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

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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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Contents User’s Guide Page Table of Contents Appendix a Steinhart-Hart Equation Appendix C AD590 and LM335 Sensor Calibration Iv LDT-5525 List of Figures Vi LDT-5525 General Safety Considerations Safety Information and the ManualSafety Marking Symbols Safety SymbolsWarranty Claims for Shipping Damage When you contact us, please have the following information Comments, Suggestions, and ProblemsXii LDT-5525 Product Overview Introduction and SpecificationsDescription Model Number Available Options and AccessoriesOutput1 SpecificationsUser Calibration General Specifications LDT-5525 AC Power Considerations OperationRack Mounting Introduction to the LDT-5525 Front Panel Power-Up SequenceAdjustments Sensor CAL Output Back Panel Controls and Connections Sensor Select SwitchBack Panel TEC Connector TEC ConnectorTEC Grounding Considerations General Operating Procedures Temperature Mode OperationWarm-Up and Environmental Considerations External Safety Switch Operation Resistance Mode OperationBooster Operation General Operating Procedures LDT-5525 Calibration Overview Maintenance and TroubleshootingRecommended Equipment Environmental ConditionsWarm Up Thermistor Calibration Calibration AdjustmentsAD590 Sensor Calibration LM335 Sensor Calibration ITE Current Calibration Symptom Causes and Corrective Actions TroubleshootingTemperature, based on C1 and C2 Table A.1 Comparison of Curve Fitting Equations STEINHART-HART EquationThermistor R/T Curves Computer Program REM Print Using H$ I, TI, RI LDT-5525 Thermistor Range Sensing Current Thermistor SelectionTable B.2 10K Thermistor Temperature Range Temperature Resolution Selecting and Using ThermistorsSelecting the Sensing Current Thermistor Range AD590 Sensor AD590 and LM335 Sensor CalibrationFigure C.1 AD590 Nonlinearity LM335 Sensor0607 Two Point Calibration Method One Point Calibration MethodC1n = U + V * C1 and C2n = V * C2 LDT-5525
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