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Geonics Limited EM61LX2 Operating Instructions Manual

Data logging system for field computer mesa2
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OPERATING INSTRUCTIONS
EM61LX2 DATA LOGGING SYSTEM
FOR FIELD COMPUTER MESA2 (MS Windows 10)
EM61LX2
Version 1.13
April, 2023
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 EM61LX2 DATA LOGGING SYSTEM FOR FIELD COMPUTER MESA2 (MS Windows 10) EM61LX2 Version 1.13 April, 2023 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

    6.5 Logging Screen Layout in the Portrait Display Orientation ...... 52 Appendix A ....................... 55 A.1 Description of Data File in EM61LX2 (L61) Format ........ 55 A.2 Conversion Factors ................58 A.3 Example of File in EM61LX2 Format ............ 60...

  • Page 5: Introduction

    GPS signal quality during data collection. The EM61LX2 program records data together with a time stamp at each station. Data files created with this program can be used to position a survey according to locations recorded separately by a Global Positioning System (GPS).

  • Page 6: Program Requirements

    The EM61-LX2 instrument with associated cables (or Bluetooth option). The EM61LX2 program may be stored on DAT61LX2 CD disk, USB memory stick, or it is available for download from the Geonics web site. All necessary configuration files (with extension names .INI) are created in your field computer after the program is run for the first time.

  • Page 7: Main Menu

    The EM61LX2 is a command button and dialog driven program. Command buttons can be ex- ecuted by taping (if touch screen is used) or clicking with the left mouse button, or by pressing the indicated (underlined) character on the keyboard, or by using TAB to scroll through the buttons and ENTER to execute.
  • Page 8 Survey Setup The Survey Setup dialog will be displayed. The EM61-LX2 update rate, and all survey set- tings (survey line name, increments, etc.) can be specified in this dialog. Geonics Limited...
  • Page 9 GPS receiver and examine GPS stream type.. Display Options The dialog which will allow you to specify colour and thickness of profile lines will appear. This dialog provides also choice of linear or compressed amplitude used for profile display. EM61LX2 Data Logging System (DAS70-M2)
  • Page 10 View Files This option allows to review data files saved in the field computer. Exit This option will terminate the program execution. Geonics Limited...

  • Page 11: Survey Setup

    18 Hz program will record every record, at selection 9 Hz the program will record every 2nd reading, selection 6 Hz will cause program to record every 3rd read- ing, and so on. EM61LX2 Data Logging System (DAS70-M2)
  • Page 12 Activate text box by tapping or using TAB key and then enter the desired value for the start station. This parameter specifies the starting station number for the selected survey line. This value is used in conjunction with Station Increment to calculate the current station number for display purposes. Geonics Limited...
  • Page 13 To return to original settings (state before this dialog was selected) tap or click on the Cancel but- ton. All parameters will be reset to initial settings and the program will return to the Main Screen. EM61LX2 Data Logging System (DAS70-M2)

  • Page 15: Logger Setup

    The System Setup dialog is presented below in two Figures for program used at computer landscape and portrait display orientation. Despite different layout all parameters are exactly the same. EM61LX2 Data Logging System (DAS70-win)

  • Page 16: Description Of Parameters

    When one sensor is selected then it is considered by the program as the left sensor. Labels "sensor one" as well as left sensor are "synonymous", as for example during specifying Filter Factors below. Geonics Limited...
  • Page 17 GPS Port Setup dialog. The GPS port can be also assigned in the latter dialog. This port must be different than the port specified as the EM61-LX2 serial port. Select port number in the drop-down list box similarly to EM61-LX2 port assignment procedure. EM61LX2 Data Logging System (DAS70-win)
  • Page 18 Mesa2 keyboard are reserved for Fiducial Marker. Soft Marker Key A software based fiducial marker is available in the EM61LX2 program. There are two available selections for the Soft Marker Key: Disabled and any arrow or numeric key.
  • Page 19 Pause key. Alarms Options There are two types of alarms (not counting the third: Disabled) in the EM61LX2 program. The Simple Alarm is triggered whenever the indicated amplitude level is exceeded. The Enhanced Alarm contains four parameters that describe minimum and maximum levels, width of anomaly, and number of descending points.
  • Page 20 Sound Type selection. Parameters described below can be selected only when the Enhanced Alarm is selected. When En- hanced Alarm is selected conditions for all set parameters must be reached to trigger alarm. Geonics Limited...
  • Page 21 Specify number of samples (1 or 2) that must be lower after the peak of anomaly. This option is used to avoid false alarm when the signal rises along the slope before reaching its maximum. Available selections are 1 or 2. EM61LX2 Data Logging System (DAS70-win)
  • Page 22 Setup dialog. To return to original settings (state before this dialog was selected) tap or click on the Cancel but- ton. All parameters will be reset to initial settings and the program will return to the Main Screen. Geonics Limited...

  • Page 23: Set Port For Gps

    The number of serial port that is assigned to the GPS input. Available selections: COM1 to COM60. The program default is COM2. Communication parameters for the selected serial port can be determined in options described below. EM61LX2 Data Logging System (DAS70-AR2)
  • Page 24 TAB key and then by using up or down arrow keys select one of available items. Parity Select Parity for the output port, the parameter should much the Parity set in the GPS serial port settings. Available settings are None, Even, and Odd; default is N. Geonics Limited...

  • Page 25: Monitoring Gps Receiver Output

    This screen is shown below. As soon as the EM61LX2 screen is in terminal mode and the GPS is streaming data, each message transmitted by GPS receiver will appear in the top portion of the display (the end may be cut off...
  • Page 26 GPS receiver output update rate. Most high resolu- tion geophysical surveys require positioning update of 1 or 2 seconds, and a 5 seconds interval can be used only when the survey is carried out at an even pace and along relatively straight survey lines. Geonics Limited...
  • Page 27 In addition, some GPS systems do not accept commands sent by the serial port at all. The configuration of these type of receivers can be updated only by the controlling device (usually GPS logger, controller, or the receiver panel keys). EM61LX2 Data Logging System (DAS70-AR2)
  • Page 28 Geonics Limited...

  • Page 29: Display Options

    Description of Options and Parameters: Color To change colour of each profile tap or click the corresponding button (with colour line) labeled Color at the top and a sample colour line on the button will tilt, see Figure below. EM61LX2 Data Logging System (DAS70-win)
  • Page 30 (see Figure below). Select thickness by tapping on the desired selection. If keyboard is used activate text box by pressing TAB key (till the box is highlighted) and then by using up or down arrow keys select one of available items. Geonics Limited...
  • Page 31 Survey Setup dialog. To return to original settings (state before this dialog was selected) tap the Cancel button. All pa- rameters will be reset to initial settings and the dialog window will disappear. EM61LX2 Data Logging System (DAS70-win)

  • Page 33: Logging Data

    The Monitor mode allows initial inspection of the range of the instrument readings at a particular site, monitoring the instrument performance, quick inspection of the condition of the instrument battery, reading scale, display mode, and setting zero level of the instrument. EM61LX2 Data Logging System (DAS70-M2)
  • Page 34 Left sensor is shown at the top of the screen and panel corresponding to the right sensor is located below (both are labeled L and R). Readings display scale is shown as a colour bar in the Geonics Limited...
  • Page 35 (above the profile window). Labels L and R indicate corresponding sensors. If instrument with one sensor is selected in the System Setup dialog then modulated ribbon and profiles will be displayed in single widows. EM61LX2 Data Logging System (DAS70-M2)
  • Page 36 (Differential Global Positioning System) indicates that GPS readings are differentially corrected in real time, while label AGPS (Autonomous Global Positioning System) indicates lack of differential correction. On the right side of DGPS or AGPS label two green and white circles alternate. These Geonics Limited...
  • Page 37 Monitor mode and returns the program to Main Screen, Offset Nulling (perform nulling func- tion and calculates offsets), Remove Nulling (removes offsets), Toggle Channels (toggle displayed channels selection), Setup Alarms (opens dialog where alarm type and parameters can be selected). EM61LX2 Data Logging System (DAS70-M2)

  • Page 38: Description Of Monitoring Mode Options

    Off a message "No Communication, trying" will be displayed in numeric values window. The message is highlighted by red background to alert operator as fast as possible. The EM61LX2 will try to re-establish communication and after the problem is corrected the program will start com- munication automatically.
  • Page 39 It is "Undo" function for above Nulling procedure. After the option will be executed all calculated Null Offsets (for each channel and sensor) will be reset to zero. In order to avoid accidental touch on the button a confirmation dialog is displayed before the Remove Null procedure. EM61LX2 Data Logging System (DAS70-M2)
  • Page 40 A message in numeric window will display Calculating, this stage lasts about 10 to 12 sec- onds. When done a message displaying calculated Filter Factors for Left and Right sensors will be displayed (4th Figure below). New values can be accepted or previous factors can be restored by pressing the Cancel button. Geonics Limited...
  • Page 41 EM61LX2 Data Logging System (DAS70-M2)
  • Page 42 To ignore an entry and return to Stand By mode tap the Cancel (X) button or press Esc key, the dialog window will disappear and measurements can be continued. Toggle Channels Toggles between Channels E (Early)and L (Late), and Channel F (Filtered Channel) display modes. Geonics Limited...
  • Page 43 TAB key and then by using up or down arrow keys select one of the three available items: Disabled, Voice Indication, and Ringing. EM61LX2 Data Logging System (DAS70-M2)
  • Page 44 To return to original settings (state before this dialog was selected) tap the Cancel button. All parameters will not be updated. Geonics Limited...
  • Page 45 Figure below presents visual alarm for both Left and Right coils, and figure that follows show visual alarm for the Left coil only. Exit (exit Monitor mode) After tapping Exit button (or executing this option using keyboard) the program immedi- ately returns to Main Screen. EM61LX2 Data Logging System (DAS70-M2)

  • Page 46: Stand By Mode

    EM61-LX2 readings (in numeric form) are updated in Stand By mode approximately 10 times per second. Data shown in the plot area (modulated ribbon are profiles) are updated only during Logging mode when data are actually saved in the data file. Geonics Limited...
  • Page 47 Off a message "No Communication, trying" will be displayed in numeric values window. The pro- gram window in Stand By mode and the alert message is shown below. The message is highlighted by red background to alert operator as fast as possible. The EM61LX2 will try to re-establish com- EM61LX2 Data Logging System (DAS70-M2)

  • Page 48: Logging Mode

    Off a message "No Communication, trying" will be displayed in numeric values window. The mes- sage is highlighted by red background to alert operator as fast as possible. The EM61LX2 will stop collecting data and will try to re-establish communication. After the problem is corrected the pro- gram will re-start communication automatically.

  • Page 49: Stand By Mode Field Options

    Click on the GO button, or while using the keyboard press shortcut key <G> or if the button is a default button (highlighted) press <ENTER>. The logging window in Stand By mode will change to Logging mode and logging data starts immediately. EM61LX2 Data Logging System (DAS70-M2)
  • Page 50 It is "Undo" function for above Offset Nulling procedure. After the option will be executed all calculated Null Offsets (for each channel and sensor) will be reset to zero. In order to avoid accidental touch on the button a confirmation dialog is displayed before the Remove Null procedure (Figure below). Geonics Limited...
  • Page 51 (name) and associated line parameters (Line Increment, Line Sequence, Direction, Start Station, and Station Increment). The new line number and associated parameters are prompted by the program based on parameters specified in the Survey Setup menu. EM61LX2 Data Logging System (DAS70-M2)
  • Page 52 After the Alarm Setup item was selected in the pop up menu the Alarm Setup dialog win- dow appears on the screen. The dialog is presented below. Please refer to chapter 3 and section 6.1 (above, in this chapter) where this dialog and its parameters are described in detail and more figures are provided. Geonics Limited...
  • Page 53 Enhanced Alarm set must be reached together to trigger alarm. Minimum and Maximum The target response amplitude must be between Minimum and Maximum specified levels in mV to trigger alarm. EM61LX2 Data Logging System (DAS70-M2)
  • Page 54 The Reading Scale dialog will be displayed. It contains two text boxes for Minimum and Maximum values of a new scale for profile plot. Current settings (minimum and maximum values) for the scale are displayed in the bottom right and top right corners of the plot area. Geonics Limited...
  • Page 55 Stand By mode. To return to Stand By mode and current display options (state before this dialog was se- lected) tap the Cancel button and the dialog window will disappear. EM61LX2 Data Logging System (DAS70-M2)

  • Page 56: Logging Screen Layout In The Portrait Display Orientation

    The program detects the computer display orientation and adjusts its layout automatically. However, it is very important to fix the display orientation (in Windows Settings) to either mode. The program cannot trace screen rotation and adjust its layout during data collection. Geonics Limited...
  • Page 57 EM61LX2 Data Logging System (DAS70-M2)
  • Page 58 Geonics Limited...

  • Page 59: Description Of Data File In Em61Lx2 (L61) Format

    Appendix A A.1 Description of Data File in EM61LX2 (L61) Format Each record contains 24 characters, including line feed at the end of each record. Header of the file (contains 9 records starting with characters E, H, G, O, O, O, O, I, I)
  • Page 60 Left Coil - ChLE and ChLL) Comment 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Comment (maximum 11 characters) Time Stamp in ms (10 digits) Geonics Limited...
  • Page 61 Each GPS record (GGA Message) is broken in to several 22 characters strings and placed in the EM61LX2 data file which contains 24 characters records, including one character indicator and line feed at the end of each record. The GPS sequence starts at the line which contains character @ as the first character, then records that contain continuation of the same message start with character #.

  • Page 62: Conversion Factors

    A.2 Conversion Factors EM61LX2 has four channels. Channels LE and LL (Left Early and Left Late) for the Left Coil and channels RE and RL (Right Early and Right Late) for the Right Coil. If one coil is used then data is placed in fields for the Left Coil and data for the Right Coil are to be ignored.
  • Page 63 Table of Ranges Determined by the EM61-LX2 Microprocessor HEX Ch1 HEX Ch1 HEX Ch1 EM61LX2 Data Logging System (DAS70-AR2)

  • Page 64: Example Of File In Em61Lx2 Format

    A.3 Example of Data File in EM61LX2 (L61) Format The EM61LX2 data file records are written in binary format, therefore the file may have different shape when displayed or printed, depending on particular video or pronter settings. EM61LX2 V110GRD000 H 101822A 0.200...

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