Tektronix 854x Quick Start Guide

Model 854x Laser Diode Mount

Quick Start Guide

A GREATER MEASURE OF CONFIDENCE

WARRANTY

Keithley Instruments, Inc. warrants this product to be free from defects in material and workmanship for a
period of 1 year from date of shipment.

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

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

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

LIMITATION OF WARRANTY

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

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

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

Keithley Instruments, Inc.

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

CHINA: Yuan Chen Xin Building, Room 705 • 12 Yumin Road, Dewai, Madian • Beijing 100029 • 8610-8225-1886 • Fax: [phone]
FINLAND: Tietäjäntie 2 • 02130 Espoo • Phone: [phone] • Fax: [phone]
FRANCE: 3, allée des Garays • 91127 Palaiseau Cédex • 01-64 53 20 20 • Fax: [phone]
GERMANY: Landsberger Strasse 65 • 82110 Germering • 089/84 93 07-40 • Fax: [phone]
GREAT BRITAIN: Unit 2 Commerce Park, Brunel Road • Theale • Berkshire RG7 4AB • 0118 929 7500 • Fax: [phone]
INDIA: 1/5 Eagles Street • Langford Town • Bangalore 560 025, INDIA • 080 212 8027 • Fax : [phone]
ITALY: Viale San Gimignano, 38 • 20146 Milano • 02-48 39 16 01 • Fax: [phone]
JAPAN: New Pier Takeshiba North Tower 13F • 11-1, Kaigan 1-chome • Minato-ku, Tokyo 105-0022 • 81-3-5733-7555 • Fax: [phone]
KOREA: 2FL., URI Building • 2-14 Yangjae-Dong • Seocho-Gu, Seoul 137-888 • 82-2-574-7778 • Fax: [phone]
NETHERLANDS: Postbus 559 • 4200 AN Gorinchem • 0183-635333 • Fax: [phone]
SWEDEN: c/o Regus Business Centre • Frosundaviks Allé 15, 4tr • 169 70 Solna • 08-509 04 679 • Fax: [phone]
TAIWAN: 13F-3. No. 6, Lane 99 Pu-Ding Road • Hsinchu, Taiwan, R.O.C. • 886-3-572-9077• Fax: [phone]

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

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

10/02

Model 854x Laser Diode Mount

Quick Start Guide

©2002, Keithley Instruments, Inc.

All rights reserved.

Cleveland, Ohio, U.S.A.

First Printing, September 2002

Document Number: 854x-903-01 Rev. A

Manual Print History

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

Revision A (Document Number 854x-903-01).............................................................August 2002

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

S

afety Precautions

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

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

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

The types of product users are:

Responsible body

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

Operators

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

Maintenance personnel

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

Service personnel

trained service personnel may perform installation and service procedures.

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

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

42.4V peak, or 60VDC are present.

circuit before measuring.

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

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

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

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

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

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

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

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

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

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

no conductive part of the circuit may be exposed.

5/02

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

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

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

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

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

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

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

If or 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

information very carefully before performing the indicated procedure.

The

CAUTION

ranty.

Instrumentation and accessories shall not be connected to humans.

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

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

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

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

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

854x Laser Diode Mount Series Specifications

This series covers the offering of Laser Diode Mounts (LDM) for use with Continuous LIV Test Solutions. The following products:

2400-LV/2420/2440, 2500/2502, and 2510/2510AT are recommended for use with these products.

PRODUCTS

The following lists the current products in the 854x Laser Diode Mount Series.

• 8542 Dual In-Line Laser Diode Mount Bundle (includes one 8542-301A and CA-321-1A)

• 8544 Butterfly Laser Diode Mount Bundle (includes one 8542-301A and CA-321-1A)

• 8544-TEC Butterfly Laser Diode Mount Bundle (includes one 8542-301A and CA-322-1A)

ACCESSORIES

• 2400-LV/2420/2400 SourceMeter® Instruments1

• 2500/2502 Dual Photodiode Meter

• 2510/2510AT TEC SourceMeter® Instruments (AT: Auto Tune feature)

REFERENCED MOUNT SPECIFICATIONS

Laser Diode Package

Model 8542 8544 8544-TEC

Socket DIL 14 pin Butterfly 14 pin Butterfly 14 pin

Base Plate Position adjustable 0.1 centers 0.1 centers

Laser Temperature Control

TEMPERATURE RANGE: 0°C to +80°C

SENSOR TYPE

2

(Model 8544-TEC Only): 10 kΩ Thermistor, AD592CN

CONNECTOR/CABLE ASSEMBLY SIGNALS

DB9 24x0 / 2500 Function DB15

1 1 Yellow TEC+ Out TE HI (A) TEC+ Out (1) TE HI (A)
2 Triax Inner Shield 3 2 Green S+ Out TE HI (A) S+ Out (1) TE HI (A)

3 24x0 GND Screw

4 4 Wire Sense LO

5 In/Out LO
6 Triax Outer Shield PD Cathode 6

7 Triax Signal PD Anode 7

8 4 Wire Sense HI Laser Anode 8
9 In/Out HI Laser Anode 9 Yellow TEC+ Out (2) TE HI (B) 4

10 Green S+ Out (2) TE HI (B) 4
11 Red TEC- Out (2) TE LO (B) 4
12 Black S- Out (2) TE LO (B) 4
13

Laser Diode Control

8542-301A

Wire

Color

Chassis

GND

Laser

Cathode 4 Black S- Out TE LO (A) S- Out (1) TE LO (A)

Laser

Cathode

3 Red TEC- Out TE LO (A) TEC- Out (1) TE LO (A)

5

White

Orange

Blue

Brown

White

14

Orange

Blue

15

Brown

Single Temperature

Control Cable

CA-321-1A

2510 Function 2- 2510s Function

F+ In,

S+ In Sensor HI (A)
F- In,

S- In Sensor LO (A)

Dual Temp. Control Cable

CA-322-1A

F+ In,

S+ In (1) Sensor HI (A)

F- In,

S- In (1) Sensor LO (A)

F+ In,

S+ In (2) Sensor HI (B) 4

F- In,

S- In (2) Sensor LO (B) 4

HW 10/15/02

Rev. A

Page 1 of 2

854x Laser Diode Mount Series Specifications

GENERAL SPECIFICATIONS

RECOMMENDED MAXIMUM RATINGS5:

Drive Current (Amps): 2
Measured Voltage (Volts): 3

WEIGHT

DIMENSIONS

Notes

1. The other SourceMeter® offerings from Keithley, 2400, 2410, 2425, and 2430 are not recommended for use with the 8542-301 and Laser Diode Mounts unless proper interlock

2. The 8544-TEC unit is shipped with the 10 kΩ Thermistor wired. This is the more common requested configuration. The AD592CN sensor wires are available but not connected.

3. The Triax inner shield is available on pin 2 of 8542-301A. This will allow flexibility for the customer to exchange the wire in the LDM from pin 6 to pin 2.

4. To use the second 2510 (DB-15 pins 9-15), the customer must internally wire the 8544-TEC Mount to the DUT thermocouple. See Quick Start Guide for wiring configuration.

5. Applies Ratings based on use of Mount with provided Cables and average majority of laser diode characteristics.

6. The weight and dimension is the mounting unit without the cables.

6

: 1.0 lbs (0.45 kg).

6

: 1.25(32) x 3.75(95) x 5.5 (140)

and safety precautions are observed (esp. voltage protection).

HW 10/15/02

Rev. A

Page 2 of 2

Table of Contents

1 General Overview

General Information ................................................................... 1-2

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

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

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

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

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

Product overview ........................................................................ 1-3

Butterfly style mount ........................................................... 1-3

Dual in-line mount .............................................................. 1-3

Available models ................................................................. 1-3

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

2 Getting Started

Laser safety precautions ............................................................. 2-2

Wiring the mount (pinout configuration) ................................... 2-3

Laser diode package mounting .................................................. 2-9

8544-TEC (only) ................................................................. 2-9

Connecting the Model 854x ..................................................... 2-10

Photodiode connection ............................................................. 2-12

Unbiased internal diode connection procedure ................. 2-12

Biased internal diode connection procedure ..................... 2-12

Unbiased, low noise internal diode connection procedure 2-13

TEC cooled devices .................................................................. 2-13

Externally cooled device connection ................................ 2-14

External and Internally cooled device connection ............ 2-14

Autotuning ............................................................................... 2-14

Programming example: Model 2510 TEC SourceMeter .......... 2-16

List of Illustrations

2 Getting Started

Figure 2-1 Removing the bottom plate ..................................................... 2-4

Figure 2-2 Configuring pinouts 854x series (not 8544-TEC) ................... 2-5

Figure 2-3 Configuring pinouts on 8544-TEC .......................................... 2-6

Figure 2-4 Cable pinouts ........................................................................... 2-8

Figure 2-5 Laser diode package mounting ............................................... 2-9

Figure 2-6 Connecting the Model 854x .................................................. 2-11

List of Tables

2 Getting Started

Table 2-1 Model 8544-TEC DB-15 Wiring Chart —Pre-wired ..............2-7

Table 2-2 Model 8544-TEC DB-15 Wiring Chart —Optional ................ 2-7

Table 2-3 Internal TEC Specifications (8544-TEC) ..............................2-14

Table 2-4 Programming example........................................................... 2-15

1

General Overview

1-2 General Overview Model 854x Series Laser Diode Mount Quick Start Guide

General Information

Warranty information

Warranty information is located at the front of this guide. Should your Model 854x Series
Laser Diode Mount require warranty service, contact the Keithley representative or autho­rized repair facility in your area for further information. When returning the unit for repair,
be sure to fill out and include the service form at the back of this guide to provide the
repair facility with the necessary information.

Contact information

Worldwide phone numbers are listed at the back of this guide. If you have any questions,
please contact your local Keithley representative or call one of our application engineers
at 1-800-348-3735 (U.S. and Canada only). Check www.keithley.com for additional infor­mation.

Specifications

NOTE

Model 854x Series Laser Diode Mount specifications shown at the front of this guide were
current at the time of duplication, but they are subject to change without notice. For the
most recent specifications, refer to the web site at www.keithley.com.

Specifications are subject to change without notice.

Safety symbols and terms

The following symbols and terms may be found on an instrument or used in this guide.

If or 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

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

The

CAUTION

ment. Such damage may invalidate the warranty.

heading used in this guide explains dangers that might result in personal

heading used in this guide explains hazards that could damage the instru-

Model 854x Series Laser Diode Mount Quick Start Guide General Overview 1-3

Inspection

The Model 854x Series Laser Diode Mount (LDM) was carefully inspected before ship­ment. After unpacking all items from the shipping carton, check for any obvious signs of
physical damage that may have occurred during transit. Report any damage to the shipping
agent immediately. Save the original packing carton for possible future shipment. The fol­lowing items are included with every Model 854x Laser Mount order:

• Model 854x Laser Mount.

• Product Information CD-ROM that contains a PDF of this Quick Start Guide.

• LIV cable (8542-301)—use with the 2400-LV, 2420, 2440, and 2500 (all 854x
series models)

• Temperature control cables (models CA-321 and CA-322)—use with the 2510.
Use the single cable (CA-321) with the 8542 and 8544, and the dual cable (CA-

322) with the 8544-TEC.

Product overview

WARNING

Model 854x LDMs are specifically designed to provide for temperature and LIV (Light
Intensity-Current-Voltage) testing on a Laser Diode package (DUT not included). Both
butterfly and dual in-line style mounts are available.

Butterfly mount

• 14-pin swing latch flatpack test socket and mounting baseplate

• 0.1" pin centers

Dual in-line mount

• 14-pin zero insertion force socket

• adjustable baseplate

Available models

See the product specifications for product list and key characteristics.

It is not recommended that the cable and mount be used with the fol­lowing Keithley source products: Models 2400, 2410, 2425, and 2430.
These products can output hazardous voltages.

1-4 General Overview Model 854x Series Laser Diode Mount Quick Start Guide

Configuration

The DB-9 and DB-15 connections are manually configured by changing pigtail connec­tions on the internal screw terminal strips. Refer to Section 2 for detailed information.

2

Getting Started

2-2 Getting Started Model 854x Series Laser Diode Mount Quick Start Guide

Laser safety precautions

WARNING

Model 854x Laser Diode Mounts do not contain a laser but are
designed to be used with laser diode devices. Use the following safety
practices to protect operators and other users of this product from
potential exposure to laser radiation:

•

Protect operators from radiation and electrical hazards at all
times.

•

Make sure the installer complies with all applicable laws and regu­lations on laser safety including, but not limited to, warning signs
and operator training.

•

Use test fixtures with an interlock that disables the circuit (source
outputs inhibited) when the operator can be exposed to radiation.
Do not defeat the interlock under any operating conditions.

•

Provide service personnel proper protection equipment (e.g., laser
safety goggles) when servicing the test system.

•

Make sure the customer's laser safety officer (LSO) reviews and
approves all installations before the installation is put into opera­tion. Report all safety issues to the customer's LSO immediately.

•

Do not leave any connections exposed when making connections.
Be sure that all external circuits are properly insulated.

Operate instruments in a safe manner. Follow all applicable safety regula­tions for installing, configuring, and using the Keithley Models 2400-LV,
2420, 2440, 2500, 2502, 2510, and 2510-AT. Each model, as installed,
should be approved by the appropriate safety personnel, such as the
responsible Laser Safety Officer or equivalent. Suggested starting points
for workplace regulations and standards: ANSI Z136.1, IEC 825, OSHA
29 CFR 1910.

Be aware of workplace hazards, strive to minimize them, and work
safely.

Model 854x Series Laser Diode Mount Quick Start Guide Getting Started 2-3

Wiring the mount (pinout configuration)

The wiring to the laser diode is user configurable. This provides flexibility to accommo­date various pinout configurations. Use the following procedure to configure the wiring.
Also refer to Figures 2-1, 2-2, 2-4, and the associated tables contained in the specifications
located at the beginning of this manual.

1. Remove power from the device.

2. Unscrew the four screws on the bottom of the mount (Figure 2-1) to remove the
bottom plate and allow access to the wires and terminal strip (Figures 2-2 and 2-3).

3. Configure the mounts wiring as desired.

• For identification of the specific laser mount pinouts, refer to the specific type
of laser diode package (either dual-inline or butterfly) in Figure 2-1.

• For wire identification, refer to the pinouts and pigtail color codes for the DB-9
and DB-15 connectors (Figures 2-2 and 2-3). A guide is also contained on the
printed circuit board.

• Cable pinouts are shown in Figure 2-4. For wire color, use, and function infor­mation, refer to the specifications shown at the front of this guide.

• To remove a pigtail from a connector, loosen the applicable screw terminal and
remove the wire.

• To attach a pigtail to a connector, determine the terminal number, loosen the
applicable screw terminal (if needed), insert the wire, and secure with the
screw.

• Make sure all connections are secure.

4. Attach the bottom plate of the mount securing with the four screws removed in step 2.

2-4 Getting Started Model 854x Series Laser Diode Mount Quick Start Guide

Figure 2-1

Removing the bottom plate

NOTE: Laser diode packages are not included

with Model 854x mounts.

Dual in-line
mount
laser diode
package

Screw
(4 places)

Bottom plate

Model 8542

14

1

8

7

Model 8544/8544-TEC

14

8

1

7

Screw
(4 places)

Bottom plate

Butterfly
mount laser
diode
package

Model 854x Series Laser Diode Mount Quick Start Guide Getting Started 2-5

Figure 2-2

Configuring pinouts 854x series (not 8544-TEC)

Model 854X

Laser diode

driver connection

Temperature controller

connection

DB-9 Connector

DB-9 Pigtail
Pin # Color Function

3 Brown Chassis GND
4,5 Black Laser Cathode
6 White PD Cathode (-)
7 Green PD Anode (+)
8,9 Red Laser Anode

Input Screw

Terminals

14

13

12

11

10

9

8

DB-15 Connector

DB-15 Pigtail
Pin # Color Function

1,2 Orange TE (+)
3,4 Grey TE (-)
7 Violet Sensor (+)
8 Blue Sensor (-)

1

2

3

4

5

6

7

Laser diode

driver connection

DB-9 Connector DB-15 Connector

Temperature controller

connection

2-6 Getting Started Model 854x Series Laser Diode Mount Quick Start Guide

Figure 2-3

Configuring pinouts on 8544-TEC

Model 8544-TEC

Input Screw

Terminals

14

13

12

11

10

9

8

Laser diode

driver connection

DB-9 Connector

DB-9 Pigtail
Pin # Color Function

3 Brown Chassis GND
4,5 Black Laser Cathode
6 White PD Cathode (-)
7 Green PD Anode (+)
8,9 Red Laser Anode

1

2

3

4

5

6

7

TE cooler
module

Laser diode

driver connection

DB-9 Connector DB-15 Connector

Temperature controller

connection

NOTE The 8544-TEC Fixture also comes with an

Analog devices AD592CN temperature
sensor installed but not connected.

NOTE Refer to Tables 2-1 and 2-2 for wiring charts.

Model 854x Series Laser Diode Mount Quick Start Guide Getting Started 2-7

Table 2-1

Model 8544-TEC DB-15 wiring chart (pre-wired)

NOTE

Table 2-2

Model 8544-TEC DB-15 wiring chart (optional)

NOTE

This table contains the default connections.

DB-15

Pin Number Function

1,2 Fixture TE (+)

3,4 Fixture TE (-)

7 Fixture sensor (+) (10K Thermistor Default)

8 Fixture sensor (-) (10K Thermistor Default)

This table contains the connections required for fixture and internal DUT TEC
control (Cable CA-322-*)

DB-15 pin number Function

9 and 10 DUT TE (+)

11 and 12 DUT TE (-)

14 DUT sensor (+)

.

15 DUT sensor (-)

2-8 Getting Started Model 854x Series Laser Diode Mount Quick Start Guide

Figure 2-4

Cable pinouts

Model 8542-301A

DB-9

5 1

9 6

Model CA-321-1A

Terminal block

GND Lug

DB-15

Signal

Banana plug (2)

Outer shield

3-lug Triax

Inner shield

18

915

Model CA-322-1A

Terminal block 2

Terminal block 1

18

915

DB-15

Model 854x Series Laser Diode Mount Quick Start Guide Getting Started 2-9

Laser diode package mounting

Place the laser diode package in the connector (see Figure 2-5). After securing it with the
swing-latches or ZIF socket lever, fasten it to the block with hardware.

Figure 2-5

Laser diode package mounting

NOTE Laser diode packages are not included

Dual in-line
mount
laser diode
package

with Model 854x mounts.

S.H.C.S.
4-40x3/8"
2 places

ZIF socket lever
(shown in unsecured
position)

Butterfly
mount laser
diode
package

Hood
(8544-TEC
only)

S.H.C.S.
2-56 x 1/4"
4 places

Swing-latches
(shown in
unsecured
position)

Model 8542 Model 8544 and

8544-TEC (only)

After the package is properly mounted, install the aluminum 2x2x1" black hood. This iso­lates and stabilizes the laser diode package temperature from external ambient changes.

Model 8544-TEC

2-10 Getting Started Model 854x Series Laser Diode Mount Quick Start Guide

Connecting the Model 854x

Using Figure 2-6 as a guide, make electrical connections as desired. Use the following
procedure as a guide.

1. Connect 8542-301 cable (DB-9).

• Connect the DB-9 end of the cable to the 854x’s DB9 connector.

• Connect the banana plugs to the Input/Output and 4-Wire Sense of the 24×0.

• Connect the triax connector to either Input Channel of the 2500.

• Connect the ground lug to the ground screw of the 24x0 back panel.

2. Connect the CA-321 / CA-322 cable (DB-15).

NOTE

WARNING

Use cables 8542-301 and CA-322 with the Model 8544-TEC mount. Use cables
8542-301 and CA-321 with all other 854x series mounts.

• Connect the DB-15 connector end of the CA-321 cable to the 8542 or 8544

• Connect the 8-pin terminal block end of the CA-321 / CA-322 cable to the

DB-15 connector. (Connect the DB-15 connector end of the CA-322 if using
the 8544-TEC.)

2510 Input/Output Connector.

It is not recommended that the Model 854x series mounts/cables be
used with the following Keithley source products: Models 2400, 2410,
2425, and 2430. These products can output hazardous voltages.

Model 854x Series Laser Diode Mount Quick Start Guide Getting Started 2-11

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

.

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.

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.

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.

Figure 2-6

Connecting the Model 854x

Ground lug

5V

HI

Model 8542-301A

Note: Model 8544-TEC shown

(others similar).

Banana
plugs (2)

250V

PEAK

Triax
Connector

CHANNEL 1

VOLTAGE SOURCE

OUTPUT CHANNEL 1

PK

V, Ω,

GUARD

5V

250V

5V

PEAK

PEAK

PEAK

LO

4-WIRE
SENSE

!

(ENTER IEEE ADDRESS

WITH FRONT PANEL MENU)

IEEE-488

INPUT/

OUTPUT

GUARD

SENSE

250V

CAT I

PEAK

RS-232

Model 2400-LV/2420/2440

SourceMeter

Note: Enable ground connect

mode.

RATINGS MAX
100V @ 20mA

COMMON

MADE IN

MODE

U.S.A.

200V

INPUT

INPUT

CHANNEL 2

!

TRIGGER LINK

CAT

I

RATINGS MAX
100V @ 20mA

VOLTAGE SOURCE
OUTPUT CHANNEL 2

MADE IN

U.S.A.

LINE FUSE

SLOWBLOW

2.5A, 250V

LINE RATING

100-240VAC

50, 60, Hz

190VA MAX.

FUSE DRAWER

TRIGGER

LINK

(CHANGE IEEE ADDRESS

DIGITAL I/O

RS-232

LINE RATING

50, 60Hz

60 VA MAX

FUSE LINE

100 VAC

630 mAT

120 VAC

(SB)

!

220 VAC

315 mAT

240 VAC

(SB)

WITH FRONT PANEL MENU)

120

IEEE-488

U

CUS

LISTED

SourceMeter

4ZA4

OUTPUT
ENABLE

L

Model CA-322-1A

Optional
Model CA-321-1A

Model 2500/2502

Dual Photodiode Meter

CAT

I

!

MADE IN

OUTPUT INPUT

F+ S+ S- F- F+ F- S+ S-

ISOLATION FROM EARTH: 30V MAX.

U.S.A.

TRIGGER

LINK

!

Model 2510/2510-AT

TEC SourceMeter

CAT

I

!

MADE IN

OUTPUT INPUT

F+ S+ S- F- F+ F- S+ S-

ISOLATION FROM EARTH: 30V MAX.

U.S.A.

TRIGGER

LINK

!

Model 2510/2510-AT

TEC SourceMeter

ENABLE-DIG I/O

RS-232

LINE FUSE

SLOWBLOW

2.5A, 250V

LINE RATING

100-240VAC

50, 60 HZ

90VA MAX

ENABLE-DIG I/O

RS-232

LINE FUSE

SLOWBLOW

2.5A, 250V

LINE RATING

100-240VAC

50, 60 HZ

90VA MAX

120

120

IEEE-488

(ENTER IEEE ADDRESS

WITH FRONT PANEL MENU)

IEEE-488

(ENTER IEEE ADDRESS

WITH FRONT PANEL MENU)

2-12 Getting Started Model 854x Series Laser Diode Mount Quick Start Guide

Photodiode connection

The 854x series of laser diode fixtures utilize a connection for monitoring internal photo­diodes (rear facet) with the Keithley Model 2500/2502 Dual Photodiode Meter. The stan­dard wiring configuration of the 854x series allows the user to operate the internal
photodiode in a biased or unbiased state.

Unbiased internal diode connection procedure

NOTE

This procedure uses the default standard wiring configuration of the 854x
series—the bottom does not have to be removed and configuration changed
unless it has been changed from the default configuration.

1. Connect cable, instruments, and DUT to the Model 854x (see Connecting the

Model 854x on page page 2-10).

2. Enable ground connect on the Model 2500/2502.

• From the front panel, press CONFIG>SRC <n> where n is 1 or 2 > ENABLE.

• Remotely, send :SOUR1:GCON ON for channel 1, :SOUR2:GCON ON for
channel 2.

3. Set the source voltage to 0V.

Biased internal diode connection procedure

NOTE

This procedure uses the default standard wiring configuration of the 854x series.
The bottom does not have to be removed and configuration changed unless it has
been changed from the default configuration.

1. Connect cable, instruments, and DUT to the 854x (see Connecting the Model 854x
on page page 2-10).

2. Enable ground connect on the Model 2500/2502.

• From the front panel, press CONFIG>SRC <n> where n is 1 or 2 > ENABLE.

• Remotely, send :SOUR1:GCON ON for channel 1, :SOUR2:GCON ON for
channel 2.

3. Set the source voltage to desired bias value for detector.

Model 854x Series Laser Diode Mount Quick Start Guide Getting Started 2-13

Unbiased, low noise internal diode connection procedure

This technique will provide the lowest noise measurements by eliminating ground loops
between the instrument and the fixture, but disables the ability to bias the internal diode.
See the Keithley 2500/2502 User’s Manual (Section 3) on the Product Information CD
included with your shipment for more details.

NOTE

NOTE

This procedure uses a specific wiring configuration of the 854x series. Remove the
bottom plate and change the wiring configuration as detailed in the procedure.

1. Open the bottom cover of the 854x fixture.

2. De-solder the wire connected to PIN 6 on the DB-9 input connector. See Wiring

the mount (pinout configuration) on page 2-3 for internal wiring connections of the

854x fixture.

3. Re-attach wire previously connected to PIN 6 to PIN 2 on the DB-9 input connec­tor.

4. Replace and secure the bottom cover of the 854x fixture.

5. Connect cable, instruments, and DUT to the 854x (see Connecting the Model 854x
on page 2-10).

6. Disable ground connect on the Model 2500/2502.

• From the front panel, press CONFIG>SRC <n> where n is 1 or 2 > DISABLE.

• Remotely, send :SOUR1:GCON ON for channel 1, :SOUR2:GCON ON for
channel 2.

7. Set the source voltage to 0V. This connection scheme does not allow for detector
bias.

Photodiodes can be damaged by excess bias voltages in both the positive and
reverse direction. This guide assumes that the diode was oriented such that a
positive bias voltage from the Model 2500/2502 would reverse bias the diode.
Always double-check your wiring and connections to avoid damaging the
device.

TEC cooled devices

Many packaged laser diodes have TEC (Peltier) temperature control. During laser oper­ation, the TEC is used to maintain the diode at a user specified temperature. The Keithley
854x series of laser diode fixtures and cables are designed to work in conjunction with the
Keithley Model 2510 and 2510-AT TEC Sourcemeter Instruments to provide an accurate
and stable temperature control unit for cooled devices.

The Keithley 8544-TEC has an additional TEC located internal to the fixture. It can be
used to control the "environmental" temperature of packaged devices with internal cooling
or to temperature control uncooled devices.

2-14 Getting Started Model 854x Series Laser Diode Mount Quick Start Guide

Table 2-3

Internal TEC Specifications (8544-TEC)

Specification Value/Range

Temperature range
TEC Power
TEC Maximum Voltage/Current

0–80˚C
16 Watts

7.6V at 3.9A

Externally cooled device connection

NOTE

This is the default wiring for the 8544-TEC Fixture. It utilizes the TEC and temperature
sensor of the 8544-TEC fixture. See Figure 2-3 and Table 2-1 for details. The following
are the A, B, and C coefficients for a 10K thermistor:

This configuration uses a single Model 2510.

A = 1.129241 × 10
B = 2.341077 × 10
C = 0.877547 × 10

-3

-4

-7

External and Internally cooled device connection

NOTE

This configuration uses two Model 2510s (2510-AT) and a cable (CA-322-*) to actively
control the temperature of the DUT using its internal TEC as well as the fixture TEC.

This configuration will require additional wiring by the user. See Figure 2-3 and Table 2-2
for details.

This configuration uses dual Model 2510s.

Autotuning

The Keithley Model 2510 series of TEC controllers utilize a Proportional, Integral, and
Derivative (PID) algorithm to optimize settling time and stability. In the past, the P, I, and
D values had to be determined in a time consuming manual method of trial and error. The
Keithley Model 2510-AT Autotuning TEC Sourcemeter accelerates test setup and temper­ature control optimization. This is accomplished by automatically determining the PID
coefficients for a particular thermal load. The following two sets of coefficients are
returned to the Model 2510-AT:

Use GPIB to control autotuning (front panel control is not available).

• coefficients optimized for minimum settling time

• coefficients optimized minimum overshoot

Model 854x Series Laser Diode Mount Quick Start Guide Getting Started 2-15

For more details on the Keithley Model 2510/2510-AT and Autotuning, refer to the Model
2510/2510-AT User’s Manual and the Keithley Applications Note "Optimizing TEC PID
Coefficients Automatically with the Model 2510-AT Autotuning TEC SourceMeter®
Instrument". Both of these are PDFs on the product information CD-ROM received with
your shipment.

NOTE

Additional information is also available on the web at www.keithley.com.

Programming example: Model 2510 TEC SourceMeter

The code fragment contained in Table 2-4 is a subroutine that conditionally sets up the fol-
lowing Model 2510 operating modes:

• Current protection limit: 1A

• Sensor type: thermistor

• Thermistor sensor current range: auto

• Thermistor sensor measurement range: 10 k

• Temperature setpoint: set during program execution

Table 2-4

Programming example

Private Sub comboTempOnOff_Click()

If comboTempOnOff.Text = "ON" Then

Call send(intKth2510, "*rst", intStatus)
Call send(intKth2510, ":sens:curr:prot:lev 1.0", intStatus) ' 1A current limit
Call send(intKth2510, ":sens:temp:tran ther", intStatus) ' Thermistor sensor type
Call send(intKth2510, ":sens:temp:curr:auto on", intStatus) ' Auto sensor current range
Call send(intKth2510, ":sens:temp:ther:range 1e4", intStatus) ' 10k ohm sensor resistance range
Call send(intKth2510, ":sour:temp:spo " & comboTempSetPoint.Text, intStatus) ' Program setpoint
Call send(intKth2510, ":outp on", intStatus) ' Turn on output
Call send(intKth2510, ":meas:res:ac?", intStatus) ' Get TEC AC resistance
Call enter(strData, 100, intLength, intKth2510, intStatus)
txtTECRes.Text = strData
Call send(intKth2510, ":outp on", intStatus)

Else

Call send(intKth2510, "*rst", intStatus)

End If

End Sub

Model 2510 TEC SourceMeter

Service Form

Model No. _______________ Serial No. __________________ Date _________________

Name and Telephone No. ____________________________________________________

Company _______________________________________________________________________

List all control settings, describe problem and check boxes that apply to problem. _________________________

__________________________________________________________________________________________

__________________________________________________________________________________________

❑

Intermittent

❑

IEEE failure

❑

Front panel operational❑All ranges or functions are bad

Display or output (check one)

❑

Drifts

❑

Overload

❑

Calibration only

(attach any additional sheets as necessary)

Show a block diagram of your measurement including all instruments connected (whether power is turned on or
not). Also, describe signal source.

❑

Analog output follows display

❑

Obvious problem on power-up

❑

Unable to zero

❑

Will not read applied input

❑

Certificate of calibration required

❑

Particular range or function bad; specify

_______________________________

❑

Batteries and fuses are OK

❑

Checked all cables

❑

Unstable

❑

Data required

Where is the measurement being performed? (factory, controlled laboratory, out-of-doors, etc.)_______________

__________________________________________________________________________________________

What power line voltage is used?___________________ Ambient temperature? ________________________°F

Relative humidity? ___________________________________________Other? __________________________

Any additional information. (If special modifications have been made by the user, please describe.)

__________________________________________________________________________________________

__________________________________________________________________________________________

Be sure to include your name and phone number on this service form.

Specifications are subject to change without notice.

All Keithley trademarks and trade names are the property of Keithley Instruments, Inc.
All other trademarks and trade names are the property of their respective companies.

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

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© Copyright 2002 Keithley Instruments, Inc.

Printed in the U.S.A.

10/02