AML Oceanographic Micro SVT User Manual
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AML Oceanographic Micro SVT User Manual

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User Manual for AML Oceanographic's Micro SVT Sensor
Micro SVT Sensor
______________
User's Manual
Version 1.21
Oct. 2004

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Summary of Contents for AML Oceanographic Micro SVT

  • Page 1 User Manual for AML Oceanographic’s Micro SVT Sensor Micro SVT Sensor ______________ User's Manual Version 1.21 Oct. 2004...

  • Page 2: Table Of Contents

    User Manual for AML Oceanographic’s Micro SVT Sensor TABLE OF CONTENTS TABLE OF CONTENTS........................2 INTRODUCTION ........................4 The Instrument......................4 The User........................5 STANDARD SPECIFICATIONS ................... 6 DESCRIPTION......................... 8 Functional Description ....................8 PREPARATION FOR USE ..................... 9 Inspecting the Instrument ..................... 9 Connection to a Computer ...................
  • Page 3 User Manual for AML Oceanographic’s Micro SVT Sensor MAINTENANCE ........................33 General Maintenance....................33 Replacing the batteries ....................33 7.2.1 Battery considerations for the Micro SVT ............34 7.2.2 Recommended Battery rating for the Micro SVT.........34 7.2.3 Battery dimensions..................34 7.2.4 Voltage capacity.....................34 7.2.5 Current Capacity ....................34 7.2.6 Maximum Current sourcing capabilities ............35...

  • Page 4: Introduction

    INTRODUCTION This manual describes the AML Oceanographic Micro SVT Sensor. If additional items such as sensors or software are used in conjunction with the Micro SVT Sensor the manuals for these items should also be consulted. Examples of additional manuals...

  • Page 5: The User

    <ENTER> or <RET>. The data output may be configured to display either unprocessed integers, or computed engineering values. The Micro SVT Sensor has the option of sampling on command or monitoring continuously with programmable sampling rates. The latter is not available with the binary protocol.

  • Page 6: Standard Specifications

    User Manual for AML Oceanographic’s Micro SVT Sensor STANDARD SPECIFICATIONS Note: If the instrument has a custom configuration the additional specifications will be listed in Appendix A. Sound Velocity: Time of Flight Range: 1375 - 1600 m/s Accuracy: 0.05 m/s from 1400 to 1550 m/s Resolution: 0.01 m/s...
  • Page 7 User Manual for AML Oceanographic’s Micro SVT Sensor 269 mm (10.6 in) Weight: 382 g (0.84 pounds) in air for Acetal 10 g (0.02 pounds) in water for Acetal Environment: operating: -2 to 40ºC (28 to 104ºF) storage: -40 to 60ºC (-40 to 140ºF)

  • Page 8: Description

    DESCRIPTION FUNCTIONAL DESCRIPTION The Micro SVT Sensor has two separate sensors, refer to figure 3.1, each of which responds to a specific property of the water environment. The sound velocity sensor measures the transit time of an acoustic pulse across a fixed distance. The temperature...

  • Page 9: Preparation For Use

    At AML we do our best to package our instrumentation to avoid damage during shipping, as should the user. However accidents do happen, so an inspection of the Micro SVT Sensor before each use will assist in spotting problems that could lead to inaccurate data or possible failure.

  • Page 10: Powering The Micro Svt Sensor

    Power for the Micro SVT sensor is turned off if the there is no shorting plug or data/power cable plugged in to the battery pack.

  • Page 11: Micro Battery Pack

    2400 and 38400 baud. Apply power to the instrument and press the <enter> key. The standard Micro SVT Sensor will respond with its header information. Note that some units may be configured for custom outputs and may not respond with a header. This header identifies the sensor type, serial number and firmware version.

  • Page 12: Communications

    The standard data format is for RS-232C ASCII based sensors. Custom data outputs and formats are listed in appendix A. The Micro SVT Sensor can output data in Raw or Real modes. The mode can be changed by supplying the appropriate command. Refer to section 5.1.2 for commands.

  • Page 13: Raw Output Mode

    User Manual for AML Oceanographic’s Micro SVT Sensor 5.1.1.3 Raw Output Mode The Raw mode shows the outputs from the analog to digital converters for each sensor. No compensation or manipulation of the data is performed in Raw mode. Refer to section 8 and appendix B to convert the raw data values to engineering data.
  • Page 14 User Manual for AML Oceanographic’s Micro SVT Sensor Command: SET [SE] SAMPLE RATE [S] This command sets the rate at which the instrument will take samples (or scans). The sample rate is in the form of a number followed by the time units. The allowable time units...
  • Page 15 User Manual for AML Oceanographic’s Micro SVT Sensor Command: DUMP This command dumps the instrument’s logged data from memory. The data will be dumped as REAL data and is in the following format. Example: >DUMP [ret] New Cast 03/05/03 14:23:06:02 1523.74 11.793 03/05/03 14:23:07:02 1523.75 10.232...

  • Page 16: Advanced Commands

    User Manual for AML Oceanographic’s Micro SVT Sensor 5.1.3 Advanced Commands 5.1.3.1 Display commands Command: DIS SCAN [D SC] This command will display the current scan options. Example: >dis scan Scan delay is 100 Display time: yes Display date: no Command: DIS STARTUP [D ST] This command will display the current startup options.
  • Page 17 (when the enter key is pressed) before it defaults to the baud rate set by the value of ‘b’. If a = 0 the Micro SVT will not auto baud and will default to the baud rate specified by the value of ‘b” at each power up.
  • Page 18 Micro SVT. On power up, the Micro SVT will wait for 200ms before entering into the RXOFF mode and during this time sending a carriage return will disable the RXOFF features.

  • Page 19: Set Scan Options

    This command is used for sensors that have a slower power up response time. Example: >set scan delay 20 (sets the scan delay to 4 seconds) In the above example, the Micro SVT would power up the sensor boards, wait 4 seconds then take a scan of data. Micro...

  • Page 20: Analog Board Commands

    These channels may be used to incorporate additional sensors such as Ph, Do2 or any other sensor outputting a voltage. When the Micro SVT is equipped with an analog board, the following commands can be used to configure the extra channels.
  • Page 21 If the auto baud feature has not been disabled, the Micro SVT will wait for a carriage return before it outputs data. (See SET DETECT command). The following example set the Micro SVT to output data at power up with a baud rate of 9600.

  • Page 22: Accessing The Calibration Coefficients

    This command instructs the Micro SVT to display a prompt at power on. If the auto baud feature has not been disabled, the Micro SVT will wait for a carriage return before it outputs a prompt. (See SET DETECT command).

  • Page 23: Editing The Calibration Coefficients

    DIS COEFFICIENTS or SET commands. The following describes the method to edit the Calibration coefficients for each parameter of the Micro SVT using the SET command. Refer to the TALK command for accessing the coefficients.
  • Page 24 User Manual for AML Oceanographic’s Micro SVT Sensor Example: >talk 203 (enter talk mode with the sound velocity board) Entering talk mode Sound Velocity Micro Sensor V1.40 SN:0002-SV >set a=7.361894E-04 (set the a coefficient) >dis c (display the sound velocity sensor coefficients) Sound Velocity A=7.361894E-04 B=-7.438164E-056 C= 1.07834E-06 D=-5.791932E-07...
  • Page 25 User Manual for AML Oceanographic’s Micro SVT Sensor Command: SET 2n=c Where n = coefficient letter a,b,c,d c = calibration coefficient Example: >talk 202 (enter the talk mode with the analog board) Entering talk mode Analog Micro Sensor V1.30 SN:0003-A >set 1a=1 (set the a coefficient of channel 1)

  • Page 26: Logging Data

    Micro SVT Sensor. The terminal emulation programs can communicate with RS-232 equipped Micro SVT Sensors or with the Smart Network Controller to communicate with RS-485 Micro SVT Sensors. Connect the Micro SVT Sensor to a serial port on the computer (refer to section 4.2).
  • Page 27 User Manual for AML Oceanographic’s Micro SVT Sensor Launch the terminal emulation program and select the communications port to which the instrument is attached. Select 8 bits, no parity, 1 stop bit and the desired baud rate. Power the instrument and then press <enter>. The instrument will respond with an identification header and then a prompt.

  • Page 28: Precautions And Troubleshooting Guide

    Prior to storing the Micro SVT, the sound velocity sensor must be washed thoroughly in fresh water before the sensor is allowed to dry. This will prevent the build up of salt deposits on the sensor.

  • Page 29: Electrical Interference

    Due to the small board size of the Micro sensors they are less susceptible to radio interference than many other instruments. However, they are not immune. Tests show the Micro SVT can withstand a 5 Watt, 144 MHz RF transmitter operating 2 metres away from the instrument without any degradation in performance.

  • Page 30: Troubleshooting Guide

    The following section outlines some of the most common problems encountered by users of the Micro SVT Sensors. A brief list of suggested solutions has been provided. If the difficulties persist, please do not hesitate to contact the AML Oceanographic service staff.
  • Page 31 User Manual for AML Oceanographic’s Micro SVT Sensor Problem: The instrument communications are intermittent. Solutions: • The communications cable has been inserted incorrectly. Check the cable connections at the computer and the instrument. Examine the pins on the instrument connector for bent or corroded pins.
  • Page 32 User Manual for AML Oceanographic’s Micro SVT Sensor Problem: The temperature sensor readings are incorrect. Solutions: • The temperature sensor is faulty. Examine the capillary tube of the temperature sensor for bends, pits or cracks. If any are found the sensor will have to be replaced. Contact...

  • Page 33: Maintenance

    User Manual for AML Oceanographic’s Micro SVT Sensor MAINTENANCE GENERAL MAINTENANCE The Micro SVT Sensor has been designed to minimize user maintenance. To keep the instrument in top condition the following maintenance is required: After each deployment, the Micro SVT Sensor case should be washed thoroughly with distilled or fresh water.

  • Page 34: Battery Considerations For The Micro Svt

    7.2.1 Battery considerations for the Micro SVT Care should be observed when choosing replacement lithium batteries for the Micro SVT. Battery characteristics such as physical size, current capacity, voltage capacity and maximum current sourcing capability should be considered.

  • Page 35: Maximum Current Sourcing Capabilities

    Maximum recommended continuous currents (below 800ma) may produce a sharp voltage drop when the Micro SVT demands a burst of current such as when it powers up or when an optional sensor or pump is turned on. If the voltage drops below the Micro CTD’s operational voltage, the...

  • Page 36: Calibration

    1 to 2 years, depending on the amount of use and other conditions occurring in the deployment environment. The sensor accuracies are also dependent upon proper care and maintenance by the user. AML Oceanographic recommends recalibrating the instrument annually, however some standards agencies specify semi-annually for all sensors used in bathymetry work.

  • Page 37: Warranty

    WARRANTY Warranty and limit of liability AML Oceanographic warrants the instrument for a period of one year from the date of delivery. AML Oceanographic will repair or replace, at its option and at no charge, components that prove to be defective.

  • Page 38: Appendix 'A': " Drawings

    User Manual for AML Oceanographic’s Micro SVT Sensor APPENDIX ‘A’: “ Drawings ”...

  • Page 39: Appendix 'B': " Using Hyperterminal

    Sensor. USING HYPERTERMINAL Connect the Micro SVT Sensor to the data cable. Connect the data cable to the serial port of the computer. If the Micro SVT Sensor is externally powered connect the data cable power leads to a 12 volt DC supply.
  • Page 40 Copywrite 2003, AML Oceanographic > Once the prompt appears, the Micro SVT Sensor is ready to accept instructions. Refer to the RS-232 Command Summary, section 5.1.2. Caution: Some versions of Hyperterminal have a bug which does not allow the properties to be changed unless the disconnect command is selected under the Call menu before changing the properties.

  • Page 41: Appendix 'C': " Using Procomm

    User Manual for AML Oceanographic’s Micro SVT Sensor APPENDIX ‘C’: “ Using PROCOMM ” To communicate with the Micro SVT Sensor a terminal emulation program such as PROCOMM can be supplied. This DOS based program provides the mechanism of communication between the instrument and an IBM compatible computer.
  • Page 42 Micro SVT Sensor V1.42 SN:7122-SVT Copywrite 2003, AML Oceanographic > Once the prompt appears, the Micro SVT Sensor is ready to accept instructions. Refer to the RS-232 Command Summary in section 5.1.2. To leave PROCOMM, the <ALT>X key combination is used.

  • Page 43: Appendix 'D': " Quick Guide

    Micro SVT and the RS-232 port of the computer. If the Micro SVT Sensor does not have a battery pack, connect the data cable wires to a DC power source (8 to 16 volts, 12 volts nominal). The red wire should be connected to the positive side of the supply and the black wire to the negative side of the supply.

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