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Lightwave Communications LDT-5525 manual Maintenance And Troubleshooting, Calibration Overview

Models: LDT-5525

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MAINTENANCE AND TROUBLESHOOTING

C H A P T E R 3

MAINTENANCE AND TROUBLESHOOTING

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. POTENTIALLY LETHAL VOLTAGES EXIST WITHIN THE LDT 5525 TEMPERATURE CONTROLLER. TO AVOID ELECTRIC SHOCK, DO NOT PERFORM ANY OF THE PROCEDURES DESCRIBED IN THIS CHAPTER UNLESS YOU ARE QUALIFIED TO DO SO.

QUALIFIED SERVICE PERSONNEL ARE REQUIRED TO WEAR PROTECTIVE

EYEGLASSES AND ANTI-STATIC WRIST BANDS WHILE WORKING ON THE LDT-5525

TEMPERATURE CONTROLLER CIRCUIT BOARDS.

HIGH VOLTAGES ARE PRESENT ON AND AROUND THE PRINTED CIRCUIT BOARDS OF

THE LDT-5525 TEMPERATURE CONTROLLER.

Calibration Overview

The LDT-5525 Temperature Controller should be calibrated every 12 months or whenever performance verification indicates that calibration is necessary.

All calibrations can be done with the case closed. The instrument is calibrated by changing the internally stored digital calibration constants.

LDT-5525 19

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Lightwave Communications LDT-5525 manual Maintenance And Troubleshooting, Calibration Overview, C H A P T E R

Contents

Temperature Controller LDT-5525 User’s Guide700199040701 Page TABLE OF CONTENTS Chapter 1 Introduction and SpecificationsChapter 2 Operation Chapter 3 Maintenance and Troubleshooting Appendix A Steinhart-Hart EquationAppendix B Sensing Current and Thermistor Selection TABLE OF CONTENTS Appendix C AD590 and LM335 Sensor CalibrationAD590 Sensor LM335 Sensor One Point Calibration Method Two Point Calibration Methodiv LDT-5525 TABLE OF CONTENTSLIST OF FIGURES LIST OF FIGURESvi LDT-5525 LIST OF FIGURESSAFETY AND WARRANTY INFORMATION Safety Information and the ManualGeneral Safety Considerations Safety Marking Symbols SAFETY SYMBOLSWARRANTY LimitationsReturning an Instrument Claims for Shipping Damage WA R R A N T Yx LDT-5525 Comments, Suggestions, and Problems We look forward to serving you even better in the future WA R R A N T Yxii LDT-5525 INTRODUCTION AND SPECIFICATIONS Product OverviewC H A P T E R INTR ODUCTION AND SP ECIFI CATIONS Available Options and AccessoriesSpecifications Temperature ControlOutput1 Measurement Display User CalibrationGeneral INTR ODUCTION AND SP ECIFI CATIONS Specifications6 LDT-5525 C H A P T E ROPERATION AC Power ConsiderationsRack Mounting C H A P T E RPower-Up Sequence Introduction to the LDT-5525 Front PanelFigure 2.1 LDT-5525 Front Panel Adjustments DisplayParameters SENSOR CAL Parameter SetupControl Mode Error IndicatorsOutput SENSOR SELECT Switch Back Panel Controls and ConnectionsAnalog Output Table 2.1 SENSOR SELECT Switch Positions TEC ConnectorO P E R A T I O N TEC Grounding ConsiderationsBack Panel Controls and Connections 14 LDT-5525General Operating Procedures Temperature Mode OperationWarm-Up and Environmental Considerations External Safety Switch Operation Resistance Mode OperationBooster Operation O P E R A T I O N General Operating Procedures18 LDT-5525 C H A P T E RMAINTENANCE AND TROUBLESHOOTING Calibration OverviewC H A P T E R Environmental Conditions Recommended EquipmentWarm Up SPECIFICATIONThermistor Calibration Calibration AdjustmentsAD590 Sensor Calibration LM335 Sensor Calibration ITE Current Calibration Troubleshooting SymptomCauses and Corrective Actions Unable to adjust output or A P P E N D I X A STEINHART-HART EQUATION1/T = A + B * ln R Equation Computer Program 30 LDT-5525 LDT-5525 C H A P T E R A 32 LDT-5525SENSING CURRENT AND THERMISTOR SELECTION Thermistor RangeA P P E N D I X B Table B.2 10K Thermistor Temperature Range TEMPERATURE RANGESENSING CURRENT Selecting and Using Thermistors Temperature ResolutionSelecting the Sensing Current Table B.3 10K Thermistor Voltage vs. Resolutiongenerally a good choice for most laser diode applications where high stability is required near room temperatures. Similarly, 10 K thermistors are often a good choice for detector cooling applications where you want to operate at temperatures from -30 oC to room temperature AD590 AND LM335 SENSOR CALIBRATION AD590 SensorA P P E N D I X C LM335 Sensor Tn = v / 10mV / K - 273.15 - where Tn is in oC One Point Calibration Method Two Point Calibration Method40 LDT-5525 LDT-5525 C1n = U + V * C1 and C2n = V * C2C H A P T E R C 42 LDT-5525