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LISST-

Tau User’s Manual

Operation Details

Page 19

LTAU1013R 2021-09-02T15:28:34 2146 31638 48136 16497

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LTAU1013R 2021-09-02T15:28:35 2148 31644 48118 16474

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LTAU1013R 2021-09-02T15:28:37 2149 31644 48139 16494

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Date TrCal TempCal CorrFunCal
TrCalCorr
Current 2021-07-29 13:10:30 1.115853 22.2C 1.000000 1.115853
New 2021-09-02 15:28:37 0.128417 21.8C 1.000000 0.128460
Ratio 8.689328 8.686362

Accept new calibration? [y|n]

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Содержание LISST-Tau

Страница 1: ...LISST Tau High Precision Transmissometer User s Manual Version 1 35 November 2021 2700 Richards Road Suite 107 Bellevue WA 98005 4200 Tel 1 855 753 3313 Store Software USB Card Here...

Страница 2: ...This page intentionally blank...

Страница 3: ...lease contact your local Distributor or Sequoia Please be sure to include the instrument serial number with any correspondence Warranty See Sequoia Scientific s standard warranty terms at www sequoias...

Страница 4: ...This page intentionally blank...

Страница 5: ...Establishing Communication with the LISST Tau 7 3 Using the LISST Tau software 9 4 Cleaning Windows 13 5 Clean water Baseline Measurement Calibration 14 D INSTRUMENT COMMUNICATION 15 E SERIAL COMMAND...

Страница 6: ...LISST Tau User s Manual Table of Contents Page vi This page intentionally blank...

Страница 7: ...bration factors to generate the final transmission and attenuation values The processing includes applying corrections for the small residual effects of temperature on the measurements Factory calibra...

Страница 8: ...rs may automatically install the first time the USB cable is plugged into the computer If the driver installed correctly you should see the green light on the USB cable blinking For more information o...

Страница 9: ...aneously communicate with multiple instruments 5 Verify Operation After connecting to the LISST Tau the software begins displaying the beam attenuation updated every second You can also switch the dis...

Страница 10: ...or storage Although the LISST Tau is robust handle it with the care you would any sensitive measuring instrument Always transport it in its original shipping case or a similarly rugged and well padde...

Страница 11: ...nt operation e g command list instrument mounting and deployment General Precautions LISST Tau is a sensitive optical instrument please handle it gently as you would handle an expensive camera Critica...

Страница 12: ...mory card Installer was found on LISST Tau memory card 2 Double click the Install_LISST Tau_V1_4 exe program and follow the onscreen instructions The installer will transfer the necessary files to you...

Страница 13: ...ter the driver installation is compete open the LISST Tau software LISST Tau software appears onscreen 4 The LISST Tau software will automatically search the available COM ports until it is able to co...

Страница 14: ...ntation to communicate with the LISST Tau make sure that the serial port settings are set to the following o Baud Rate 19200 o 8 Bits no parity 1 stop bit For example code for parsing the serial data...

Страница 15: ...left side of the window The most recent value is displayed as a number in the upper left of the window The last 15 minutes of data will be displayed in the strip chart In the Plot Controls group box y...

Страница 16: ...line 4 Access the LISST Tau command line interface The clock can be set by selecting the gear icon in the lower right corner A context menu will provide you with several options The set clock option w...

Страница 17: ...this process If you proceed with recalibrating the instrument you will be asked to confirm the new calibration coefficients The previous calibration coefficients will be overwritten and are not recove...

Страница 18: ...LISST Tau User s Manual Operation Details Page 12 The File and Format items in the menu bar offer several options for formatting the displayed texted and saving or logging the command line output...

Страница 19: ...ng action can be used if the windows are particle and grit free be careful not to drag large particle grains across window surface Use a dry piece of lens paper to wipe away the cleaner Repeat this pr...

Страница 20: ...ntainer with highly filtered degassed water The container must be large enough to fully submerged the LISST Tau It is recommended that the water be continuously recirculated through a 0 2 micron filte...

Страница 21: ...direct RS 232 connection The RS232 link communicates at 19200 baud 8 data bits No parity and 1 stop bit The format and definitions of the output quantities are listed in Appendix B Data Output Format...

Страница 22: ...able commands S Set Clock using format yy mm dd HH MM SS Z Start clean water re calibration Command Details DEFAULTS Restore standard factory operating setup Syntax DEFAULTS Description The LISST Tau...

Страница 23: ...0 4442 26 9 26 3 24 7 11 29 1 31 2019 12 23T11 39 04 1 08139 21 79442 1 01021 H Display Help Syntax H Description Display list of commands Example input H Output LISST Tau 1 46 Aug 24 2021 09 57 46 DS...

Страница 24: ...value Example input S output 2000 01 01T00 03 31 input S 19 12 31 11 59 59 output RTC set to 2019 12 31 11 59 59 Z Start Clean Water Re Calibration Baseline Measurement Syntax Z Description Re calibr...

Страница 25: ...13R 2021 09 02T15 28 35 2148 31644 48118 16474 LTAU1013R 2021 09 02T15 28 37 2149 31644 48139 16494 Date TrCal TempCal CorrFunCal TrCalCorr Current 2021 07 29 13 10 30 1 115853 22 2C 1 000000 1 115853...

Страница 26: ...nalog output on pin 6 of its main connector Scaling and Voltage Range The output voltage is proportional to transmission Although the LISST Tau circuitry can produce up to 5 0V on this output we set t...

Страница 27: ...C Storage temperature range 20 to 60 C Dimensions See figure on following page 5 1 cm 2 00 in diameter 40 6 cm 16 in overall length Weight in air 1 14 kg 2 5 lb Weight in water 0 59 kg 1 3 lb Depth ma...

Страница 28: ...LISST Tau User s Manual Appendix A Technical Specifications Page 22...

Страница 29: ...SN SN is a 4 digit number 1234 in example followed by one character indicating a model variant G for 532 nm or R for 650 nm String 2 Timestamp Date time of sample in ISO 8601 format yyyy mm ddThh mm...

Страница 30: ...ppendix B Data Output Format Page 24 11 TrCal Raw transmission clean water baseline SigLedOn SigLedOff RefLedOn RefLedOff e g 1 30319 Decimal 0 00001 12 TempCal Temperature of clean water baseline e g...

Страница 31: ...ng stringVariables serialString split t Load substrings into variables see Appendix B Data Output Format in User s Manual string name stringVariables 0 DateTime timestamp DateTime Parse stringVariable...

Страница 32: ...ead male on LISST Tau Female on mating cable SubConn MCBH6M SubConn MCIL6F Contact number Function 1 Ground 2 RS 232 Data In to LISST Tau from computer 3 Reserved for future use 4 Power In 8 to 24V 5...

Страница 33: ...ifference between LED on and LED off value measurements from the two photodiodes with front end amplifier circuits and analog to digital conversion are 0 0 and are the net signal transmitted and net r...

Страница 34: ...of raw transmission instrument temperature units of is also measured An instrument temperature correction function unitless is defined such that corrected raw transmission is For measurement of a wate...

Страница 35: ...anty terms at www sequoiasci com support warranty Version 1 33 July 27 2021 General editing throughout add section F Analog Output Version 1 32 April 16 2021 Restore Appendix D Electrical Connections...

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