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User’ s Guide T emperature Controller LDT -5525 ILX Lightwa ve Corporation · P . O . Box 6310 · Boz eman, MT , U .S.A. 59771 · U .S. & Canada: 1-800-459-9459 · International Inquir ies : 406-556-2481 · F ax 406-586-9405 ilx.custhelp.com · www .
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T ABLE OF CONTENTS 06_07 LDT -5525 i T ABLE OF C ONTENTS Safety Information and the Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .vii General Safety Considerat ions .
T ABLE OF CONTENTS ii LDT -5525 SENSOR SELECT Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 TEC Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 TEC Grounding Considerations .
T ABLE OF CONTENTS 06_07 LDT -5525 iii Appendix C AD590 and LM 335 Sensor Calibration AD590 Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 LM335 Sensor . . . . . . . . . . . . . . . . . . . .
T ABLE OF CONTENTS iv LDT -5525 .
LIST OF FIGURES 06_07 LDT -5525 v L IST OF F IGURES Figure 2.1 LDT-5525 Fro nt Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Figure 2.2 LDT-5525 Back Pan el .
LIST OF FIGURES vi LDT -5525 .
LDT -5525 vii S AFETY AND W ARRANTY I NFORMATION The Safety and W arranty Information section provides details about cautio nary symbols used in the manual, safety markings used on th e instrument, and information about the W arranty including Customer Service contact informa tion.
SAFETY SYMBOLS viii LDT -5525 S AFETY S YMBOLS This section describes the safe ty symbols and classifications. T echnical specifications including electric al ratings and weight are included within the manual. See the T able of Contents to loca te the specifications and other product information.
WA R R AN T Y 06_07 LDT -5525 ix W ARRANTY ILX LIGHTW A VE CORPORA TION warrants th is instrument to be free from defects in materia l and workmanship for a period of one year from date of shipment. During the warranty period, ILX will repa ir or replace the unit, at our option, without charge.
WA R R AN T Y x LDT -5525 Claims for Shipping Damage When you receive the instrument, inspect it immedia tely for any damage or shortages on the p acking list. If the instrument is damaged , file a claim with the carrier . The factory will supply you with a quot ation for estimated cost s of repair .
WA R R AN T Y 06_07 LDT -5525 xi Comments, Suggestio ns, and Problems T o ensure that you get the most out of your ILX Lightwave product, we ask that you direct any product operation or servic e related questions or comment s to ILX Lightwave Customer Support.
WA R R AN T Y xii LDT -5525 in a container with at least 3 in ches (7 .5 cm) of compressible packa ging material on all sides. We loo k forward to serving you even better in the fut ure!.
LDT -5525 1 CHAPT ER 1 I NTRODUCTION AND S PECIFICATIONS This manual conta ins operation and main tenance inf ormation for the LDT 5525 T emperature Controller . If you want to get started right awa y , read Chapter 2, which covers Operation, first.
INTRODUCTION AND SPECIFICATIONS Product Overview 2 LDT -5525 CHAPTER 1 Available Options and Accessories Options and accessories available for the LDT -5525 T emperature Controlle r include the following: Other Laser Diode Mounts a re available. Please cont act ILX Lightwave for information on additional o ptions for your applications.
INTRODUCTION AND SPECIFICATIONS Specifications 06_07 LDT -5525 3 CHAPTER 1 Specifications 1 Output current and power are rated into a 1 ohm load 2 Higher output powers can be accommodated by using an extern al booster .
INTRODUCTION AND SPECIFICATIONS Specifications 4 LDT -5525 CHAPTER 1 6 Accuracy figures quoted are typical for a calibrated 10K ther mistor; accuracy figures are relative to calibr ation standard .
INTRODUCTION AND SPECIFICATIONS Specifications 06_07 LDT -5525 5 CHAPTER 1 Our goal is to make the best laser diode instrument ation available anywhere. T o achieve this, we need your ideas and co mment s on ways we can improve out products. We invite you to cont act us at any time with your suggestions.
INTRODUCTION AND SPECIFICATIONS Specifications 6 LDT -5525 CHAPTER 1 .
LDT -5525 7 CHAPTE R 2 O PERATION This chapter describes how to inst all, adju st, and operate the LDT -5525 T emperature Controller . It is divided into sections covering installation, familiarization and adjustment, and normal operating procedu res.
OPERATION Po w e r- U p S e qu e n c e 8 LDT -5525 CHAPTER 2 Power-Up Sequence With the LDT -5525 Series Precision T emperature Controller connecte d to an AC power source, pressing the POW ER switch will supply power to the instrument and start th e power up sequence.
OPERATION Introduction to the LDT -5525 F ront P anel 06_07 LDT -5525 9 CHAPTER 2 Adjustment s The ADJUST section cont ains the Adjust kn ob for entering values, and it cont ains the ENBL (adjust enable) switch and indicator . In order to make any adjustment, the ENBL indicator must be lit.
OPERATION Introduction to the LDT -5525 F ron t P ane l 10 LDT -5525 CHAPTER 2 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.
OPERATION Introduction to the LDT -5525 F ront P anel 06_07 LDT -5525 11 CHAPTER 2 Appendix C contains informatio n on sens or calibration const ant s for AD590 and LM335 sensors.
OPERATION Back P anel Controls and Connections 12 LDT -5525 CHAPTER 2 Analog Output An analog output signal is a vailable at the ANALOG OUTPUT connector (BNC) on the front p anel. This signal is a volt age between 0 - 5.0 volt s which is proportional to the measurement signal.
OPERATION Back P anel Controls and Connections 06_07 LDT -5525 13 CHAPTER 2 T able 2.1 SENSOR SELECT Switch Positions The 10 µ A and 100 µ A designations are for the current source level; thermistor sensor type is implied.
OPERATION Back P anel Controls and Connections 14 LDT -5525 CHAPTER 2 TEC Grounding Considerations The TEC outputs of the LDT -5525 are isolated from chassis ground, allowing either output terminal to be gro unded at the user's option.
OPERATION General Operatin g Procedures 06_07 LDT -5525 15 CHAPTER 2 General Operating Procedures The following sections present some guide lines for operation, as well as some common operating procedures.
OPERATION General Operating Procedures 16 LDT -5525 CHAPTER 2 Resistance Mode Operation Y ou can operate the LDT -5525 T emperature Controller in several modes, const ant current (I TE), const ant thermistor resist ance (R), or const ant temperature (T ).
OPERATION General Operatin g Procedures 06_07 LDT -5525 17 CHAPTER 2 an external current booster . A switch or control circuit of the user's own design is required.
OPERATION General Operating Procedures 18 LDT -5525 CHAPTER 2 .
LDT -5525 19 CHAPTE R 3 M AINTENANCE AND T ROUBLESHOOTING This chapter describes how to ma intain and troubleshoot the LDT -5525 T emperature Controller . Included are sect ions covering calibration, disassembly , and troubleshooting.
MAINTENANCE AND TROUBLESHOOTING Calibration Over view 20 LDT -5525 CHAPTER 3 Recommended Equipment Recommended test equipment for calibrating the L DT -5525 T emperature Controller is listed in T able 3.1. Equipment other than that shown in the table may be used if the specif ications meet or exceed those listed.
MAINTENANCE AND TROUBLESHOOTING Calibratio n Adjus tments 06_07 LDT -5525 21 CHAPTER 3 Calibration Adjustments There are two calibration adjustment s that need to be made for the LDT -5525 T emperature Controller . They are cali bration of sensor measurement, and calibration of the ITE current measu rement and limit circuit s.
MAINTENANCE AND TROUBLESHOOTING Calibration A djustme nts 22 LDT -5525 CHAPTER 3 AD590 Sensor Calibration The following procedure is for ca librating the AD590 sen sor measurement so that the temperature measurement will be as accurate as possible.
MAINTENANCE AND TROUBLESHOOTING Calibratio n Adjus tments 06_07 LDT -5525 23 CHAPTER 3 LM335 Sensor Calibration The following procedure is for ca librating the LM335 sensor measurement so that the temperature measurement will be as accurate as possible.
MAINTENANCE AND TROUBLESHOOTING Calibration A djustme nts 24 LDT -5525 CHAPTER 3 ITE Current Calibration The following procedure is for calibrating the ITE const ant current source for both polarities of current. During this proced ure the ITE current is driven to a series of pre-determined values.
MAINTENANCE AND TROUBLESHOOTING T roubleshooting 06_07 LDT -5525 25 CHAPTER 3 Troubleshooting This section is a guide to troubleshooti ng the LDT -5525 T emperature Controller . Some of the more common symptoms are liste d here, and the appropriat e troubleshooting actions are given.
MAINTENANCE AND TROUBLESHOOTING T roubleshooting 26 LDT -5525 CHAPTER 3 Unable to adjust output or parameter Check the ADJUST ENBL switch; th e indicator must be lit for any adjustments to be made.
LDT -5525 27 APPENDIX A S TEINHART -H ART E QUATION T wo-terminal thermistors have a nonlinear relationship bet ween temperature and resistance. The resist ance verses temperat ure characteristics for a family of similar thermistors is shown in Figure A.
28 LDT -5525 CHAPTER A For the LDT -5525, the S teinhart 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 provid es adequate result s. T able A.1 also shows that the use of Equation 2 introduc es temperatu re errors of less than 0.
06_07 LDT -5525 29 CHAPTER A Computer Program We have in cluded a computer program called STEIN1 that uses a lea st squares curve fitting routine to dete rmine the values of C1 a nd C2. The program is written in IBM's advanced BASICA. Y ou must create a dat a file for yo ur thermistor that describes the resist ance at various temperatures.
30 LDT -5525 CHAPTER A 80 REM * * * * * * * * * * * * * * STEIN1 * * * * * * * * * * * * * * * 90 REM 92 REM Rev: 3 11 87 94 REM T is expressed in Kelvins.
06_07 LDT -5525 31 CHAPTER A 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 .
32 LDT -5525 CHAPTER A .
LDT -5525 33 APPENDIX B S ENSING C URRENT AND T HERMISTOR S ELECTION Choosing the right sen sing current depends on the range o f temperature you want to measure and the resolution you require at the highest measured temp erature.
Thermistor Range 34 LDT -5525 CHAPTER B thermistor inputs o f the LDT -5525. The LDT -5525's measurement system will over-range when the input volt age exce eds about 4.5 volt s. Figure B.1 graphically shows the lower temperature a nd upper volt age limits for a typical 10 K thermistor .
Thermistor R ange 06_07 LDT -5525 35 CHAPTER B Temperature Resolution Y ou must also consider measur emen t resolution since the measureme nt resolution decreases as the the rmistor temperature increases. A temperature controller (such as the LDT -5525) has a limited measurement resolution.
Thermistor Range 36 LDT -5525 CHAPTER B generally a good choice for most laser d i ode applications where high sta bility is required near room temperatures. Similarly , 10 K thermistors are of ten a good choice for detector cooling application s where you want to operate at temperatures from -30 o C to room temperature.
LDT -5525 37 APPENDIX C AD590 AND LM335 S ENSOR C ALIBRATION The LDT -5525 T emperature Controller uses two constant s (C1 and C2) f or calibrating linear thermal sen sing devices, such as the AD590, a nd the LM335.
38 LDT -5525 CHAPTER C T d = C1 + ( C2 * T n ) - where C1 and C2 are the const ant s stored by the user in the LDT -5525 T emperature Controller for the AD590. The AD590 measurement is calibrat ed, at the factory , with C2 = 1 and C1 = 0 (nominal values).
06_07 LDT -5525 39 CHAPTER C The LDT -5525 T emperature Controller uses v to determine the nominal temperature, T n , by the formula: T n = ( v / ( 10mV / K ) ) - 273.
40 LDT -5525 CHAPTER C One Point Calibration Method This procedure will work for any linear te mperature sensor . The accuracy of this procedure depends on the accuracy of the known temperature, externally measured. It is used to dete rmine the zero of fset of the device, and it assumes that the gain of fset (slope) is known and is correct.
06_07 LDT -5525 41 CHAPTER C V = (T a1 - T a2 ) / (T d1 - T d2 ), and U = T a1 - (T d1 * V) Then C1 n and C2 n can be determined by th e following: C1 n = U + (V * C1) and C2 n = V * C2 6 Replace C1 with C1 n by selecting the C1 parameter and entering the new C1 n value.
42 LDT -5525 CHAPTER C .
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