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Manual Lightwave Communications LDT-5525

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  • Lightwave Communications LDT-5525 - page 1

    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 .ilxlightwave.com 70019904_07_01 ...

  • Lightwave Communications LDT-5525 - page 2

    ...

  • Lightwave Communications LDT-5525 - page 3

    T ABLE OF CONTENTS 06_07 LDT -5525 i                    T ABLE OF C ONTENTS Safety Information and the Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .vii General Safety Considerat ions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii Safety ...

  • Lightwave Communications LDT-5525 - page 4

    T ABLE OF CONTENTS ii LDT -5525  SENSOR SELECT Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 TEC Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 TEC Grounding Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Gen ...

  • Lightwave Communications LDT-5525 - page 5

    T ABLE OF CONTENTS 06_07 LDT -5525 iii  Appendix C AD590 and LM 335 Sensor Calibration AD590 Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 LM335 Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 One Point Calibration Method . . . . . . ...

  • Lightwave Communications LDT-5525 - page 6

    T ABLE OF CONTENTS iv LDT -5525  ...

  • Lightwave Communications LDT-5525 - page 7

    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 . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Figure 2.3 Back Panel TEC Conne ctor . . . ...

  • Lightwave Communications LDT-5525 - page 8

    LIST OF FIGURES vi LDT -5525  ...

  • Lightwave Communications LDT-5525 - page 9

    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 Information and the Manual Throughout this manual, you w ...

  • Lightwave Communications LDT-5525 - page 10

    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. The following clas sification s are standard acr ...

  • Lightwave Communications LDT-5525 - page 11

    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. Limitations This warranty does not apply to fuses, ...

  • Lightwave Communications LDT-5525 - page 12

    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 . Y ou must negotiate and settle with the carr ...

  • Lightwave Communications LDT-5525 - page 13

    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. Y ou may cont act us in whatever way is mo st conveni ent: Phone . . . . . . . . . . ...

  • Lightwave Communications LDT-5525 - page 14

    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! ...

  • Lightwave Communications LDT-5525 - page 15

    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. Product Overview The LDT ...

  • Lightwave Communications LDT-5525 - page 16

    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. DESCRIPT ...

  • Lightwave Communications LDT-5525 - page 17

    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 . Contact ILX Lightwave for further information 3 Broadband noise (10 Hz to 10 MHz) is measured a t 1 Amp output current 4 T emp ...

  • Lightwave Communications LDT-5525 - page 18

    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 and are dependent on the user-define d configuration of the instr ument; variation from typical value is largely due to uncertainty in thermistor cali ...

  • Lightwave Communications LDT-5525 - page 19

    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. General Output Connectors TEC I/O: 15-pi ...

  • Lightwave Communications LDT-5525 - page 20

    INTRODUCTION AND SPECIFICATIONS Specifications 6 LDT -5525 CHAPTER 1  ...

  • Lightwave Communications LDT-5525 - page 21

    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. This chapter also give ...

  • Lightwave Communications LDT-5525 - page 22

    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. During the power-up sequence, the following t akes place. For abo ut two sec ...

  • Lightwave Communications LDT-5525 - page 23

    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. Pressing the ENBL switch toggles the ENBL indicator on ...

  • Lightwave Communications LDT-5525 - page 24

    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. The GAIN value is used to co ntrol the sensor feedback gain , and thus the temperature settl ...

  • Lightwave Communications LDT-5525 - page 25

    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. Since these devices are used ove r their linear range, the constant s C1 and C2 are used in this ca se to determine a linear approximation of the temperature, rather ...

  • Lightwave Communications LDT-5525 - page 26

    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. For example, an analog output signal o f 2.5 volts ( + 0.5 volt s) w ...

  • Lightwave Communications LDT-5525 - page 27

    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. When using a thermistor , the supply current depends on the thermistor operating temp erature range and the required temp ...

  • Lightwave Communications LDT-5525 - page 28

    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. Note: For the TEC connector , if any one terminal pin is grounded, then no other terminal pin should be g ...

  • Lightwave Communications LDT-5525 - page 29

    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. Warm-Up and Environmental Considerations Operate the LDT -5525 T emperature Controller at an ambient temp erature in the range of 0 to +40° ...

  • Lightwave Communications LDT-5525 - page 30

    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 ). This example is for const ant resistance (R) mode. a Plug the LDT - 552 5 T emperature Con ...

  • Lightwave Communications LDT-5525 - page 31

    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. It is lef t as an option which the user may or may not employ . Booster Operation The LDT -5525 T emperature Controller may be used to control a booster current source which ac ...

  • Lightwave Communications LDT-5525 - page 32

    OPERATION General Operating Procedures 18 LDT -5525 CHAPTER 2  ...

  • Lightwave Communications LDT-5525 - page 33

    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. THE SERVICE PROCEDURES DESCRIBED IN THI ...

  • Lightwave Communications LDT-5525 - page 34

    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. T able 3.1 Environmental Condit ...

  • Lightwave Communications LDT-5525 - page 35

    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. If a problem aris ...

  • Lightwave Communications LDT-5525 - page 36

    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. This procedure calibrates the current measurement of the AD590. This procedure does not calibrate ...

  • Lightwave Communications LDT-5525 - page 37

    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. This procedure calibrates the voltage measurement of the LM335. This procedure does not cali ...

  • Lightwave Communications LDT-5525 - page 38

    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. When each of these value s is reached and is s ...

  • Lightwave Communications LDT-5525 - page 39

    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. W e recommend that the user start at the beginning of this gu ...

  • Lightwave Communications LDT-5525 - page 40

    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 Check the MODE or DISPLA Y switch ; if they do not respo nd, the unit may be in measurement calibration mo de (see Cha pter 3); press the OUTPUT swit ...

  • Lightwave Communications LDT-5525 - page 41

    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. 1. It has been foun ...

  • Lightwave Communications LDT-5525 - page 42

    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 0.3 o C over the range - ...

  • Lightwave Communications LDT-5525 - page 43

    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. ...

  • Lightwave Communications LDT-5525 - page 44

    30 LDT -5525 CHAPTER A  80 REM * * * * * * * * * * * * * * STEIN1 * * * * * * * * * * * * * * * 90 REM 92 REM Rev: 3 11 87 94 REM T is expressed in Kelvins. 100 REM Least squares fit program to find the thermistor coefficients 110 REM C1 and C2 in the following equation: 120 REM 130 REM 1/T = C1 + C2 * (ln R) 140 REM 200 REM 210 REM Variables: 2 ...

  • Lightwave Communications LDT-5525 - page 45

    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 : SXY=0 : SXX=0 1210 FOR I = 1 TO N 1220 SX=SX+X(I) 1230 SY=SY+Y(I) 1240 SXY=SXY+X(I)*Y(I) 1250 SXX=SXX+X(I)*X(I) 1260 NEXT I 1300 REM **** print out ...

  • Lightwave Communications LDT-5525 - page 46

    32 LDT -5525 CHAPTER A  ...

  • Lightwave Communications LDT-5525 - page 47

    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. T o correctly set the SENSOR SELECT switch ...

  • Lightwave Communications LDT-5525 - page 48

    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 . (A 10 K thermistor has a resistance of 10 k Ω at 2 ...

  • Lightwave Communications LDT-5525 - page 49

    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. A temperature change of one degree cent igrade will be ...

  • Lightwave Communications LDT-5525 - page 50

    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. If you require a dif fe ...

  • Lightwave Communications LDT-5525 - page 51

    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. C1 is used as the linear or zero of fset va lue, and C2 is ...

  • Lightwave Communications LDT-5525 - page 52

    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). The AD590 gra des of tolerance vary , but typically this means that without adjusting C1 o ...

  • Lightwave Communications LDT-5525 - page 53

    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 ) ) - 273.15 - where T n is in o C. The temperature, T d , which is displayed by the LDT -5525 T emperature Controller , is first calibrated as follows: T d = C1 + ( C2 * T n ) - where C1 a ...

  • Lightwave Communications LDT-5525 - page 54

    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. 1 A ...

  • Lightwave Communications LDT-5525 - page 55

    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. Replace C2 with C2 n by selecting the C2 parameter and entering the new C2 ...

  • Lightwave Communications LDT-5525 - page 56

    42 LDT -5525 CHAPTER C  ...

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