C-563-2.2
C376 CAP, .022UF, 10%, 50V, CERAMIC C-491-.022
C390,407,414,415,423,424,494,495,435-437 CAP, .1UF, 20%, 50V, CERAMIC C-418-.1
C392,C393,C350,C491 CAP, .01, 5%, 50V, NPO C-514-.01
C394,C396 CAP, 1500P, 20%, 700V C-560-1500P
C395 CAP, 10U, 20%, 35V, ALUMINUM C-562-10
C402,C397 CAP, 47PF, 10%, 100V, CERAMIC C-451-47P
C405,C421 CAP, .033U, 10%, 50V, CERAMIC C-491-.033
C406,C410 CAPACITOR C-570-470
C426-429,344,345,479,482,483 CAPACITOR SMT C-568-2200P
C438-C477,C505 CAP, 1U, 10%, 50V, CERAMIC C-564-1
C490 CAP, 100P, 10%, 100V CERAMIC C-451-100P
C492,C493 CAP, 390P, 10%, 100V, CERAMIC C-451-390P
C497,C514 CAP, 150PF, 5%, 100V,CERAMIC C-465-150P
C501,502,503,419,504,507,510,511,420 CAP, .1UF, 20%, 50V, CERAMIC C-418-.1
C512,C513,C380,C385,C318,C364 CAP, .1UF, 20%, 50V, CERAMIC C-418-.1
CR302,CR322,CR330,CR332,CR318 DIODE, SWITCHING, MMSD914T19 RF-112

Replaceable Parts 4-9

Table 4-2 (continued)

Models 2303 and 2303-PJ analog board parts list

Circuit designation Description Keithley part no.

CR303-306,308,309,311,312,319,327-329 DIODE, MBRS140T3 RF-110
CR307,CR310 SCHOTTKY BARRIER DIODE RF-108
CR313 ULTRA FAST BRIDGE RECTIFIER RF-123
CR314 DIODE, BRIDGE PE05 RF-48
CR315 DIODE, SILICON, 53A4 RF-47
CR323,CR324,CR325,CR326 SCHOTTKY DIODE RF-121
CR331 DIODE, BARRIER, MBR745 RF-65
HS301-309 HEAT SINK HS-55
HS310 HEAT SINK HS-41
J1007 CONN, HEADER STRAIGHT SOLDER

PIN
J1009 CONN, HEADER STRAIGHT SOLDER

PIN
J1010 CONN, MALE, 5-PIN (MOLEX 42491) CS-784-5
J1011 CONNECTOR, MODULES CS-834
L301,L302,L304,L305,L306 CHOKE, EMI CH-57
L303,L311 LINE FILTER CH-85-10
L308,L309 INDUCTOR CH-89-1
L310 CHOKE SMT CH-66-100
Q301 TRANS, CURRENT REGULATOR TG-341
Q304 TRANS, N CHANNEL FET, 2N4392 TG-128-1
Q305,Q306,Q307,Q308 TRANS, N CHANNEL JFET, SNJ132199 TG-294
Q310,Q311 TRANS, N CHANNEL FET, IRF530 TG-184
Q312 TRANS, NPN, MMBT3904 TG-238
Q313,315,314,332 HEXFET POWER MOSFET TG-354
Q323-326 RECTIFIER TG-337
Q327 TRANS, N-MOSFET, VN0605T TG-243
Q333 P CHANNEL MOSFET TG-363
Q334,Q335,Q330,Q331 HEXFET POWER MOSFET TG-358
Q338,Q341 PNP SILICON TRANSISTOR TG-310
Q339,Q340 NPN SILICON TRANSISTOR TG-309
Q342 TRANS, PNP, MMBT3906L TG-244
Q343 TRANS, N-CHAN JFET, SST4393 TG-263
R301,R302,R334,R336,R351 RES, 10K, .1%, .125W, THIN FILM R-456-10K
R304 RES, 24.9K, 1%, 100MW, THICK FILM R-418-24.9K
R306,R308,R313,R442,R490,R438 RES, 4.99K, 1%, 100MW, THICK FILM R-418-4.99K
R307 THICK FILM TF-262

CS-368-26

CS-368-16

4-10 Replaceable Parts

Table 4-2 (continued)

Models 2303 and 2303-PJ analog board parts list

Circuit designation Description Keithley part no.

R315,372,314,492,415,441,458-460 RES, 10K, 1%, 100MW, THICK FILM R-418-10K
R320,R444 RES, 100K, 1%, 100MW, THICK FILM R-418-100K
R321,R503 RES, 1M, 1%, 100MW, THICK FILM R-418-1M
R322,R489 RES, 8.06K, 1%, .1W, THICK FILM R-418-8.06K
R325 RES, 10, 10%, 100MW, THICK FILM R-418-10
R326 RES, 14K, 1%, 125MW, METAL FILM R-391-14K
R329-332,357,358,360,361,378,379,390,391 RES, 10K, 5%, 250MW, METAL FILM R-376-10K
R333,R335,R349,R355 RES, 20K, 5%, 250MW, METAL FILM R-376-20K
R337,R343,R344,R456,R457,R476,R477,

RES, 1K, 1%, 100MW, THICK FILM R-418-1K

R499
R340,R341 RES, 1K, 5% 250MW, METAL FILM R-376-1K
R342 RES, 24.3, 1%, 100MW, THICK FILM R-418-24.3
R345,R346,R347,R348 RES, 560, 5%, 250MW, METAL FILM R-376-560
R350,368,426-428,435,328,339 RES, 10,5%, 125MW, METAL FILM R-375-10
R352,R478,R491 RES, 20K, 1%, 100MW, THICK FILM R-418-20K
R353,354,461,473,495,496 RES, 475, 1%, 100MW, THICK FILM R-418-475
R363,R370 RES, 8,98K, .1%, .125W, THIN FILM R-456-8.98K
R364,R369 RES, 1K, .1%, .125W, THIN FILM R-456-1K
R373,R374,R387,R392 RES, 20K, 1%, 125MW, METAL FILM R-391-20K
R375,R377 RES, 1K, 5%, 1W 200V, THICK FILM R-437-1K
R376 RES, 100, .1%, 1/2W, METAL FILM R-169-100*
R376 RES, 1, 1%, 1W, METAL FILM R-487-1**
R383,R385,R386,R388 RES, 49.9K, 1%, 125MW, METAL FILM R-391-2.87K
R384 RES, 4.02K, 1%, 100MW, THICK FILM R-418-4.02K
R393,R394 RES, .02, 1.5W, 1% R-468-.02
R397 RES, 357, 1%, 100MW, THICK FILM R-418-357
R399,R400,R488 RES, .0499, 1%, 100MW, THICK FILM R-418-.0499
R401 RES, 301, 1%, 100MW, THICK FILM R-418-301
R411,413,417,419,474,483 RES, 100, 1%, 100MW, THICK FILM R-418-100
R421,R422,R480 RES, 200K, 1%, 125MW, METAL FILM R-391-200K
R429,433,434,436,356,371 RES, 7.5, 5%, .5W, THICK FILM R-469-7.5
R432 RES, 3.01K, 1%, 100MW, THICK FILM R-418-3.01K
R455 RES, .1, 1%, 3W R-475-.1

* Model 2303 only.
** Model 2303-PJ only.

Replaceable Parts 4-11

Table 4-2 (continued)

Models 2303 and 2303-PJ analog board parts list

Circuit designation Description Keithley part no.

R462-464,467,468 RES, 10K, 1%, 100MW, THICK FILM R-418-10K
R465,R494 RES, 11K, 1%, 100MW, THICK FILM R-418-11K
R469 RES, 49.9K, 1%, 100MW, THICK FILM R-418-49.9K
R470,R497 RES, .2, 1%, 30W R-463-.2
R471 RES, .1, 1%, 30W R-463-.1
R475,R484 RES, 47.5, 1%, 100MW THICK FILM R-418-47.5
R479 RES, 20K, .1%, .125W THIN FILM R-456-20K
R481,R482 RES, 4.99K, .1%, .125W THIN FILM R-456-4.99K
R493 RES, 45.3K, 1%, 100MW THICK FILM R-418-45.3K
R498 RES, .2, 1%, 1W (2512) R-441-.2
R500,R501,R502,R507 RES, 18,5%, 1W 200V THICK FILM R-437-18
T301 TRANSFORMER TR-314A
TP301-310,311,314,316-318 CONNECTOR CS-985
U301,U321 DUAL FET OPAMP IC-1128
U302,U304,U308,U316,U335 PRECISION BIFET OPAMP IC-1194
U303 IC, QUAD 2 IN AND, 74HCT08 IC-837
U305,U307 IC, VOLTAGE REGULATOR, LM340-12 IC-60
U306,U311,U322,U330 IC, VOLT COMPARATOR, LM393D IC-775
U310 MICR OPO WER V OL TAGE REGULA TOR IC-1152
U312 LOW POWER INSTRUMENT AMP IC-1124
U313 IC, NEG VOLTAGE REG -15V, 500MA,

79M15
U314 HIGH SPEED PWN CONTROLLER IC-1120
U315 IC,+5V V OLTA GE REGULA-

TOR,LM2940CT
U317 DUAL ± 15V ZERO DRIFT OPAMP IC-1126
U320 IC,POS VOLTAGE REG +15V ,500MA,

78M15
U324 IC, CMOS ANAL SWITCH, DG444DY, IC-866
U327 80V 2.5A FULL BRIDGE FET DRIVER IC-1139
U329 IC, VOLT. COMPARATOR, LM311M IC-776
U333 POWER OUTPUT STAGE AUTO BIAS IC-1159
U334,U336 IC, DUAL OP-AMP, LF353M IC-842
VR303,VR310 DIODE, ZENER, 6.8V, MMSZ5235BT1 DZ-100
VR305,VR312 DIODE, ZENER MM524694 TI DZ-113
VR306,VR307 DIODE, ZENER 6.0V, BZX84B6V2 DZ-87
VR311 DIODE, ZENER DZ-121

IC-195

IC-576

IC-194

4-12 Replaceable Parts

Table 4-3

Models 2303 and 2303-PJ display board parts

Circuit designation Description Keithley part no.

C601,C602 CAP, 33PF, 10%, 100V, CERAMIC C-451-33P
C603 CAP, .1UF, 10%, 25V, CERAMIC C-495-.1
C609 CAP, .1UF, 10%, 25V, CERAMIC C-495-.1
C611 CAP, 10UF,20%, 25V, TANTALUM C-440-10
C613 CAP, 1U, 10%, 50V, CERAMIC C-564-1
J1008 CONN, HEADER STRAIGHT SOLDER

CS-368-10

PIN
J1013 CONNECTOR, RIGHT ANGLE CS-362
J1014 CONN, BERG CS-339
L601,L602,L603,L604 FERRITE CHIP 600 OHM BLM32A07 CH-62
R601 RES, 10M, 5%, 125MW, METAL FILM R-375-10M
R602-605,611,614,616,618,620,623,625 RES, 10K, 1%, 100MW, THICK FILM R-418-10K
R606,608,610,613,615,617,619,621 RES, 15k, 1%, 100MW, THICK FILM R-418-15K
R607,R609 RES, 20, 1%, 100MW, THICK FILM R-418-20
R612 RES, 4.75K, 1%, 100MW, THICK FILM R-418-4.75K
R622 RES, 15k, 1%, 100MW, THICK FILM R-418-15K
R624 RES, 604, 1%, 100MW, THICK FILM R-418-604
R V601,RV602 300W TRANSIENT V OLT AGE SUPPRES-

VR-13

SOR
S0601 SOCKET SO-143-44
U601 UNDERVOLTAGE SENSE CIRCUIT IC-1067
U603 PROGRAMMED ROM 2304-800**
Y601 CRYSTAL, 4MHZ CR-36-4M

**Order present firmware revision level.

Table 4-4

Models 2303 and 2303-PJ mechanical parts list

Replaceable Parts 4-13

Qty. Description

1 BEZEL, REAR 428-303D
1 CHASSIS 2304-301
1 COVER 2000-307C
1 FAN FN-34-1
2 FOOT 428-319A
2 FOOT, EXTRUDED FE-22A
2 FOOT, RUBBER FE-6
1 FUSE, 2A, 250V, TIME LAG (5X20MM) F100 FU-81
1 HANDLE 428-329F
1 IEEE CONNECTOR, HARDWARE KIT CS-713
1 LINE CORD CO-7
1 LINE FILTER LF-11
1 MEMBRANE SWITCH FRONT PANEL 2303-313A
1 MOUNTING EAR, LEFT 428-338B
1 MOUNTING EAR, RIGHT 428-328E
1 POWER ROD 704-313A
1 REAR PANEL 2304-303

Keithley
part no.

4-14 Replaceable Parts

Model 2303B parts lists

Table 4-5

Model 2303B digital board lists

Circuit designation Description Keithley part no.

C100,111,117,122,124,128,151-153,213 CAP, .1UF, 20%, 50V, CERAMIC C-418-.1
C101,C102,C105,C115 CAP, .1UF, 10%, 25V, CERAMIC C-495-.1
C106,C150,C265 CAP, 1000PF, 10%, 50V, MONO CERAMIC C-452-1000P
C107,C108,C129,C133 CAP, 22U 20%, 25V, TANTALUM C-535-22
C109,C184 CAP, 1000pF, 20%, 50V, CERAMIC C-418-1000P
C110,C112,C116,C120,C130,C141,C161,

C162
C113 CAP, 68PF, 10%, 100V, CERAMIC C-451-68P
C114,C145 CAP, 22PF, 10%, 100V, CERAMIC C-451-22P
C118,C138 CAP, 2200P, 1%, 50V, CERAMIC C-532-2200P
C119,C148,C156 CAP, 100PF, 5%, 100V, CERAMIC C-465-100P
C123,134,269,139,147 CAP, 10UF, 20%, 25V, TANTALUM C-440-10
C125,126,274,149,154,155,196,275 CAP, .1UF, 10%, 25V, CERAMIC C-495-.1
C127,C146 CAP, 470P, 10%, 100V, CERAMIC C-451-470P
C135,C266 CAP, 2.2U, 10%, 50V TANTALUM C-563-2.2
C136,157,165,189,193,282,204,121,103 CAP, .1UF, 20%, 50V, CERAMIC C-418-.1
C143 CAP, 270PF, 5%, 100V, CERAMIC C-465-270P
C158 CAP, .01uF, 20%, 50V, CERAMIC C-418-.01
C159 CAP, .022UF, 10%, 50V, CERAMIC C-491-.022
C160,142,166,197,264,276 CAP, 22UF, 20%, 25V, TANTALUM C-440-22
C163,C190,C195 CAP, .01UF, 10%, 50V, CERAMIC C-491-.01
C167 CAP, 4700PF, 20%, 50V, CERAMIC C-418-4700P
C171,C188 CAP, 47P, 5%, 100V, CERAMIC C-465-47P
C173,C183 CAP, 2200P, 10%, 100V, CERAMIC C-430-2200P
C179,C185,C212,C214 CAP, 1000P, 10%, 100V, CERAMIC C-451-1000P
C181 CAP, 220UF, ±20%, 50V, ALUM ELEC C-507-220
C191,C192,C168 CAP, 15P, 1%, 100V, CERAMIC C-512-15P
C194 CAP, .1UF, 10%, 25V, CERAMIC C-495-.1
C215-222,225-230,238,241,244,246-248 CAP, .1UF, 20%, 50V, CERAMIC C-418-.1
C223,C224,C273 CAP, .47U, 20%, 25V C-520-.47
C233,C234,C235 CAP, .1UF, 20%, 50V, CERAMIC C-418-.1
C236,C239,C277 CAP, 1UF, 20%, 35V, TANTALUM C-494-1
C237,C240 CAP, 22PF, 10%, 100V, CERAMIC C-451-22P
C245,C249,C258,C164 CAP, 47P, 5%, 100V, CERAMIC C-465-47P

CAP, .01UF, 10%, 50V, CERAMIC C-491-.01

Replaceable Parts 4-15

Table 4-5 (continued)

Model 2303B digital board lists

Circuit designation Description Keithley part no.

C250,C251 CAP, .01UF, 10%, 50V, CERAMIC C-491-.01
C252,253,255-257,259-263,271,169,270 CAP, .1UF, 20%, 50V, CERAMIC C-418-.1
C254 CAP,100PF, 5%, 100V, CERAMIC C-465-100P
C280,281,172,174-177,180,182,186,187 CAP, .1UF, 10%, 25V, CERAMIC C-495-.1
C285 CAP, .15UF, 20%, 50V, CERAMIC C-418-.15
C286 CAP, .047U, 10%, 50V, CERAMIC C-491-.047
C288,C289 CAP, .1UF, 20%, 50V, CERAMIC C-418-.1
C293 CAP, .01UF, 20%, 50V, CERAMIC C-418-.01
C294,C284 CAP, .47, 10% 16V CERAMIC C-565-.47
CR100,CR101,CR110,CR111 DIODE, SWITCHING, MMSD914T19 RF-112
CR104 DIODE, DUAL HSM-2822T31 RF-95
J1002 CONN, MOLEX, 3-PIN CS-772-3
J1003 CONN, RIGHT ANGLE, 24PIN CS-507
J1005 SHIELDED RT. ANGLE PHONE JACK CS-981
J1006, J1013,J1015 LATCHING HEADER, FRICTON, SGL

ROW
L101 EMI SUPPRESSION INDUCTOR CH-84
L103,L104,L105,L109 FERRITE CHIP 600 OHM BLM32A07 CH-62
L106,L107,L108 FERRITE CHIP 600 OHM BLM32A07 CH-62
P1007 CABLE ASSEMBLY, 26 CONDUCTOR CA-27-6
P1008 CABLE ASSEMBL Y WITH GROUND

PLANE
P1009 CABLE ASSEMBL Y CA-62-4B
P1010 CABLE ASSEMBL Y CA-171-1A
PS100 POWER SUPPLY PS-64A
Q100-102,104-106,111,123 TRANS, NPN, MMBT3904 TG-238
Q103,107,109,110,112 TRANS, N-MOSFET, VN0605T TG-243
Q108 TRANS, PNP, MMBT3906L TG-244
Q122 TRANS, P-CHAN, MOSFET, TP0610T TG-259
R100,R169 RES, 200, 1%, 100MW, THICK FILM R-418-200
R101,112,143,150,176,177,181,186,187,189 RES, 475, 1%, 100MW, THICK FILM R-418-475
R102 RES, 6.04K, 1%, 100MW, THICK FILM R-418-6.04K
R103,155,254,163,174,185,255 RES, 10K, 1%, 100MW, THICK FILM R-418-10K
R105 RES, 4.99K, 1%, 100MW, THICK FILM R-418-4.99K
R106,R162 RES, 16.9K, 1%, .125W, METAL FILM R-391-16.9K
R107,R158,R191,R118 RES, 1K, 1%, 100MW, THICK FILM R-418-1K
R109,110,115,120-122,126,127,129,119,227 RES, 10K, 1%, 100MW, THICK FILM R-418-10K

CS-724-3

CA-152-2B

4-16 Replaceable Parts

Table 4-5 (continued)

Model 2303B digital board lists

Circuit designation Description Keithley part no.

R111,R165 RES, 4.02K, 1%, 100MW, THICK FILM R-418-4.02K
R113,R156 RES, 24.3, 1%, 100MW, THICK FILM R-418-24.3
R114 RES, 332K,1%, 100MW, THICK FILM R-418-332K
R116,R167 RES, 2K, 1%, 100MW, THICK FILM R-418-2K
R117,R168 RES, 2K, 1%, 125MW, METAL FILM R-391-2K
R123,R170,R172 RES, 8.06K, 1%, .1W, THICK FILM R-418-8.06K
R124,R125,R188 RES, 1K, 5% 250MW, METAL FILM R-376-1K
R128,R151,R232,R273 RES, 1K, 1%, 100MW, THICK FILM R-418-1K
R130,R225,R243 RES, 4.75K, 1%, 100MW, THICK FILM R-418-4.75K
R133 RES, 1.5K, 5%, 250MW, METAL FILM R-376-1.5K
R137 RES, 66.5K, 1%, 100MW, THICK FILM R-418-66.5K
R141 RES, 1M, 1%, 100MW, THICK FILM R-418-1M
R144,R145,R146,R149 RES, 10K, .1%, .125W, THIN FILM R-456-10K
R147,R148 RES, 20K, .1%, .125W, THIN FILM R-456-20K
R153 RES, 49.9K, 1%, 100MW, THICK FILM R-418-49.9K
R154 RES, 10M, 1%, 125MW, THICK FILM R-418-10M
R164 RES, 1M, 1%, 100MW, THICK FILM R-418-1M
R166 RES, 150K, 1%, 100MW, THICK FILM R-418-150K
R171,R180,R192,R197 RES, 100, 1%, 100MW, THICK FILM R-418-100
R175 RES, 10, 10%, 100MW, THICK FILM R-418-10
R182 RES, 1K, 1%, 125MW, METAL FILM R-391-1K
R183 RES NET TF-245
R184 RES, 1.28M, .1%, 1/8W METAL FILM R-176-1.28M
R190,193-196,269 RES, 475, 1%, 100MW, THICK FILM R-418-475
R198 RES, 499, 1%, 100MW THICK FILM R-418-499
R199 RES, 15k, 1%, 100MW, THICK FILM R-418-15K
R221 RES, 866, 1%, 100MW THICK FILM R-418-866
R223,R231 RES, 10M, 1%, 125MW, THICK FILM R-418-10M
R226,R142 RES, 10K, 1%, 100MW, THICK FILM R-418-10K
R230,247,250,132,134,152,222,224,135 RES, 10K, 1%, 100MW, THICK FILM R-418-10K
R235,R238 RES, 2K, 1%, 100MW, THICK FILM R-418-2K
R236,R237 RES, 2.21K, 1%, 100MW, THICK FILM R-418-2.21K
R239 RES, 6.04K, 1%, 125MW, THIN FILM R-423-6.04K
R240,R108,R279 RES, 100K, 1%, 100MW, THICK FILM R-418-100K
R241 RES, 3.01K, 1%, 125MW, METAL FILM R-391-3.01K
R242,R252 RES, 100, 1%, 100MW, THICK FILM R-418-100

Replaceable Parts 4-17

Table 4-5 (continued)

Model 2303B digital board lists

Circuit designation Description Keithley part no.

R244 RES, 82.5, 1%, 100MW, THICK FILM R-418-82.5
R245 RES, 34K, 1%, 100MW, THICK FILM R-418-34K
R246,R270,R272 RES, 475, 1%, 100MW, THICK FILM R-418-475
R248 RES, 470,5%, 125MW, METAL FILM R-375-470
R249 RES, 5.11K, 1%, 100MW, THICK FILM R-418-5.11K
R251 RES, 49.9K, 1%, 100MW, THICK FILM R-418-49.9K
R253 RES, 6.04K, 1%, 100MW, THICK FILM R-418-6.04K
R260 RES,4.02K,1%,100MW, THICK FILM R-418-4.02K
R263 RES, 20K, 1%, 100MW THICK FILM R-418-20K
R264 RES, 24.9K, 1%, 100MW, THICK FILM R-418-24.9K
R278 RES, 15k, 1%, 100MW, THICK FILM R-418-15K
R280 RES, 249K, 1%, 100MW, THICK FILM R-418-249K
R289 RES, 332, 1%, 100MW, THICK FILM R-418-332
R290 RES, 909, 1%, 1W, THICK FILM R-418-909
RT102 THERMISTER, PD=7MW/DEG C, 1500V,

613.74K
RV100 METAL OXIDE VARISTOR VR-7
RV102 VARISTOR VR-14
S100 SWITCH, PUSHBUTTON (6 POLE) SW-466
SO100 FOR U123 SOCKET PLCC-032-T-A SO-143-32
TP100-109,111,112 CONNECTOR CS-985
U100 RS-232 LINE DRIVER/RECEIVER IC-1129
U101,U128 IC, VOLT. COMPARATOR,LM311M IC-776
U102 12-BIT VOLTAGE OUTPUT DAC IC-1130
U103 IC, +5V VOLTAGE REGULATOR,

LM2940CT
U104,U115 HIGH SPEED PWM CONTROLLER IC-1119
U106 IC, 8-CHAN ANA MULTIPLEXER,

DG408DY
U107 LOW NOISE OPAMP IC-1127
U108 IC, 8 STAGE SHIFT/STORE, MC14094BD IC-772
U109 HIGH PRECISION 10V REFERENCE IC-1121
U110A IC, DUAL SER INPUT VLTG OUTPUT,

12BITMDAC
U111 IC, OP-AMP, AD705JR IC-814
U113 IC, +5V RS-232 TRANSCEIVER, MAX202 IC-952
U114,U149 IC, VOLT COMPARATOR LM393D IC-775

RT-8

IC-576

IC-844

IC-973

4-18 Replaceable Parts

Table 4-5 (continued)

Model 2303B digital board lists

Circuit designation Description Keithley part no.

U116 IC, OPTOCOUPLER, 2601 IC-239
U117 IC, QUAD D FLIP FLOP W/CLK, RESET

IC-923

74HC175

U118 IC, NCHAN LAT DMOS QUADFET,

IC-893

SD5400CY
U119,U125 IC, QUAD 2 IN NOR, 74HCT02 IC-809
U120 IC, QUAD 2-INPUT NAND, 74HC00M IC-781
U121 SILICON-GATE CMOS IC-1123
U122,U142,U133 IC, DUAL HIGH CMR/SPEED OPTO,

IC-588

HCPL-2631
U123 PROGRAMMED ROM 2303-803A**
U124 LARGE SCALE IC LSI-162-70
U127 IC, MOT MC68331CPV16 LSI-188
U129 INTEGRATED CIRCUIT, OPA177GS IC-960
U130 DUAL DECADE RIPPLE COUNTER IC-1131
U131 IC, OCTAL INTERFACE BUS, 75160 IC-646
U132 IC, DUAL BIPOLAR OP-AMP, LT1124CS8 IC-955
U134 PRECISION BIFET OPAMP IC-1194
U135 IC, OP-AMP, NE5534D IC-802
U136 PROGRAMMED ROM 2000-802**
U137 IC, GPIB ADAPTER, 9914A LSI-123
U138 QUAD SPST ANALOG SWITCH IC-1211
U140,U148,U139 IC, POS NAND GATES/INVERT, 74HCT14 IC-656
U141 IC, OCTAL INTER BUS TRANS, 75161 IC-647
U145 IC, SERIAL EPROM 24LC16B LSI-153
U147 IC, DUAL D-TYPE F/F, 74HC74 IC-773
U154 CMOS AN ALOG SWITCH IC-1210
VR100,VR102 DIODE, ZENER, 6.2V MMSZ6V2 DZ-97
VR101 DIODE, ZENER 6.44V, IN4577AGED DZ-58
Y100 OSCILLATOR HIGH SPEED CMOS

CR-37

12MHZ
Y101 CRYSTAL, FSM327 CR-41

** Order present firmware revision level.

Replaceable Parts 4-19

Table 4-6

Model 2303B analog board parts list

Circuit designation Description Keithley part no.

C301,308,310,312,313,320,325,329,333,337 CAP, .1UF, 10%, 25V, CERAMIC C-495-.1
C302,C489,C506 CAP, 1UF, 20%, 50V, TANTALUM C-431-1
C303,C309 CAP, 7.5P, 10%, 100V, CERAMIC C-452-7.5P
C304,488,307,315,317,321,328,338,339,346 CAP, .1UF, 20%, 50V, CERAMIC C-418-.1
C314,335,336,371,372,377,378 CAP, 47UF, 20%, 100V, ALUM ELEC C-521-47
C319,C498,C306,C330 CAP, 4.7PF, 5%, 50V, MONO-CERAMIC C-452-4.7P
C322,331,359-361,374,343,434,508 CAP, 22UF, 20%, 25V, TANTALUM C-440-22
C323,C416,C422 CAP, 22U, 20%, 25V, TANTALUM C-535-22
C326,C404,C487 CAP, 1UF, 20%, 35V, TANTALUM C-494-1
C334 CAP, 100UF, 20%, 25V, ALUM ELEC C-413-100
C347,C478 CAP, 470U, 20%, 25V, ALUM ELEC C-478-470
C348,351,366,417,486 CAP, .1UF, 10%, 25V, CERAMIC C-495-.1
C352,354,355,358,373,379,382,384,515-519 CAP, .1UF, 20%, 50V, CERAMIC C-418-.1
C353,C357,C367 CAP, 1000P, 10%, 100V, CERAMIC C-451-1000P
C356,C499,C500 CAP, 100PF, 5%, 100V, CERAMIC C-465-100P
C362,C509 CAP, 220PF, 10%, 100V, CERAMIC C-451-220P
C363,C480,C481 CAP, 3300P, 10%, 500V, CERAMIC C-497-3300P
C365 CAP, 2200P, 1%, 50V, CERAMIC C-532-2200P
C368,C369 CAP, 100UF, 20%, 16V, TANTALUM C-504-100
C370,C305 CAP, 2.2U, 10%, 50V, TANTALUM C-563-2.2
C376 CAP, .022UF, 10%, 50V, CERAMIC C-491-.022
C390,407,414,415,423,424,494,495,435-437 CAP, .1UF, 20%, 50V, CERAMIC C-418-.1
C392,C393,C350,C491 CAP, .01, 5%, 50V, NPO C-514-.01
C394,C396 CAP, 1500P, 20%, 700V C-560-1500P
C395 CAP, 10U, 20%, 35V, ALUMINUM C-562-10
C402,C397 CAP, 47PF, 10%, 100V, CERAMIC C-451-47P
C405,C421 CAP, .033U, 10%, 50V, CERAMIC C-491-.033
C406,C410 CAPACITOR C-570-470
C426-429,344,345,479,482,483 CAPACITOR C-568-2200P
C438-C477,C505 CAP, 1U, 10%, 50V, CERAMIC C-564-1
C490 CAP, 100P, 10%, 100V, CERAMIC C-451-100P
C492,C493 CAP, 390P, 10%, 100V, CERAMIC C-451-390P
C497,C514 CAP, 150PF, 5%, 100V, CERAMIC C-465-150P
C501,502,503,419,504,507,510,511,420 CAP, .1UF, 20%, 50V, CERAMIC C-418-.1
C512,C513,C380,C385,C318,C364 CAP, .1UF, 20%, 50V, CERAMIC C-418-.1
CR302,CR322,CR330,CR332,CR318 DIODE, SWITCHING, MMSD914T19 RF-112

4-20 Replaceable Parts

Table 4-6 (continued)

Model 2303B analog board parts list

Circuit designation Description Keithley part no.

CR303-306,308,309,311,312,319,327-329 DIODE, MBRS140T3 RF-110
CR307,CR310 SCHOTTKY BARRIER DIODE RF-108
CR313 ULTRA FAST BRIDGE RECTIFIER RF-123
CR314 DIODE, BRIDGE PE05 RF-48
CR315 DIODE, SILICON, 53A4 RF-47
CR323,CR324,CR325,CR326 SCHOTTKY DIODE RF-121
CR331 DIODE, BARRIER, MBR745 RF-65
J1007 CONN, HEADER STRAIGHT SOLDER

PIN
J1009 CONN, HEADER STRAIGHT SOLDER

PIN
J1010 CONN, MALE, 5-PIN (MOLEX 42491) CS-784-5
J1011 CONNECTOR, MODULES CS-834
L301,L302,L304,L305,L306 CHOKE, EMI CH-57
L303,L311 LINE FILTER CH-85-10
L308,L309 INDUCTOR CH-89-1
L310 CHOKE CH-66-100
Q301 TRANS, CURRENT REGULATOR TG-341
Q304 TRANS, N CHANNEL FET, 2N4392 TG-128-1
Q305,Q306,Q307,Q308 TRANS, N CHANNEL JFET, SNJ132199 TG-294
Q310,Q311 TRANS, N CHANNEL FET, IRF530 TG-184
Q312 TRANS, NPN, MMBT3904 TG-238
Q313,315,314,332 HEXFET POWER MOSFET TG-354
Q323-326 RECTIFIER TG-337
Q327 TRANS, N-MOSFET, VN0605T TG-243
Q333 P CHANNEL MOSFET TG-363
Q334,Q335,Q330,Q331 HEXFET POWER MOSFET TG-358
Q338,Q341 PNP SILICON TRANSISTOR TG-310
Q339,Q340 NPN SILICON TRANSISTOR TG-309
Q342 TRANS, PNP, MMBT3906L TG-244
Q343 TRANS, N-CHAN JFET, SST4393 TG-263
R301,R302,R334,R336,R351 RES, 10K, .1%, .125W, THIN FILM R-456-10K
R304 RES, 24.9K, 1%, 100MW, THICK FILM R-418-24.9K
R306,R308,R313,R442,R490,R438 RES, 4.99K, 1%, 100MW THICK FILM R-418-4.99K
R307 THICK FILM TF-262
R315,372,314,492,415,441,458-460 RES, 10K, 1%, 100MW, THICK FILM R-418-10K
R320,R444 RES, 100K, 1%, 100MW, THICK FILM R-418-100K

CS-368-26

CS-368-16

Replaceable Parts 4-21

Table 4-6 (continued)

Model 2303B analog board parts list

Circuit designation Description Keithley part no.

R321,R503 RES, 1M, 1%, 100MW, THICK FILM R-418-1M
R322,R489 RES, 8.06K, 1%, .1W, THICK FILM R-418-8.06K
R325 RES, 10, 10%, 100MW, THICK FILM R-418-10
R326 RES, 14K, 1%, 125MW, METAL FILM R-391-14K
R329-332,357,358,360,361,378,379,390,391 RES, 10K, 5%, 250MW, METAL FILM R-376-10K
R333,R335,R349,R355 RES, 20K, 5%, 250MW, METAL FILM R-376-20K
R337,R343,R344,R456,R457,R476,R477, 23

R499
R340,R341 RES,1K, 5% 250MW, METAL FILM R-376-1K
R342 RES, 24.3, 1%, 100MW, THICK FILM R-418-24.3
R345,R346,R347,R348 RES, 560, 5%, 250MW, METAL FILM R-376-560
R350,368,426-428,435,328,339 RES, 10,5%, 125MW, METAL FILM R-375-10
R352,R478,R491 RES, 20K, 1%, 100MW THICK FILM R-418-20K
R353,354,461,473,495,496 RES, 475, 1%, 100MW, THICK FILM R-418-475
R363,R370 RES, 8,98K, .1%, .125W, THIN FILM R-456-8.98K
R364,R369 RES, 1K, .1%, .125W, THIN FILM R-456-1K
R373,R374,R387,R392 RES, 20K,1%,125MW, METAL FILM R-391-20K
R375,R377 RES, 1K, 5%, 1W 200V THICK FILM R-437-1K
R376 RES, 100, .1%, 1/2W, METAL FILM R-169-100
R383,R385,R386,R388 RES, 49.9K, 1%, 125MW, METAL FILM R-391-2.87K
R384 RES, 4.02K, 1%, 100MW, THICK FILM R-418-4.02K
R393,R394 RES, .02, 1.5W, 1% R-468-.02
R397 RES, 357, 1%, 100MW, THICK FILM R-418-357
R399,R400,R488 RES, .0499, 1%, 100MW, THICK FILM R-418-.0499
R401 RES, 301, 1%, 100MW, THICK FILM R-418-301
R411,413,417,419,474,483 RES, 100, 1%, 100MW, THICK FILM R-418-100
R421,R422,R480 RES, 200K, 1%, 125MW, METAL FILM R-391-200K
R429,433,434,436,356,371 RES, 7.5, 5%, .5W, THICK FILM R-469-7.5
R432 RES, 3.01K, 1%, 100MW, THICK FILM R-418-3.01K
R455 RES, .1, 1%, 3W R-475-.1
R462-464,467,468 RES, 10K, 1%, 100MW, THICK FILM R-418-10K
R465,R494 RES, 11K, 1%, 100MW, THICK FILM R-418-11K
R469 RES, 49.9K, 1%, 100MW, THICK FILM R-418-49.9K
R470,R497 RES, .2, 1%, 30W R-463-.2
R471 RES, .1, 1%, 30W R-463-.1
R475,R484 RES, 47.5, 1%, 100MW, THICK FILM R-418-47.5

RES, 1K, 1%, 100MW, THICK FILM R-418-1K

4-22 Replaceable Parts

Table 4-6 (continued)

Model 2303B analog board parts list

Circuit designation Description Keithley part no.

R479 RES, 20K, .1%, .125W, THIN FILM R-456-20K
R481,R482 RES, 4.99K, .1%, .125W, THIN FILM R-456-4.99K
R493 RES, 45.3K, 1%, 100MW, THICK FILM R-418-45.3K
R498 RES, .2, 1%, 1W (2512) R-441-.2
R500,R501,R502,R507 RES, 18,5%, 1W 200V, THICK FILM R-437-18
T301 TRANSFORMER TR-314A
TP301-310,311,314,316-318 CONNECTOR CS-985
U301,U321 DUAL FET OPAMP IC-1128
U302,U304,U308,U316,U335 PRECISION BIFET OPAMP IC-1194
U303 IC, QUAD 2 IN AND, 74HCT08 IC-837
U305,U307 IC, VOLTAGE REGULATOR, LM340-12 IC-60
U306,U311,U322,U330 IC, VOLT COMPARATOR LM393D IC-775
U310 MICR OPO WER V OL TAGE REGULA TOR IC-1152
U312 LOW POWER INSTRUMENT AMP IC-1124
U313 IC, NEG VOLTAGE REG -15V, 500MA,

79M15
U314 HIGH SPEED PWN CONTROLLER IC-1120
U315 IC, +5V VOLTAGE REGULATOR,

LM2940CT
U317 DUAL ±15V ZERO DRIFT OPAMP IC-1126
U320 IC, POS VOLTAGE REG +15V, 500MA,

78M15
U324 IC, CMOS ANAL SWITCH, DG444DY, IC-866
U327 80V 2.5A FULL BRIDGE FET DRIVER IC-1139
U329 IC, VOLT. COMPARATOR, LM311M IC-776
U333 POWER OUTPUT STAGE AUTOMATIC

BIAS
U334,U336 IC, DUAL OP-AMP, LF353M IC-842
VR303,VR310 DIODE, ZENER, 6.8V, MMSZ5235BT1 DZ-100
VR305,VR312 DIODE, ZENER, MM524694 TI DZ-113
VR306,VR307 DIODE, ZENER, 6.0V, BZX84B6V2 DZ-87
VR311 DIODE, ZENER DZ-121

IC-195

IC-576

IC-194

IC-1159

Table 4-7

Model 2303B mechanical parts list

Replaceable Parts 4-23

Qty. Description

1 BEZEL, REAR 428-303D
1 COVER 2000-307C
1 FAN FN-34-1
2 FOOT 428-319A
2 FOOT, EXTRUDED FE-22A
2 FOOT, RUBBER FE-6
1 FUSE, 2A, 250V, TIME LAG (5X20MM) F100 FU-81
1 HANDLE 428-329F
1 LINE CORD CO-7
1 LINE FILTER LF-11
1 MOUNTING EAR, LEFT 428-338B
1 MOUNTING EAR, RIGHT 428-328E
1 POWER ROD 704-313A

Keithley
part no.

A

Specifications

A-2 Specifications

Specifications

The following pages contain the condensed specifications for the 2303. Every effort has
been made to make these specifications complete by characterizing its performance under the
variety of conditions often encountered in production, engineering, and research.

Absolute accuracy

All DC specifications are given as relative accuracies. To obtain absolute accuracies, the
absolute uncertainties of the calibration sources must be added to the relative accuracies. The
absolute uncertainties for the calibration sources used during Keithley’s factory calibration are
included in the specifications. The uncertainties of the operator’s sources may be different.

All AC specifications are given as absolute accuracies.

Typical accuracies

Accuracy can be specified as typical or warranted. All specifications shown are warranted
unless specifically noted. Almost 99% of the 2303’s specifications are warranted specifications.
In some cases it is not possible to obtain sources to maintain traceability on the performance of
every unit in production on some measurements (e.g., high-voltage, high-frequency signal
sources with sufficient accuracy do not exist). These values are listed as typical.

DC VOLTAGE OUTPUT (2 YEARS, 23°C ± 5°C)

OUTPUT VOLTAGE: 0 to +15VDC.

OUTPUT ACCURACY: ±(0.05% + 10mV).

PROGRAMMING RESOLUTION: 5mV.

READBACK ACCURACY

1

: ±(0.05% + 3mV).

READBACK RESOLUTION: 1mV.

OUTPUT VOLTAGE SETTLING TIME: 5ms to within stated accuracy.

LOAD REGULATION: 0.01% + 2mV.

LINE REGULATION: 0.5mV.

STABILITY

2

: 0.01% + 0.5mV.

TRANSIENT RESPONSE TO 1000% LOAD CHANGE:

Transient Recovery Time

3,4

: <40µs to within 100mV of previous level.

<80µs to within 20mV of previous level.

Transient Voltage Drop: <100mV, typical.

3

<200mV, typical.

4

RIPPLE AND NOISE (20Hz to 20MHz): 3mV rms/8mV p-p, typical.

REMOTE SENSE: Automatic, 1V max. drop in each lead. Add 2mV to the voltage load regulation specification for each 1V change in the negative

output lead due to load current change.

DC CURRENT (2 YEARS, 23°C ± 5°C)

OUTPUT CURRENT: 0–9V: 5A max. >9V–15V: 3A max. (not intended to be operated in parallel).

SOURCE COMPLIANCE ACCURACY: ±(0.16% + 5mA)

5

.

PROGRAMMED SOURCE COMPLIANCE RESOLUTION: 1.25mA.

READBACK ACCURACY

1

: 5A range: ±(0.2% + 400µA).

5mA range: ±(0.2% + 1µA).

READBACK RESOLUTION: 5A range: 100µA.

5mA range: 0.1µA.

CURRENT SINK CAPACITY: 0–5V: 2A max. 5V–15V: Derate 0.1A per volt above 5V.

LOAD REGULATION: 0.01% + 1mA.

LINE REGULATION: 0.5mA.

STABILITY

4

: 0.01% + 50µA.

DIGITAL VOLTMETER INPUT (2 YEARS, 23°C ± 5°C)

INPUT VOLTAGE RANGE: 0 to +20VDC.

INPUT IMPEDANCE: 10

10

Ω typical.

MAXIMUM VOLTAGE (either input terminal) WITH RESPECT TO OUTPUT LOW: –3V, +22V.

READING ACCURACY

1

: ±(0.05% + 3mV).

READING RESOLUTION: 1mV.

DC GENERAL

MEASUREMENT TIME CHOICES: 0.01 to 10 PLC7, in 0.01PLC steps.

AVERAGE READINGS: 1 to 10.

READING TIME

1, 8,9

: 31ms, typical.

Specifications A-3

PULSE CURRENT MEASUREMENT OPERATION

TRIGGER LEVEL: 5mA to 5A, in 5mA steps.

TRIGGER DELAY: 0 to 100ms, in 10µs steps.

INTERNAL TRIGGER DELAY: 25µs.

HIGH/LOW/AVERAGE MODE:

Measurement Aperture Settings: 33.3µs to 833ms, in 33.3µs steps.

Average Readings: 1 to 100.

BURST MODE:

Measurement Aperture: 33.3µs.

Conversion Rate: 3600/second, typical.

Number of Samples: 1 to 5000.

Transfer Samples Across IEEE Bus in Binary Mode: 4800 bytes/second, typical.

LONG INTEGRATION MODE: Measurement Time

6

: 850ms (840ms) to 60 seconds in 16.7ms (20ms) steps.

GENERAL

ISOLATION (low - earth): 22VDC max.

PROGRAMMING: IEEE-488.2 (SCPI).

USER-DEFINABLE POWER-UP STATES: 5.

REAR PANEL CONNECTOR: 8-position quick disconnect terminal block for output (4), sense (2), and DVM (2).
TEMPERATURE COEFFICIENT (outside 23°C ±5°C): Derate accuracy specification by (0.1 ×specification)/°C.

OPERATING TEMPERATURE:

0° to 50°C (Derate to 70%).
0° to 35°C (Full power).

STORAGE TEMPERATURE: –20° to 70°C.

HUMIDITY: <80% @ 35°C non-condensing.

POWER CONSUMPTION: 150VA max.

REMOTE DISPLAY/KEYPAD OPTION: Disables standard front panel.
DIMENSIONS: 89mm high × 213mm wide × 360mm deep (3

1

⁄

2

in × 8

1

⁄

2

in × 14

3

⁄16in).

NET WEIGHT: 3.2kg (7.1 lbs).

SHIPPING WEIGHT: 5.4kg (12 lbs).

INPUT POWER: 100–120VAC/220-240VAC, 50 or 60Hz (auto detected at power-up).

WARRANTY: One year parts and labor on materials and workmanship.

EMC: Conforms with European Union Directive directive 89/336/EEC

EN 55011, EN 50082-1, EN 61000-3-2 and 61000-3-3, FCC part 15 class B.

SAFETY: Conforms with European Union Directive 73/23/EEC EN 61010-1,

UL 3111-1.

AC LINE LEAKAGE CURRENT: 450µA @ 110VAC, typ.; 600µA @ 220V, typ.

RELAY CONTROL JACK: 1-channel, sink 150mA max., 15V max. 5V output, 100mA max., also available on jack. Accepts 0.173 in Bantam-type

plug (CS-1003-1).

ACCESSORIES SUPPLIED: User manual, service manual, output connector mating terminal (part no. CS-846).

ACCESSORIES AVAILABLE:

Model 2304-DISP: Remote Display/Keypad (4.6 in ×2.7 in × 1.5 in). Includes 2.7m (9 ft) cable and rack mount kit.

Model 2303B: 2303 with blank front panel (only AC power indicator LED).

1

PLC = 1.00.

2

Following 15 minute warm-up, the change in output over 8 hours under ambient temperature, constant load, and line operating conditions.

3

Remote sense, at output terminals, 1000% load change; typical.

4

Remote sense, with 4.5m (15 ft) of 16 gauge wire and 1Ωresistance in each lead to simulate typical test environment, up to 1.5A load change.

5

Minimum current in constant current mode is 6mA.

6

60Hz (50Hz).

7

PLC = Power Line Cycle. 1PLC = 16.7ms for 60Hz operation, 20ms for 50Hz operation.

8

Display off.

9

Speed includes measurement and binary data transfer out of GPIB.

A-4 Specifications

×

µ

×

µ

×

A-6 Specifications

Accuracy calculations

The information below discusses how to calculate output, readback, and digital voltmeter

input accuracy.

Output and compliance accuracy

Output and compliance accuracy are calculated as follows:
Accuracy = ±(% of output + offset)

As an example of how to calculate the actual output limits, assume the Model 2303, 2303B,
or 2303-PJ is sourcing 10V. Compute the output range from output voltage accuracy specifica­tions as follows:

Accuracy = ±(% of output + offset)

= ±[(0.05%
= ±(5mV + 10mV)

= ±15mV
Thus, the actual output voltage range is: 10V± 15mV, or from 9.985V to 10.015V.
Current compliance calculations are performed in exactly the same manner using the perti-

nent specifications and compliance current settings.

10V) + 10mV]

Readback accuracy

Readback accuracy is calculated similarly, except of course that voltage or current readback

specifications are used. As an example of how to calculate the actual current readback limits,
assume the actual current being measured is 1.5A. Using the 5A range current readback speci­fications, the current readback reading range is:

Accuracy = ±(0.2% of reading + 400

= ±[(0.2%

= ±(3mA + 400

= ±3.4mA
In this case, the actual current readback reading range is: 1.5A ±3.2mA, or from 1.4968A to

1.5032A.

1.5A) + 200 µ A)]
A)

Digital voltmeter input accuracy

Accuracy of the digital voltmeter can be computed in e xactly the same manner. Use the digital
voltmeter input accuracy specifications and the applied voltage in your calculations. For exam­ple, assume that 5V is applied to the digital voltmeter input. Reading range is:

Accuracy = ±(% of reading + offset)

= ±[(0.05%
= ±(2.5mV + 10mV)
= ±12.5mV

The reading range is 5V ±12.5mV, or from 4.988V to 5.012V.

5V) + 10mV]

A offset)

A-7 Specifications

B

Calibration Reference

B-2 Calibration Reference

Introduction

Command summary

Table B-1

Remote calibration command summary

This appendix contains detailed information on the various Model 2303, 2303B, and
2303-PJ remote calibration commands, calibration error messages, and methods to detect the
end of each calibration step.

Section 2 of this manual covers detailed calibration procedures.

Table B-1 summarizes calibration commands. These commands are covered in detail in the
following paragraphs.

Command Description

:CALibration Calibration subsystem.

:PROTected Cal commands protected by password.

:CODE '<code>' Unlock cal; changes code if cal is already unlocked. (Default

code: KI002303.)
:COUNt? Query number of times 2303 has been calibrated.
:DATE <yyyy>,<mm>,<dd> Program calibration year, month, day.
:DATE? Query calibration year, month, day.
:INIT Initiate calibration (must be sent before other cal steps).
:SAVE Save calibration data to EEPROM.*
:LOCK Lock out calibration. (Abort if calibration is incomplete.)
:STEP0 <nrf> Output full-scale voltage (14V).
:STEP1 <nrf> Calibrate output voltage setting using external DMM reading.
:STEP2 <nrf> Calibrate voltage measuring using external DMM reading.
:STEP3 Perform DVM input full-scale (14V) cal.
:STEP4 <nrf> Output current (1.9A) for 5A full-scale cal.
:STEP5 <nrf> Calibrate output current limit using calculated current.
:STEP6 <nrf> Calibrate 5A measurement range using calculated current.
:STEP7 Output 5mA (500mA, Model 2303-PJ) nominal current for 5mA

(500mA) range full-scale cal.
:STEP8 <nrf> Calibrate 5mA (500mA, Model 2303-PJ) measurement range

using calculated current.

* Calibration data will not be saved if:

1. Calibration was not unlocked with :CODE command.

2. Invalid data exists. (For example, cal step failed or was aborted.)

3. Incomplete number of cal steps were performed.

4. Calibration was not per

formed in the proper sequence.

Miscellaneous commands

Miscellaneous commands are those commands that perform such functions as saving cali-

bration constants, locking out calibration, and programming date parameters.

:CODE

(:CALibration:PROT ected:CODE)

Calibration Reference B-3

Purpose
Format
Parameter
Description

Notes •

Example

To unlock calibration so that you can perform the calibration procedure.

:cal:prot:code '<code>'

Up to an 8-character ASCII string, including letters and numbers.
The :CODE command sends the calibration code and enables calibration

when performing these procedures via remote. The correct code must be sent
to the unit before sending any other calibration command. The default remote
code is KI002303.

The :CODE command should be sent only once before performing cali-

bration. Do not send :CODE before each calibration step.

•

To change the code, first send the present code, then send the new code.

•

The code parameter must be enclosed in single quotes.

:CAL:PROT:CODE 'KI002303' Send default code of KI002303.

:COUNT?

(:CALibration:PROT ected:COUNt?)

Purpose
Format
Response

To request the number of times the Model 2303 has been calibrated.

:cal:prot:count?

Number of times calibrated.

Description

Example

The :COUNT? query may be used to determine the total number of times the
Model 2303 has been calibrated. The calibration count will also be displayed
during the front panel calibration procedure.

:CAL:PROT:COUNT?

:DA TE

(:CALibration:PROT ected:DA TE)

Purpose
Format

To program the calibration date.

:cal:prot:date <yyyy>, <mm>, <dd>

Request calibration count.

B-4 Calibration Reference

Parameters

Query
Response
Description

Note
Example

<yyyy> = 1998 to 2097
<mm> = 1 to 12
<dd> = 1 to 31

:cal:prot:date?

<yyyy> , <mm> , <dd>
The :DATE command allows you to store the calibration date in instrument

EEROM for future reference. Y ou can read back the date from the instrument
by using the :DATE? query. The calibration date will also be displayed dur­ing the front panel calibration procedure.

The year, month, and day parameters must be delimited by commas.

:CAL:PROT:DATE 1998,11,20

:INIT

(:CALibration:PROT ected:INIT)

Purpose
Format
Description

Note

To initiate calibration.

:cal:prot:init

The :INIT command initiates the calibration process and must be sent before
all other commands except :CODE.

The :INIT command should be sent only once at the beginning of the calibra­tion procedure. Do not send :INIT before each calibration step.

Send cal date (11/20/98).

Example

:CAL:PROT:INIT

:SA VE

(:CALibration:PROT ected:SA VE)

Purpose
Format
Description

Note

To save calibration constants in EEROM after the calibration procedure.

:cal:prot:save

The :SAVE command stores internally calculated calibration constants
derived during comprehensi ve in EER OM. EER OM is non-volatile memory,
and calibration constants will be retained indefinitely once saved. :SAVE is
sent after all other calibration steps.

Calibration will be only temporary unless the :SAVE command is sent to per­manently store calibration constants. Calibration data will not be saved if:

1. Calibration was not unlocked by sending the :CODE command

2. Invalid data exists (for example, cal step failed.)

3. An incomplete number cal steps were performed.

4. Calibration was performed out of sequence.

Initiate calibration.

Calibration Reference B-5

Example

:CAL:PROT:SAVE

Save calibration constants

:STEP

(:CALibration:PROT ected:STEP<n>)

Purpose
Format
Parameters
Description

Note

Example

Table B-2

Calibration step summary

Command Description

:CALibration Calibration subsystem.

:PROTected Cal commands protected by password.

To perform various calibration steps.

:cal:prot:step<n>

See T able B-2.
The :CAL:PROT:STEP<n> command performs calibration at the various

points listed in Table B-2. See
connections.

Calibration steps must be performed in the order listed in Table B-2, or an
error will occur.

:CAL:PROT:STEP0 14

Section 2 for details on test equipment and

Perform cal step 0 (full-scale output).

:STEP0 <nrf> Output full-scale voltage (14V).
:STEP1 <nrf> Calibrate output voltage setting using external DMM

reading.

:STEP2 <nrf> Calibrate voltage measuring using external DMM reading.
:STEP3 Perform DVM input full-scale (14V) cal.
:STEP4 <nrf> Output current (1.9A) for 5A full-scale cal.
:STEP5 <nrf> Calibrate output current limit using calculated current.
:STEP6 <nrf> Calibrate 5A measurement range using calculated current.
:STEP7 Output 5mA (500mA, Model 2303-PJ) nominal current.
:STEP8 <nrf> Calibrate 5mA (500mA, Model 2303-PJ) measurement

range using calculated current.

B-6 Calibration Reference

Detecting calibration errors

If an error occurs during any calibration step, the Model 2303 will generate an appropriate

error message. Several methods to detect calibration errors are discussed below.

Reading the error queue

As with other Model 2303 errors, any calibration errors will be reported in the error queue.

Use the :SYST:ERR? query to read the error queue.

Error summary

Table B-3 summarizes calibration errors.

Table B-3

Calibration errors

Error number Error message

+400 Voltage zero cal prepare error
+401 Voltage zero cal output error
+402 Voltage zero cal measure error
+403 DVM zero cal error
+404 Volt full scale cal prepare error
+405 Volt full scale cal output error
+406 Volt full scale cal meas error
+407 DVM full scale cal meas error
+408 Open circuit cal error
+409 5A source cal prepare error
+410 5A source cal output error
+411 5A source cal measure error
+412 5mA source cal prepare error*
+413 5mA source cal measure error*

*500mA with Model 2303-PJ.

Status byte EA V (Error A vailable) bit

Whenever an error is available in the error queue, the EAV (Error Available) bit (bit 2) of the
status byte will be set. Use the *STB? query to obtain the status byte, then test bit 2 to see if it
is set. If the EAV bit is set, an error has occurred, and you can use the appropriate error query to
read the error and at the same time clear the EAV bit in the status byte.

Generating an SRQ on error

To program the instrument to generate an IEEE-488 bus SRQ (Service Request) when an
error occurs, send the following command: *SRE 4. This command will enable SRQ when the
EAV bit is set. You can then read the status byte and error queue as outlined above to check for
errors and to determine the exact nature of the error.

Detecting calibration step completion

When sending remote calibration commands, you must wait until the instrument completes
the current operation before sending another command. You can use either *OPC or *OPC? to
determine when each calibration step is completed.

Calibration Reference B-7

Using the *OPC command

Using *OPC is the preferred method to detect the end of each calibration step. To use *OPC,
do the following:

1. Enable operation complete by sending *ESE 1. This command sets the OPC (operation
complete bit) in the standard event enable register, allowing operation complete status
from the standard event status register to set the ESB (event summary bit) in the status
byte when operation complete is detected.

2. Send the *OPC command immediately following each calibration command. For
example:

:CAL:PROT:STEP0 14;*OPC

Note that you must include the semicolon (;) to separate the two commands, and that
the *OPC command must appear on the same line as the command.

3. After sending a calibration command, repeatedly test the ESB (Event Summary) bit (bit

5) in the status byte until it is set. (Use *STB? to request the status byte.)

4. Once operation complete has been detected, clear OPC status using one of two methods:
(1) use the *ESR? query , then read the response to clear the standard event status re gister,
or (2) send the *CLS command to clear the status registers. Note that sending *CLS will
also clear the error queue and operation complete status.

Using the *OPC? query

With the *OPC? (operation complete) query, the instrument will place an ASCII 1 in the out­put queue when it has completed each step. To determine when the OPC response is ready, do
the following:

1. Repeatedly test the MAV (Message A v ailable) bit (bit 4) in the status byte and w ait until
it is set. (You can request the status byte by using the *STB? query.)

2. When MA V is set, a message is a vailable in the output queue, and you can read the output
queue and test for an ASCII 1.

3. After reading the output queue, repeatedly test MAV again until it clears. At this point,
the calibration step is completed.

B-8 Calibration Reference

Generating an SRQ on calibration complete

An IEEE-488 bus SRQ (service request) can be used to detect operation complete instead of
repeatedly polling the Model 2303. To use this method, send both *ESE 1 and *SRE 32 to the
instrument, then include the *OPC command at the end of each calibration command line, as
covered above. Clear the SRQ by querying the ESR (using the *ESR? query) to clear OPC sta­tus, then request the status byte with the *STB? query to clear the SRQ.

Refer to your controller's documentation for information on detecting and servicing SRQs.

C

Calibration Programs

Ω

Ω

Ω

C-2 Calibration Programs

Introduction

This appendix includes calibration programs written in BASIC to help you in calibrating the
Models 2303/2303B or Model 2303-PJ. Refer to
equipment, and connections.

Appendix B covers calibration commands in detail.

Computer hardware requirements

The following computer hardware is required to run the calibration programs:

• IBM PC compatible computer.

• Keithley KPC-488.2 or KPC-488.2AT, or CEC PC-488 IEEE-488 interface for the
computer.

• Two shielded IEEE-488 bus cables (Keithley Model 7007)

Section 2 for more details on calibration procedures,

Software requirements

T o use the calibration program, you will need the following computer software:

• Microsoft QBasic (supplied with MS-DOS 5.0 or later).

• MS-DOS version 5.0 or later.

• HP-style Universal Language Driv er, CECHP.EXE (supplied with Keithley and CEC
interface cards listed above).

Calibration equipment

The following calibration equipment is required:

• Keithley Model 2001 Digital Multimeter

•4

, 0.1%, 100W resistor

•3k

, 0.1%, 0.25W resistor (Models 2303 and 2303B only)

•30

, 0.1%, 10W resistor (Model 2303-PJ only)

See

Section 2 for detailed equipment specifications as well as details on test connections.

General program instructions

1. With the power of f, connect the Model 2303 and the digital multimeter to the IEEE-488
interface of the computer . Be sure to use shielded IEEE-488 cables for bus connections.

2. Turn on the computer , the Model 2303, and the digital multimeter . Allow the Model 2303
and the multimeter to warm up for at least one hour before performing calibration.

3. Make sure the Model 2303 is set for a primary address of 16.

4. Make sure the digital multimeter primary address is set to 17.

5. Make sure that the computer bus driver software (CECHP.EXE) is properly initialized.

6. Enter the QBasic editor, and type in the program below . Be sure to use the actual charac­terized resistor values when entering the parameters.

7. Check thoroughly for errors, then save the program using a convenient filename.

8. Run the program, and follow the prompts on the screen to perform calibration. F or test
connections, refer to the following figures in Section 2:

• Voltage connections: Figure 2-2.

• 5A current connections: Figure 2-3.

• 5mA current connections (Models 2303 and 2303B): Figure 2-4.

• 500mA current connections (Model 2303-PJ): Figure 2-5.

Calibration Programs C-3

C-4 Calibration Programs

Program C-1

Model 2303/2303B calibration program

' Model 2303/2303B calibration program using Keithley Model 2001 DMM.
' Rev. 1.1, 1/15/98
' 2303 primary address = 16. 2001 primary address = 17.
OPEN "IEEE" FOR OUTPUT AS #1 ' Open IEEE-488 output path.
OPEN "IEEE" FOR INPUT AS #2 ' Open IEEE-488 input path.
PRINT #1, "INTERM CRLF" ' Set input terminator.
PRINT #1, "OUTTERM LF" ' Set output terminator.
PRINT #1, "REMOTE 16 17" ' Put 2303, 2001 in remote.
PRINT #1, "OUTPUT 16;*CLS" ' Initialize 2303.
PRINT #1, "OUTPUT 16;*ESE 1;*SRE 32" ' Enable OPC and SRQ.
PRINT #1, "OUTPUT 17;:SYST:PRES" ' Initialize 2001.
PRINT #1, "OUTPUT 17;:FORM:ELEM READ" ' Reading only.
C$ = ":CAL:PROT:STEP" ' Partial command header.
FourOhm = 4 ' Use characterized 4 ohm value.
ThreeK = 3000 ' Use characterized 3 k ohm value.
CLS
PRINT "Model 2303/2303B Calibration Program"
PRINT #1, "OUTPUT 16;:CAL:PROT:CODE 'KI002303'"'Unlock calibration.
PRINT #1, "OUTPUT 16;:CAL:PROT:INIT" ' Initiate calibration.
GOSUB ErrCheck
GOSUB KeyCheck
FOR I = 0 TO 8 ' Loop for all cal steps.
IF I = 0 OR I = 4 OR I = 7 THEN ' Prompt for test connections.
READ Msg$
PRINT Msg$
GOSUB KeyCheck
END IF
I$ = STR$(I): C1$ = C$ + RIGHT$(I$, LEN(I$) - 1)
SELECT CASE I ' Build command string.
CASE 0
Cmd$ = C1$ + " 14"
CASE 1, 2, 5, 6, 8
GOSUB ReadDMM
Cmd$ = C1$ + " " + Reading$
CASE 3, 7
Cmd$ = C1$
CASE 4
Cmd$ = C1$ + " 1.9"
END SELECT
PRINT #1, "OUTPUT 16;"; Cmd$; ";*OPC" ' Send command string to 2303.
GOSUB ErrCheck
GOSUB CalEnd
NEXT I
LINE INPUT "Enter calibration date (yyyy,mm,dd): "; D$
PRINT #1, "OUTPUT 16;:CAL:PROT:DATE "; D$
PRINT #1, "OUTPUT 16;:CAL:PROT:SAVE" ' Save calibration constants.
PRINT #1, "OUTPUT 16;:CAL:PROT:LOCK" ' Lock out calibration.

Calibration Programs C-5

GOSUB ErrCheck
PRINT "Calibration completed."
PRINT #1, "LOCAL 16 17"
CLOSE
END
'
KeyCheck: ' Check for key press routine.
WHILE INKEY$ <> "": WEND ' Flush keyboard buffer.
PRINT : PRINT "Press any key to continue (ESC to abort program)."
DO: I$ = INKEY$: LOOP WHILE I$ = ""
IF I$ = CHR$(27) THEN GOTO EndProg ' Abort if ESC is pressed.
RETURN
'
CalEnd: ' Check for cal step completion.
DO: PRINT #1, "SRQ?" ' Request SRQ status.
INPUT #2, S ' Input SRQ status byte.
LOOP UNTIL S ' Wait for operation complete.
PRINT #1, "OUTPUT 16;*ESR?" ' Clear OPC.
PRINT #1, "ENTER 16"
INPUT #2, S
PRINT #1, "SPOLL 16" ' Clear SRQ.
INPUT #2, S
RETURN
'
ErrCheck: ' Error check routine.
PRINT #1, "OUTPUT 16;:SYST:ERR?"
PRINT #1, "ENTER 16"
INPUT #2, E, Err$
IF E <> 0 THEN PRINT Err$: GOTO EndProg
RETURN
'
ReadDMM: ' Get reading from DMM.
SLEEP 5
PRINT #1, "OUTPUT 17;:FETCH?"
PRINT #1, "ENTER 17"
INPUT #2, Reading$
IF I = 5 OR I = 6 THEN Reading$ = STR$(VAL(Reading$) / FourOhm)
IF I = 8 THEN Reading$ = STR$(VAL(Reading$) / ThreeK)
RETURN
'
EndProg: ' Close files, end program.
BEEP: PRINT "Calibration aborted."
PRINT #1, "OUTPUT 16;:CAL:PROT:LOCK"
PRINT #1, "LOCAL 16 17"
CLOSE
END
Messages:
DATA "Connect DMM volts input to SOURCE and DVM IN terminals."
DATA "Connect DMM volts input and 4 ohm resistor to SOURCE and SENSE."
DATA "Connect DMM volts input and 3 k ohm resistor to SOURCE and SENSE."

C-6 Calibration Programs

Program C-2

Model 2303-PJ calibration program

' Model 2303-PJ calibration program using Keithley Model 2001 DMM.
' Rev. 1.0, 1/15/98
' 2303-PJ primary address = 16. 2001 primary address = 17.
OPEN "IEEE" FOR OUTPUT AS #1 ' Open IEEE-488 output path.
OPEN "IEEE" FOR INPUT AS #2 ' Open IEEE-488 input path.
PRINT #1, "INTERM CRLF" ' Set input terminator.
PRINT #1, "OUTTERM LF" ' Set output terminator.
PRINT #1, "REMOTE 16 17" ' Put 2303-PJ, 2001 in remote.
PRINT #1, "OUTPUT 16;*CLS" ' Initialize 2303-PJ.
PRINT #1, "OUTPUT 16;*ESE 1;*SRE 32" ' Enable OPC and SRQ.
PRINT #1, "OUTPUT 17;:SYST:PRES" ' Initialize 2001.
PRINT #1, "OUTPUT 17;:FORM:ELEM READ" ' Reading only.
C$ = ":CAL:PROT:STEP" ' Partial command header.
FourOhm = 4 ' Use characterized 4 ohm value.
ThirtyOhm = 30 ' Use characterized 30 ohm value.
CLS
PRINT "Model 2303-PJ Calibration Program"
PRINT #1, "OUTPUT 16;:CAL:PROT:CODE 'KI002303'"'Unlock calibration.
PRINT #1, "OUTPUT 16;:CAL:PROT:INIT" ' Initiate calibration.
GOSUB ErrCheck
GOSUB KeyCheck
FOR I = 0 TO 8 ' Loop for all cal steps.
IF I = 0 OR I = 4 OR I = 7 THEN ' Prompt for test connections.
READ Msg$
PRINT Msg$
GOSUB KeyCheck
END IF
I$ = STR$(I): C1$ = C$ + RIGHT$(I$, LEN(I$) - 1)
SELECT CASE I ' Build command string.
CASE 0
Cmd$ = C1$ + " 14"
CASE 1, 2, 5, 6, 8
GOSUB ReadDMM
Cmd$ = C1$ + " " + Reading$
CASE 3, 7
Cmd$ = C1$
CASE 4
Cmd$ = C1$ + " 1.9"
END SELECT
PRINT #1, "OUTPUT 16;"; Cmd$; ";*OPC" ' Send command string to 2303-PJ.
GOSUB ErrCheck
GOSUB CalEnd
NEXT I
LINE INPUT "Enter calibration date (yyyy,mm,dd): "; D$
PRINT #1, "OUTPUT 16;:CAL:PROT:DATE "; D$
PRINT #1, "OUTPUT 16;:CAL:PROT:SAVE" ' Save calibration constants.
PRINT #1, "OUTPUT 16;:CAL:PROT:LOCK" ' Lock out calibration.

Calibration Programs C-7

GOSUB ErrCheck
PRINT "Calibration completed."
PRINT #1, "LOCAL 16 17"
CLOSE
END
'
KeyCheck: ' Check for key press routine.
WHILE INKEY$ <> "": WEND ' Flush keyboard buffer.
PRINT : PRINT "Press any key to continue (ESC to abort program)."
DO: I$ = INKEY$: LOOP WHILE I$ = ""
IF I$ = CHR$(27) THEN GOTO EndProg ' Abort if ESC is pressed.
RETURN
'
CalEnd: ' Check for cal step completion.
DO: PRINT #1, "SRQ?" ' Request SRQ status.
INPUT #2, S ' Input SRQ status byte.
LOOP UNTIL S ' Wait for operation complete.
PRINT #1, "OUTPUT 16;*ESR?" ' Clear OPC.
PRINT #1, "ENTER 16"
INPUT #2, S
PRINT #1, "SPOLL 16" ' Clear SRQ.
INPUT #2, S
RETURN
'
ErrCheck: ' Error check routine.
PRINT #1, "OUTPUT 16;:SYST:ERR?"
PRINT #1, "ENTER 16"
INPUT #2, E, Err$
IF E <> 0 THEN PRINT Err$: GOTO EndProg
RETURN
'
ReadDMM: ' Get reading from DMM.
SLEEP 5
PRINT #1, "OUTPUT 17;:FETCH?"
PRINT #1, "ENTER 17"
INPUT #2, Reading$
IF I = 5 OR I = 6 THEN Reading$ = STR$(VAL(Reading$) / FourOhm)
IF I = 8 THEN Reading$ = STR$(VAL(Reading$) / ThirtyOhm)
RETURN
'
EndProg: ' Close files, end program.
BEEP: PRINT "Calibration aborted."
PRINT #1, "OUTPUT 16;:CAL:PROT:LOCK"
PRINT #1, "LOCAL 16 17"
CLOSE
END
Messages:
DATA "Connect DMM volts input to SOURCE and DVM IN terminals."
DATA "Connect DMM volts input and 4 ohm resistor to SOURCE and SENSE."
DATA "Connect DMM volts input and 30 ohm resistor to SOURCE and SENSE."

D

Instrument Control

D-2 Instrument Control

Introduction

This appendix contains basic information on controlling the Model 2303 and 2303-PJ from the
front panel, or programming the Model 2303, 2303B, or 2303-PJ over the b us. Refer to the user’s
manual for more detailed information.

Front panel control

Setting output values

Use the following general procedure to set Model 2303 or 2303-PJ output v alues:

1. Using the DISPLAY key, make sure the unit is in the ACTUAL V AND I display mode.

2. Press SET . The LSD (least-significant digit) in the voltage display area will blink, indi­cating that the unit is in the output setting mode.

3. Use the edit (arrow) keys to adjust the voltage value, then press SET. The LSD for the
current value will then blink.

4. Use the edit keys to adjust the current value, and press SET. The display will then return
to the readback mode (no blinking digits).

Setting the display mode

Press the DISPLAY key, then use the up or down arrow key to select the display mode. Use the
ACTU AL V AND I mode when testing current and v oltage, and select the D VM INPUT mode when
testing the DVM input.

Selecting the current range

T o select the 5mA (500mA, Model 2303-PJ) or 5A current readback range:

1. Press the MENU key.

2. Use the up or down arrow key to select the CURRENT RANGE menu item, then press
ENTER.

3. Use the edit keys to select the desired current range, then press ENTER.

4. Press the MENU key to back out of the menu structure.

T urning on the output

T o turn on the output, simply press the OPERATE key. Press OPERATE again to turn the output

off.

IEEE-488 bus control

T able D-1 summarizes commands necessary to control the Models 2303, 2303B, and 2303-PJ for

tests in this manual.

Table D-1

Basic remote commands

Command Description

:SOUR:VOLT <voltage> Set output voltage (0-15).
:SOUR:CURR:LIM <current> Set current limit (0-5).
:SENS:FUNC “VOLT” Voltage readback mode.
:SENS:FUNC “CURR” Current readback mode.
:SENS:FUNC “DVM” DVM measurements.
:SENS:CURR:RANG MAX 5A current readback range.
:SENS:CURR:RANG MIN 5mA current readback range.*
:OUTP ON Turn on output.
:OUTP OFF Turn off output.
:READ? Trigger and request reading.

Instrument Control D-3

*500mA for the Model 2303-PJ.

Setting output values

Use the :SOUR:VOLT or :SOUR:CURR:LIM commands to set the output voltage and current
limit respectively. For example, the following commands set the output voltage to 10V and the cur­rent limit to 3A:

:SOUR:VOLT 10

:SOUR:CURR:LIM 3

Setting the reading mode

Use :SENS:FUNC to program the reading mode. For example, select DVM input readings with
the following command:

:

SENS:FUNC “DVM”

D-4 Instrument Control

T urning on the output

Use OUTP ON and OUTP OFF to turn the output on and off respecti vely.

Requesting readings

T o trigger and request a reading, first send the :READ? query, then address the instrument to talk

in the usual manner. The type of readings sent will depend on the selected reading mode.

Basic control program

Use the program below to send commands to the unit. To request a reading, type in “:READ?” at
the command prompt, or type in “Q” to exit the program. See Appendix C for information on com­puter hardware and software requirements.

Program D-1

Basic control programming

' Program to send basic commands to 2303. Primary address =16.
OPEN "IEEE" FOR OUTPUT AS #1 ' Open IEEE-488 output path.
OPEN "IEEE" FOR INPUT AS #2 ' Open IEEE-488 input path.
PRINT #1, "INTERM CRLF" ' Set input terminator.
PRINT #1, "OUTTERM LF" ' Set output terminator.
PRINT #1, "REMOTE 16" ' Put 2303 in remote.
CLS
Start: PRINT "Command: "; ' Print command prompt.
LINE INPUT Cmd$ ' Input command string.
IF Cmd$ = "Q" THEN GOTO Quit ' Check for Q to quit.
PRINT #1, "OUTPUT 16;"; Cmd$ ' Send command to unit.
IF Cmd$ = ":READ?" THEN ' Check for :READ? query.
PRINT #1, "ENTER 16" ' Address to talk.
LINE INPUT #2, Reading$ ' Input reading string.
PRINT Reading$
END IF
GOTO Start
Quit: PRINT #1, "LOCAL 16" ' Got to local.
CLOSE
END