RMT Ltd.
Contents
1. 1 2 3 4 5 6 7 8 9 o are used only with DX6001 Controller REV 1 0 98 29 DX6006 RMT Ltd Format of First Calibration Data Block Address hex Description Format TE coolers Operating Temperature Ambient Temperature of Calibration Zero Value Polynomial Coefficient A3 Polynomial Coefficient A Polynomial Coefficient A Polynomial Coefficient Ag Formats of another reserved if applied Calibration Data Blocks are the same as the first one 30 REV 1 0 98 RMT Ltd DX6006 Identifier Data Format Identification Data is written as ASCI string It contains the following information IH Number Electronic Scheme Code Concentration Range In ppm Includes two significant digits of the concentration value followed by the number of zeros to follow Gas Code Part Number Example Gas Designator 6 positions max followed by space symbol CO2 6006 01 504 41 0012 CO2 6006 01 504 41 REV 1 0 98 CO2 DX6006 Series CO gt Gas Option 0 5 0 10 ppm 0 5 concentration range electronic scheme revision 4 10 31 DX6006 RMT Ltd Installation Tips It is required an external DC Power Supply with 5 V 5 and operating current not less than 7 5 mA Power Supply is to be connected to pin 2 It is used for supply of e pre amplifiers2. 4 5 4 Optical Mechanical Design 6 6 5 DimMensiONS sarei iinn avna 7 7 Gx CaliDratlonecnsts sinka nj ioni eh ea 8 9 7 Re Calibration 10 10 8 Zero Adjustments 11 11 9 Part Number Designations 12 12 10 Electronics Functional Diagram 13 17 Light rii onioni dre kann bolh najini kaka ena 18 19 Preamplifiers 20 22 Thermoelectric Coolers 23 25 TNErMISTOFSi aedereansccetevisscceasnanceateenvenccsenee 26 27 ON eo ki el ea been 28 31 11 Instalation Tips 32 33 12 Standard 010 34 34 REV 1 0 98 1 RMT Ltd DX6006 Introduction Company RMT Ltd introduces new series of optical units DX6006 suitable for designing of portable gas analyzers They are the key parts of optical gas analyzers The principle of operation is based on selective absorption of IR emission by gas molecules Dx6006 Optical Unit contains of gas sampling cell optoelectornic coordinated pair of light emitter and detector and electronic PCB for output signal pre amplification and driving by optoelectronic components The differential double frequency optical scheme provides high accuracy in wide range of humidity and wide temperature range
3. Parameter Value Volume bit 16 K 2Kx8 Number of re writing cycles not less 10 105 Write speed us 10 At Fig EP 2 is presented recommended schematics for usage of the E7PROM with outside controlled using PC interface The detailed information on C interface is possible to retrieve from technical data of Microchip Corporation http www microchip com IF Optical Unit O 5V i SDA Pin 11 sci controller S Micro E PROM Pin10 Fig EP 2 On board Memory usage 28 REV 1 0 98 RMT Ltd DX6006 E PROM Data Format Various operating parameters are stored in on board E PROM circuit e calibration data e synchronization parameters e measuring mode presets s TE cooling algorithm presets e Optical Unit identification The E PROM usage structure is placed in Table EP 1 Detailed description of usage of all data stored in memory are in User Manual for DX6001 Controller of RMT Ltd It was designed for optimal operation with DX6006 Optical Units E PROM Memory Structure Table EP 1 po a Content Command Calibration data block first calibration data Calibration data block Calibration data block Calibration data block Calibration data block Block of synchronization parameters Block of parameters of measuring cycle Parameters of thermostabilization of Detector Parameters of thermostabilization of Light Emitter Optical Unit Identifier
4. MERL LB V 44 096 V a ANY Measure o DO Fig EF 2 DX6006 4 10 Optical Unit pinouts Controller connection side view DX6006 4 10 pin function description Pin Mnemonic Description 01 GNDA Ground reference point for analog circuitry and EPROM 02 5V Optical Unit supply voltage 03 OUT Measuring channel output 04 OUTREF Reference channel output 05 TR1 Thermistor of photodetectors 06 ELED LED power supply 07 ETC2 LED s cooler power supply 08 TR2 Thermistor of LED 09 ETC1 Photodetector s cooler power supply 10 SCL I C interface Synchronization line 11 SDA IC interface Data line 12 TC1 Photodetector s cooler enable transistor 13 LED LED enable transistor 14 TC2 LED s cooler enable transistor 15 GNDP Ground reference point for power circuitry 1 6 REV 1 0 98 RMT Ltd DX6006 DX6006 5 00 pin function description Pin Mnemonic Description 01 GNDA Ground reference point for analog circuitry and E PROM 02 5V Optical Unit supply voltage 03 OUT Measuring channel output 04 OUTREF Reference channel output 05 TR1 Thermistor of photodetectors 06 ELED LED power supply 07 ETC2 LED s cooler power supply 08 TR2 Thermistor of LED 09 ETC1 Photodetectors cooler power supply 10 SCL C interface Synchronization line 11 SDA C interface Data line 12 Not c
5. 00 DX6006 05 H20 DX6006 4 10 Functional Diagram is presented in Fig EF 1 Differences are connected with some functionality of pre amplifiers and absence of pin TC1 and pin TC2 in output connector in model DX6006 5 00 Darken areas at electronic module s scheme mark internal parts of Light Emitter and Detector Output numbering coincides with numbers of connector pins The main functions of electronic modules are as following e power supply of optoelectronic components e pre amplification of output signals of measuring and reference channels of Detector e driving by Light Emitter e switching off TE coolers only for version 4 10 e storage of operating and individual calibration data of Optical Unit Six pins are used for power driving of Optical Unit e power input 5 V for pre amplifiers and precise 4 096 V reference pin 2 e Ground of measuring part of electronics 1 e power part s Ground 15 REV 1 0 98 1 3 DX6006 RMT Ltd e power supply of light emitter 6 e power supply of TE coolers of Llight Emitter 7 e power supply of TE cooler of Photodetector 9 Pin 6 gt Pin 15 Pin 8 a i Pin7 s HO ME a panas DX6006 4 10 only L Pin 1 V 4 096 V i precision gt Pi Be T znana TE man mam voltage EHS is v reference 8 y LY ig l H j KO a Pin 3 gt Pin 4 lo Pin 9 s iz L bee G DX6006 4
6. 10 only U Pin 15 e Pin 5 2 lt gt Pin 10 EPROM gt Pin 11 Fig EF 1 DX6006 4 10 DX6006 5 00 Functional Diagram REV 1 0 98 14 RMT Ltd DX6006 Pre amplifiers of measuring and reference channels are similar Amplification coefficient is 21 Reference channel output is connecter to pin 4 measuring one pin 3 The power MOSFET switch is used to drive by Light Emitter connector pin 13 In 4 10 type both TE coolers of Light Emitter and Photodetector could be disabled through pin 14 and pin 12 correspondingly The sensitive elements of Detector and Thermistors supplied by precise 4 096 V reference Load resistors serial to thermistor nominals optimized for maximal linearity and sensitivity in operation temperature range of optoelectronic components The outputs of Light Emitter s thermistor and Detector s one are contacted to pins 8 and 5 correspondingly Identification and operation parameters of optical unit are stored into on board E7PROM memory 16 Kb The data are available through pin 10 and pin 11 in full accordance with standard interface C TM Legend pla l umm TE cooler lai MOSFET switch te thermistor gt amplifier a V LED PC js a Trademark of Philips Corp REV 1 0 98 1 5 DX6006 RMT Ltd 3 4 5 9 10 11 12 15 8 S S E E T h 13 14
7. mounted at miniature PCB It provides optoelectronic components driving and output Intensity Intensity M x Wavelength TA Photoresistor L L Fillers L s Il Gas Flow Light Emitter Z US Wavelength REV 1 0 98 5 DX6006 RMT Ltd Optical Mechanical Design The Optical Unit is designed as integrated device It consists of isolated double pass gas sampling cell spherical mirror and sapphire window are placed at the end sides and opto pair with electronic module miniature PCB with output connector Gas sampling cell has four gas inlets For standard deliveries two of four gas inlets are closed but other ones have gas inputs pipes with 4 2 mm internal diameter Gas sampling cell could be easily disassembled for service of internal optics mirror and window For this purpose the cover cap of mirror is opened and mirror could be removed The mirror has special SiO safety layer At the back side of the optical units another aluminum cap covers electronic module This cap has four holes for mounting of the Optical Cell It is possible to remove the cap Light Emitter Connector Mirror PCB Dual element photodetector 6 REV 1 0 98 RMT Ltd DX6006 Dimensions Dia 35 4 mm Connector N Aspiration and Diffusion sampling modes are available N In standard option the Optical Units are made from anodiz
8. 0 C It is equivalent to temperature drift 1 0 2 C It means that if the thermo stabilization should be with accuracy of 0 1 deg then accuracy of measurements will be 0 5 a Accuracy of thermo stabilization Fig TE 2 Schematics of TE must be not less than required for coolers in 6006 5 00 module gas sensing Operating temperature of TE coolers must be selected optimal from Fig PA 5 and Fig TE 3 too lower temperature stabilization leads to higher power consumption at higher temperature the output signals and signal noise ration are lower The Optical Unit housing has been designed for additional heat dissipation from warm side of working TE coolers Maximal heat dissipation is 2 W At T T gt 40 C it is necessary to use additional heat dissipation bigger heat sink optional available or fan REV 1 0 98 23 DX6006 RMT Ltd In a custom made algorithm of thermo stabilization it has to be taken into account that time constant of TE cooler is approximately 2 s Electronic Scheme of TE cooling in DX6006 4 10 and DX6006 5 00 are presented at Fig TE 1 and Fig TE 2 correspondingly An example of recommended scheme of thermo stabilization is presented at Fig TE 4 and TE 5 TE Cooling Specifications Tam 20 C E 545 V unless otherwise noted ar Parameter Units Min Nom Max Comments Electrical parameters TE coolers Operating AT C 40 Operating Voltage V 4 3 Operating C
9. 01 zero ratio polynomial coefficients D AA Format of calibration data stored in E PROM memory chip is described below in E PROM Chapter g 5 0 Q 40 Cc S S 30 S 2 0 O m o E Le O 1 0 2 KT amp 00 e 1 0 1 5 2 0 25 3 0 3 5 D D Ratio The actual calibration of a typical DX6006 D D is the ratio of measuring to reference channel outputs U U at zero D and fixed D concentrations correspondingly REV 1 0 98 9 DX6006 RMT Ltd Re Calibration In standard option DX6006 Optical Unit is delivered with one calibration data The calibration is made at optimal operating temperature User can make re calibration in any time It is possible to do this at other operation temperatures with larger set of reference gases larger order polynomial and to replace stored data by new one According to customer demands the re calibration could done by manufacturer on reguest On board memory have additionally 4 data block for more calibrations totally up to 5 different calibrations The polynomial coefficients A depend on design of Optical Unit s optical scheme It is not necessary to make re calibration often 1 0 REV 1 0 98 RMT Ltd DX6006 Zero Adjustments To ensure the high accuracy simple adjustment can be made during operation to adjust Optical Units zero The zero parameter D should be periodically s
10. RMT Ltd Joint Stock Company Optical Unit DX6006 Series User Guide DX6006 RMT Ltd Edition November 1998 Copyright All right reserved Reproduction in any manner in whole or in part is straightly prohibited without written permission of RMT Ltd The information contained in this document is subject to change without notice Limited Warranty RMT Ltd warrants that DX6006 Optical Units if properly used and installed will be free from defects in material and workmanship and will substantially conform to RMT s publicly available specification for a period of one 1 year after date of DX6006 Optical Unit was purchased whatever purchased separately or as a part of gas analyzer system If the DX6006 Optical Unit which is the subject of this Limited Warranty fails during the warranty period for the reasons covered by this Limited Warranty RMT at this option will REPAIR the DX6006 Optical Unit OR REPLACE the DX6006 Optical Unit with another DX6006 Optical Unit Trademark Acknowledgments All trademarks are the property of their respective owners RMT Ltd Leninskij prosp 53 Moscow 117924 Russia phone 095 132 6817 fax 095 135 0565 e mail rmtcomOdol ru http www rmtltd ru REV 1 0 98 RMT Ltd DX6006 Contents 1 Introduction 3 3 2 Principles of Operation 4 4 3 Operation Overview
11. d for indirect measuring of initial intensity of light and allows to eliminate actual measurements conditions Operation Overview The DX6006 optical unit is specially designed for fast response high sensitivity low noise and low power consumption gas analyzer designing A number of design features contribute to the performance The infrared source is a special pulsed light emitter which operates in microsecond range The light source has long life gt 10000 hours and assembled with built in miniature TE coolers for its thermostabilization 4 REV 1 0 98 RMT Ltd DX6006 Radiation from light emitter is passed through gas sampling cell reflects from spherical mirror and focused onto dual element photodetector Both sensitive elements of the detector are similar First one measuring channel is covered by miniature narrow band 0 02 um optical filter tuned to absorption line of measured gas Second one also has built in narrow band filter but its wavelength lies out from absorption of the gas Both sensitive elements and its filters are placed onto miniature built in thermoelectric cooler The detector can be cooled and regulated down to 20 C Heat dissipated from warm side of TE coolers of light emitter and detector leads to few degrees of overheating of gas cell above ambient This factor plays the role of vapor anti condensation at operation in wet conditions Light emitter and detector are
12. due to internal thermostabilization New types of middle infrared light emitters and photodetectors with built in thermoelectric cooling are used There are several models suitable for the following gases CO Advantages high selectivity and stability wide range of measured concentrations the long service life RSS NR Features no moving parts minimum dimensions and light weight minimum power consumption SAS REV 1 0 98 3 DX6006 RMT Ltd Principles of Operation The DX6006 is based on Non Dispersive Infra Red Spectroscopy NDIR Classical double channel scheme is realized Intensities of two light beams passed through measuring gas sampling cell are compared One of the beams measuring channel has the wavelength which is tuned to optical absorption line of measured gas The other one reference channel server for control and it s wavelength maximum lies out from the absorption line According to fundamental low light absorption in gas volume is proportional to absorbing gas concentration I I xexp 4 x Lx X where l intensities of light before and after gas volume pass a absorption coefficient of the gas at chosen light wavelength L optical pass length X gas concentration At fixed L and known absorption a it is possible to find gas concentration using measurement of intensity of light measuring channel from light emitter passed to photodetector Reference channel use
13. ed aluminum Stainless steel option is available on reguest REV 1 0 98 7 DX6006 RMT Ltd Calibration The Photodetector output signal is non linear with respect to measuring gas concentration In spite of theoretical formula a light intensity passed through gas cell is the integral of various optical rays from Light Emitter Moreover sensitivity of Photodetector and performance of Light Emitter depend very from its operating temperatures Thus every DX6006 Optical Unit is provided by individual calibration The first calibration is made by manufacturer The factory standard calibration uses not less than 5 reference gases with concentrations within specified measuring range The polynomial formula is used X A4 XxY AXV AXY A RA D Um D Ur where X gas concentration ppm A A polynomial coefficients U U outputs of measuring and reference channels D zero ratio at zero concentration of measured gas Calibration results are attached to specifications of DX6006 optical unit Also the calibration data is stored in on board EPROM memory chip The calibration data is presented as T K x 10 operating temperature of Light Emitter and Photodetectors kept by built in TE coolers they are the same for both emitter and detector 8 REV 1 0 98 RMT Ltd DX6006 T K x 10 ambient temperature is valid for operation of DX6006 Optical Units with RMT s Electronic Controller Module DX60
14. et by flowing through Optical Unit gas with zero concentration For instance nitrogen argon and so on REV 1 0 98 11 DX6006 RMT Ltd Part Number Designations DX6006 XX XXX X X X XX XX Part Number Electronic Scheme Code Not for specifying in Order Form Opto Mechanical Modification Not for specifying in Order Form Operating Temperature Code Gas Z 410 to 45 C Concentration 10 to 45 C Range In ppm Heat sink option Includes two significant digits 0 standard of the concentration value 1 optional followed by the number of zeros to follow Gas Sampling Option A Aspiration D Diffusion An example DX6006 03 A 504 0 1 02 50 02 41 DX6006 Optical Unit 03 for CH4 concentration measuring 504 0 5 0 10 ppm 0 5 vol concentration range A aspiration option 0 without additional heat sink 1 for operation within 10 to 45 C temperature range 02 opto mechanical modification 02 1 2 REV 1 0 98 RMT Ltd DX6006 Electronics Functional Diagram DX6006 Optical Unit is supplied by electronic module PCB Two modifications are available DX6006 4 10 and DX6006 5 00 It is connected with some differences of optoelectronic components reguired for different gases and measuring parameters Optical Unit Gas Module DX6006 01 CO2 DX6006 4 10 DX6006 02 CnHm DX6006 4 10 DX6006 03 CHa DX6006 4 10 DX6006 04 CO DX6006 5
15. ifference in components nominals because some difference of sensitive elements of measuring and reference channels Every pre amplifier is a half part of lt 2 dual Op Amp la E J Amplification coefficient is H 21 without signal inver sion Load resistors nominals are optimized for coordi nation with resistivity of sensitive elements at operating temperature range Typical recommended outside schematics is Fig PA 1 Pre amplifiers of DX6006 4 10 Amplifiers specifications T 20 C En 5 V 45 Parameter Units Min Nom Max Comments Electrical parameters Pre Amplifiers Operating voltage V 4 6 Pin 2 Operating Current mA 1 45 Pin 2 Output current mA kis 3 Pin 3 4 Dinamical Parameters Rice Time US 15 Pin 3 4 Foult Time US 15 Pin 3 4 20 REV 1 0 98 RMT Ltd placed in Fig PA 1 Warning In designing of external electronics it is necessary to note that output signals of pre amplifiers are referenced to ground rail Fig PA 4 This means that if to use unipolar external amplifiers then they must have Rail to Rail input Moreover it is necessary to take into account that output signal of measur ing channel in depend ance of gas concentra tion should be changing within orders of value To preserve accuracy at DX6006 2 Fig PA 2 Pre amplifiers of DX6006 5 00 la
16. itor C together with other external capacitors works for accumulation of pulse energy for light emitter Typical recommended schematics for driving by the Light Emitter is Fig LE 2 presented at Fig LE 4 Power Supply 5 V 4 6 V are available through resistor R charges capacitor C in time 18 REV 1 0 98 RMT Led DX6006 duration between pulses Total capacity capacitor v C and available external z ones must be enough pe for pulse current stability 3 Fig LE 3 within Fig LE 3 Typical current 0 pulse shape through 10 30 50 70 Light Emitter T usec Light Emitter Specifications T 20 C Parameter Units Min Nom Max Comments Electrical Parameters Light emitter CW Current A 0 2 Pulse Current A 4 Q 200 t 100 us Direct Voltage Drop V 45 55 I 4A Switch Key Operating voltage V 12 412 Pin 13 Resistance mOhm d At 4 5V pin13 Resistor Nominal Ohm 0 95 1 0 Dynamical Parameters Time Constant us 1 5 Pins 3 and 4 a OM neh E R O 45 V Linear F Voltage E Regulator r Pin13 ON OFF Micro lt controller Pin 15 T O GND Fig LE 4 Typical LED control circuit REV 1 0 98 19 DX6006 RMT Ltd Preamplifiers The pre amplifiers measuring and reference channels sche matics is presented at Fig PA 1 and PA 2 The both channels are identical There are only d
17. m U In electronic PCB of Optical Unit is used 4 096 V Precise Voltage Reference Typical dependence of thermistor s scheme output vs measured temperature is presented in Fig TR 2 Recommended external schematics is presented at Fig TR 3 At least 12 bit resolution ADCs are recommended to apply 3 5 3 0 2 5 2 0 1 5 Res Thermistor Output V 1 0 30 25 20 15 10 5 0 5 10 15 20 Temperature C Figure TR 2 Thermistor s circuit Output vs Measuring Temperature 26 REV 1 0 98 RMT Ltd DX6006 Thermistors Specifications T 20 C En 5 V 45 Parameter Units Min Nom Max Comments Resistivity kOhm 2 09 2 2 2 31 at 20 C Beta Constant K 10 8 29 31 3 5 Optical Unit o bpe s 3 s PTH ADC V mno fh ADC Fig TR 3 Typical thermistor usage REV 1 0 98 27 DX6006 RMT Ltd E PROM The standard Electrically Fr Erasable PROM EPROM 24C164 chip is placed in Optical P Unit s PCB It is used to storage DE TN a ee of identification code of Opica Unit calibration data and some additional data for operation of the unit Additional data are used for operation of the Optical Units with manufacturer s controller DX6001 Without power supply the data are stored not less than 10 years E PROM Specification
18. of Photodetector e thermistors and sensitive elements of Photodetector e EPROM Power Supply for customer external electronics depends of scheme concepts It is necessary to note only that total current consumption of Light Emitter and TE Coolers of DX6006 Optical Unit is not more than 300 mA if operating temperature of TE coolers is preset as 0 5 C recommended Power supply A Control lt gt Circuits LED amp TE Coolers lt Pin9 add Drivers a si ME Shielding Ground Signal Ground Power Ground Fig IT 1 DX6006 Power Supply connecting Recommended connection is presented at Fig IT 1 32 REV 1 0 98 RMT Ltd DX6006 The most important thing is power circuit part and measuring circuit must be separated and have coupled Ground close to power supply Shielding Ground must contact Optical Unit housing with Fig IT 1 customer electronics with using optional cable DX6000 C 05 REV 1 0 98 33 DX6006 RMT Ltd Standard Kit Standard Kit of DX6006 consists of 1 Optical Unit DX6006 1 pe 2 Interface cable for 15 pins Connector 1 pc 3 15 pins Connector female 1 pe 4 User Manual 1 booklet 5 Specification 1 34 REV 1 0 98 RMT Ltd Leninskij prosp 53 Moscow 117924 Russia phone 095 132 6817 fax 095 135 0565 e mail rmtcom dol ru_ http www rmtltd ru REV 1 0 98 35
19. onnected 13 LED LED enable transistor 14 Not connected 15 GNDP Ground reference point for power circuitry 1 3 4 5 Zee NN NNN TERN lene wa 2 Giang ABBR AM Measure 4 096 V Fig EF 3 DX6006 5 00 Optical Unit pinouts Controller connection side view REV 1 0 98 1 7 DX6006 Light Emitter RMT Ltd Electronics Scheme Fig LE 1 for driving by of Light Emitter provides stable current pulses up to 5 A through the Emitter with duration of 50 100 psec The MOSFET transistor is used as switch key which is driven by TTL logic signals The resistor R in gate circuit fixes closed state of transistor at absence of activity from external electronic scheme Loading Resistor R 1 Ohm limits and stabilize 6 C T R WZ de 13 Ra 15 Fig LE 1 LED drive switch 5 T 25 C 0 2 4 6 Uren V Load line corresponds U 5V to following conditions R 1 Ohm current through light emitter The typical volt ampere plot of the Light Emitter is presented at Fig LE 2 Darken area means technological deviations of Light Emitter performance According to the Fig LE 2 at R 1 Ohm typical pulsed current is about 1 8 A 1 4 2 4 A Capac
20. rge measuring gas concentrations it is necessary to use external amplifier of measuring output with variable amplification coefficient It is to co ordinate the amplified signal with an ADC range 200 G 100 3 5 0 T 20 usec div Fig PA 3 Typical pulse at pre amplifiers outputs REV 1 0 98 21 DX6006 RMT Ltd Gas cell l Greiner 1 Pin 2 O 5V Pin 4 gt ADC Pin 3 gt ADC Pin 1 o af O GND Fig PA 4 Typical amplifier usage circuit 250 1 40 200 ime 1 20 2 gt SU T U U il 150 it i gt 1 00 S a at 0 80 2 L 0 60 O 3 T 0 40 0 0 20 20 415 10 5 0 5 10 15 20 Temperature C Fig PA 5 Preamplifier Output vs Operation Temperature 22 REV 1 0 98 RMT Ltd DX6006 Thermoelectric Coolers Driving by TE coolers lt 97 requires particular oe attention m First of all the operation of TE coolers directly affect on performance 12 14 parameters of Optical Units and gas sensors based on them At the second the TE ta coolers are the components which Fig TE 1 Schematics of TE coolers in consume largest part of 6006 4 10 module power Fig TE 3 Output signal of Photodetector depends very from their m lt _ gt 9 7 temperature Fig PA 5 This ratio is approximately 100 2
21. urrent A 0 4 Resistivity Ohm 6 7 69 7 1 1 kHz at 30 C Switch key Switching voltage V i2 412 Pin 12 14 Resistivity mOhm 80 At 44 5 V to pin 12 14 Dynamical parameters Time Constant 10 At Itc 0 gt Itc 0 4 A Time Constant c 10 Atltc 1 A gt ltc 0 2 0 1 5 Power Watts o 20 15 10 5 0 5 10 Temperature C Fig TE 3 TEC Power Consumption vs Operation Temperature 24 REV 1 0 98 RMT Ltd DE O E Ka ON OFF Micro controller Pin 15 L O GND Fig TE 4 Typical TEC control circuit for DX6006 4 10 Module Optical Unit E Pin 9 7 mme o z X Micro controller Pin 15 O GND Fig TE 5 Typical TEC control circuit for DX6006 5 00 Module REV 1 0 98 25 DX6006 RMT Ltd Thermistors For temperature driving by TE S AE coolers NTC thermistors built into cold side of TE coolers are used ed Zn These thermistors are applied in LM NA IN scheme with serial loading resistor Ura R and reference power supply U E Fig TR 1 Output signal from the thermistor V scheme depends on its resistivity which change with temperature as Fig TR 1 Thermistors connection in DX6006 module a U U ao TR REF One can see that temperature measurement accuracy depends directly fro
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