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Geometrics G-858BP Operation Manual

Cesium vapor magnetometer
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G-858BP Backpack Mag
Cesium Vapor
Magnetometer
Operation Manual
COPYRIGHT © DECEMBER 2010
P/N 25271-OM
Rev. A
GEOMETRICS, INC.
2190 Fortune Drive, San Jose, CA 95131 USA
Phone: (408) 954-0522
Fax: (408) 954-0902

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  • Page 1 G-858BP Backpack Mag Cesium Vapor Magnetometer Operation Manual COPYRIGHT © DECEMBER 2010 P/N 25271-OM Rev. A GEOMETRICS, INC. 2190 Fortune Drive, San Jose, CA 95131 USA Phone: (408) 954-0522 Fax: (408) 954-0902...

  • Page 3: Ec Declaration Of Conformity

    Sunnyvale, CA 94089 USA ph: (408) 734-4616 FAX: (408) 745- 6131 declare under our sole responsibility that our portable magnetometers, models G-858BP to which this declaration relates are in conformity with the following standards: EN61010-1 :1993/A2: 1995 per the provisions of the Low Voltage Directive...
  • Page 4 Warning This is a Class A product. In a domestic environment this product may cause radio interference in which case the user may be required to take adequate measures.

  • Page 5: Table Of Contents

    CHAPTER 2: ASSEMBLY AND SET UP ............6 Unpacking your G-858BP ........................6 Assembly of the Pack Frame components ....................8 Stowing the G-858BP Console on the Pack Frame ................10 Cesium Sensor Adjustments ........................10 Installing the NovAtel Smart Antenna GPS™ mast ................15 Battery Installation ..........................
  • Page 6 Setting up the survey ..........................45 Defining the Survey Area ........................46 The following provided examples of how to set up the G-858BP for varios surveys......47 MINING MAG MAPPED SURVEY MODE - PARALLES TO Y AXIS .......... 48 MINING MAG MAPPED SURVEY MODE - PARALLEL TO X AXIS .........
  • Page 7 G-858BP Backpack Mag Operators Manual Advanced Features ..........................59 CHAPTER 7: BASE STATION ................66 Setting up a Base Station Survey ......................66 Acquiring Data ............................67 CHAPTER 8: DATA REVIEW ................69 Chart Display ............................70 Data Review Menu ..........................71 CHAPTER 9: DATA TRANSFER ...............
  • Page 8 G-858BP Backpack Mag Operators Manual QC Warning Level: ..........................80 Audio Setup ............................. 80 Setting the Date and Time ........................82 COM Port Setup Menu .......................... 82 External RS-232 and Field Note Setup ....................83 Magnetometer Test ..........................85 CHAPTER 12: MAGMAP2000 SOFTWARE ............86 APPENDIX 1: SURVEYING PRINCIPLES ............

  • Page 9: Chapter 1: Introduction

    G-858BP Backpack Mag Operators Manual Chapter 1: Introduction Overview The model G-858BP Backpack Mag is a professional quality magnetic mapping tools offering exceptional speed and efficiency. The system can be configured for use in the both the geological survey mode (for producing detailed magnetic maps for...

  • Page 10: Features

    Operators Manual Features The G-858BP has been designed to greatly simplify magnetic surveying. All of its features are intended to speed up the surveying process and reduce the possibility of mistakes. Toward that end, the following features have been incorporated into the G-858BP: •...

  • Page 11: Modes Of Operation

    This is useful if you are using another PC to collect and process the data, for instance, when using the G-858BP from a mobile platform. Of course, you may also store the data inside the G-858BP, with or without real-time transfer.

  • Page 12: Magnetic Surveying Checklist

    The choice is left up to the operator which will become an easy decision with experience. 3. Note that if the G-858BP is to be operated in gradiometer mode (two sensors in vertical or transverse gradiometer configuration) the sensors must be mounted on the staff or on a non- magnetic cart only.
  • Page 13 GPS is not in use. 5. Check the operator for magnetic items and remove them. Using the G-858BP in the Search Mode, insure that the operator does not contribute an error greater than 1 nT in any direction. (Refer to the Applications Manual for Portable Magnetometers on Magnetometer CD, chapter 4 for a fast, simple, "magnetic swing"...

  • Page 14: Chapter 2: Assembly And Set Up

    G-858BP Backpack Mag Operators Manual magnetometers are loaded into MagMap2000 and the diurnal correction is applied on Export of the data to *.dat or *.xyz format (Surfer, MagPick or Geosoft formats). The *.dat file may be reimported into MagMap2000 to show the diurnally corrected data profiles.
  • Page 15 Used to download data to host PC, modify positions, software and write output files. Located on Mag CD. 54050-01 Shipping case For storage and shipping of the G-858BP pack frame, console, sensor, batteries, charger and other accessories Items included in G-858BP Ship Kit.

  • Page 16: Assembly Of The Pack Frame Components

    G-858BP Backpack Mag Operators Manual Power Connector Download Connector Sensor 1 Connector Sensor 2 Connector Figure 5 G-858 Connector Set Assembly of the Pack Frame components Remove the console from the special pocket enclosure, lift the Pack Frame and console free of the shipping container and set them on a table or clean surface.
  • Page 17 G-858BP Backpack Mag Operators Manual Figure 6 Store Console on pack frame for transport (Hands Free mode shown)

  • Page 18: Stowing The G-858Bp Console On The Pack Frame

    G-858BP Backpack Mag Operators Manual Stowing the G-858BP Console on the Pack Frame For setup and transport, it will be convenient to slide the 858BP console into the space above the battery box. Once the console is seated, tighten the vertical strap provided to keep it securely in place.
  • Page 19 G-858BP Backpack Mag Operators Manual Figure 8 World map showing highlighted Vertical Magnetic field zone (green section) for when the sensor should be mounted at 45 degrees to vertical. Figure 9 World map showing highlighted Horizontal Magnetic field zone (green section) for when the sensor should be mounted at 45°...
  • Page 20 G-858BP Backpack Mag Operators Manual Loosen the Sensor Clamp sensor knurled screw and push the sensor up until the bottom of the sensor is even with the clamp ring. Hand-tighten the screw. Then remove the clamp screw holding the sensor clamp to the sensor mast.
  • Page 21 Similar clamp arrangements are available for staff mounted sensor operation. Installing the G-858BP Sensor for Staff Operation Sensor Staff The sensor staff consists of 3 identical sections. The sections plug into each other, and are held in place by slide lock mechanisms.
  • Page 22 G-858BP Backpack Mag Operators Manual Follow the directions as shown above for the Back Pack mounting, install the sensor vertically, horizontally or at 45º depending on the angle of the earth’s field in your location. See Figure For operations in the far North or South (above 70º...

  • Page 23: Installing The Novatel Smart Antenna Gps™ Mast

    G-858BP Backpack Mag Operators Manual Once the staff, sensor, sensor clamp and counterweight are installed mount the staff assembly on the backpack using the Strap Hanger shown in Figure 13. This allows the staff weight to be supported on the Back Pack and on the operator’s hips rather than the shoulder.
  • Page 24 G-858BP Backpack Mag Operators Manual Figure 15 Remove Antenna mast from Pack Frame Make sure the GPS cable wrap is securely fitted around the cable to prevent branches and brush from hooking on the GPS cable assembly. (Note: appearance of wrap material may vary). The Novatel SmartAntenna GPS antenna is now provided with a connector brace (shroud is no longer supplied) to protect the antenna cable connector from branches and brush strikes.
  • Page 25 G-858BP Backpack Mag Operators Manual Figure 17 Insert Antenna Mast into clamp The finished pack frame assembly is shown at the left in Figure 14. Note that the sensor and GPS mast are separated by the greatest lateral distance and that the antenna mast has its associated covering.

  • Page 26: Battery Installation

    In this case you will check the voltage of the battery pack using the G-858BP console battery meter (you must turn on the G-858BP to see the meter reading). Recharge time is approximately 6 to 8 hours per battery. The battery may be recharged in the pack frame battery box using the standard charger cable.

  • Page 27: Adjusting The Pack Frame

    Reassemble the pack frame using the same bolts and nuts. Remember that any hardwa not supplied by Geometrics is possibly contaminated with ferrous materials and can cause magnetic contamination. Figure 19 Brass Bolts for Frame Adjustment...

  • Page 28: Putting On The Pack Frame

    Remove the left (facing forward) vertical console retaining strap. Open up both waist belt assemblies. Grasping the G-858BP console retaining straps and the right shoulder strap as shown, lift the complete assembly up an onto your right shoulder, making sure the G -859 Console doe not swing into any hard object.
  • Page 29 G-858BP Backpack Mag Operators Manual Connect the primary pack frame belt buckle about your hips and tighten the belt. The belt should sit above your hips to support the majority of the pack weight. Identify the secondary C onsole Waist belt and...
  • Page 30 G-858BP Backpack Mag Operators Manual Tighten Vertical Support Straps Pack Frame Waist Belt Thread Console Belt through slots Console Support Belt Figure 22 Securing Shoulder straps, console straps and waist belts.
  • Page 31 G-858BP Backpack Mag Operators Manual Figure 23 Pack Frame final assembly...

  • Page 32: Chapter 3: Console And Gps Operation

    Chapter 3: Console and GPS Operation G-858BP Console Operation The G-858BP console is pictured below. The slots in the spreader bar are designed to slip over the console belt. The holes are for attaching the front vertical shoulder straps. The connectors are for the power cable and I/O port (RS-232).

  • Page 33: Powering On And Off

    G-858BP Backpack Mag Operators Manual Plug in the Console and Serial I/O cables in to the console if not already connected and turn on the magnetometer by pressing the power button (latest versions of the console have the power button located in the upper center area of the display panel).
  • Page 34 Note: The gauges on the left of the display show the battery power and memory left in the G-858BP. You should keep track of these indicators. High-pitched sounds coming from the G-858BP are normal. Capacitors used on the internal circuit boards exhibit a piezo-electric effect, and create the buzzing noises.

  • Page 35: Setting Up The G-858Bp

    SIMPLE SURVEY MAPPED SURVEY BASE STATION DATA REVIEW DATA TRANSFER SYSTEM SETUP hh:mm:ss mm/dd/yy Memory free: 99.9% G-858BP Magnetometer menu. Setting up the G-858BP Select the SYSTEM SETUP from the main menu. You will then see the system setup menu.
  • Page 36 G-858BP Backpack Mag Operators Manual ---SYSTEM SETUP MENU--- AUDIO DATE & TIME COM PORT SETUP COM & FIELD NOTE SETUP MAGNETOMETER TEST Real time transfer: < DISABLE > Use COM1 port as: < ASCII CHARACTER LOGGER > < CONFIGURE >...

  • Page 37: Warming Up The G-858Bp

    Operators Manual Warming up the G-858BP After first powering up the G-858BP, it may take from 2 to 10 minutes for the unit to warm up and begin operating normally, depending upon the ambient temperature. Here is a recommended procedure for...
  • Page 38 Cold 2 Signal 2 Magnetometer Test Display. (Note G-858BP Gradiometer Console Mode shows both sensors) The exact display will differ depending upon how many sensors are installed, and how long the unit has warmed up. The unit is warmed up and operating properly when the Bright1 is maintaining a constant reading of 50%.
  • Page 39 G-858BP Backpack Mag Operators Manual System Setup Menu. To begin to explore the various modes of operation of the G-858BP, press the ESC key to return to the G-858BP Magnetometer menu and read the chapters that follow. ---G858 MAGNETOMETER V3.04--- Use arrow keys to select desired function.

  • Page 40: Gps Operation

    Smart V1 enabled GPS. This system operates well in most areas of the world although WAAS is not available in all areas (see below). The Smart Antenna or Smart V1 and the G-858BP logging console are preprogrammed at the factory for proper operation. No further interaction with the console interface is required although the Smart V1 does require that the owner contact Omnistar for subscription to the Differential Correction Serivce.
  • Page 41 Format Memory Erases the entire data memory of the G-858BP. All data in all files will be lost. If the system hangs up at some point, you may need to do this after power up to get the unit to behave properly.

  • Page 42: Chapter 4: Search Mode

    G-858BP Backpack Mag Operators Manual Chapter 4: Search Mode Search Mode In search mode, the magnetometer operates normally, displaying data and the woowee audio tones, but data is not stored in memory. This is useful for manually identifying anomaly locations, much as with a metal detector.
  • Page 43 G-858BP Backpack Mag Operators Manual Search Mode Adjust Menu. Master Volume Adjusts the over-all volume. 1 is softest, 9 loudest. Woowee Volume 1 is softest, 9 loudest Woowee Sensitivity Adjusts the amount the pitch of the woowee changes with varying field readings.

  • Page 44: Chapter 5: Simple Survey Mode

    Once the unit is reading properly in Search Mode, you are ready to begin your survey. If you are unfamiliar with magnetic surveys, please read Appendix 1 and the Applications Manual for Portable Magnetometers, shipped with your G-858BP. In simple survey mode, the unit keeps track of MARK and END LINE key presses in order to locate the position of the sensor readings.

  • Page 45: Setting Up A Simple Survey

    Note: The line and mark numbers begin at zero. This is the most common convention, and the one adopted in the G-858BP. It is important to remember this, as it is sometimes easy to get confused. The survey shown above has a total of 8 lines, starting with number 0.

  • Page 46: Acquiring Data

    G-858BP Backpack Mag Operators Manual Set to CONTINUOUS for continuous data acquisition at the rate given by the cycle time, set in the field below. In discrete mode, the unit will take and store a reading at each END LINE or MARK key press.
  • Page 47 G-858BP Backpack Mag Operators Manual The items shown on the acquisition display are as follows: Field: Displays the magnetic field reading. READY Indicates that the instrument is ready to acquire data. Data is not currently being acquired, however. Displays a quality check indication. This value grows for rapidly varying fields. If the value exceeds a threshold (set in the system setup menu or the adjust menu) a warning sound will be heard.

  • Page 48: Adjust Menu

    G-858BP Backpack Mag Operators Manual MARK: 10 PRESS ANY KEY TO CLEAR THIS MESSAGE THEN PRESS "MARK" TO START NEXT LINE PRESS "MENU" AND SELECT "EDIT LINE AND MARK" FOR EDITING To start the next line, you must first press any key to clear this dialog box, then press MARK as you start walking up the next line.

  • Page 49: Pop Up Menus

    G-858BP Backpack Mag Operators Manual Adjusts the amount the pitch of the woowee changes with varying field readings. QC warning volume 1 is softest, 9 loudest QC warning level Sets the threshold for the QC warning to be emitted. If the QC exceeds this threshold, the warning is sounded.

  • Page 50: Editing Data

    G-858BP Backpack Mag Operators Manual Editing Data Selecting EDIT LINE AND MARK from the adjust menu (above) will show the edit menu. SIMPLE SURVEY EDIT MENU You are currently going to: Line: Mark: GO BACK TO LAST POSITION: Line: Mark:...

  • Page 51: Viewing Data

    G-858BP Backpack Mag Operators Manual Mistakenly pressing END LINE instead of MARK in the middle of a line. After pressing END LINE in the middle of a line, press ESC to clear the dialog box. Then, press MENU, highlight EDIT LINE AND MARK and press ENTER. Next, highlight GO BACK TO LAST POSITION and press ENTER.
  • Page 52 G-858BP Backpack Mag Operators Manual Line: Line: Max Readings/Line: Map Display in Simple Survey Mode Data is shifted all the way to the right, with the oldest data shown on the left. The number at the lower left indicates the number of the left-most line, while the right hand number indicates the right-most line on the display.

  • Page 53: Chapter 6: Mapped Survey

    G-858BP Backpack Mag Operators Manual On the chart, coordinates are in units of marks. For example, a y-value of 3.5 indicates half way in between mark 3 and mark 4. Chapter 6: Mapped Survey. Introduction Mapped survey allows you to better specify and visualize the survey area than simple survey, and to move around within the area in a non-continuous fashion.

  • Page 54: Defining The Survey Area

    “Manually Entering a Position,” later in this chapter. Note: Remember that you are defining the way the coordinates are viewed on the display of the G-858BP. See the later section “Defining a Physical Area” for more details on how to define your survey.

  • Page 55: The Following Provided Examples Of How To Set Up The G-858Bp For Varios Surveys

    See Defining a Physical Area for more information. After the G-858BP accepts the values you have entered, the mapped survey main menu will reappear, with some new options:...

  • Page 56: Mining Mag Mapped Survey Mode - Paralles To Y Axis

    All surveys assume 100 by 100 units. Any rectangular dimension is acceptable. Represents the start and direction for the first line. Represents the G-858BP Console orientation. 858BP All above Mapped surveys will import into MagMap2000 2000 and result in correctly located data.

  • Page 57: Mining Mag Mapped Survey Mode - Parallel To X Axis

    All surveys assume 100 by 100 units. Any rectangular dimension is acceptable. Represents the start and direction for the first line. Represents the G-858BP Console orientation 858BP All above Mapped surveys will import into MagMap2000 200 and result in correctly located data.

  • Page 58: Acquiring Data

    G-858BP Backpack Mag Operators Manual Acquiring Data Either beginning a new survey or continuing an old one will bring up the map acquisition display. Next Position Line Mark 20.00 200.0 Last Position Line Mark 20.00 180.00 Going DOWN RS-232 in:...

  • Page 59: Acquire Menu

    G-858BP Backpack Mag Operators Manual Acquire Menu Pressing the MENU key will bring up the acquire menu. --- ACQUIRE MENU Next X = 24.00 Next Y = [ 100.00 Current Direction < DOWN > Full scale: < 50 > nT <...

  • Page 60: Displaying The Map

    G-858BP Backpack Mag Operators Manual Displaying the Map The map is displayed by pressing the MAP (.) key from the data display screen: grid points X 20.00 Cursor position 0.00 every 5th Readings displayed readings Cursor Map Display. Map is shown after two lines of data have been taken.

  • Page 61: Map Menu

    G-858BP Backpack Mag Operators Manual Map Menu From the map, the MENU key brings up the Mapped Survey Map Menu: --- MAPPED SURVEY MAP MENU Move to position 20.00 100.00 Show < EVERY > data point Mapped Survey Map Menu Move to position This allows you to position the cursor by entering a position.

  • Page 62: Viewing Data

    G-858BP Backpack Mag Operators Manual Viewing Data Data profiles may be reviewed by pressing the CHART (-) key. The arrow keys will scroll through the data. Pressing the SCALE or MENU keys will allow you to adjust the scale. Each line is plotted in its own lane. Values “wrap around” inside the lane. The scale may be set by pressing the scale key, or by pressing menu and bringing up the Chart adjust menu.

  • Page 63: Editing Data

    G-858BP Backpack Mag Operators Manual Set the full scale of each lane, in nT. Zoom to show portion of line Sets the vertical scale of the display. Editing Data Introduction Data editing may be done in two ways. The most-recently taken data may be deleted and retaken, or you may simply retake data from anywhere within the survey.

  • Page 64: Examples - Recovering From Common Mistakes

    X axis perpendicular to that. Then the coordinates will be displayed on the G-858BP in the way most people are used to seeing x and y axes, with the y axis being vertical, and the x...
  • Page 65 G-858BP Backpack Mag Operators Manual Line No. X Coordinate Mark Key Press Line Key Press For this case, the lower left coordinate that you should enter in the Define Map Menu would be (0, 0), and the upper right would be (70, 80). The line spacing is equal to 10, and the mark spacing is equal to 20.
  • Page 66 Please note that the G-858BP allows you complete freedom in where to start your survey, even though the lines always must move from left to right on the display. You can always rotate the G-858BP until the line direction is up and down, and the lines move from left to right. This rotation will determine what coordinate you must enter as the lower left and the upper right of the display.

  • Page 67: Advanced Features

    Software States Before discussing the advanced features, it will be helpful to define some states the G-858BP can be in, in order to explain when certain operations will work. There are 3 active states of the G-858BP in continuous mode: Acquire State.
  • Page 68 3. End a line at a specified location Before going out in the field with your G-858BP we strongly suggest that you experiment with this example and observe what happens. This will save much potential confusion out in the field.
  • Page 69 This is because you pressed the PAUSE key when you reached the stream walking up line 6. This puts the G-858BP into Pause Mode, and a second PAUSE key press is used to resume data collection. Read the text at the bottom of the Acquisition Display to determine if you are in Pause Mode.
  • Page 70 (press ESC from the map). Pressing the MARK key will begin data storage. Note: Novices to the G-858BP should not attempt this procedure. Another way to do this is to define a new file number, as if this were an unrelated survey.
  • Page 71 G-858BP Backpack Mag Operators Manual X Coordinate Mark Key Press Line Key Press New Lines Original Lines For the first part of the survey, you would have defined the grid as follows: Lower left corner X= 0.0, Y = 0.0 Upper right corner: X = 70, Y = 80.0...
  • Page 72 The readings taken for the previous grid are shown. The extent of the map covers only the current grid. However, all data previously taken is still stored in the G-858BP. You are now ready to survey the new lines in the normal fashion.
  • Page 73 G-858BP Backpack Mag Operators Manual Example 2 You may also wish to take lines in perpendicular directions. Consider the survey shown below. X Coordinate Mark Key Press Line Key Press For the first part of the survey, define the grid as follows: Lower left corner X= 0.0, Y = 0.0...

  • Page 74: Chapter 7: Base Station

    G-858BP Backpack Mag Operators Manual Chapter 7: Base Station In base station mode, the unit will not keep track of changes in position. This is most useful when the unit is being used to collect data for diurnal correction of another, roving, unit’s data. This procedure is accomplished in the post-processing of your data, using the MagMap2000 program.

  • Page 75: Acquiring Data

    G-858BP Backpack Mag Operators Manual Sets the time interval between readings. Also sets the measuring interval. Increasing the measuring interval will increase the sensitivity of the magnetic reading. Setting the cycle time to greater than 1.5 seconds will change the time between readings, but will not affect the sensitivity.
  • Page 76 G-858BP Backpack Mag Operators Manual Scale Key Pressing the scale key will bring up an scale adjust indicator. Then the up and down keys will adjust the speed of the sweep (readings shown per page), while the right and left arrows will adjust the full scale...

  • Page 77: Chapter 8: Data Review

    17:52:23 04/24/03 Memory Free 99.9% This menu shows the directory of each survey stored in the G-858BP. Scrolling the file number will scroll through the files. Selecting DO DATA REVIEW brings up the chart display for the selected file number.

  • Page 78: Chart Display

    G-858BP Backpack Mag Operators Manual Chart Display The chart display varies slightly depending upon whether the survey is a simple survey, mapped survey, or base station. Cursor line number Cursor mark coordinat Coordinate of top of display 4.00 4.00, 0.75 0.00...

  • Page 79: Data Review Menu

    G-858BP Backpack Mag Operators Manual Time of reading 15:18:45 15:20:05 15:19:25 15:19:05 15:19:45 15:20:25 Chart Display for Base Station The chart display shows profiles of 5 lines of data at a time. The vertical position of the display window is shown on the upper and lower left of the display. The upper right corner shows the x and y position of the cursor.

  • Page 80: Chapter 9: Data Transfer

    Allows transfer of data in binary format. Data will be downloaded under the control of the MagMap2000 program on your PC. You must select this option on the G-858BP console, then select download from the MagMap2000 program. See Chapter 11, for details on running MagMap2000. You will also need to know which file number you want to transfer.

  • Page 81: Manual Ascii Transfer

    G-858BP Backpack Mag Operators Manual Select this option, then run the MagMap2000 software. There, under the Import item of the main menu, you will find options for downloading data. See chapter 11 for more details on running MagMap2000. Manual Ascii Transfer...

  • Page 82: Chapter 10: Gps Programming

    Format Memory Erases the entire data memory of the G-858BP. All data in all files will be lost. If the system hangs up at some point, you may need to do this after power up to get the unit to behave properly.

  • Page 83: Novatel Smart Antenna Setup Version 1.2

    Turn off the battery box GPS power switch. Connect the 25358-20 cable between the GPS serial cable wired into the pack frame (disconnect the serial cable from the G-858BP console) and a serial port on the computer. Turn on the battery box GPS power switch Start the StarView software.
  • Page 84 GPS system. GPS receivers will send data out in many formats, and you must know what commands will tell it to give you the data you wish. You may then program the G-858BP to send these commands to the GPS receiver.

  • Page 85: Using Gps Data

    The 21 at the beginning of the line indicates this string came in the RS-232 port of the G-858BP. The string is followed by a date and time stamp from the G-858BP. This may be used to correlate the positions with the magnetometer readings, which are also time stamped.

  • Page 86: Audio

    ASCII data transfer. The setting will not affect whether or not data is stored inside the G-858BP. The options here are 'DISABLE' and 'ENABLE'. When EM-61 data is being acquired this should be set to 'DISABLE'. Sending data in real time to the EM-61 causes the EM-61 to report a huge[*] number of errors.

  • Page 87: Serial Port (Use Com 1 As:)

    ASCII characters are interpreted as keypad presses. Using your favorite communication package on your PC, you can send key presses to the G-858BP. The built-in Microsoft Windows accessory Terminal works fine. See the section below How to Download Commands from the PC.

  • Page 88: Storing Serial Data (Store Serial Data:)

    QC Warning Level: This sets the level above which the QC will causes a warning tone to be sounded. Audio Setup There are several audible indicators on the G-858BP. Selecting AUDIO will bring up the following menu. AUDIO SETUP MENU Master Volume <...
  • Page 89 G-858BP Backpack Mag Operators Manual Metronome Volume < > Metronome cadence (Beeps/min) [ 60 ] Woowee volume < > Woowee sensitivity < > Warning volume < > QC warning volume < > Mark/line key event volume < > Master Volume This field adjusts the level of all the sounds.

  • Page 90: Setting The Date And Time

    G-858BP Backpack Mag Operators Manual Setting the Date and Time Selecting DATE & TIME form the System Setup Menu will bring up the following display. DATE AND TIME MENU Date Month: Day: Year: [ 95 ] Time Hour: [ 13 ]...

  • Page 91: External Rs-232 And Field Note Setup

    G-858BP Backpack Mag Operators Manual 4800 9600 19200 15200 The factory default is 9600. External RS-232 and Field Note Setup Selecting this item will bring up the following menu: --- EXT RS-232 & FIELD NOTE SETUP --- Assign key <...
  • Page 92 G-858BP Backpack Mag Operators Manual How to Download Commands from the PC Use your favorite ASCII text editor (DOS Edit or Windows Notepad are easy and readily available) to create a file as shown below: G859CMD,00,$PASHS,NME,SAT,A,ON G859CMD,01,$PASHS,SPD,B,2 G859CMD,02,$PASHS,RTC,REM,B G859CMD,03,$PASHS,RTC,BAS,A G859CMD,04,$PASHS,RTC,TYP,9,1...

  • Page 93: Magnetometer Test

    G-858BP Backpack Mag Operators Manual Magnetometer Test The magnetometer test brings up the following display: --- MAGNETOMETER TEST --- Magnetometer Signal Magnetometer Not Installed Battery Lithium Bright Cold Signal Magnetometer Test Display. The first two lines, showing the status of the sensors, are very useful to watch if no signal is seen, and during system warm-up..

  • Page 94: Chapter 12: Magmap2000 Software

    Operators Manual Chapter 12: MagMap2000 Software The MagMap2000 software program provides the G-858BP user with data downloading and editing capability. Acquired data is downloaded via high speed RS-232 communications link and then manipulated to generate or edit interpolated X-Y or GPS position information. A primary application included is the ability to apply diurnal correction from a base station.

  • Page 95: Appendix 1: Surveying Principles

    G-858BP Backpack Mag Operators Manual Appendix 1: Surveying Principles This section outlines the principles of performing a magnetic survey for anomaly location. It covers setting up, performing the survey and location of items of interest within the anomalous zones. Regional or geologic surveys for mineral exploration require a different set of procedures and are not covered in this overview.

  • Page 96: Diurnal Correction

    Note that the high measurement rate of the G-858BP allows a rapid walking speed along the profile line. Thus, even large target anomalies are covered within tens of seconds, reducing the potential Diurnal effects.

  • Page 97: Survey Accuracy

    G-858BP Backpack Mag Operators Manual be large in amplitude and extend for many miles. Usually it is more effective to complete the survey at night when these noise fields are greatly diminished. Survey Accuracy Commercial survey specifications may allow an “off line” error of up to ±20% (or more) of the line separation.

  • Page 98: Location Of Small Objects Within Associated Anomalies

    3-D map showing each of the peaks and valleys with the perspective of depth. Generally, a high and low pair (monopole) will stand out from the rest of the peaks and if these peaks are relocated using the G-858BP, the object will be midway between them.

  • Page 99: Appendix 2: Csaz

    Appendix 2: CSAZ Cesium Sensor Azimuth Program CSAZ is a program written by Geometrics for users of Cesium magnetometers. The purpose of the program is to determine the proper orientation of the Cesium sensor at various Earth field dip angles (field inclination).

  • Page 100: Appendix 3: Advanced Information

    This file has the .BIN extension, and is a raw dump of the data contained inside the memory of the G-858BP. This data is not stored in a user readable format. It is compressed in a manner unique to the requirements of the operation of the G-858BP.
  • Page 101 // time of day minutes, seconds, hundredths, month, // date day, year, status ); // G-858BP internal information. Example: 49881.953 49874.396 11:02:08.60 06/01/95 TYPE 3: Position events. fprintf(pAscFile, "%-2u %12.2lf %12.2lf %.2d:%.2d:%.2d.%.2d %.2d/%.2d/%2.d %10ld %11ld %11ld %3u\r\n", type, // 3 in this case...
  • Page 102 // Number of readings since last position Line, // Line number Station, // Mark Number Status, // G-858BP internal information. Positions ); // Number of positions since last discontinuity Example: (some blanks omitted to fit onto a single line) 26.00 0.00 11:02:08.70 06/01/95 TYPE 9: Pause event fprintf(pAscFile, "%-2u %.2d:%.2d:%.2d.%.2d %.2d/%.2d/%2.d\r\n",...
  • Page 103 G-858BP Backpack Mag Operators Manual TYPE 21: RS-232 event fprintf(pAscFile, "%-2u %s %.2d:%.2d:%.2d.%.2d %.2d/%.2d/%2.2d /4d% /1d%\r\n", type, // 21 in this case input_string, // ASCII string received from RS-232 hours, // time of day minutes, seconds, hundredths, month, // date...

  • Page 104: I/O Connector Pinout

    G-858BP Backpack Mag Operators Manual I/O Connector Pinout There are 3 inputs on the I/O connector which simulate END LINE, MARK and ENTER key presses. Momentarily connecting the corresponding pin to pin 4 is equivalent to pressing the key on the...

  • Page 105: Field Notes

    -R0 ... The options tell the program not to extract everything except the field notes. They are a dash, a letter, and the numeral zero. You will now have created a file of the field notes, along with some G-858BP formatting information. Lines will be as shown below: 33 Fell into a hole 10:59:14.80 06/01/95...
  • Page 106 G-858BP Backpack Mag Operators Manual To convert these back to normal EM-61 values you simply calculate: Y = 4(X-50000)/125 Where: X is the reported value in nT Y is the correct EM-61 value MagMap2000 does not yet contain this calculation.

  • Page 107: System Specifications

    G-858BP Backpack Mag Operators Manual SYSTEM SPECIFICATIONS Software: Supplied as part of the basic system for MAGNETOMETER / ELECTRONICS installation in the Geometrics or client-supplied PC, Operating Principle: Self-oscillating split-beam and including functions for: Cesium Vapor (non-radioactive CS-133). Operating Software: Operating Range: 18,000 to 95,000 nT (γ)
  • Page 108 Geometrics G-858BP Operators Manual Index Acquire state, 59 Format memory, 33, 74 Power key, 25 Adjust menu Function calls, 27 Ready state, 59 search mode, 35 Grid, re-defining, 62 Real-time transfer, 66, 78 simple survey, 40 I/O Connector, 96 RS232 Setup, 78, 83...

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