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Geometrics G-858, Operation Manual

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G-858BP Backpack Mag 

 

Operators Manual 

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).  The cesium sensor is hard wired into the console. 
 
 

The upper left connector is the battery connector, the upper right is the serial I/O port, and the 

lower cable is a non-removable connection for the sensor. Note spreader bar attached to the bottom of the 
console.  This bar attaches the console to the Console Belt and the Console Support Straps. 

 

 

Channel 1 Sensor 
Connector 

RS-232 Port 
Connector 

Power Connector 

Channel 2 Sensor 
Connector 

 

 24  

 

Summary of Contents for G-858

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 2: ......

Page 3: ...of 22 July 1993 and EN 55022 1995 EN50082 2 1995 ENV 50140 1994 ENV 50141 1994 EN 61000 4 2 1995 EN 61000 4 4 1995 per the provisions of the Electromagnetic Compatibility Directive 8913361EEC of May 1...

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: ...ponents 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 18 Adjusting the Pack Frame 19 Putting on...

Page 6: ...APPED SURVEY 45 Introduction 45 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 PA...

Page 7: ...ed Transfer 72 Manual Ascii Transfer 73 Erasing a Data Set 73 CHAPTER 10 GPS PROGRAMMING 74 Overview 74 Collecting GPS Data 74 NovAtel Smart Antenna Setup Version 1 2 75 Interfacing with User Supplied...

Page 8: ...NCIPLES 87 Guidelines for Small Ground Magnetometer Surveys 87 Number of People 87 Survey Efficiency 87 Layout of the Survey Track 87 Diurnal Correction 88 Survey Accuracy 89 Survey Credibility 89 Loc...

Page 9: ...s Second it lets you review your X Y locations and your data during the survey Note GPS Latitude Longitude information is stored but not displayed The system presents a Quick Look to the operator of u...

Page 10: ...bility of defining X Y location and tracking position as readings are taken and base station for collecting data to be used for diurnal corrections GPS is stored in Simple Mapped and Base Station mode...

Page 11: ...ons in the supplied MagMap2000 software The console keeps track of which survey line you are on which mark position you are presently on Operator should verify the console position and later enter the...

Page 12: ...al survey boundary by at least 2 or 3 times the estimated target depth f Locate the survey area corners and reference them to other surface objects If the site will be relocated in the future it may b...

Page 13: ...operator is disrupted during data acquisition the G 858BP provides a Pause buttion and allows data to be deleted and or retaken 8 At the end of the survey download the data to your host PC using the...

Page 14: ...etometer Unpacking your G 858BP The instrument is shipped in a rugged wheeled reusable shipping container with each element carefully packed in an overlapping padded wrap or pouch Unlock the case and...

Page 15: ...ds the sensor to the staff 25349 02 Locking Sensor Staff Assembly Horizontal staff to hold the sensor in front of the operator and slightly above the ground 25369 11 Locking Strap and Clamp Assembly S...

Page 16: ...onsole 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 Remove the Sensor from its storage pocket in the front...

Page 17: ...G 858BP Backpack Mag Operators Manual Figure 6 Store Console on pack frame for transport Hands Free mode shown 9...

Page 18: ...r your area it will always mount it in that manner whether on the backpack or on the staff We suggest that you install and use CSAZ a companion program on the Magnetometer CD that shows you how you sh...

Page 19: ...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 side til...

Page 20: ...terally out to the right side of the pack frame as shown in Figure 11 and reinsert the sensor clamp screw and tighten This is the proper installation for vertical orientation of the sensor suitable fo...

Page 21: ...sections The sections plug into each other and are held in place by slide lock mechanisms Plug them together by aligning the knob with the slot in the shaft and joining the sections Then make a finger...

Page 22: ...d inclination or dip angle in your area or refer to the world maps above tilt the sensor 45 to the vertical For mid latitudes mount the sensor for vertical operation For those areas where the field in...

Page 23: ...Sensor Sensor Clamp for Staff Operation Installing the NovAtel Smart Antenna GPS mast The GPS antenna mast has been mounted inside the pack frame for shipping You must remove the antenna mast rotate t...

Page 24: ...ble 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...

Page 25: ...in the cable bag should you need it Effort should be made to limit the amount of exposed cable and subsequent snagging on branches which will occur during normal survey operations Stow as much cable...

Page 26: ...en cover Inspect the connectors in the battery compartment and on the battery and note that they are keyed so that they can mate in only one orientation Line up the keyed sections and firmly push the...

Page 27: ...netometer and moving the hardware under test near the sensor Typical goals are to have less than 0 5nT effect at 2 feet 0 6m from the sensor The brass bolts on the vertical frame poles should be adjus...

Page 28: ...from the transportation configuration above the battery and swing it out to the side Remove the left facing forward vertical console retaining strap Open up both waist belt assemblies Grasping the G...

Page 29: ...second vertica Console support strap and tighten both vertical console straps This will give vertical support to the console so that it is stable on the front of the body Figure 21 final assembly Figu...

Page 30: ...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 b...

Page 31: ...G 858BP Backpack Mag Operators Manual Figure 23 Pack Frame final assembly 23...

Page 32: ...tors are for the power cable and I O port RS 232 The cesium sensor is hard wired into the console The upper left connector is the battery connector the upper right is the serial I O port and the lower...

Page 33: ...may need to adjust the display contrast keys marked LIGHT and DARK in order to see the display The menu first shown is the Main Menu MAIN MENU V1 12 Use arrow key to select desired function Confirm wi...

Page 34: ...rature During the warm up period the unit may display an inoperative sensor message If this happens simply unplug the sensor and plug it back in or cycle the power of the G 858BP See the later section...

Page 35: ...numeric entry Moving through menus In this document selecting an item means highlighting it with the arrow keys and pressing ENTER Scrolling to a value refers to highlighting the field item and press...

Page 36: ...Month 04 Day 24 Year 03 Time Hour 12 Minute 01 Second 12 SET TO ABOVE VALUES 12 01 12 04 24 03 Date and Time Menu Enter the correct values in the numeric entry fields then highlight SET TO THE ABOVE...

Page 37: ...Use arrow keys to select desired function Confirm with ENTER SEARCH MODE SIMPLE SURVEY MAPPED SURVEY BASE STATION DATA REVIEW DATA TRANSFER SYSTEM SETUP 12 35 45 04 24 03 Memory free 99 9 G 858BP Magn...

Page 38: ...in an office or other indoor environment gradients are too high and the sensor signal will often not appear See the section earlier in this chapter for more information on sensor dead zones From this...

Page 39: ...URVEY MAPPED SURVEY BASE STATION DATA REVIEW DATA TRANSFER SYSTEM SETUP 12 35 45 04 24 03 Memory free 99 9 G 858BP Magnetometer menu The G 858BP also provides other Self Test functions that may be acc...

Page 40: ...ree meters 95 percent of the time There are no service fees to use the WAAS service Currently WAAS satellite coverage is only available in North America There are no ground reference stations in South...

Page 41: ...ock Memory Checks the system memory DO NOT DISCONNECT THE BATTERY DURING THIS TEST Doing this will result in loss of all data stored in the instrument Serial Port Checks the serial port You must attac...

Page 42: ...a display similar to that below SEARCH MODE Field 45674 23 DATA NOT STORED QC 0 09 Scale 50 Adjust MENU Example of Search Mode Display Note Data is not stored in Search Mode This is indicated on the...

Page 43: ...ith 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 Full Sc...

Page 44: ...eading 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...

Page 45: ...l hours or more it is strongly recommended that you set up a second magnetometer as a base station to be used to correct for the diurnal variations in the Earth s magnetic field Setting up a Simple Su...

Page 46: ...sing this number up to 1 5 seconds will increase the resolution Again beyond that the resolution will not increase Next Line Next Mark Where the unit expects you to start or continue the survey Note E...

Page 47: ...ARK or END LINE key press The unit will not be taking data yet To start data taking go to the starting or continuing point indicated on the display press the MARK key and start walking If you have est...

Page 48: ...on t forget the key press necessary to clear the dialog box The END LINE key is handy for this since it was the last key pressed If you forget to clear the dialog box the next MARK key press will not...

Page 49: ...right and left arrows will adjust the pitch of the woowee The audio adjust indicator will disappear after a few seconds Scale Key Pressing the scale key will bring up an scale adjust indicator Then t...

Page 50: ...he end of a line This is a fairly common occurrence and easily fixed First press PAUSE to halt the data acquisition Then press ESC to close the dialog box Press MENU then highlight EDIT LINE AND MARK...

Page 51: ...enu you may delete as many lines or segments as you wish all the way back to the beginning of the survey Summary Data editing in simple survey is somewhat like pressing backspace on a computer You can...

Page 52: ...Pressing ESC will exit the map display Chart Display You may review the data readings as profiles by pressing the CHART key You may scroll both the map and charts by hitting the left and right arrow...

Page 53: ...in a uni directional or bi directional default pattern Move to any arbitrary position within the survey area to take data Leave gaps in the survey where positions are inaccessible Observe on screen wh...

Page 54: ...ay use any units you like There are several things you must keep in mind when deciding how to define the survey and how you will be walking to cover the area First of all survey lines are assumed to b...

Page 55: ...vey main menu will reappear with some new options MAPPED SURVEY MAIN MENU Data Set Number 2 MAG EMPTY Survey Mode continuous With 0 2 S cycle time DEFINE MAP BEGIN SURVEY AT X 0 00 Y 0 00 Going UP 19...

Page 56: ...irection for the first line Represents the G 858BP Console orientation All above Mapped surveys will import into MagMap2000 2000 and result in correctly located data G 858BP 0 0 100 100 LL U 0 0 Y axi...

Page 57: ...pped surveys will import into MagMap2000 200 and result in correctly located data 100 0 LL 0 100 X axis UR 100 0 Start UP at 0 100 0 100 LL 100 0 X axis UR 0 100 Start DOWN at 0 0 NOT VALID FOR UNIDIR...

Page 58: ...key is pressed during data acquisition The PAUSE key will temporarily halt acquisition pressing it a second time will re start acquisition The top line of the display shows the position where you sho...

Page 59: ...for more information on using this feature If you are between lines you will be allowed to adjust both of these numbers You cannot however enter a line position which isn t on the regular grid To do...

Page 60: ...the map according to whether you have selected a unidirectional or bi directional survey The position indicated is where the unit thinks you should be walking toward where you will next press the END...

Page 61: ...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 Show data point It also allows you to re...

Page 62: ...the Chart adjust menu The chart display is shown below 100 00 0 00 0 00 50 00 Coordinate of top of display Cursor x y coordinate Coordinate of bottom of display Cursor Chart Display for Mapped Survey...

Page 63: ...r where you want when you are finished editing Thus if the default position of the cursor is not what you want you may simply use the map and cursor movement functions to reposition it You do not need...

Page 64: ...d the END LINE key This position will be at the exact end of the last data segment Next press ESC twice to move to the Acquisition Display Now walk back to where you pressed the END LINE key Press MAR...

Page 65: ...spacing is equal to 20 90 Degree Orientation Suppose however that you have already defined the x and y coordinates and do not wish to define the y axis as parallel to the line direction One good reas...

Page 66: ...om 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 en...

Page 67: ...to recording the current position control the transitions between the Ready and Acquire state They can therefore be used to start and stop data acquisition Press the MARK key at fiducial positions whe...

Page 68: ...ion out in the field Line Key Press Mark Key Press Line No 0 1 2 3 4 5 6 7 0 20 40 60 80 0 10 20 30 40 50 60 70 X Coordinate Y Coordinate Sample Survey Containing an Obstruction In the above example c...

Page 69: ...line 6 Note Notice that data taking was not resumed when the MARK key was pressed This is because you pressed the PAUSE key when you reached the stream walking up line 6 This puts the G 858BP into Pa...

Page 70: ...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 Data can t...

Page 71: ...70 Y 80 0 Survey along Y axis Line spacing 10 0 Mark Spacing 20 0 When you have finished the original survey the light dashed lines ESC back to the Mapped Survey Main Menu and select DEFINE MAP Then...

Page 72: ...ursor coordinates displayed on the chart display will be correct however Make sure the cursor is positioned where you want it to be Sometimes the cursor may not be shown as it is positioned out of the...

Page 73: ...long Y axis Line spacing 10 0 Mark Spacing 20 0 When you have finished that ESC back to the Mapped Survey Main Menu and select DEFINE MAP Then enter the following values Lower left corner X 50 0 Y 80...

Page 74: ...0 10 02 18 95 Memory Free 86 6 Base Station Main Menu Scroll to an empty file or select the base station file you wish to append data to The fields are as follows Read Mode May be set to TIMED or TRIG...

Page 75: ...MENU Base Station Acquisition Display To adjust certain parameters press the MENU key to bring up the adjust menu This will allow you to set the volume the scale the woowee pitch and sound level and c...

Page 76: ...ale 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 in nT Th...

Page 77: ...a particular file number DATA REVIEW MENU File 1 MAPPED SURVEY Start End Time Date X Y 01 38 45 03 03 95 0 00 0 00 02 40 34 03 03 95 100 00 100 00 File Size 471 Readings 115 DO DATA REVIEW 17 52 23 0...

Page 78: ...mapped survey or base station 4 00 0 00 4 00 0 75 Coordinate of top of display Coordinate of bottom of display Cursor Cursor line number Cursor mark coordinat Chart Display for Simple Survey 100 00 0...

Page 79: ...left of the display The upper right corner shows the x and y position of the cursor Data Review Menu Pressing the MENU key brings up the data review menu DATA REVIEW MENU Move to position Line 6 Mark...

Page 80: ...ansfer Menu This menu allows you to transfer data in either binary form or ASCII form ASCII data is human readable but takes about 100 times as long to download It is suitable only for the smallest fi...

Page 81: ...100 00 File Size 471 Readings 115 Baud Rate 9600 START TRANSFER 11 52 44 04 24 03 Memory Free 99 9 You may scroll through the file numbers to the desired data set Then select the baud rate Next you m...

Page 82: ...set up so that the GPS is not logged when in Pause or at the End of Line Again this is to maximize memory space The G 858BP may be programmed to send commands to the GPS receiver when certain keys ar...

Page 83: ...rea you must perform this additional step Select tool settings Deselect SVs from the main menu To track SBAS WAAS satellites select SBAS SVs and click on the Send button To track GPS satellites select...

Page 84: ...2 to an external navigation system 8 Observe the data transmitted by the GPS to verify correct operation a Click on Transfer Send Text File b Browse to D Example Scripts Notes Test_Scripts and select...

Page 85: ...positions from the file perform the following procedure First download the binary file using the MagMap2000 program If you wish you can also do any other MagMap2000 function such as locating the data...

Page 86: ...erial port is useful for controlling a GPS system Field notes are useful to mark any desired event Each string is associated with a particular key press During a survey pressing the key will cause the...

Page 87: ...the CONFIGURE line that appears below the GEOMETRICS MODULE LOGGER entry in the scroll list Up to two numbers with decimal points may be detected and logged as magnetometer field values Zero to three...

Page 88: ...ced in any of the acquire modes Search Simple survey Mapped survey the battery voltage from the EM 61 will be displayed as a three digit number in the upper left part of the screen The logging of the...

Page 89: ...pace Woowee volume The woowee is the audible indicator of field strength It is particularly helpful when searching for anomalies in Search Mode This sound is active only in continuous survey mode Woow...

Page 90: ...ORT SETUP from the System Setup Menu will display the following menu COM PORT SETUP MENU COM1 and COM4 PORT MODE 1 COM1 is RS232 I O COM4 is RS232 input COM2 and COM3 PORT MODE 1 COM2 is RS232 I O COM...

Page 91: ...mory Delete Command Pressing ENTER on this field will delete the entire command from memory Download all commands from PC You may download an ASCII file from your PC to set up the entire set of comman...

Page 92: ...orrespond to the number keys on the console The other keys are as shown below 10 MARK 1 5 CHART 11 LINE 1 6 MAP 12 PAUSE 1 7 ENTER 13 ESC 1 8 POWER 14 MENU Note The ASCII commands or field notes will...

Page 93: ...occurs due to high field gradients or the field being in a dead zone Signal Sensor is reading a valid signal Failed There was some problem in either striking the lamp or maintaining the desired bright...

Page 94: ...error correction and has an interpolator wizard to enable construction of interpolated data files can make a mag GPS file from GPS Time and Mag Time files The resulting data can be plotted a profiles...

Page 95: ...vey must include a close line spacing 1 2 m with precise tracking in both the X and Y directions diurnal correction 0 5 nT or better correction of heading errors from instrument and or operator mainta...

Page 96: ...shing a procedure to stop start pause and annotate the data This must be foolproof simple and fully coordinated with the data processing Note that the Magnetometer operator must be aware of what line...

Page 97: ...nsidering that this type of survey is primarily for detection location This is not the case however if the location errors substantially exceed 20 e g off by one or more line separations This amount o...

Page 98: ...elpful to produce a 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...

Page 99: ...clination The program is located on the MagMap2000 install disk included with the G 858BP Once MagMap2000 is installed CSAZ will also be installed A newly designed CSAZII program is available from our...

Page 100: ...s 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...

Page 101: ...or 2 if connected hours time of day minutes seconds hundredths month date day year status G 858BP internal information Example 0 49881 953 49874 396 11 02 08 60 06 01 95 0 TYPE 3 Position events fprin...

Page 102: ...Number Status G 858BP internal information Positions Number of positions since last discontinuity Example some blanks omitted to fit onto a single line 6 26 00 0 00 11 02 08 70 06 01 95 168 13 0 5 3...

Page 103: ...f 0 25ms set to zero every 0 1sec com com port from which this data string is received 0 COM1 1 COM2 etc Example 21 GPGGA 015009 00 3725 9975 N 12209 9992 W 2 4 002 5 00025 1 M 028 4 M 001 0000 65 18...

Page 104: ...ore that COM1 serial port is to be logged COM2 COM3 and COM4 are presented on the Power Connector Pin Number Function 1 28V 2 28V 3 COM4 RXD 4 COM3 RXD 5 COM2 RXD 6 COM3 TXD 7 COM2 TXD 8 GROUND 9 GROU...

Page 105: ...name you wish for the GPS data you must give it an extension The TXT extension is a suggestion however you may use what you wish R0 The options tell the program not to extract everything except the fi...

Page 106: ...using the G859 to log EM 61 data you may notice that the displayed numbers move in a more stepwise manner than it does when recording magnetic fields This is normal The EM 61 reports a 16 bit integer...

Page 107: ...All Survey set up functions e g survey profile number and direction station or GPS number 4 Survey monitoring functions e g total field noise level profile number x or xy coordinates Internal Clock Re...

Page 108: ...nu 29 31 Map display 52 Mapped survey 45 Mapped survey mode 3 Mark spacing 47 Memory test 33 Memory usage 92 Memory formatting 33 74 Menu items 26 Menus 26 Main menu 29 31 selecting items 27 Mode sear...

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