Lightwave Communications LDT-5525 User Manual
User’s Guide
Temperature Controller
LDT-5525
ILX Lightwave Corporation · P. O. Box 6310 · Bozeman, MT, U.S.A. 59771 · U.S. & Canada: 1-800-459-9459 · International Inquiries: 406-556-2481 · Fax 406-586-9405
ilx.custhelp.com · www.ilxlightwave.com
70019904_07_01
TABLE OF CONTENTS
TABLE OF CONTENTS
Safety Information and the Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .vii
General Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .vii
Safety Marking Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viii
Comments, Suggestions, and Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi
Chapter 1 Introduction and Specifications
Product Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Available Options and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Chapter 2 Operation
AC Power Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Rack Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Power-Up Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Introduction to the LDT-5525 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Parameter Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
SENSOR CAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Control Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Error Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Analog Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Back Panel Controls and Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
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TABLE OF CONTENTS
SENSOR SELECT Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
TEC Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
TEC Grounding Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
General Operating Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Warm-Up and Environmental Considerations . . . . . . . . . . . . . . . . . . . . . . . 15
Temperature Mode Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Resistance Mode Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
External Safety Switch Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Booster Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Chapter 3 Maintenance and Troubleshooting
Calibration Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Recommended Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Environmental Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Warm Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Calibration Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Thermistor Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
AD590 Sensor Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
LM335 Sensor Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
ITE Current Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Appendix A Steinhart-Hart Equation
Computer Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Appendix B Sensing Current and Thermistor Selection
Thermistor Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Temperature Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Selecting the Sensing Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
ii LDT-5525
Selecting and Using Thermistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
TABLE OF CONTENTS
Appendix C AD590 and LM335 Sensor Calibration
AD590 Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
LM335 Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
One Point Calibration Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Two Point Calibration Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
06_07 LDT-5525 iii
TABLE OF CONTENTS
iv LDT-5525
LIST OF FIGURES
LIST OF FIGURES
Figure 2.1 LDT-5525 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Figure 2.2 LDT-5525 Back Panel . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Figure 2.3 Back Panel TEC Connector . . . . . . . . . . . . . . . . . . . . . .13
Figure A.1 Thermistor Resistance vs. Temperature . . . . . . . . . . . . .28
Figure B.1 Thermistor Temperature Range . . . . . . . . . . . . . . . . . . .34
Figure C.1 AD590 Nonlinearity . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
06_07 LDT-5525 v
LIST OF FIGURES
vi LDT-5525
SAFETY AND WARRANTY INFORMATION
The Safety and Warranty Information section provides details about cautionary
symbols used in the manual, safety markings used on the instrument, and
information about the Warranty including Customer Service contact information.
Safety Information and the Manual
Throughout this manual, you will see the words Caution and Warning indicating
potentially dangerous or hazardous situations which, if not avoided, could result in
death, serious or minor injury, or damage to the product. Specifically:
Caution indicates a potentially hazardous situation which can result in minor or
moderate injury or damage to the product or equipment.
Warning indicates a potentially dangerous situation which can result in serious injury or
death.
WARNING
Visible and/or invisible laser radiation. Avoid direct exposure to the beam.
General Safety Considerations
If any of the following conditions exist, or are even suspected, do not use the
instrument until safe operation can be verified by trained service personnel:
• Visible damage
• Severe transport stress
• Prolonged storage under adverse conditions
• Failure to perform intended measurements or functions
If necessary, return the instrument to ILX Lightwave, or authorized local ILX
Lightwave distributor, for service or repair to ensure that safety features are
maintained (see the contact information on
All instruments returned to ILX Lightwave are required to have a Return
Authorization Number assigned by an official representative of ILX Lightwave
Corporation.
See Returning an Instrument on page ix for more information.
page xi).
LDT-5525 vii
SAFETY SYMBOLS
SAFETY SYMBOLS
This section describes the safety symbols and classifications.
Technical specifications including electrical ratings and weight are included within
the manual. See the Table of Contents to locate the specifications and other
product information. The following classifications are standard across all ILX
Lightwave products:
• Indoor use only
• Ordinary Protection: This product is NOT protected against the harmful ingress of moisture.
• Class I Equipment (grounded type)
• Mains supply voltage fluctuations are not to exceed ±10% of the nominal supply voltage.
• Pollution Degree II
• Installation (overvoltage) Category II for transient overvoltages
• Maximum Relative Humidity: <80% RH, non-condensing
• Operating temperature range of 0 °C to 40 °C
• Storage and transportation temperature of –40 °C to 70 °C
• Maximum altitude: 3000 m (9843 ft.)
• This equipment is suitable for continuous operation.
Safety Marking Symbols
This section provides a description of the safety marking symbols that appear on
the instrument. These symbols provide information about potentially dangerous
situations which can result in death, injury, or damage to the instrument and other
components.
Caution,
refer to
manual
Caution, risk
of electric
shock
On: In position of a bistable push control.
The slash (I) only denotes that mains are on.
or
(I)
Earth
ground
Te r mi n a l
Protective
Conductor
Te r mi n a l
Alternating
current
Caution, hot
surface
Off: Out position of a bistable push control.
The circle (O) only denotes that mains are off.
or
(O)
Visible and/or
invisible laser
radiation
Frame or
chassis
Te r mi n a l
viii LDT-5525
WARRANTY
ILX LIGHTWAVE CORPORATION warrants this instrument to be free from
defects in material and workmanship for a period of one year from date of
shipment. During the warranty period, ILX will repair or replace the unit, at our
option, without charge.
Limitations
This warranty does not apply to fuses, lamps, defects caused by abuse,
modifications, or to use of the product for which it was not intended.
This warranty is in lieu of all other warranties, expressed or implied, including any
implied warranty of merchantability or fitness for any particular purpose. ILX
Lightwave Corporation shall not be liable for any incidental, special, or
consequential damages.
WAR RA NT Y
If a problem occurs, please contact ILX Lightwave Corporation with the
instrument's serial number, and thoroughly describe the nature of the problem.
Returning an Instrument
If an instrument is to be shipped to ILX Lightwave for repair or service, be sure to:
1 Obtain a Return Authorization number (RA) from ILX Customer Service.
2 Attach a tag to the instrument identifying the owner and indicating the required service or
repair. Include the instrument serial number from the rear panel of the instrument.
3 Attach the anti-static protective caps that were shipped with the instrument and place the
instrument in a protective anti-static bag.
4 Place the instrument in the original packing container with at least 3 inches (7.5 cm) of
compressible packaging material. Shipping damage is not covered by this warranty.
5 Secure the packing box with fiber reinforced strapping tape or metal bands.
6 Send the instrument, transportation pre-paid, to ILX Lightwave. Clearly write the return
authorization number on the outside of the box and on the shipping paperwork. ILX
Lightwave recommends you insure the shipment.
If the original shipping container is not available, place your instrument in a
container with at least 3 inches (7.5 cm) of compressible packaging material on all
sides.
Repairs are made and the instrument returned transportation pre-paid. Repairs
are warranted for the remainder of the original warranty or for 90 days, whichever
is greater.
06_07 LDT-5525 ix
WAR RA NT Y
Claims for Shipping Damage
When you receive the instrument, inspect it immediately for any damage or
shortages on the packing list. If the instrument is damaged, file a claim with the
carrier. The factory will supply you with a quotation for estimated costs of repair.
You must negotiate and settle with the carrier for the amount of damage.
x LDT-5525
WAR RA NT Y
Comments, Suggestions, and Problems
To ensure that you get the most out of your ILX Lightwave product, we ask that
you direct any product operation or service related questions or comments to ILX
Lightwave Customer Support. You may contact us in whatever way is most
convenient:
Phone . . . . . . . . . . . . . . . . . . . . . . . . . . . (800) 459-9459 or (406) 586-1244
Fax . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (406) 586-9405
On the web at: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ilx.custhelp.com
Or mail to:
ILX Lightwave Corporation
P. O. Box 6310
Bozeman, Montana, U.S.A 59771
www.ilxlightwave.com
When you contact us, please have the following information:
Model Number:
Serial Number:
End-user Name:
Company:
Phone:
Fax:
Description of what is
connected to the ILX
Lightwave instrument:
Description of the problem:
If ILX Lightwave determines that a return to the factory is necessary, you are
issued a Return Authorization (RA) number. Please mark this number on the
outside of the shipping box.
You or your shipping service are responsible for any shipping damage when
returning the instrument to ILX Lightwave; ILX recommends you insure the
shipment. If the original shipping container is not available, place your instrument
06_07 LDT-5525 xi
WAR RA NT Y
in a container with at least 3 inches (7.5 cm) of compressible packaging material
on all sides.
We look forward to serving you even better in the future!
xii LDT-5525
CHAPTER 1
INTRODUCTION AND SPECIFICATIONS
This manual contains operation and maintenance information for the LDT 5525
Temperature Controller. If you want to get started right away, read Chapter 2,
which covers Operation, first.
Product Overview
The LDT-5525 Temperature Controller is a microprocessor-based, precision
thermoelectric temperature controller designed for temperature control of laser
diodes, detectors and other temperature sensitive devices. The LDT 5525 ca n be
used for laser diode testing, laser diode frequency stabilization, IR detector
cooling, and to determine the characteristics of electronic devices. The LDT-5525
combines high analog stability with the versatility of a microprocessor-based
instrument. The internal microprocessor controls the operation of the LDT-5525
and performs the non-linear conversion of thermistor resistance to temperature
based on two user-defined constants.
You can configure the LDT-5525 to operate with a wide variety of thermistor
temperature sensors and TE modules, as well as AD590 series and LM335 series
temperature sensors.
Features of the LDT-5525 include:
• Intuitive front panel layout
• Large and easy-to-read green LED display
• Display resolution of 0.1 degree Centigrade
• Output current limit control to safely operate al l TE coolers
• Configurable for a variety of thermal sensors
• Output will supply 4 amps, 24 Watts
• Closed-case calibration
LDT-5525 1
CHAPTER 1
Available Options and Accessories
INTRODUCTION AND SPECIFICATIONS
Product Overview
Options and accessories available for the LDT-5525 Temperature Controller
include the following:
DESCRIPTION MODEL NUMBER
Single Rack mount kit
(enables installation into a standard 19” rack)
134
Dual Rack mount kit
(enables installation of two LDT-5525 instruments into a standard
19” rack)
Temperature Controlled Laser Diode Mount 4407
Temperature Controlled Laser Diode Mount
(available with collimating assembly)
High Power Laser Diode Mount 4442
Temperature Controller Interconnect Cable (unterminated) 501
Calibrated 10 Kohm Thermistor 510
Uncalibrated 10 Kohm Thermistor 520
Uncalibrated AD590LH IC Temperature Sensor 530
Uncalibrated LM335 IC Temperature Sensor 540
135
4412
Other Laser Diode Mounts are available. Please contact ILX Lightwave for
information on additional options for your applications.
2 LDT-5525
Specifications
1
Output
Output Type Bipolar constant current source
Control Algorithm Smart Integrator, Hybrid PI
Compliance Voltage 6 Volts at 4 Amps
Maximum Current Output 4 Amps
Maximum Output Power
Current Limit Control Range
Current Limit Accuracy
Ripple / Noise
Temperature Control
Temperature Range
Sensor Type 2-wire thermistor, LM335 voltage type or AD590
3
INTRODUCTION AND SPECIFICATIONS
Specifications
2
24 Watts, typical
CHAPTER 1
0 to 4.4 Amps
+50 mA
<1 mA
4
-99 to 199.9oC
-20 to +70oC with typical (NTC) 10K thermistor
currenty type
Thermistor Sensing Current 10 µA or 100 µA
Temperature Set Point Resolution 0.1oC
Short Therm Stability
Long Term Stability +0.01oC
1 Output current and power are rated into a 1 ohm load
2 Higher output powers can be accommodated by using an external booster. Contact ILX Lightwave for further
information
3 Broadband noise (10 Hz to 10 MHz) is measured at 1 Amp output current
4 Temperature control range depends primarily on the type of thermistor and TE module used. The range can be
extended higher or lower by selecting appropriate components; see Appendix B for more details
5 Short term temperature stability is a strong function of the thermal environment of the thermistor and TE module;
room air currents in particular can easily cause fluctuations of 0.1
5
+0.005oC
o
C in an exposed mounting configuration
06_07 LDT-5525 3
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