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ILX Lightwave Temperature Controller LDT-5525 User Manual

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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

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Summary of Contents for ILX Lightwave Temperature Controller LDT-5525

  • Page 1 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...

  • Page 3: Table Of Contents

    TA B L E O F C O N T E N T S ABLE OF ONTENTS Safety Information and the Manual ....... . .vii General Safety Considerations .
  • Page 4 TA B L E O F C O N T E N T S SENSOR SELECT Switch ........12 TEC Connector .
  • Page 5 TA B L E O F C O N T E N T S Appendix C AD590 and LM335 Sensor Calibration AD590 Sensor ..........37 LM335 Sensor .
  • Page 6 TA B L E O F C O N T E N T S LDT-5525...
  • Page 7 L I S T O F F I G U R E S IST OF IGURES Figure 2.1 LDT-5525 Front Panel ......8 Figure 2.2 LDT-5525 Back Panel .
  • Page 8 L I S T O F F I G U R E S LDT-5525...

  • Page 9: Safety Information And The Manual

    • 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 page xi).

  • Page 10: Safety Marking Symbols

    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.
  • Page 11 Returning an Instrument If an instrument is to be shipped to ILX Lightwave for repair or service, be sure to: Obtain a Return Authorization number (RA) from ILX Customer Service.
  • Page 12 WA R R A N T 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.

  • Page 13: Comments, Suggestions, And Problems

    WA R R A N T 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.
  • Page 14 WA R R A N T 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! LDT-5525...

  • Page 15: Introduction And Specifications

    C H A P T E R NTRODUCTION AND PECIFICATIONS 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.

  • Page 16: Available Options And Accessories

    Temperature Controller Interconnect Cable (unterminated) Calibrated 10 Kohm Thermistor Uncalibrated 10 Kohm Thermistor Uncalibrated AD590LH IC Temperature Sensor Uncalibrated LM335 IC Temperature Sensor Other Laser Diode Mounts are available. Please contact ILX Lightwave for information on additional options for your applications. LDT-5525...

  • Page 17: Specifications

    +0.01 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.
  • Page 18 I N T R O D U C T I O N A N D S P E C I F I C A T I O N S C H A P T E R Specifications Thermistor Range (10 µA) 0.0 to 450.0 KΩ...
  • Page 19 I N T R O D U C T I O N A N D S P E C I F I C A T I O N S C H A P T E R Specifications General Output Connectors TEC I/O: 15-pin, D-sub Analog Output: BNC Size...
  • Page 20 I N T R O D U C T I O N A N D S P E C I F I C A T I O N S C H A P T E R Specifications LDT-5525...

  • Page 21: Operation

    C H A P T E R PERATION This chapter describes how to install, adjust, and operate the LDT-5525 Temperature Controller. It is divided into sections covering installation, familiarization and adjustment, and normal operating procedures. This chapter also gives an overview of the LDT-5525's front panel features, and it presents a guide to quickly familiarize the user with the front panel operations.

  • Page 22: Power-Up Sequence

    O P E R A T I O N C H A P T E R Power-Up Sequence Power-Up Sequence With the LDT-5525 Series Precision Temperature Controller connected to an AC power source, pressing the POWER switch will supply power to the instrument and start the power up sequence.

  • Page 23: Adjustments

    O P E R A T I O N C H A P T E R Introduction to the LDT-5525 Front Panel Adjustments The ADJUST section contains the Adjust knob for entering values, and it contains the ENBL (adjust enable) switch and indicator. In order to make any adjustment, the ENBL indicator must be lit.

  • Page 24: Parameter Setup

    O P E R A T I O N C H A P T E R Introduction to the LDT-5525 Front Panel The temperature is limited (via the sensor feedback) to the T LIMIT value. If the sensor reads a temperature which is greater than T LIMIT, the I TE output will be shut off.

  • Page 25: Output

    O P E R A T I O N C H A P T E R Introduction to the LDT-5525 Front Panel Appendix C contains information on sensor calibration constants for AD590 and LM335 sensors. Since these devices are used over their linear range, the constants C1 and C2 are used in this case to determine a linear approximation of the temperature, rather than the Steinhart-Hart non-linear approximation which applies for thermistors.

  • Page 26: Analog Output

    O P E R A T I O N C H A P T E R Back Panel Controls and Connections Analog Output An analog output signal is available at the ANALOG OUTPUT connector (BNC) on the front panel. This signal is a voltage between 0 - 5.0 volts which is proportional to the measurement signal.

  • Page 27: Tec Connector

    O P E R A T I O N C H A P T E R Back Panel Controls and Connections Table 2.1 SENSOR SELECT Switch Positions SWITCH POSITION CODE 100 µA -01- 10 µA -02- LM335 -03- AD590 -04- The 10 µA and 100 µA designations are for the current source level;...

  • Page 28: Tec Grounding Considerations

    O P E R A T I O N C H A P T E R Back Panel Controls and Connections TEC Grounding Considerations The TEC outputs of the LDT-5525 are isolated from chassis ground, allowing either output terminal to be grounded at the user's option. Note: For the TEC connector, if any one terminal pin is grounded, then no other terminal pin should be grounded.

  • Page 29: General Operating Procedures

    O P E R A T I O N C H A P T E R General Operating Procedures General Operating Procedures The following sections present some guidelines for operation, as well as some common operating procedures. Warm-Up and Environmental Considerations Operate the LDT-5525 Temperature Controller at an ambient temperature in the range of 0 to +40°C.

  • Page 30: Resistance Mode Operation

    O P E R A T I O N C H A P T E R General Operating Procedures Resistance Mode Operation You can operate the LDT-5525 Temperature Controller in several modes, constant current (I TE), constant thermistor resistance (R), or constant temperature (T). This example is for constant resistance (R) mode.

  • Page 31: Booster Operation

    LDT-5525 Temperature Controller operation, and those loads may require larger or smaller GAIN values in order to settle to the set temperatures in a desirable fashion. Contact ILX Lightwave for more information on using the LDT-5525 with a booster current source. 06_07...
  • Page 32 O P E R A T I O N C H A P T E R General Operating Procedures LDT-5525...

  • Page 33: Maintenance And Troubleshooting

    C H A P T E R AINTENANCE AND ROUBLESHOOTING This chapter describes how to maintain and troubleshoot the LDT-5525 Temperature Controller. Included are sections covering calibration, disassembly, and troubleshooting. THE SERVICE PROCEDURES DESCRIBED IN THIS CHAPTER ARE FOR USE BY QUALIFIED PERSONNEL.

  • Page 34: Recommended Equipment

    M A I N T E N A N C E A N D T R O U B L E S H O O T I N G C H A P T E R Calibration Overview Recommended Equipment Recommended test equipment for calibrating the LDT-5525 Temperature Controller is listed in Table 3.1.

  • Page 35: Calibration Adjustments

    M A I N T E N A N C E A N D T R O U B L E S H O O T I N G C H A P T E R Calibration Adjustments Calibration Adjustments There are two calibration adjustments that need to be made for the LDT-5525 Temperature Controller.

  • Page 36: Ad590 Sensor Calibration

    M A I N T E N A N C E A N D T R O U B L E S H O O T I N G C H A P T E R Calibration Adjustments AD590 Sensor Calibration The following procedure is for calibrating the AD590 sensor measurement so that the temperature measurement will be as accurate as possible.

  • Page 37: Lm335 Sensor Calibration

    M A I N T E N A N C E A N D T R O U B L E S H O O T I N G C H A P T E R Calibration Adjustments LM335 Sensor Calibration The following procedure is for calibrating the LM335 sensor measurement so that the temperature measurement will be as accurate as possible.

  • Page 38: Ite Current Calibration

    M A I N T E N A N C E A N D T R O U B L E S H O O T I N G C H A P T E R Calibration Adjustments ITE Current Calibration The following procedure is for calibrating the ITE constant current source for both polarities of current.

  • Page 39: Troubleshooting

    Read the symptom descriptions, and follow the steps for the corrective actions which apply. If you encounter problems which are beyond the scope of this guide, contact your ILX Lightwave representative. Symptom Causes and Corrective Actions...
  • Page 40 M A I N T E N A N C E A N D T R O U B L E S H O O T I N G C H A P T E R Troubleshooting Unable to adjust output or Check the ADJUST ENBL switch;...
  • Page 41 A P P E N D I X TEINHART QUATION Two-terminal thermistors have a nonlinear relationship between temperature and resistance. The resistance verses temperature characteristics for a family of similar thermistors is shown in Figure A.1. It has been found empirically that the resistance versus temperature relationship for most common negative temperature coefficient (NTC) thermistors can be accurately modeled by a polynomial expansion relating the logarithm of resistance to inverse temperature.

  • Page 42: Figure A.1 Thermistor Resistance Vs. Temperature

    C H A P T E R For the LDT-5525, the Steinhart Hart equation has been simplified to a first order polynomial: 1/T = A' + B' * ln R Equation 2 This equation is easier to solve and provides adequate results. Table A.1 also shows that the use of Equation 2 introduces temperature errors of less than 0.3 over the range -20 C to 50...

  • Page 43: Computer Program

    C H A P T E R Computer Program We have included a computer program called STEIN1 that uses a least squares curve fitting routine to determine the values of C1 and C2. The program is written in IBM's advanced BASICA. You must create a data file for your thermistor that describes the resistance at various temperatures.
  • Page 44 C H A P T E R 80 REM * * * * * * * * * * * * * * STEIN1 * * * * * * * * * * * * * * * 90 REM 92 REM Rev: 3 11 87 94 REM...
  • Page 45 C H A P T E R 1155 X(I)=LOG(R(I)) : Y(I)=1/(T(I)+273.15) 1160 PRINT USING H$; I, T(I), R(I) 1170 GOTO 1130 1180 N=I 1 1190 CLOSE 1200 REM **** accumulate sums **** 1205 SX=0 : SY=0 : SXY=0 : SXX=0 1210 FOR I = 1 TO N 1220 SX=SX+X(I) 1230 SY=SY+Y(I)
  • Page 46 C H A P T E R LDT-5525...

  • Page 47: Appendix B Sensing Current And Thermistor Selection

    A P P E N D I X ENSING URRENT AND HERMISTOR ELECTION Choosing the right sensing current depends on the range of temperature you want to measure and the resolution you require at the highest measured temperature. To correctly set the SENSOR SELECT switch you must understand how the thermistor and the LDT-5525 Temperature Controller interact, and how temperature range and resolution values are inherent in the nature of thermistors.

  • Page 48: Figure B.1 Thermistor Temperature Range

    C H A P T E R Thermistor Range thermistor inputs of the LDT-5525. The LDT-5525's measurement system will over-range when the input voltage exceeds about 4.5 volts. Figure B.1 graphically shows the lower temperature and upper voltage limits for a typical 10 K thermistor.

  • Page 49: Temperature Resolution

    C H A P T E R Thermistor Range Temperature Resolution You must also consider measurement resolution since the measurement resolution decreases as the thermistor temperature increases. A temperature controller (such as the LDT-5525) has a limited measurement resolution. A temperature change of one degree centigrade will be represented by a greater resistance increase at a lower temperature than at a higher temperature because of the non-linear resistance of the thermistor.
  • Page 50 If you require a different temperature range or the accuracy you need can't be achieved with either switch setting, select another thermistor. Thermistor temperature curves, supplied by the manufacture, show the resistance verses temperature range for many other thermistors. ILX Lightwave Corporation will also offer help for your specific application. LDT-5525...

  • Page 51: Appendix C Ad590 And Lm335 Sensor Calibration

    A P P E N D I X AD590 LM335 S ENSOR ALIBRATION The LDT-5525 Temperature Controller uses two constants (C1 and C2) for calibrating linear thermal sensing devices, such as the AD590, and the LM335. C1 is used as the linear or zero offset value, and C2 is used as the slope or gain adjustment.

  • Page 52: Lm335 Sensor

    C H A P T E R = C1 + ( C2 * T - where C1 and C2 are the constants stored by the user in the LDT-5525 Temperature Controller for the AD590. The AD590 measurement is calibrated, at the factory, with C2 = 1 and C1 = 0 (nominal values).
  • Page 53 C H A P T E R The LDT-5525 Temperature Controller uses v to determine the nominal temperature, T , by the formula: = ( v / ( 10mV / K ) ) - 273.15 - where T is in The temperature, T , which is displayed by the LDT-5525 Temperature Controller, is first calibrated as follows:...

  • Page 54: One Point Calibration Method

    C H A P T E R One Point Calibration Method This procedure will work for any linear temperature sensor. The accuracy of this procedure depends on the accuracy of the known temperature, externally measured. It is used to determine the zero offset of the device, and it assumes that the gain offset (slope) is known and is correct.
  • Page 55 C H A P T E R V = (T ) / (T ), and U = T - (T * V) Then C1 and C2 can be determined by the following: = U + (V * C1) and C2 = V * C2 Replace C1 with C1 by selecting the C1 parameter and entering the new C1...
  • Page 56 C H A P T E R LDT-5525...

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