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Geonics Limited EM38-MK2 Operating Instructions Manual

Data logging system for field computer allegro cx field pc
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OPERATING INSTRUCTIONS
EM38-MK2 DATA LOGGING SYSTEM
FOR FIELD COMPUTER Allegro CX Field PC
EM38MK2
Version 1.15
March, 2008
G
L
eonics
imited
1745 Meyerside Drive, Mississauga, Ontario, Canada L5T 1C6
Tel: (905) 670 9580
Fax: (905) 670 9204
E-mail: geonics@geonics.com

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  • Page 1 OPERATING INSTRUCTIONS EM38-MK2 DATA LOGGING SYSTEM FOR FIELD COMPUTER Allegro CX Field PC EM38MK2 Version 1.15 March, 2008 eonics imited 1745 Meyerside Drive, Mississauga, Ontario, Canada L5T 1C6 Tel: (905) 670 9580 Fax: (905) 670 9204 E-mail: geonics@geonics.com...

  • Page 3: Table Of Contents

    Short description of Main Screen options ...............4 Survey Setup ....................5 Logger Setup....................9 3.1 Bluetooth Connection of EM38-MK2 and Allegro CX ......10 Set Port for GPS..................13 4.1 Monitoring GPS Receiver Output ............15 Display Options ..................19 Logging Data ....................

  • Page 5: Introduction

    (magnetic susceptibility) components, the defining difference between the models is the number of included receiver coils: the EM38-MK2-1 includes one receiver coil with a 1 meter transmitter / receiver intercoil spacing; the EM38-MK2-2 includes two receiver coils with 0.5 and 1 meter intercoil spacings.

  • Page 6: Program Requirements

    PCMCIA memory card to transfer files. Geonics EM38-MK2 The EM38-MK2 instrument with associated cables. The EM38MK2 program for Allegro CX is stored on DAT38MK2 CD disk. All necessary initial files (with extension names .INI) as well as data folder (DATA38MK2) are created in your field computer after the program is run for the first time.

  • Page 7: Running Em38Mk2 Program

    1.4 Running EM38MK2 Program To run the EM38MK2 program, locate it in the C_Program Files and double-tap its icon. The EM38MK2 is a Windows CE based, button and dialog driven program designed to be simple to use. Although the program fully supports touchscreen interface, keyboard entry may be convenient in some field applications.

  • Page 8: Short Description Of Main Screen Options

    The dialog which will allow you to specify colour and thickness of profile lines will appear. This dialog provides also choice of gid lines for Conductivity or Inphase scale. View Files This option allows to review data files saved in Allegro. Exit This option will terminate the program execution. Geonics Limited...

  • Page 9: Survey Setup

    (survey line names, line spacing, start station, station increment, etc.). Description of Options and Parameters: EM38/2 Mode (EM38-MK2 Mode) This option allows you to select the type of instrument survey mode. Set the EM38MK2 mode of operation by selecting an item from the drop-down list box labeled EM38/2 Mode. Available modes are: Auto and Manual.
  • Page 10 This parameter describes number of readings per second that will be taken. Any number larger than zero can be entered, however the EM38-MK2 fixed frequency of data output is 21 readings per second. Therefore any entered value is rounded to the nearest possible base frequency of the instrument, i.e.
  • Page 11 If Auto mode was selected then only two dipole modes are available: Vertical or Horizontal (see Figure below). Survey Line (survey line name) Activate text box by tapping or using TAB key and then enter desired name (number) for the survey line. This is a user’s tag number/name for the profile line.
  • Page 12 Survey Setup dialog. To return to original settings (settings before this dialog was selected) tap Cancel (X) button or press Esc key. All parameters will be reset to initial settings and the program will return to the Main Screen. Geonics Limited...

  • Page 13: Logger Setup

    Allegro via Bluetooth is described below in section 3.1. The program default is COM1. Communication parameters for the selected serial port are set by the program, since the EM38-MK2 operates at fixed settings: Baud Rate (19200), Parity (N), Data Bits (8), and Bit Stop (1).

  • Page 14: Bluetooth Connection Of Em38-Mk2 And Allegro Cx

    All parameters will be reset to initial settings and the program will return to the Main Screen. 3.1 Bluetooth Connection of EM38-MK2 and Allegro CX Data can be transferred from EM38-MK2 to Allegro CX by a wireless Bluetooth connection. To select Bluetooth connection select Bluetooth item in EM38-MK2 Port list box (Figure below).
  • Page 15 When the progress bar in the above window ends a list of detected Bluetooth devices will be dis- played. In most cases it will only be EM38-MK2, however if any other Bluetooth enabled device is in range (for example cellurar telephone, GPS receiver, etc.) it will also be placed on the list.
  • Page 16 Please select Geonics EM38-MK2 by tapping the Select button. If Geonics EM38-MK2 is displayed as the only item, the Select button must still be tapped or executed from the keyboard (in most cases this button is highlighted, therefore pressing ENTER on the keyboard is sufficient). At this point the operating system will gather the necessary information from the EM38-MK2 Bluetooth device.

  • Page 17: Set Port For Gps

    GPS parameters. The GPS Input can be Enabled even if there is no GPS system connected to the Allegro. In such case data file will contain proper sequence of EM38-MK2 readings without any GPS input. Tapping on the down arrow next to the text box labeled GPS Input opens a drop-down...
  • Page 18 Allegro operation system, therefore if Bluetooth con- nection is assigned for EM38-MK2 data acquisition the GPS receiver must then use one of the physical serial ports. If Bluetooth communication is selected then all serial communication parameters described below are ignored by the program since they are adjusted automaticaly by the Allegro operating system.

  • Page 19: Monitoring Gps Receiver Output

    Stop Bits Specify Stop Bits for the output port, the selected value should much settings in the GPS receiver, default is 1. Available selections are 1 or 2. Tapping on the down arrow next to the text box labeled Stop Bits opens a drop-down box showing the available parameters, or when the keyboard is used activate this text box by pressing TAB key and then by using up or down arrow keys select one of available items.
  • Page 20 GPS receiver. Tapping Cancel button or pressing the <Esc> key will cancel the command and hide the NMEA Message dialog. An example of a command that will enable the NMEA message SAT is given in the below figure (it is assumed that the GPS receiver output serial port is A). Geonics Limited...
  • Page 21 After this command is received by the GPS receiver, the confirmation message will be send by the receiver ($PASHR, ACK*3D) and data stream will contain the message SAT ($PASHR, SAT,..in the above figure). Please note, that not every GPS system accepts and uses the same standard set of NMEA commands and messages.

  • Page 23: Display Options

    5. Display Options After the Display Options button was tapped (or executed from the keyboard) in the Main Screen the Display Options dialog window appears on the screen. This dialog allows you to enable and disable the display of each channel profile, specify color and thickness of profiles, and select grid lines for conductivity or Inphase scale.
  • Page 24 Survey Setup dialog. To return to original settings (state before this dialog was selected) tap Cancel (X) button or press Esc key. All parameters will be reset to initial settings and the dialog window will disappear. Geonics Limited...

  • Page 25: Logging Data

    6. Logging Data After the Monitor/Log button (in Main Screen) is tapped or executed by the keyboard, the program enters logging session which contains three modes: Monitoring, Stand By and Logging. Program starts logging session always in Monitoring mode. In this mode EM38MK2 readings, dipole mode and GPS parameters can be examined quickly and a data file can be created.
  • Page 26 The second, largest graphic section will be used to display profiles during the logging of data. The third section contains two lines of text. The first line is used to display EM38-MK2 readings and the second line of text provides GPS related information.

  • Page 27: Description Of Monitoring Mode Options

    To cancel selection and return to Monitoring mode tap the Cancel (X) button or press Esc key. Calibrate (automatic calibration of EM38-MK2) This option allows you to calibrate EM38-MK2 using automatic, software based method. Calibration procedure is the same as described in the EM38-MK2 Operating Manual how- EM38MK2 Data Logging System (DAS70-CX)
  • Page 28 Y (or Enter if button is highlighted). After button Yes was tapped a messages box disapears and a prompt Vertical Calibration is displayed. From now on all mesages and prompts will be written under plot section of the screen, in a line that is normally used to display GPS parameters. Geonics Limited...
  • Page 29 After Vertical calibration is completed (usually few seconds) the program will beep and a message Rotate to Horizontal mode within 60 seconds will appear. In cases where rotating the instrument takes longer than 1 minute the program will display the message "Horizontal Mode Failed - Wait for Beep", and after a short delay (about 2 seconds) the program will return to normal operation.
  • Page 30 If this option was used by accident please tap button labeled No and all calibration factors will remain the same. Exit (exit Monitor mode) After tapping Exit button (or executing this option using keyboard) the program immedi- ately returns to Main Screen. Geonics Limited...

  • Page 31: Stand By Mode

    Ver (vertical dipole mode ) or Hor (horizontal dipole mode). EM38-MK2 readings (in numeric form) are updated in Stand By mode approximately 21 times per second. Profiles in the plot area are updated only during Logging mode when data are actually saved in the data file.

  • Page 32: Logging Mode

    Logging (at the top of the display) and data will be logged in the mode correspond- ing to the selected EM38-MK2 mode in the Survey Setup menu. All labels and parameters (with the exception of buttons representing Stan By mode options) are the same as in Stand By mode and they are described in the preceding section 6.2.

  • Page 33: Stand By Mode Field Options

    Logging mode returns to the Stand By mode. In Stand By mode the EM38-MK2 data will be displayed with the update rate approximately 21 readings per second, however data will not be saved in the log file and profile curves will be not updated.
  • Page 34 Selecting this option allows the operator to enter a new station number (within the same survey line). The New Station dialog is displayed. Start and Current station are displayed at the top of the dialog. The New Station can be entered in the provided edit box labeled New Station. Geonics Limited...
  • Page 35 Tap the button OK or press ENTER key to accept the new value. The program will return to the Logging window in Stand By mode. Current station (Stn:) value will be updated and after data logging is activated the profile curves will have a small gap (two pixels) showing the new station entry (see Figure below).
  • Page 36 Inphase scale. Values displayed in bold indicate the scale that is associated with grey grid lines. After minimum and maximum values are specified tap the button OK or press ENTER key to accept new values and the profile plot area will be redrawn (see Figure below). Geonics Limited...
  • Page 37 Cancel (X) button or press Esc key, the dialog window will disappear. Calibrate (automatic calibration of EM38-MK2) This option allows you to calibrate EM38-MK2 using automatic method. After Calibration is selected in the pop up menu the Calibration dialog appears on the screen.
  • Page 38 During data collection (in Stand By mode) a confirmation message will be displayed (there is no such message if Exit is performed in Monitoring mode) before program exits logging window. After above message is confirmed the program stops logging, closes data file and returns to Main Screen. Geonics Limited...

  • Page 39: View Data Files

    7. View Data Files This option allows you to view recorded data files. After the View Files button is tapped (or executed from the keyboard) in the Main Screen the View Data Files window will be displayed. A current display scales (minimum and maximum value for Conductivity and Inphase) is given by two labels located at the top center of the screen (i.e.
  • Page 40 8 values at one station) To change the currently displayed survey line use the drop-down box labeled Line located in the top right corner of the window. Tapping on the down arrow next to the text box labeled Line opens a Geonics Limited...
  • Page 41 drop-down box showing the available survey lines. When the keyboard is being used you can activate the text box by pressing the TAB key until the drop down box is highlighted and then by using Up or Down arrow keys select one of available lines (as shown below). To shift the range of the displayed stations and to move the vertical bar indicating the currently displayed station, use the buttons located along the bottom of the View Files window.
  • Page 42 To exit the View Files window tap the button labeled Exit (or from keyboard use shortcut key X or press key ENTER when the button is highlighted) to close file (if open). The program will return to Main Screen. Geonics Limited...
  • Page 43 (0 = Vertical, 1 = Horizontal, 2- Both ) EM38MK2 survey mode (0 =Auto, 2 =Manual) not used ( 0 - fixed) instrument type ( 1 = EM38-MK2-1, 2 = EM38-MK2-2) File Name file name, maximum 8 characters Time/Samples -...
  • Page 44 Time Stamp in ms (10 digits) indicator T, t, or 2 first reading at the EM38-MK2-2 station (default for Auto mode) first reading at the EM38-MK2-1 station (default for Auto mode) second reading at station (possibble only in Manual mode)
  • Page 45 Multiply Channels 1 to 4 according to the following formula to obtain Conductivity or Inphase readings in mS/m or ppt. (In EM38-MK2-1 data only channels 3, 4, and 6 are valid). Reading (Conductivity or Inphase) = (Channel x 5 / 1024 - 160) x 8 Multiply Channels 5 and 6 according to the expression given below obtain Temperature readings in degrees.
  • Page 46 The GPS sequence may contain 4 to 6 records. Component of the GGA message may differ in length, however they are placed in the same number of columns. Refer to Appendix B (section B.2) for definition of each component of GGA data message. Geonics Limited...
  • Page 47 A.2 Example of Data File in EM38MK2 (Allegro CX) Format The EM38MK2 data file records are written in binary format, therefore the file may have different shape when displayed or printed, depending on particular video or printer settings. EM38MK2 W115GPS00002 H 090916A 0.100 0.00...

  • Page 49: Using The Em38Mk2 With A Gps Receiver

    EM38MK2 running in Allegro CX logger uses less than 100 ms to process and record GPS data from two NMEA messages, GGA and GSA. Only message GGA is necessary to position EM38-MK2 data. If message GSA is not available in a particular system, the EM38MK2 will function and record position data based on GGA message.

  • Page 50: Description Of Gga And Gsa Data Messages

    Mode, 2 = 2D, 3 = 3D d2-d13 Satellites used in position computation (range 0 to 32) PDOP (range 0 to 99.9) HDOP (range 0 to 99.9) VDOP (range 0 to 99.9) Checksum <CR><LF> Carriage return and Line Feed Geonics Limited...

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