Lightwave Communications LDT-5525 manual Introduction and Specifications, Product Overview

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C H A P T E R 1

INTRODUCTION AND SPECIFICATIONS

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. The LDT 5525 can be used for laser diode testing, laser diode frequency stabilization, IR detector cooling, and to determine the characteristics of electronic devices. The LDT-5525 combines high analog stability with the versatility of a microprocessor-based instrument. The internal microprocessor controls the operation of the LDT-5525 and performs the non-linear conversion of thermistor resistance to temperature based on two user-defined constants.

You can configure the LDT-5525 to operate with a wide variety of thermistor temperature sensors and TE modules, as well as AD590 series and LM335 series temperature sensors.

Features of the LDT-5525 include:

Intuitive front panel layout

Large and easy-to-read green LED display

Display resolution of 0.1 degree Centigrade

Output current limit control to safely operate all TE coolers

Configurable for a variety of thermal sensors

Output will supply 4 amps, 24 Watts

Closed-case calibration

LDT-5525 1

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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