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55 

GSM19 Series Magnetometers - Version 7

 

 
 

 

GEM Systems, Inc. Advanced Magnetometers 

For more technical information, visit www.gemsys.ca 

5.5 WORKING WITH GRADIOMETER MODE (19G & 19GW) 

The gradiometer option is available in GSM-19G and GSM-19WG (Walking Gradiometer) units, 
and therefore this section refers only to these units.  

Both units enable you to measure the magnetic field gradient between two sensors. These systems 
measure and store the gradient between the sensors in nT/m as well as the magnetic field reading in 
nT obtained by the lower sensor. The difference is that the Walking Gradiometer records data 
continuously for linear interpolation and referencing of ground positions following the survey. 

5.5.1 Performing a Reading 

After the initial start-up procedures (refer to section 5.3), select the Survey mode from the 

Survey 

Menu

 as follows: 

 

SCREEN 44 

survey mode 

position       time     file 

  

cycle time    tuning     AC filter 
display     mode      text      ID   
connect   sensor  now  
029876 readings left 
mobile 

 

A-start      C-change                       

←

 

BF 

→

 

 

Press 

C-change

. The following screen is displayed. 

 

SCREEN 45 

 
A - mobile      B - base 
 
C - grad   
 

 

Summary of Contents for GSM-19

Page 1: ...Instruction Manual Manual Release 7 4 March 2008 GEM Systems Inc Advanced Magnetometers 135 Spy Court Phone 1 905 752 2202 Markham ON Fax 1 905 752 2205 Canada L3R 5H6 Email info gemsys ca Web http ww...

Page 2: ...S 22 4 3 1 Pinout of a 6 Pin Female Connector 23 4 3 2 Pinout of a 4 Pin Female Connector 23 4 3 3 Pinout on BNC Female Connector Fast or Walking modes 23 4 3 4 External Trigger Options 24 5 OPERATING...

Page 3: ...W Utility 69 6 DATA ORGANIZATION AND TRANSFER 70 6 1 FILES AND DIRECTORIES 70 6 2 DATA TRANSFER 71 6 2 1 Setting the RS 232 format 71 6 2 2 Transferring the Data 73 7 RECALLING DATA 76 7 1 SELECTING A...

Page 4: ...oint to Point Navigation 112 D 4 3 RS 232 Waypoint Transfer Point to Point Navigation 115 D 5 SURVEYING WITH GPS NAVIGATION 117 D 6 DGPS POST PROCESSING 121 D 7 CDGPS OMNISTAR GPS OPTION 124 APPENDIX...

Page 5: ...ity Overhauser effect magnetometer gradiometer designed for hand held towed or base station use Applications include geophysical geotechnical or archaeological exploration long term magnetic field mon...

Page 6: ...eters includes several models each with different features and options In addition each mode and option can be used in different ways resulting in a variety of combinations The purpose of this manual...

Page 7: ...ting the survey mode is the only way to create a new file You must do this after each survey so that you can continue with following lines or survey blocks i e depending on the way you run your survey...

Page 8: ...picket marking screen This is the screen enables you to annotate UTM values in the magnetometer s output file at designated locations What happens with Walking mode is that you can mark pickets at de...

Page 9: ...tings as shown on the display For walking mode you should see settings such as 0 5 sec 1 0 sec 2 0 sec etc 1 1 4 Setting the Tuning AC Filter and Display Mode With an advanced magnetometer there will...

Page 10: ...Move the cursor to the display mode item and select C change The system shows the display mode screen and the current setting either text or graph If you Select text and F ok the system automatically...

Page 11: ...m displays the lane guidance and grid setup screen You have the option of changing the setting from no to yes as required Generally you want to have lane guidance active so use C change to set the val...

Page 12: ...from this screen and return to the GPS screen You are now ready to survey 1 1 6 Starting a Reading Surveying and Stopping Recording In this section we quickly review the steps involved in actually acq...

Page 13: ...n 41 Use C change number to change the identifier of the file you want to dump if you need to see which files are in the mag use the C info C file review function first When finished press F ok The sy...

Page 14: ...2898934 485692178 62899600 485689000 62892700 485687200 Note When creating files for waypoints transfer it is important to make sure that there are no empty headers or strings characters at the beginn...

Page 15: ...eters For more technical information visit www gemsys ca 5 Press the Next button and follow the instructions on the screen for setting up the magnetometer to receive waypoints 6 Then press Next The sy...

Page 16: ...be concurrent with other intervals of measurement Keeping the RF on all the time increases the maximum data sampling rate to 5 Hz b Deflection A short pulse deflects the proton magnetization into the...

Page 17: ...ly the tuning of the instrument should agree with the nominal or expected value of the magnetic field for the particular region see Figure A1 in Appendix A You can set this tuning automatically or use...

Page 18: ...on SLOW cycling rates describe instruments that cycle from 3 seconds to 1 hour FAST reading rates describe instruments that cycle from 0 5 seconds to 1 hour i e include all SLOW reading rates By defau...

Page 19: ...dio Frequency RF resonator The liquid does not need to be refilled 1 coaxial sensor cable per channel typically RG 58 U and 206 cm long Up to 100m long cable is available optionally Over 20m we recomm...

Page 20: ...tions above ground during surveys For best precision the full staff length should be used Recommended sensor separation in gradiometer mode is one staff section 56cm although two or more sections are...

Page 21: ...r set of connectors on the unit s display and in this manual is referred to as lower while the upper set is referred to as upper 6 If you are using slow sensors optional make sure that you have one sh...

Page 22: ...oses To connect the charger For time synchronization and for diurnal correction use 6 pin to 6 pin cable connected from console to console For RS 323 data transfer either in Real time Transmission or...

Page 23: ...input for power PWR and input for power GSM 19 GSM 19G MAGNETOMETER GRADIOMETER UPR Upper polarization PLRZ Sends RF signal polarizes the upper sensor SNSR Sensor channel that receives UPR Upper sens...

Page 24: ...y charger E Ground common F external battery 11V to 15V NOTES External power applied to pin F does not charge the internal battery Voltage in excess of 15 volts in pin F may trigger an internal protec...

Page 25: ...open for most of the time Shorting A E for 10ms 50ms is recognized as a trigger 2 Using external voltage on pin A with E as ground Keep A at 5V to 12V most of the time Voltage falling to 0V for 10ms 5...

Page 26: ...4B 1L9 Canada tel 905 764 8008 fax 764 2949 www gemsys on ca info gemsys on ca bytes v7 0 10 IX 2000 4194304 Screen 1 displays the company address telephone fax e mail and website The bottom line disp...

Page 27: ...o OF off D test 15 II 00 E time synch 1 send TU 01 04 15 45 erase 2 enter text 13 2V From the Main Menu you can press the following to go to the menus shown on the right A Survey Menu see section 5 3...

Page 28: ...reverse video Pressing B moves the highlighted marker backward and F moves it forward Once the desired option is highlighted press C change to change its settings SCREEN 3 survey mode position time fi...

Page 29: ...your unit may differ from the ones shown here depending on its model its software and its hardware SCREEN 4 A mobile B base C grad D walkmag E walkgrad and select A mobile B base station C grad D wal...

Page 30: ...ircuits from water damage overheating etc The active survey mode and the number of readings that could be taken in that mode until the memory is full are also indicated on the screen NOTE The mobile m...

Page 31: ...the active one If you need to change it do so now before taking any readings The Selection for X Y coordinates looks like SCREEN 8 select positioning system XY each 9999999 to 9999999 or 9999999 99 to...

Page 32: ...in each direction that is added to present position after each reading EOL End Of Line increment i e added to the present X and Y if you press EOL see section 5 4 4 A list of available commands is sh...

Page 33: ...correct If you selected Line Station positioning system two screens are displayed one for the Line and the other for the Station settings SCREEN 12 LINE 00100 N F OK change A number B coordinates EOL...

Page 34: ...rdinals N NE E SE S SW W NW C changes station increment sign D changes station increment When you press A number D number or 0 number the following screen is displayed SCREEN 14 E enter C clear Here y...

Page 35: ...ion increment If you have too many readings and small station increments some interpolated stations have repeated values 5 3 3 Understanding the Line Station Positioning System N station station stati...

Page 36: ...increment and 0 y increment y S For clarity in the above diagram x axis is aligned EW and y axis NS but they could also represent any other grid The x increment is used in a mathematically correct wa...

Page 37: ...bers are still within range 5 3 5 Setting the Time In the Survey Menu press F to highlight time SCREEN 16 survey mode position time file cycle time tuning AC filter display mode text ID 13 V 96MO15 05...

Page 38: ...rs in 24h system mm minutes ss seconds When all of the digits are entered the unit displays the following screen SCREEN 18 F start clock Press F when you intend to start the time NOTE Units equipped w...

Page 39: ...on is fixed The prefix numbering ex 01 to 50 and the file extension are automatically assigned The file extensions are m for mobile and b for base see section 6 1 for more file extensions 5 3 7 Settin...

Page 40: ...of the LCD show immediate start correction with interpolation This means that once in survey mode pressing any button starts a reading immediately Because there is no waiting time the time stamps of t...

Page 41: ...its range for the initial tuning setting This scan is performed only once and before a reading is taken when entering the survey mode from this screen Once tuning is initialized the value of the tunin...

Page 42: ...e displayed on the next screen To store your selection press F ok If you selected tune initialize no at screen 22 the following screen is displayed SCREEN 24 57 tuning 19 131 microT F ok C change numb...

Page 43: ...tra filtering averaging or signal manipulation of any kind State of the art measuring algorithms and system design from the sensors to the electronics ensure the quality of the results In the few case...

Page 44: ...eld nT coordinates no text only a graph of the magnetic field is displayed during survey with no other text field nT the graph along with the magnetic field readout in big digits in upper left display...

Page 45: ...the survey with an empty screen The graph starts from the left side and the offset is set to 00 No Displays the last graph from memory and starts adding the new readings at the end of it After you ha...

Page 46: ...information visit www gemsys ca Real Range LCD Short Form 0 64nT 0 64nT 1 28nT 1 28nT 2 56nT 2 56nT 5 12nT 5nT 10 24nT 10nT 20 48nT 20nT 40 96nT 40nT 81 92nT 80nT 163 84nT 160nT 327 68nT 300nT 655 36...

Page 47: ...ve its own text including base mode You can recover the text later using SEND dumping data in a separate file or you can access it chronologically with the data 5 3 12 Changing the Magnetometer ID Num...

Page 48: ...make sure all cables and sensor s are connected This maximizes the lifespan of your system and protects internal RF circuits from water damage overheating etc With MOBILE survey mode selected press A...

Page 49: ...the reading is performed the following screen is displayed SCREEN 35 56 789 34 nT 12 34 nT 99 A menu 1 repeat same position other keys read L 100 N S 200 E where the first number 56 789 34 is Total Ma...

Page 50: ...can later be recovered with SEND 4 graph Is active only if graph mode is selected It allows to change the graph s scale and offset see section 5 3 8 C tune Leads you to the tuning setup screens see s...

Page 51: ...ed readings as needed i e without incrementing the position by pressing 1 repeat same position ALL repeat readings are automatically stored with the same coordinates and the actual time of the reading...

Page 52: ...anticipating that some individual readings may be noisier than desired Alternatively gradiometer units that are equipped with two channels may display upper if the upper channel is the active one or b...

Page 53: ...moving in the opposite direction he or she walked the previous one However if the next line starts at a different station number you may press A or B to change the current station number backward or...

Page 54: ...text 4 graph vertical scale C tune 5 display mode E EOL F OK 0 noise 1 info Then press 1 info The following screen is displayed SCREEN 43 up 2840zc 1200ms 2600 1600 lo 2780zc 1200ms 2500 1600 F This...

Page 55: ...s max measurement time was accomplished 0 means measurement was too short 0 1 2 3 4 5 6 7 8 9 1s 100 ms 200 ms 300 ms 400 ms 500 ms 600 ms 700 ms 800 ms 900 ms 900ms 0 5s 50ms 100 ms 150 ms 200 ms 250...

Page 56: ...t between the sensors in nT m as well as the magnetic field reading in nT obtained by the lower sensor The difference is that the Walking Gradiometer records data continuously for linear interpolation...

Page 57: ...r Sensor Spacing Press F to highlight sensors The following screen is displayed SCREEN 47 survey mode position time file cycle time tuning AC filter display mode text ID sensors 56 cm apart A start C...

Page 58: ...ode position time file cycle time tuning AC filter display mode text ID sensors graph A start C change BF Use C change to switch to the text or graph modes In graph mode you can plot either the Total...

Page 59: ...n a GSM 19G gradiometer is used in a single channel mode i e for magnetic readings only the lower sensor is used to take the readings but it is also possible to use the upper channel for this purpose...

Page 60: ...that could otherwise be obtained only with optically pumped systems can be achieved with excellent results Similar to an airborne survey in principle data is recorded at discrete time intervals normal...

Page 61: ...The following screen is displayed SCREEN 54 A mobile B base C grad D walkmag E walkgrad In this screen you have the choice of selecting the Survey Mode D for walkmag mode available on GSM 19W units E...

Page 62: ...set rate If in graph mode the last graph in the memory may or may not be displayed here depending on how the clear graph setting has been programmed see section 5 3 8 In any case press C walk again t...

Page 63: ...ribed in this section A new parameter sensors is shown in the survey menu and it is used to set the distance between the sensors For details refer to section 5 5 2 on Setting the Gradiometer Sensor Sp...

Page 64: ...screen is displayed SCREEN 63 56000 00 datum F ok C change number The number that appears on the screen is the one that was set by the last user You can change it by pressing C and set the desired num...

Page 65: ...adiometer mode and a Base Station unit in the survey to later perform diurnal correction you must synchronize their times 5 8 1 Setting the Time on the First Magnetometer First you have to set the rig...

Page 66: ...internal timers 5 8 2 Transferring the Time To transfer the time from the Main Menu press E time synch on EACH unit The following screen is displayed SCREEN 57 connect cable press C Connect the 6 pin...

Page 67: ...Station unit The diurnal correction is obtained from the following equation corrected field mobile field base field datum The Datum is just a positive shift of the corrected data It is normally set to...

Page 68: ...onnecting two units the Base readings are transferred to the Mobile file and stored in it This permanently modifies the original Mobile file and memory NOTE Because the flash memory chips cannot be ov...

Page 69: ...et base mag to main menu F 5 Press F 6 The software automatically searches the base for the file with the correct date and time and transfers its data 7 Press 1C to return to the main menu Version 5 a...

Page 70: ...Mobile files after you saved them on a disk Please refer to the help files provided with GEMLinkW for more information NOTE GEMLinkW is normally shipped with the new units in a CD ROM It is also avai...

Page 71: ...nsion File extensions include the following m mobile b base g gradiometer fmh fast mag hip chain fma fast mag auto cycle fgh fast grad hip chain fga fast grad auto cycle vX vlf only X represents the n...

Page 72: ...h as baud rates 6 2 1 Setting the RS 232 format Before transferring data you have to set the RS 232 format Once set the RS 232 format is saved in the memory From the Main Menu press C info SCREEN 65 F...

Page 73: ...ur option The unit returns to screen 66 Pressing F ok leads you to the selection of RS 232 parameters for Real time Transmission RTT When RTT is enabled the unit outputs the readings tagged with their...

Page 74: ...e to these parameters 8 data bits 1 stop bit no parity The slowest transmission rate for RTT is 19200 bps If RTT is not enabled the external triggering of the unit by the RS 232 line may not work prop...

Page 75: ...N 70 2 file F ok C change number If there is only a single file in the memory the system automatically shows screen 71 If there is more that one file in the memory you are prompted to select the file...

Page 76: ...select F Custom the system displays Screen 72 SCREEN 72 SEND format is X Y elevation nT nT m sq cor nT sat time picket x picket y A send C Change 1 To alter the order of data values position the curso...

Page 77: ...ese processes 7 1 SELECTING A FILE TO REVIEW From the Main Menu press C info The system displays the following screen SCREEN 73 F time B RS232 D dir C file review A remote 0 datum E channel 2 buzzer 3...

Page 78: ...y depending on the mode a in text mode the value represents the number 1 to 999 of readings to jump while scrolling through the data b in graph mode the value is the number 1 to 180 of screens 120 dot...

Page 79: ...rrected field and the value to the right is the corrected field On line 2 time of the reading hh mm ss s On line 3 date of the reading day month year On line 4 left Line and Station A displays an olde...

Page 80: ...ith an increment of 1 the left half of the graph becomes the right half and new data is plotted on the left side You is displaying half of the data already viewed on the right side of the screen With...

Page 81: ...The following screen is displayed SCREEN 82 000100N 000575E uncorrected field 00100N 0000125E A B C The upper right corner shows the coordinates of the right most readings The bottom left corner show...

Page 82: ...for continuous action F returns you to graph review When reviewing base files The upper left corner shows the time hhmmss of the left most reading The upper right corner shows the time of the rightmos...

Page 83: ...7 GEM Systems Inc Advanced Magnetometers For more technical information visit www gemsys ca A reduces the vertical scale B increases the vertical scale C moves the graph down D moves the graph up F r...

Page 84: ...is overwritten with blanks Once erased the data CANNOT be recovered IMPORTANT NOTE Use this function only if you want to clear the entire memory since all of the files is erased As a security feature...

Page 85: ...stems Inc Advanced Magnetometers For more technical information visit www gemsys ca SCREEN 87 please wait 010 of memory erased Press F when 100 of the memory has been cleared NOTE Units with 32MB of m...

Page 86: ...e firmware resides During this test the checksum of the existing data in the ROM is compared to the checksum stored in EPROM F buzzer sounds the internal buzzer intermittently provided it is enabled P...

Page 87: ...OTES To avoid hardware software incompatibility the source software files are released as required and normally named as the serial number of the unit with extension bin If you need to upgrade or want...

Page 88: ...ch keyboard 524288 bytes received 07183A4A erasing flash SCREEN 93 software upgrade in progress please do not touch keyboard 524288 bytes received 07183A4A flash erased verified SCREEN 94 software upg...

Page 89: ...should be periodically recharged see below 12 CHARGING THE BATTERY IMPORTANT The internal battery is 12V lead acid 2 0 Ah battery To maximize its lifespan you MUST maintain it in the following manner...

Page 90: ...sy though The sensor should be kept clean and free of ferromagnetic particles dust etc The liquid of the Overhauser sensors is sealed in a pyrex bottle Refilling is neither possible nor needed 14 WARR...

Page 91: ...IFFERENT SENSOR ORIENTATIONS A 1 1 Overhauser Sensor In equatorial regions the magnetic field direction should be considered horizontal and pointing north to south Here the GSM 19 Overhauser sensor ax...

Page 92: ...91 GSM19 Series Magnetometers Version 7 GEM Systems Inc Advanced Magnetometers For more technical information visit www gemsys ca Figure A1 Magnetic Field Intensity...

Page 93: ...92 GSM19 Series Magnetometers Version 7 GEM Systems Inc Advanced Magnetometers For more technical information visit www gemsys ca Figure A2 Magnetic Field Inclination...

Page 94: ...de is sent through the Rs 232 port as follows corrected time line station field nT field nT 122136 0 00000N 0000100E 57034 56 56977 87 99 122142 0 00000N 0000125E 57034 67 56977 84 99 Column 1 Time as...

Page 95: ...41645 0 Time as hhmmss s 0000N Line number and direction 0000100E Station number and direction 57137 66 Uncorrected magnetic field nT 57001 37 Corrected magnetic field nT 000N Slope degrees 21 4 First...

Page 96: ...ss s Column 2 Line number and direction Column 3 Station number and direction Column 4 Uncorrected magnetic field nT Column 5 Reduced magnetic field nT B 4 WALKING MAG OPTION Data obtained with the Wa...

Page 97: ...to use station interpolation for walk files keep in mind the number of readings and the distance between pickets by managing the cycling time and the station increment If you have too many readings a...

Page 98: ...abel the unit interrupts the cycling take the VLF reading and then prompts you to reassume the magnetometer cycle The walkVLF option is yet to be implemented in version 6 mags OPERATION NOTE The follo...

Page 99: ...VLF stations Enter 1 2 or 3 The stations used in the last survey if any is displayed SCREEN C3 17 1 19 6 24 0 F ok C change number Press F ok to accept or C change number select different stations To...

Page 100: ...es according to the following schedule Please note that this schedule is provided as complementary information and GEM Systems has no control over any changes that may have been implemented US NAVY VL...

Page 101: ...y Menu corresponding to the current survey mode SCREEN C6 survey mode position time file cycle time tuning AC filter text ID connect sensor now 018127 readings left mobile vlf A start C change BF From...

Page 102: ...in the form of the current positioning system When conducting the survey with the VLF option on the GSM 19 the quality of the incoming signal can be effectively determined by the field strength shown...

Page 103: ...SCREEN C8 A position B enter text 3 vlf C tune D delete E EOL f OK 0 noise 1 info Press 3 vlf and then C scan on the following screen SCREEN C9 B slope C scan D enter vlf stations F ok Other options a...

Page 104: ...how the direction the sensor should be rotated to correct the tilt C4 SIGN CONVENTIONS FOR IN PHASE IP AND OUT OF PHASE OP Measured components are vertical in and out of phase relative to the total ho...

Page 105: ...OTES The GPS antenna must be connected to the BNC connector MARKED WITH YELLOW located on the RIGHT HAND SIDE of the console Do NOT connect the GPS antenna into the BNC connector for the sensor RF on...

Page 106: ...lected the unit displays the GPS menu SCREEN D3 GPS menu A initialize GPS B navigation C synch to UTC D test E post processing no F NOTE E post processing is only visible on units equipped with DGPS p...

Page 107: ...command has been added to the GPS menu only for convenience Before starting or re starting a survey with the GPS enabled the GPS module is automatically initialized The survey does not proceed until a...

Page 108: ...the GPS data in bytes It is obtained by comparing the PPS and internal TCXO A value of 7 is normal Line 2 Displays date and time in UTC Line 3 0629231 4857210 0000174 represent UTM Easting Northing an...

Page 109: ...es are explained in the sections that follow D 4 1 Automatic Grid Setup Line to Line Navigation With the A automatic grid setup option you can generate a rectangular grid with parallel lines separated...

Page 110: ...e automatic grid generation and lane guidance features the coordinates in this navigation mode can be referenced to a Local Grid or to a Rotated Grid The Local Grid takes as its origin the START point...

Page 111: ...ws you to use smaller numbers or at least relevant to your origin or your grid To set the automatic grid first define the width of the lane SCREEN D9 lane width 05m F ok C change The available lane wi...

Page 112: ...number will default even if you change it You must choose an appropriate line spacing and enter it After the last value is entered the unit returns to the GPS menu To proceed with the survey press F...

Page 113: ...he distance in meters to the next waypoint is displayed In contrast to the automatic grid Programmable Waypoints is a Point to Point navigation mode NOTES The coordinate of the waypoints can ONLY be e...

Page 114: ...gation New Navigation Feature In August September of 2002 the navigation display was enhanced through the addition of a large directional arrow on the face of the LCD unit This feature is designed to...

Page 115: ...he available lane widths are 2 5 10 20 25 50 meters Press C change to toggle between these values and F ok to accept To define the grid enter all the parameters sequentially as they are requested usin...

Page 116: ...t is actually a tool to program the waypoints If the survey involves several waypoints programming them one by one using the unit s keypad may become quite a task Instead you may use the RS 232 port t...

Page 117: ...ine Lines terminated only with LF cannot be used since they are treated as a single line A general description of the file format follows Easting WPoint1 Separator Northing WPoint1 CRLF Easting WPoint...

Page 118: ...onnector MARKED WITH YELLOW located on the RIGHT HAND SIDE of the console Do NOT connect the GPS antenna into the BNC connector for the sensor RF on the left hand side The antenna will be damaged beyo...

Page 119: ...ion scrolling the cursor with B or F The current position is displayed in the selected system SCREEN D21 survey mode position time file cycle time tuning AC filter display mode text ID 0000268 0001 00...

Page 120: ...en displays SCREEN D22 survey mode position time file cycle time tuning AC filter display mode text ID 0000268 0001 0002 no GPS A start C change BF Press C change to change the positioning system SCRE...

Page 121: ...Check GPS lock and initialize GPS if necessary 2 Synchronize internal clock to UTC time time is overwritten 3 Perform tune initialize for magnetic readings if tune initialize is enabled 4 Display the...

Page 122: ...DGPS POST PROCESSING Units equipped with GPS and post processing option are capable of storing the binary GPS information required for the purpose When the magnetometer is in reading mode the require...

Page 123: ...ng a survey from the main menu a warning is momentarily displayed if post processing is disabled If you DO want to store DGPS data press 1C and enable post processing from the GPS menu Otherwise conti...

Page 124: ...GPS and with post processing option to a file on the PC Once initiated the process automatically checks for data integrity Checksums of the transmitted and received data and size of the files in byte...

Page 125: ...netometer on two different baud rates 115200 and 9600 After GPS powered up magnetometer attempts to establish communication with GPS on both baud rates and screen will show toggling of baud rates on t...

Page 126: ...125 GSM19 Series Magnetometers Version 7 GEM Systems Inc Advanced Magnetometers For more technical information visit www gemsys ca 3 GPS Menu Screen 1...

Page 127: ...screen 2 Depending on selection made by operator GPS will either select most appropriate mode of operation automatically operate as CDGPS SBAS or as OmniSTAR receiver Experience shows that normally wh...

Page 128: ...will be selected then one of four possible Canadian locations must be selected Screen 3 A East B East Central C West Central D West Depending on area selection one of four available L band satellites...

Page 129: ...go to GPS Menu 3 2 SBAS initialization If SBAS initialization option is selected then no other settings are required and console will automatically go to GPS menu 3 3 OmniSTAR initialization If OmniS...

Page 130: ...d geographical region and its frequency Forth line shows actual measured frequency of beam received by antenna and carrier to noise density ratio Fifth line is empty and reserved for future use Sixth...

Page 131: ...xplanation please refer to Table 2 Table 2 OmniSTAR VBS Status Word Courtesy of NovAtel Press F button to get to GPS menu 4 L band info To verify current status of L band based services as OmniSTAR or...

Page 132: ...to receive L band signal then screens 4 or 6 will come up for CDGPS or OmniSTAR respectively Lock time parameter will reflect length uninterrupted tracking of satellite signal 5 L 1 satellite info Pr...

Page 133: ...ordinates and elevation in meters above sea level Fourth line Local Grid Coordinates Fifth line Rotated Grid Coordinates Six line shows standard deviation of Easting Northing and Height in meters Seve...

Page 134: ...Kandawala Sri Lanka 31 LIBER Liberia 1964 32 LUZON Do not use See 72 33 MINDA See 73 34 MERCH Merchich Morocco 35 NAHR See 74 36 NAD83 N American 1983 Includes Areas 37 42 37 CANADA N American Canada...

Page 135: ...audi Arabia 75 NASP N American Caribean 76 OGBM Great Britain 1936 Ordinance Survey 77 OHAA Hawaiian Hawaii 78 OHAB Hawaiian Kauai 79 OHAC Hawaiian Maui 80 OHAD Hawaiian Oahu 81 OHIA Hawaiian Hawaii 8...

Page 136: ...s In case there are some GPS related technical insight questions please refer to NovAtel originated set of documents It includes technical specification options available e t c 1 OEMV family user manu...

Page 137: ...ted design for continuous monitoring of the Inclination and Declination and total field intensity of the Earth s magnetic field This system employs a mutually orthogonal coil setup that through a simp...

Page 138: ...are possible The measurement of two magnetic fields for determination of gradient is done concurrently with strict control of measuring intervals The result is a high quality gradient reading indepen...

Page 139: ...110 220 VAC 50 60Hz Output dual level charging Operating Ranges Temperature 40o C to 50o C Battery Voltage 10 0V minimum to 15V maximum Humidity up to 90 relative non condensing Storage Temperature 50...

Page 140: ...nted data Because a new file is created every time a base survey starts each schedule has its own file I 1 SETTING UP THE PROGRAMMABLE BASE STATION OPTION From the Main Menu press A survey to access t...

Page 141: ...ess A start to proceed NOTE If tune initialize is set to YES it is activated at this point Make sure the sensors are connected to the unit Otherwise tune initialization fails and this affects all the...

Page 142: ...reen is displayed SCREEN G4 base will start immediately A start E new mode The immediate mode is the normal manual base mode Pressing A start starts the survey and you must press 1C to stop it I 3 USI...

Page 143: ...st program in memory Press C change to enter different start and stop times SCREEN G7 base will run every day from to Enter the time as hh mm in 24 hrs format If an invalid number for hours or minutes...

Page 144: ...S module is turned off while waiting for a program start If GPS is enabled the unit turns on GPS and waits for GPS lock and UTC synchronization This imposes a further delay on the time required for th...

Page 145: ...is those of the daily program but the dates is the last ones stored in memory Press C change to enter different schedules SCREEN G12 start stop p yymmdd hh mm yymmdd hh mm 01 020503 07 00 020504 23 00...

Page 146: ...e current time in hhmmss 020503 07 00 are start date and time of the program 020504 23 00 are stop date and time of the program When the start time is reached the survey begins NOTE The start time ind...

Page 147: ...es are saved as text space comma TAB or colon separated and not as worksheets or workbooks The magnetometer consoles can store up to 30 programs or schedules Therefore the files should have 30 or less...

Page 148: ...height above sea level values derived from GPS Satellites number of satellites visible for GPS or DGPS corrections for each reading This value can give a measure of survey positioning quality Picket x...

Page 149: ...ical information visit www gemsys ca Corrected Mag cor nT Satellite sat Time time Picket x picket x Picket y picket y Selecting Custom provides you with the option of changing the Default order to any...

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