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ILX Lightwave LDT-5500B Series User Manual Download Page 59

LDT-5500B Series

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A P P E N D I X  

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S

TEINHART

-H

ART

 E

QUATION

This appendix is the ILX Lightwave Application Note “Thermistor Calibration and 
the Steinhart-Hart Equation”.

Summary of Contents for LDT-5500B Series

Page 1: ...roller LDT 5500B Series 70019907 May 2011 ILX Lightwave Corporation 31950 Frontage Road Bozeman MT U S A 59715 U S Canada 1 800 459 9459 International Inquiries 406 556 2481 Fax 406 586 9405 ilx custh...

Page 2: ......

Page 3: ...apter 1 Introduction and Specifications Product Overview 1 Available Options and Accessories 2 Specifications 3 Chapter 2 Operation AC Power Considerations 7 Rack Mounting 7 Power Up Sequence 8 USB 8...

Page 4: ...ration USB Driver Installation 17 Command Syntax 18 Letters 18 White Space 18 Command Termination 18 Boolean Parameter Values 18 Command Timing and Completion 18 Error Messages 19 Chapter 4 Command Re...

Page 5: ...ation 42 Troubleshooting 43 Appendix A Steinhart Hart Equation Appendix B Sensing Current and Thermistor Selection Thermistor Range 47 Temperature Resolution 49 Selecting the Sensing Current 49 Select...

Page 6: ...TA B L E O F C O N T E N T S iv LDT 5500B Series...

Page 7: ...T 5500B Series v LIST OF FIGURES Figure 2 1 LDT 5500B Series Front Panel 9 Figure 2 2 LDT 5500B Series Back Panel 13 Figure 2 3 Back Panel TEC Connector 14 Figure B 1 Thermistor Temperature Range 48 F...

Page 8: ...L I S T O F FIG U R E S vi LDT 5500B Series...

Page 9: ...tially dangerous situation which can result in serious injury or death WARNING Visible and or invisible laser radiation Avoid direct exposure to the beam General Safety Considerations If any of the fo...

Page 10: ...m Relative Humidity 80 RH non condensing Operating temperature range of 0 C to 40 C Storage and transportation temperature of 40 C to 70 C Maximum altitude 3000 m 9843 ft This equipment is suitable fo...

Page 11: ...turn Authorization number RA from ILX Customer Service 2 Attach a tag to the instrument identifying the owner and indicating the required service or repair Include the instrument serial number from th...

Page 12: ...trument inspect it immediately for any damage or shortages on the packing list If the instrument is damaged file a claim with the carrier The factory will supply you with a quotation for estimated cos...

Page 13: ...Montana U S A 59771 www ilxlightwave com When you contact us please have the following information If ILX Lightwave determines that a return to the factory is necessary you are issued a Return Authori...

Page 14: ...WA R R A N T Y xii LDT 5500B Series in a container with at least 3 inches 7 5 cm of compressible packaging material on all sides We look forward to serving you even better in the future...

Page 15: ...tability with the versatility of a microprocessor based instrument The internal microprocessor controls the operation of the LDT 5500B Series and performs the non linear conversion of thermistor resis...

Page 16: ...ion of two LDT 5500B Series instruments into a standard 19 rack RM 135 Temperature Controlled Laser Diode Mount LDM 4405 Temperature Controlled Laser Diode Mount LDM 4407 High Power Laser Diode Mount...

Page 17: ...Bipolar current source Control Algorithm Smart Integrator Hybrid PI Compliance Voltage 6V DC 4A LDT 5525B 10V DC 5A LDT 5545B Maximum Output Current 4 0A LDT 5525B 5 0A LDT 5545B Maximum Output Power...

Page 18: ...99 9 o C Temperature Resolution 10 A thermistor 0 1o C 100 A thermistor 0 1o C AD590 0 1o C LM335 0 1o C Accuracy3 0 5o C typical Thermistor Resistance Range 10 A thermistor 2 0 450 k 100 A thermistor...

Page 19: ...to 10 MHz 7 With use of optional TSC 599 Temperature Sensor Converter 8 0 to 5V representing measured temperature Our goal is to make the best laser diode instrumentation available anywhere To achiev...

Page 20: ...I N T R O D U C T I O N A N D S P E C I F I C A T I O N S Specifications 6 LDT 5500B Series C H A P T E R 1...

Page 21: ...ges of 100 120 and 230 VAC 10 This is done at the factory and need not be changed before operating the instrument However check to be sure that the voltage indicated on the back panel of the instrumen...

Page 22: ...ayed on the front panel first version number displayed is mainboard the second is the front panel After this the sensor positions is displayed for two seconds After the power up sequence the unit is c...

Page 23: ...Series Front Panel Adjustments The adjustment knob is used for entering values and can be disabled using the ENABLE adjust enable button and indicator In order to make any adjustment the ENABLE indic...

Page 24: ...ited via the sensor feedback to the LIM T value If the sensor reads a temperature which is greater than LIM T the output will be disabled The GAIN value is used to control the sensor feedback gain and...

Page 25: ...d LM335 temperature conversions When a linear sensor device such as an AD590 or LM335 is used a linear equation is used If a linear sensor s calibration is not known set C1 0 00 C2 1 00 For more infor...

Page 26: ...output is on When a TE OPEN condition occurs the output will be shut off and the indicator will remain on until the problem is resolved and the output is turned on again The T LIMIT light remains lit...

Page 27: ...including the external fuses in the AC power entry module SENSOR SELECT Switch The SENSOR SELECT switch is used to select sensor type and in the case of thermistor sensor the source current level Tabl...

Page 28: ...these sensors see Appendix C TEC Connector In the lower right hand corner when facing the back panel you will find the 15 pin D connector for the TEC MODULE This connector is used for the input and o...

Page 29: ...LDT 5500B Series Temperature Controller The OUTPUT stage will be disabled at power up and the unit will automatically configure its parameters to the state which existed when the power was last shut o...

Page 30: ...the setting of the SENSOR SELECT switch for the desired operation 10 A or 100 A The sensor code will be displayed for two seconds during the power up sequence e Press the parameter SELECT switch and...

Page 31: ...ect the instrument to a PC and is included in the shipping kit Once connected the ILX Virtual COM Port driver provides a simple programmable interface to the USB port The LDT 5500B USB Front Panel sof...

Page 32: ...query must contain all of the letters of the command The LDT 5500B does not distinguish between capital and lower case letters White Space Spaces or white space may be used to separate data but may n...

Page 33: ...ch as TEMPERATURE LIMIT SENSOR OPEN TE CURRENT LIMIT and TE OPEN An error query is available to indicate that the output has turned off due to an output short condition or low resistive load A respons...

Page 34: ...RE M O T E O PE R A T I ON Error Messages 20 LDT 5500B Series C H A P T E R 3...

Page 35: ...identification string RST NONE Used to reset the mode and set point values to factory default values CURRENT_LIMIT NONE Used to return the status of the ITE limit error FET_OVER_POWER NONE Used to ret...

Page 36: ...resistance mode TEC MODE T NONE Sets the TEC mode to constant temperature mode TEC MODE NONE Returns the mode ITE TEC current R sensor or T TEC OUT 1 Used to enable disable the TEC current output TEC...

Page 37: ...labeled Set in the TEC DISPLAY area of the front panel Parameters Requests the instrument to identify itself Notes Returns a comma delimited standard format ASCII identification string from informatio...

Page 38: ...o occur if the resistance of the load is less than 1 Examples FET_OVER_POWER response 0 means that the output was not disabled due to a shorting or low resistive load FET_OVER_POWER response 1 means t...

Page 39: ...99 Notes When the LM335 or AD590 sensors are selected via the SENSOR SELECT switch only C1 and C2 are used Examples TEC C1 1 125 action sets the Steinhart Hart constant C1 for the current selected se...

Page 40: ...to 2 100 The TEC CAL ITE command is used to enter into remote TEC current user calibration mode Parameters None Notes Calibration mode can be disabled by sending the output on command or pressing the...

Page 41: ...a gain value which does not equal 1 3 10 30 100 or 300 the instrument will ignore the command Examples TEC GAIN 10 action sets the TEC control loop gain to 10 TEC GAIN response 300 means the TEC contr...

Page 42: ...ture limit set point value Parameters A value which represents the upper bound of the load temperature in o C Notes The temperature limit value must be in the range 99 9 o C to 199 9 o C This value al...

Page 43: ...causes the output to be forced off and the new mode s set point value will be displayed Examples TEC MODE R action sets the TEC controller for constant thermistor resistance reference operating mode...

Page 44: ...e performing further operations but it is not necessary Examples TEC OUT enables the TEC output to control the thermal load connected respective of the mode TEC OUT response 1 means that the TEC outpu...

Page 45: ...NSOR SELECT switch is in the 100 A thermistor position The TEC SET ITE query returns the constant TE current set point value Parameters None Notes The TEC output is controlled to this set point value...

Page 46: ...ure is 29 2 o C The TEMP_LIMIT query returns the current status of the temperature limit error Parameters None Notes This error is always updated This means if the output was disabled because of a tem...

Page 47: ...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 5500B Series TE...

Page 48: ...sary however the LDT 5500B Series Temperature Controller may be calibrated at its intended use temperature if this is within the specified operating temperature range of 0 to 40oC Warm Up The LDT 5500...

Page 49: ...rd the exact resistance of your 4 k 40 k and 400 k metal film resistors A 4 point probe resistance measurement is recommended c Connect the 4 k for 100 A or 40k for 10 A metal film resistor to the sen...

Page 50: ...rement to settle for about three seconds e Send the command TEC R VALUE where VALUE indicates the resistance in K measured in Step b for the 4 k resistor f Wait for the 7 segment display to flash off...

Page 51: ...and parameter SET buttons at the same time After this the TEC display will indicate sensor reference current in A Wait for three seconds for the measurement to settle The k enunciator is used to indi...

Page 52: ...onds for the measurement to settle d Send the command TEC R VALUE where VALUE indicates in A the current measured by the precision ammeter e Wait for the 7 segment display to flash off and then back o...

Page 53: ...ay will indicate sensor reference voltage in 100 s of mV Wait for three seconds for the measurement to settle The k enunciator is used to indicate sensor calibration d Press and hold in the ENABLE but...

Page 54: ...mand TEC R VALUE where VALUE indicates the value measured by the precision voltmeter mutiplied by 10 For example if the voltage across the resistor is 1 9871 Volts send the command TEC R 19 87 e Wait...

Page 55: ...robe resistance measurement is recommended b Enter the calibration mode by pushing the display SELECT and mode SELECT buttons This will put the LDT 5500B Series into ITE calibration mode Wait for thre...

Page 56: ...splay will indicate ITE current in Amps c Remotely send the current value measured and calculated using Step a using the command TEC ITE VALUE d Wait three seconds to allow the ITE current to settle a...

Page 57: ...it check the sensor connections and then try again Check that the back panel SENSOR SWITCH position is set to the proper sensor type Check that the sensor s temperature calibration constants C1 C2 and...

Page 58: ...M A I N T E N A NC E A N D TR O U B L E S H O O T I N G Troubleshooting 44 LDT 5500B Series C H A P T E R 5...

Page 59: ...LDT 5500B Series 45 A P P E N D I X A STEINHART HART EQUATION This appendix is the ILX Lightwave Application Note Thermistor Calibration and the Steinhart Hart Equation...

Page 60: ...46 LDT 5500B Series C H A P T E R A...

Page 61: ...sistance changes less for an equivalent temperature change at lower temperatures the thermistor becomes less sensitive Consider the temperature and sensitivity figures in Table B 1 below for a 10 K th...

Page 62: ...istor to thermistor even though both thermistors are nominally 10 K This is due to manufacturing tolerances in the thermistor and is compensated for by determining C1 C2 and C3 calibrating the thermis...

Page 63: ...providing the maximum resolution of 0 1oC with the LDT 5500B Series Therefore the sensor current you choose may impact the temperature measurement resolution as well as the set point control accuracy...

Page 64: ...ng applications where you want to operate at temperatures from 30 oC to room temperature If you require a different temperature range or the accuracy you need can t be achieved with either switch sett...

Page 65: ...ts temperature is stable A highly accurate temperature probe thermometer environmental chamber etc may also be used to determine the known temperature for calibration This appendix contains one and tw...

Page 66: ...with C1 is assumed to be zero Figure C 1 AD590 Nonlinearity If a maximum absolute error of 0 8 oC is tolerable over the entire temperature range the one point calibration of C1 should be used see pag...

Page 67: ...so the temperature accuracy is typically 0 3 o C over the rated operating range The temperature accuracy may be improved over a narrow temperature range by a two point calibration of C1 and C2 However...

Page 68: ...od This procedure will work for any linear temperature sensor The accuracy of this procedure depends on the accuracy of the known temperatures externally measured It is used to determine the zero offs...

Page 69: ...2 and U Ta1 Td1 V Then C1n and C2n can be determined by the following C1n U V C1 and C2n V C2 6 Replace C1 with C1n by selecting the C1 parameter and entering the new C1n value Replace C2 with C2n by...

Page 70: ...56 LDT 5500B Series C H A P T E R C...

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