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Applications

B1

-

2

ENVI-MAG Manual

.

Figure B-1

The magnetic field of the Earth.

The ENVI-MAG is a

total-field

magnetometer, and optionally a gradiometer, using

the

proton-precession

technique to measure the

scalar amplitude

of the magnetic

field vector. This is explained with the aid of the diagram shown in Figure B-2 on
page B1-3. The predominant magnetic field is that of the Earth’s (shown by the
vector in the figure). A local magnetic disturbance has its own magnetic field
(represented by the vector

in the figure). This local vector adds to the Earth’s

field vector to produce the total-field vector . What the ENVI-MAG in the total-
field mode measures, is the projected

amplitude

of the total-field T in the

direction of the dominant Earth’s field . This is displayed as the intensity in
nanoTeslas by the instrument.

Note:

No directional information concerning the field of the local magnetic
disturbances can be inferred from a total-field intensity measurement.

With the ENVI-MAG, you can measure not only the total-field intensity, but also
the vertical gradient (or

rate of change

) of the total field (if you have purchased

the gradiometer option). The vertical gradient, as previously mentioned, is the
rate of change of the total field with vertical distance. This measurement is
accomplished by simultaneously reading the total magnetic field at two
different elevations, and recording the difference. The usefulness of both these
parameters will be explained in the next Chapter.

F

M

T

F

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Summary of Contents for ENVI-MAG

Page 1: ...Part Number 788 711 November 1994 ...

Page 2: ...yright SCINTREX Limited 1994 All rights reserved No part of this publication may be reproduced stored in a retrieval system or transmitted in any form or by any means electronic mechanical photo copying recording or otherwise without prior consent from SCINTREX Limited ENVI MAG WALKMAG and ENVIMAP are trademarks of SCINTREX Limited November 1994 Manual designed and produced by GEO F X Printed and ...

Page 3: ...uded ix How to use this manual ix HELP Line xi The ENVI MAG Instrument Introduction Cold boot A1 2 Instrument overview A1 2 Preparing the ENVI MAG Unpacking A2 2 Repacking A2 3 Assembly A2 3 The Instrument Pre defined operating modes A3 1 Console description A3 3 Keypad description A3 4 Display screens A3 8 Operating displays A3 12 ...

Page 4: ...peated surveys lines A5 4 WALKMAG Total field Gradiometer Automatic mode A5 5 Manual mode Total field Gradiometer Semi automatic A5 8 Base station operation A5 11 Search mode A5 13 Survey data correction procedures A5 15 Remote operation A5 20 Data output Output formats A6 1 Basic mode A6 7 Advanced mode A6 8 Maintenance and Repair Battery charging A7 1 Periodic maintenance A7 4 Fuse replacement A...

Page 5: ... Magnetic surveying overview Introduction B1 1 Basic magnetic theory B1 1 Magnetic targets B1 11 Survey planning Introduction B2 1 Sampling intervals B2 1 Precision and Accuracy of surveys B2 3 Grid layout and orientation B2 7 Survey procedures and a sample survey Introduction B3 1 Survey do s and don ts B3 1 Post survey procedures B3 11 Field example B3 12 Bibliography B3 17 ...

Page 6: ... ENVIMAP software C1 1 Processing system steps C1 1 Conventions used in this section C1 2 Installation and getting started Before you begin C2 1 Installation procedure C2 2 If you have problems C2 13 ENVIMAP Reference Limitations C3 2 Menuing system C3 2 Menu Reference C3 10 ...

Page 7: ...n fast reading and high sensitivity are required It is quite versatile and can be optionally configured as a total field magnetometer a gradiometer or as a base station Features The main features of the ENVI MAG include interactive menus for easy operator use selectable sampling rates as fast as 2 times per second WALKMAG mode for rapid data acquisition true simultaneous gradiometer option with th...

Page 8: ...a base station sensor and the cabling allows a field ENVI MAG to be connected for automatic magnetic diurnal variation corrections 3 Low temperature operations An external battery pouch along with a thermostatically controlled display heater will permit field operations down to minus 40 C 4 Expanded memory Larger capacity memory chips are available to provide additional data storage up to 5 times ...

Page 9: ...three sections labelled A to C A The ENVI MAG Instrument B Applications for the ENVI MAG C The ENVIMAP Software Type styles The following typeface conventions will be used throughout the manual There may be additional conventions used in the specific sections These will be described in the introduction for the section Convention Use Bold 1 An action you are required to perform 2 A proper name Ital...

Page 10: ...ping or a single step procedure Indicates specific information that you should read Indicates a tip new idea or helpful hint Indicates a note of caution You should pay special attention to this section Indicates a warning You should read this section very carefully Indicates a typical question you may have and provides an answer Please read this Indicates a very important message ...

Page 11: ...pter of interest The thumb tabs are arranged in descending order within each section with Chapter 1 always starting at the top HELP Line In order to provide a high degree and quality of technical support a special HELP Line is available for ENVI MAG users If you need any help with the instrument applying the instrument to a particular problem or help with the ENVIMAP software please contact SCINTR...

Page 12: ...Preface x ENVI MAG Manual ...

Page 13: ...3 Connecting the sensor s to the cable A2 3 Total field sensor A2 4 Base station sensor A2 5 Gradiometer sensors A2 6 Lower sensor A2 6 Upper sensor A2 7 Installing the terminal protective cover A2 8 Assembling the sensor staff A2 8 Back pack installation A2 9 Battery installation exchange A2 10 Using the external battery pack A2 11 Using an external power supply A2 12 The ENVI MAG Instrument ...

Page 14: ...s A3 12 Basic mode data collection displays A3 17 Search mode configuration display A3 18 Search mode data collection displays A3 21 Advanced mode configuration displays A3 22 Main operating display A3 22 Instrument setup display A3 23 Magnetometer setup display A3 25 Advanced mode data displays A3 29 Numeric data display A3 29 Graphic data display A3 31 Recall displays A3 32 Recall setup display ...

Page 15: ...er A4 6 Line and Station setup A4 7 Entering the starting station A4 8 Entering the starting line A4 8 Basic Mode A4 9 Sample total field setup A4 9 Search Mode A4 11 Sample search mode setup A4 11 Advanced Mode A4 12 Instrument setup A4 12 Sample total field setup WALKMAG or WALKGRAD A4 14 Sample stop and go gradiometer setup A4 17 Sample base station setup A4 20 Information display A4 23 Note en...

Page 16: ... 6 WALKGRAD gradiometer survey A5 7 Manual mode Total field Gradiometer Semi automatic A5 8 Check your setup A5 9 Start survey A5 9 Automating your measurements A5 10 Base station operation A5 11 Check your setup A5 11 Start operation A5 12 Search mode A5 13 Basic A5 13 Advanced A5 13 Survey data correction procedures A5 15 Using base station data A5 15 Tie point TIE PT mode A5 16 Loop type collec...

Page 17: ... A6 10 All data A6 10 Specific data A6 11 Line by line A6 12 Erasing data from memory A6 13 Basic mode A6 13 Advanced mode A6 14 Maintenance and Repair A7 1 Battery charging A7 1 One battery A7 2 Two batteries A7 3 Periodic maintenance A7 4 Cleaning the sensors A7 4 Desiccant exchange A7 4 Fuse replacement A7 5 Instrument disassembly assembly A7 6 Cable repair A7 7 Trouble shooting A7 8 ...

Page 18: ...tion A8 1 ENVI MAG technical specifications A8 1 Instrument parts list A8 4 Warranty Repair A8 5 Warranty A8 5 Repair A8 5 When to ship the unit A8 5 Description of the problem A8 5 Shipping instructions A8 6 U S A A8 6 Canada A8 6 Outside Canada U S A A8 6 ...

Page 19: ... for use Description Describes the physical parts of the ENVI console keypad and display menus It also describes the function of each key and the various modes and parameters shown on all the display screens Setting up Gives step by step instructions on how to set up the instrument as either a Total Field Magnetometer a Gradiometer or a Magnetic Base Station Operations Guides you through typical i...

Page 20: ... data quality and spotting of anomalies Data can also be recalled from memory for visual inspec tion dumped to the serial port RS 232 of a computer or directly to a printer In addition to this the base station data can be recorded on a strip chart recorder You can also automatically correct your magnetic data for diurnal variations when another ENVI MAG is used as a base station or when you conduc...

Page 21: ...VI MAG is packaged how to connect the components to get an operational unit the various options you may have for powering the unit The following two photographs show all the components less packing materials of the standard ENVI MAG and the ENVI MAG Gradiometer Figure A 1 The complete ENVI MAG total field kit ...

Page 22: ...161 The ENVI MAG with its accessories is packaged in die cut layers slabs of foam This provides a proper place for every item when you repack your instrument for shipping or storage These foam layers are disassembled in the following order starting at the top Layer Description Contains 1 1inch 25mm slab Full slab at top 2 2 inch 50mm slab ENVI MAG Console Back Plate with harness 3 1inch 25mm slab ...

Page 23: ...NVI MAG system requires you to connect up the external components This section will describe the steps required to completely assemble your instrument Connecting the sensor s to the cable The sensors are located in layer 6 of the packing materials while the cables are located in layer 4 The following illustrations show the proper cable connections for each of the different sensor configurations Th...

Page 24: ... at the bottom of the sensor the end with the terminals the large square plug is at the 9 o clock position 2 Use either SCINTREX cable number 780 547 the shorter one for the back pack configuration or cable number 780 550 for the staff configuration 3 Remove the cable hold down plate by unscrewing the screws at the 2 o clock and 4 o clock positions 4 Connect the black spade lug on the bare wire of...

Page 25: ...46 3 Remove the cable hold down plate by unscrewing the screws at the 2 o clock and 4 o clock positions 4 Connect the black spade lug on the black wire of the cable to the terminal at the 11 o clock position 5 Connect the red spade lug on the white wire to the terminal at the 1 o clock position 6 Place the cable in the larger slot just above the 3 o clock position 7 Re attach the cable hold down p...

Page 26: ...nd 4 o clock positions 5 Connect the red wire of the cable to the terminal at the 1 o clock position 6 Connect the black wire of the cable to the terminal at the 11 o clock position 7 Connect the green wire of the cable to the terminal at the 5 o clock position Please ensure that the already attached bare wire of the smaller two conductor cable remains attached 8 Connect the white wire of the cabl...

Page 27: ... each other Warning Both sensors must have their directional marks aligned in the same manner i e the N on the top sensor must be in line with the N on the bottom sensor 14 Remove the cable hold down plate of the upper sensor by unscrewing the screws at the 2 o clock and 4 o clock positions 15 Connect the white wire of the two conductor cable coming from the lower sensor to the terminal at the 1 o...

Page 28: ...VI MAG in the back pack mode The sensor staff is shipped in four sections These sections are located in layer 4 of the packing materials You should note that one of the sections has a sealed bottom and you should start assembling the staff with this section Staff sections are assembled individually and connected to the sensors as follows 1 Insert the male end partially into the female end and rota...

Page 29: ...r the back plate it is cut from part of layer 5 3 Fit the four buckles at the back of the harness through the slots in the cushion and the back plate to secure both to the harness 4 Attach the total field sensor to the connector at the top of the back plate About a quarter turn clockwise will secure the sensor to the back plate Caution You need to consider your travel direction while surveying whe...

Page 30: ...attery into the recess in the rear panel of the instrument 4 Connect it carefully to the MAIN BATTERY connector It is not important which side of the plug is up as long as the connector pins are properly aligned 5 Replace the cover and tighten both knurled screws 6 If this is the first time installation proceed with battery charging The small size and low cost of the battery makes it convenient to...

Page 31: ...Unscrew both knurled screws on either side of the battery cover 3 Lift off the cover and store it somewhere convenient for future use with the standard battery configuration 4 Remove the standard battery 5 Connect the connector in the dummy battery cover carefully to the MAIN BATTERY connector It is not important which side of the plug is up as long as the connector pins are properly aligned 6 Pla...

Page 32: ... that all cabling and sensors are as far away as possible from the generator as possible 2 12 volt battery car or marine A 12 volt car battery may be more appropriate for other applications The special External Power Cable SCINTREX P N 788 029 should be used for this purpose 1 The standard internal battery may be left in place 2 Plug in the end of the cable with the single plug into the Charger Co...

Page 33: ...sed for site characterization drum location and archaeology operates in the WALKMAG mode continuous reading does not have on line data recall features you have to dump the data to a computer to inspect it you can still see a graphical display of the data data correction is from a base station or the TIE PT Loop mode only Search mode operates in a continuous reading mode but the data is not stored ...

Page 34: ...Instrument A3 2 ENVI MAG Manual Figure A 9 The ENVI MAG console 2 1 3 4 7 8 9 5 10 6 3 11 ...

Page 35: ... data B RS 232 receive data D analog out O 1 Volt 6 Charger External Power Connector This connector accepts the charger to recharge either the standard battery or the external heavy duty battery pack It also accepts external well filtered 11 to 16 Volt DC input The center pin is negative The shell is positive 7 Charging Light The charging light is visible through a window at the left side of the c...

Page 36: ...he right and left sides of the console for easy access Some keys have up to three separate functions assigned to them The response of these multi function keys depends upon the operation in progress Note The function mode of the keys has precedence over the alpha numeric mode of the keys Figure A 10 The ENVI MAG keypad ...

Page 37: ...ed 1 Accesses the Auxiliary Functions display allowing setting of the LCD intensity data output locking of the setup parameters reprogramming of the main system software EEPROM 23 Moves the cursor to the left or up to the right or down e 2 identical keys opens and closes the parameter fields during setups opens and closes the scaling option field for the graphics display toggles the sample rate in...

Page 38: ...al and graphic data presentation during data acquisition only 9 Presents the Recall display for selection of data item to be recalled setting of the starting location or time of the recall r Manually records measured data and notes in internal memory 8 Acts as the START key at a Tie point This is used for the Tie point line and loop mode corrections Facilitates the scrolling forward or backward th...

Page 39: ...ed operating modes options 5 to 7 from the initial configuration menu q 1 Pressing the ON and AUX LCD keys simultaneously performs the COLD BOOT operation resetting the instrument to factory defaults q 5 Pressing the ON and SETUP keys simultaneously allows you to select between Basic Search or Advanced modes Key Description ...

Page 40: ...ds of information as shown below WELCOME TO ENVI APPLICATIONS MENU 1 Site Characterization 2 Drum Location 3 Archaeology 4 Search Magnetometer more Please Select Your Application Figure A 11 General display information bands 1 The Title Line at the top indicates the current operating functions 2 The middle six lines contain specific display information consisting of either instrument and survey pa...

Page 41: ...w which key to press to make any changes Display blocks Some displays are divided into two or more blocks or sub panels The blocks are separated by solid partition lines as shown in the following figure Figure A 12 Instrument display showing information blocks sub panels To move the cursor from one block to another press the NEXT key Some measured data is displayed on more than one page display sc...

Page 42: ... of impending operations requiring a Y yes or N no entry from the keypad status indication of an operation under way such as data output Figure A 13 Sample pop up windows MODE t fldDUR 0 5s TUNE FIELD 60000 AUTO TUNE yes TM DT OUTPUT OUTPUTING DATA BASE TIE ERASE MEMORY Chg ENT 000 help INFO BATT 134 locations TIME 13 40 35 DATE 94 10 02 ST 0 SEP 0 Main Menu ESC LN 0 SEP 0 Chg ENT 000 help INFO BA...

Page 43: ...in a cyclical manner as shown in the above figure To return to the main operating menu press the ESC key Cold Boot AUX ON simult Follow setup inst bottom left line To change application SETUP ON simult Switch Window NEXT Read START STOP Tie point read TIE While reading NEXT to tag station Main Menu ESC 000 V2 1 more Read end GRAPH NUM NEXT to view data On graph ENTER recall Scale 0 centr On num NE...

Page 44: ...e configuration options after pressing the SETUP ON keys simultaneously 1 Site Characterization 2 Drum Location 3 Archaeology The following is the general layout of the Main operating display in the basic mode Figure A 15 General display layout MODE t fldDUR 0 5s TUNE FIELD 60000 AUTO TUNE yes ST 0 TM DT OUTPUT SEP 0 BASE TIE ERASE MEMORY LN 0 SEP 0 Chg 000 help INFO BATT 134 locations Title Line ...

Page 45: ...arth s ambient magnetic field in the survey area For best performance the tuning field should match the ambient field as closely as possible at least to within 1000 nT A map showing the approximate field intensity on the Earth s surface can be found in Section B Applications Figure B1 4 on page B 4 The values shown can be used as a starting point and applied equally to the Total field sensor or th...

Page 46: ... displayed showing the current values of TIME and DATE in your instrument Use the arrow keys to move the blinking cursor to the field you wish to change Press ENTER again and enter the value from the keypad Finish the entry by pressing ENTER one more time To get back to the main menu press the ESC key NOTE If you will be using a base station to correct the data you must ensure that the date and ti...

Page 47: ...ation will be displayed in a pop up window before your data is corrected You must press the 9 YZ key to begin or the 5 MNO key to abort NOTE The original raw data is changed ERASE MEMORY Allows clearing of the data memory You must press the ENTER key A request for confirmation will be displayed in a pop up window before the actual erasure takes place You must press the 9 YZ Yes key to begin or the...

Page 48: ... allows the entry of the geographical direction or the Cartesian co ordinates and is one of N E S W or Chg _ ENTER Depending upon which field the cursor is located in you will see one of these prompts Chg allows you toggle a selection from an internal list by pressing either the or keys ENTER Pressing ENTER will either pop up a window for further operation or let you enter a numeric value terminat...

Page 49: ...s collected along the line LN The display appears as follows MAG TOTAL mmmmm m LN llll ld ST ssss sd Figure A 17 Graphical display of a survey line 2 You can press the NEXT key to pop up the graphical display of the precession decay signal of the last reading Very sharp rapid decays indicate possible poor signal conditions The display appears as follows 00 MAG 13 45 30 TOTAL NOISE GRADIENT LN 50 E...

Page 50: ... from the configura tion menu available after pressing the SETUP ON keys simultaneously 4 Search Magnetometer The Main operating display in the Search mode is as follows Figure A 19 Search mode main display screen 00 MAG 13 45 30 TOTAL LN 50E 59875 2 ST 98N 59623 7 97N 59590 3 96N 59581 4 95N MEMF 88 BATT 134 MODE srch DUR 0 5s TUNE FIELD 60000 AUTO TUNE yes TM DT Chg 000 help INFO BATT 134 ...

Page 51: ...plied equally to the Total field sensor or the Gradiometer sensor AUTO TUNE A yes no toggle that controls the automatic tuning function It is independent for the Total field sensor and the Gradiometer sensor The tuning value is updated after each reading in preparation for the next one Auto tuning is particularly applicable if large variations of the ambient field are encountered over longer dista...

Page 52: ...n which field the cursor is located in you will see one of these prompts Chg allows you toggle a selection from an internal list by pressing either the or keys ENTER Pressing ENTER will either pop up a window for further operation or let you enter a numeric value terminated by another press of the ENTER key help INFO This prompt indicates that the help screens are available when you press the INFO...

Page 53: ...ss the NEXT key to pop up the graphical display of the precession decay signal of the last reading Very sharp rapid decays indicate possible poor signal conditions Please see Figure A 18 on page A3 18 for an example of the signal quality display Note The values that you see for the line and station in the numeric display are the last ones entered in a previous mode The search mode does not use the...

Page 54: ...ced mode The configurable parameters of the Main operating display are Parameter Description MAG mmm shows which type of magnetometer measurement is currently enabled and therefore ready to be started ST The station number for this measurement It consists of the numeric part ssss s and the directional part d The range is from 0 to 99999 with a decimal point as required The direction allows you to ...

Page 55: ...ive or negative It may not necessarily represent the reading separation See the NEXT key and AUTO St INC for more information When the separation is positive the station number gets incremented by the separation When the separation is negative the station number gets decremented by the separation Note a negative W S station when incremented becomes less negative and vice versa LN The line number a...

Page 56: ...applicable for Base Station operation which is set in the Mag Setup no CYCLE DELAY The delay between readings when the cycle repeat feature is enabled It affects the total field magnetometer or gradiometer only The base station repetition rate is controlled in the Mag Setup under Cycle Time The cycle delay is the time between the end of one reading to the beginning of the next reading This delay i...

Page 57: ...RECT yn TIE MODE lll REMOTE yn AUTO RECORD yn Chg BAT bbb Figure A 24 Magnetometer setup display Parameter Description Default MODE Allows the selection of Total Field Magnetometer default Gradiometer Base Station Off will disable the ENVI MAG tfld DURATION The measurement duration A choice of 0 5 1 or 2 seconds is available The correct selection depends on the desired measurement accuracy and the...

Page 58: ... that applies a BASE STATION correction using data supplied from a base station ENVI MAG You must press the key to toggle the yes on You need to have the base station connected as described in Using base station data on page A5 15 A request for confirmation will be dis played in a pop up window before your data is corrected You must press the 9 YZ Yes key to begin or the 5 MNO No key to abort NOTE...

Page 59: ...CYCLE TIME The reading interval of the base station The allowable range is 0 to 9999 seconds Entering 0 zero results in a reading interval equal to the reading time The instrument goes to sleep between readings for 4 seconds and up 0 CHART SCALE The sensitivity for the analog output for the strip chart recorder The following choices are available 1 10 100 1000 10000 nT 1 Parameter Description Defa...

Page 60: ...parameter depends upon your particular survey conditions it is not possible to suggest the best setting The mode should therefore be established by experimenting In general it is more ap plicable to use fixed tuning for the site characterization and drum location modes No BASEFIELD The base field is used in conjunction with the base station correction procedure The base station correction techniqu...

Page 61: ...s substantially less precise than the base station correction method Line AUTO RECORD A yes no toggle This function is used in the semi auto matic mode to save you from having to press another key Auto Record is always in effect in the base station operation or if the Cycle Repeat function is selected in the ENVI MAG Instrument Setup no Parameter Description Default ...

Page 62: ...age 2 shows the signal precession as a bar graph This allows you to monitor the quality of each reading The total field and the base station displays differ in that the gradient column is absent The following table shows the availability of a numeric displays after pressing the NEXT key You will have to use the RECALL function if you have pushed the ESCAPE key MAG hh mm ss TOTAL NOISE GRADIENT LN ...

Page 63: ...based on the noisiness of the individual periods of the precession signal The smaller the value the better the quality of the reading GRADIENT The magnetic gradient between the two sensors Expressed in nT m TIME The current time in hours minutes seconds It is used to time stamp each reading LN The line number on which this measurement took place The value consists of the numeric and directional pa...

Page 64: ...nction if you have pushed the ESCAPE key Depends upon the status before STOP was pressed MAG GRADIENT ggg g LN llll ld ST ssss sd Figure A 27 Graphic data display of page 2 t After STOP key before ESCAPE key While reading Base station Page 1 yes no yes Page 2 yes no yes Display Item Description GRADIENT The display title indicating the data shown by the graph The numeric value indicated by ggg g i...

Page 65: ...setup display ST The station number at the cursor position to which the respective magnetic data applies consisting of the nu meric and directional parts Display Item Description MAG The mode of the data collected Either one of Total Field Gradient or Base Station LN The line number whose data is to be recalled consisting of the numeric and directional parts ST The station number is the starting l...

Page 66: ...tical scale and bring any point to the vertical center of the window Exact values can be read off the numerical section at the left hand side of the display The Total Field display is shown and explained The Gradient display differs in title only The Base Station display shows Time and Date instead of Line and Station Note that there are two pages of data for the gradiometer These displays are acc...

Page 67: ...0 Figure A 30 The Recall display ready for customizing Display Item Description TOTAL The title of the display indicating the data shown by the graph The numeric value indicated by mmmmm m is the respective total field value at the indicated line and station number LN The line number along which this measurement took place consisting of the numeric and directional parts ST The station number to wh...

Page 68: ...tion SCL Shown after the ENTER key is pressed It indicates the vertical full scale Scrolling using the keys allows the full scale values of 1 10 100 1000 10000 nT This is the cursor which is normally at the left edge of the window It can be moved with the aid of the cursor keys Numerical data at the left hand side of the display represents the data at the cursor position 0 ...

Page 69: ...ary functions 0 These keys allow you to adjust the intensity of the LCD screen for better viewing under a variety of lighting conditions 1 This option allows you to access the Data Output menu to transfer information to your computer or printer 2 This function is reserved for production and service tests It has no functions for you to use 3 The lock option allows you to lock the ENVI MAG setup par...

Page 70: ... LN yn all data recorded LN llll l d MAG t fld grad base BAUD bbbbb DL tttBIT b FMT xxxxx Output START BATT bbb Figure A 32 The data output display Parameter Description Default all data recorded With the cursor placed after the colon all the data in the instrument would be dumped sequentially into one possibly very large file MAG Lists the modes available for the ENVI MAG As shown only the gradio...

Page 71: ...erals such as some printers The range is 0 to 999 ms This value is normally left at 0 for dump to computers The proper setting has to be established experimentally for other equipment Problems usually are indicated by the loss of a few characters 0 BIT The number of data bits The default value is 8 bits which usually works properly The proper setting has to be established experimentally For exampl...

Page 72: ...rtesian coordinates N and E are positive while S and W are negative Z is one or more items of magnetic data There is one set of data per printed line including the time of the measurement CAUTION Due to the lack of header informa tion you should label the files clearly XYZ XYZ is identical to XYZ but a header and user entered NOTES are added XYZ XYZ is identical to XYZ but the data is now placed i...

Page 73: ...key NOTES nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn MACROS 1 ccccccccccccccc 2 ccccccccccccccc 3 ccccccccccccccc 4 ccccccccccccccc 5 ccccccccccccccc Chg ENT BATT bbb Figure A 33 The NOTES display Parameter Description NOTES Alpha numeric characters including and up to 32 characters A note can be saved as one of five macros in a separate memory for re use MACROS 1 5 MACROS are pre recorded messages of up to...

Page 74: ...ay Parameter Description Vx x The version number of the ENVI MAG internal software TIME The current time of day DATE The present date SER This is usually the serial number of the instrument No use is made of this number by the instrument there fore it also could represent the users inventory number Up to 8 digits are accepted JOB This may be the survey project number Up to 6 digits are accepted OP...

Page 75: ...perating displays ENVI MAG Manual A3 43 Instrument Warning The TIME and DATE must match between the base station and the portable magnetometer s for the base station style of correction to work properly ...

Page 76: ...Instrument A3 44 ENVI MAG Manual ...

Page 77: ... gradiometer survey in the stop and go mode advanced base station operation advanced First time operation A special procedure has to be followed to get the ENVI MAG software set up properly This procedure is called a cold boot This assures that all setup parameters are initialized properly and that the memory is cleared Important First time operation procedures cold boot have to be carried out eve...

Page 78: ... the ENVI MAG is truly in the OFF state 2 Press and hold the AUX LCD key Then press the ON key Release both keys after the beep The following message should appear COLD BOOT Y N WARNING Setup parameters data will be erased 3 Press the 9 YZ key containing Y for yes to confirm the cold boot operation 4 You are now ready to set up your ENVI MAG for surveying Note The default configuration is the adva...

Page 79: ... either the or keys 3 Select the appropriate configuration for the type of survey you wish to perform by pressing the corresponding numeric key i e 1 to 7 This configuration can be changed at anytime by repeating step 1 5q WELCOME TO ENVI APPLICATIONS MENU 1 Site Characterization 2 Drum Location 3 Archaeology 4 Search Magnetometer more Please Select Your Application WELCOME TO ENVI APPLICATIONS ME...

Page 80: ...ave one of the following three Main operating displays Figure A 36 Main operating displays for all modes MODE t fldDUR 0 5s TUNE FIELD 60000 AUTO TUNE yes ST 0 TM DT OUTPUT SEP 0 BASE TIE ERASE MEMORY LN 0 SEP 0 Chg 000 help INFO BATT 134 locations MODE srch DUR 0 5s TUNE FIELD 60000 AUTO TUNE yes TM DT Chg 000 help INFO BATT 134 00000 START 00000 of MAG mmmm ST sss s d SEP pppp p LN llll l d SEP ...

Page 81: ...meter field move the cursor by repeatedly pressing either of the cursor keys until the cursor is on the desired field Change parameters There are two types of parameters those that are selected from a list and those that you must fill in a value The proper method for changing a particular item is indicated by the prompt at the left hand bottom corner of the display Changing the parameters requires...

Page 82: ...er field requires you to enter a specific value To enter values you will be required to do the following Step PRESS Action 1 e This opens the field for data entry as indicated by a new prompt at the start of the field 2 1 to 9 Key in the desired value If the field requires a numeric input just press the appropriate keys in sequence If the field requires alphanumeric input you may need to press the...

Page 83: ... Please also refer to Laying out the grid on page B3 1 for more details on survey grids To show you the steps required to set the line station values the following example will set the Line Number LN to Line 16 East sometimes marked as 16 00E with a Line separation SEP of 2 set the Station Number ST to 50 North sometimes marked as 50 00N with a Station separation SEP of minus 10 The minus indicate...

Page 84: ...e starting line 8 Move the cursor to LN 9 Enter 16 10 Move the cursor one step forward 11 Enter e for east 12 Move the cursor to SEP 13 Enter 2 This indicates that you will be surveying successive lines 2 units apart and you will be moving in a easterly direction To set your required starting point and separations just substitute your specific values in the previous steps Also keep in mind that en...

Page 85: ...bient field base station or tie point Loop mode data correction only fixed output at 9600 baud with a XYZ format Sample total field setup 1 Move the cursor to MODE 2 Select tfld from the list of tfld grad base 3 Move the cursor to DUR 4 Select 0 5 sec from the following list 0 5 sec 1 sec 2 sec 5 Move the cursor to TUNE FIELD MODE t fldDUR 0 5s TUNE FIELD 60000 AUTO TUNE yes ST 0 TM DT OUTPUT SEP ...

Page 86: ...isplay 11 Enter the time and date using the steps 2 to 13 on page A4 23 Warning If you are using a base station please make sure that the time and date are the same as your field unit If the time is out the corrections will be incorrectly applied If the date is wrong no corrections can be performed at all 12 Enter your survey grid values as described in Line and Station setup on page A4 7 You are ...

Page 87: ... where no permanent record of the data is required There are only two parameters that need to be set for this mode the duration of the reading and the tuning ambient field value Sample search mode setup 1 Move the cursor to DUR 2 Select 0 5 sec from the following list 0 5 sec 1 sec 2 sec 3 Move the cursor to TUNE FIELD 4 Enter 60000 or whatever value is appropriate for your survey area please refe...

Page 88: ... how often a reading is taken a total field WALKMAG and or WALKGRAD survey a gradiometer Stop and Go survey a base station operation note entry other auxiliary functions Instrument setup The following setup prepares the instrument for a total field or gradient survey in the WALKMAG or WALKGRAD modes respectively This mode uses the cycle re peat feature of the measurement A cycle delay can also be ...

Page 89: ... Select yes You want the instrument to continuously take readings at the rate specified by the DURATION parameter 8 Move the cursor to CYCLE DELAY 9 Enter 250 This value is in milliseconds and pauses the reading cycling by 250 ms This is useful when you are traversing uneven ground where your speed may vary 10 Ignore ERASE MEMORY 11 Move the cursor to HEATER 12 Select no unless you are doing a win...

Page 90: ...display appears MAG SETUP menu AUTO ST INC yn LINK REC START yn CYCLE REPEAT yn CYCLE DELAY yn ERASE MEMORY yn HEATER yn Chg ENT BATT bbb 2 Carry out steps 2 through 9 as shown on page A4 13 for setting up the instrument if you have not already done so 3 Move the cursor to MAG SETUP 4 Press ENTER and the MAG SETUP display appears MODE mmm CYCLE TIME ttt DURATION ddd CHART SCALE sss TUNE FIELD ffff...

Page 91: ... sec 1 sec 2 sec 9 Move the cursor to TUNE FIELD 10 Enter the ambient magnetic field value of your survey area Please refer to Figure B 4 on page B1 4 if this value is unknown 11 Ignore BASE CORRECT 12 Ignore TIE CORRECT 13 Move the cursor to REMOTE 14 Select no 15 Move the cursor to CYCLE TIME 16 Enter 0 this parameter is used in the base station mode only and should be 0 for all other modes 3 3 ...

Page 92: ...you encounter strong cultural electrical noise or large variations in the ambient field with very strong gradients you may want to turn the automatic tuning off 21 Move the cursor to BASE FIELD 22 Enter the ambient magnetic field value if known of your survey area You can also take a reading and enter the first value with good signal 23 Ignore TIE MODE 24 Move the cursor to AUTO RECORD 25 Select n...

Page 93: ...y proceed as follows 1 Press the SETUP key and the INSTRUMENT SETUP display appears MAG SETUP menu AUTO ST INC yn LINK REC START yn CYCLE REPEAT yn CYCLE DELAY yn ERASE MEMORY yn HEATER yn Chg ENT BATT bbb 2 Follow the instructions for the Instrument setup as shown on page A4 12 but substitute the following 3 Move the cursor to CYCLE REPEAT 4 Select NO 5 Move the cursor to CYCLE DELAY 6 Enter 0 7 ...

Page 94: ... to MODE 10 Select grad from the following list off t fld grad base 11 Move the cursor to DURATION 12 Select 2 sec from the following list 0 5 sec 1 sec 2 sec 13 Move the cursor to TUNE FIELD 14 Enter the ambient magnetic field value of the survey area Please refer to Figure B 4 on page B1 4 if this value is unknown 15 Ignore BASE CORRECT 16 Ignore TIE CORRECT 17 Move the cursor to REMOTE 18 Selec...

Page 95: ...owing list 1 10 100 1000 10000 23 Move the cursor to AUTO TUNE 24 Select no 25 Move the cursor to BASE FIELD 26 Enter the ambient magnetic field value of the survey area if known 27 Ignore TIE MODE 28 Move the cursor to AUTO RECORD 29 Select no 30 Press ESCAPE to return to the Main operating display 0 3 3 3 3 3 0 ...

Page 96: ...TUP key and the INSTRUMENT SETUP display appears MAG SETUP menu AUTO ST INC yn LINK REC START yn CYCLE REPEAT yn CYCLE DELAY yn ERASE MEMORY yn HEATER yn Chg ENT BATT bbb 2 Follow the instructions for the Instrument setup as shown on page A4 12 but substitute the following 3 Move the cursor to CYCLE REPEAT 4 Select no 5 Move the cursor to CYCLE DELAY 6 Enter 0 7 Move the cursor to MAG SETUP 8 Pres...

Page 97: ...base from the following list off t fld grad base 11 Move the cursor to DURATION 12 Select 2 sec from the following list 0 5 sec 1 sec 2 sec 13 Move the cursor to TUNE FIELD 14 Enter the ambient magnetic field value of the survey area Please refer to Figure B 4 on page B1 4 if this value is unknown 15 Ignore BASE CORRECT 16 Ignore TIE CORRECT 17 Move the cursor to REMOTE 18 Select no 19 Move the cu...

Page 98: ...ed chart recorder sensitivity 23 Move the cursor to AUTO TUNE 24 Select no 25 Move the cursor to BASE FIELD 26 Enter for now your ambient magnetic field value if known 27 Ignore TIE MODE 28 Move the cursor to AUTO RECORD 29 Select no 30 Press ESCAPE to return to the Main operating display 3 3 3 3 0 ...

Page 99: ...ss the INFO key and the Information display appears TIME hh mm ss SER sssssssss DATE yy mm dd JOB jjjjjjj OPERATOR oooooooooo MEMF ppp Chg ENT BATT bbb 2 Move the cursor to TIME 3 Enter the current hour 4 Move the cursor one step 5 Enter the current minute 6 Move the cursor one step 7 Enter the current seconds or set to zero 8 Move the cursor to DATE 9 Enter the current year 7 scintrex data acquis...

Page 100: ...rent day numeric entry 1 to 31 14 Move the cursor to SER 15 Enter the instrument serial number or other permanent identification 16 Move the cursor to JOB 17 Enter a job number or other unique identifier for the survey 18 Move the cursor to OPERATOR 19 See Note entry on page A4 25 for detailed instructions on how to enter alphanumerics 3 3 3 3 3 ...

Page 101: ... also three letters which can be accessed by subsequent keystrokes such as 1 A B C 1 The CLEAR key allows deletion of erroneous entries whereas the NEXT key allows spaces between words New macros can be entered by simply over writing the previous ones The following steps enter the macro fence 1 as Note 1 Other macros would be entered similarly except that they would be saved with Note 2 Note 3 etc...

Page 102: ... way until fence is completed 7 Press the NEXT key twice 8 Press the 1 key 9 Press ENTER 10 Press the NOTE key followed by the 1 key You should now see fence 1 appear further down under MACRO 1 Unique notes belonging to one reading only are entered in the same way with the exception that step 10 is omitted The note will then be recorded along with the data The note entry field is then cleared t 2 ...

Page 103: ...ed as follows From the Main operating display 1 Press the AUX LCD key and the Auxiliary Function display appears ESC LCD Intensity 1 Data Output 2 Factory Test 3 Lock OFF 4 Reprogram System Select function 2 Press the or key to adjust the intensity of the display to your satisfaction 3 Press ESCAPE twice to return to the Main operating display 1 auxiliary functions 00 ...

Page 104: ...play 1 Press the AUX LCD key to bring up the Auxiliary display ESC LCD Intensity 1 Data Output 2 Factory Test 3 Lock OFF 4 Reprogram System Select function 2 Press the 3 key to toggle the locking feature ON 3 Do your work 4 To unlock the instrument repeat steps 1 and 2 except that now the locking is toggled to OFF 5 Press ESCAPE to return to the Main operating display 1 auxiliary functions 3 0 ...

Page 105: ...Start the program FLASHCOM i e enter flashcomL 4 Depending upon the type of display your PC has enter one of k for monochrome display c for CGA displays v for VGA displays 5 You will then be asked to enter the name of the download program from step 1 i e DASPROM SYS or what ever was on the disk 6 The PC will display WAITING At this point it is waiting for the ENVI MAG console to come on line At th...

Page 106: ...t this point the PC will start to display the activity of the download procedure showing the percentage that is complete 7 When the download is finished i e 100 complete on the PC wait for about 10 to 15 seconds for the ENVI MAG to reprogram The ENVI MAG will then automatically perform a cold boot and you are ready to survey auxiliary functions 4 WARNING You are about to REPROGRAM your current ver...

Page 107: ...power shut down at either the PC or ENVI end you will have to repeat the above steps If the ENVI MAG does not reboot for some reason you must power the unit off and then on The screen may not be functional but the bootstrap program is running Start the download from the PC again ...

Page 108: ...Setup A4 32 ENVI MAG Manual ...

Page 109: ...G a sample WALKMAG automatic mode of survey basic mode a sample Stop and Go semi automatic mode of survey advanced base station operation advanced search mode surveys data correction procedures using the base station tie line or loop survey modes operating the ENVI MAG under the control of another host computer Remote operation Accurate and meaningful measurements The quality of your measurements ...

Page 110: ...for surveying while walking up or down a survey line Effects of gradient Many small items carried by the operator in addition to the magnetometer may be magnetic and therefore upset locally the magnetic field to be measured Such items are notebooks pencils cigarette lighters eye glasses dentures etc just to mention a few The higher the magnetic gradient is at the sensor the poorer the proton prece...

Page 111: ...ng is a back pack mounting and is referred to as the WALKMAG mode The sensor has to be oriented once for a given area to suit the line direction Since the sensor response is symmetric you do not have to worry about reversing the orientation as you go up and down the survey lines Base station The Base station is normally installed as close to the actual survey area as practical to minimize spatial ...

Page 112: ...nner The ENVI MAG recalls or outputs repeated data sequentially by time at the same locations resulting in unsightly or unintelligible recall displays You will also have to substantially edit your data files to properly use them with the ENVIMAP software It is recommended that you assign a minor increment to the survey line number prior to re surveying to avoid problems For example if you are abou...

Page 113: ...This should give you a better understanding of what you will be required to do when doing your ENVI MAG survey It is assumed that the lines are marked and pegged intervals of 10 units The most suitable configuration for such a survey is with the sensor mounted and properly oriented onto the back plate Ensure that the sensor orientation is such that when you are walking along the survey line the N ...

Page 114: ...sses the first station peg If you trigger the station marker at the time that you yourself pass the station rather than the sensor you will likely introduce a herring bone pattern into the survey data Observe how the Station Number decrements 7 Repeat the previous step at each peg 8 At Station 50 W Press STOP right after you have pressed NEXT 9 You can now inspect your data graphically before you ...

Page 115: ... Press START and proceed walking to the West again etc The beep indicates the start of the first reading which belongs to Station 50 E WALK GENTLY WITHOUT SWINGING YOUR SHOULDERS UNNECESSARILY TO PREVENT EXCESSIVE ROTATION OF THE SENSOR OR AGITATION OF THE SENSOR FLUID OTHERWISE THIS WILL LEAD TO NOISY DATA WALKGRAD gradiometer survey A walking type of gradiometer survey is done in the same manner...

Page 116: ...ual procedure is explained first followed by some suggestions on how to make it semi automatic It is assumed that the lines are marked and pegged at 10 units of interval the sensor is carried on the staff This results in highest precision as this eliminates the possibility of a small magnetic signature caused by the ENVI MAG console The sensor has to be oriented for each reading Figure A 39 A typi...

Page 117: ...ld the sensor steady and Press the START key to take a reading 7 Inspect the data 8 Re adjust the TUNE FIELD in the mag setup if necessary to the current total field value Re check the tuning periodically in case that the ambient field is changing considerably during the survey day 9 Press the RECORD key to save the data 10 Press ESCAPE optionally followed by OFF 11 Proceed to the next station to ...

Page 118: ... to LN 28 Press the key to increment the line number to 20 N 29 Proceed with Line 20 N Automating your measurements There are two items which can be automated after each measurement data recording altering of the Station Number can take place automatically Caution Please note that repeat measurements will alter the Station Number and possibly disrupt the correlation between location and data To en...

Page 119: ...t up and connected proceed as described in steps 1 3 to set up the instrument or at least to verify proper settings as shown in the Sample base station setup on page A4 20 You may have to cold boot your ENVI MAG and select one of the advanced configurations 5 to 7 Check your setup 1 Set up Line and Station Number to the actual location of the base station This is recommended to avoid later confusi...

Page 120: ...ing the ENTER key 10 Enter the measured total field value as TUNE FIELD and also as the BASE FIELD 11 Enter the Base Field into all mobile units 12 Press the ESCAPE key and resume the measurement 13 Press the NUM GRAPH key to show the graph 14 Press the or key to change the sensitivity of the graph The new full scale value is shown briefly on the message line at the bottom of the display You can a...

Page 121: ...u then can follow the setup as described under Search Mode onpage A4 11 Youonly need toenter twovalues before you start the duration of the reading typically 0 5 sec the tuning field value Advanced This procedure gives you the same results as using the basic mode described above Pressthe SETUP and ON keys simultaneously togettheconfiguration menu Select one of the advanced configurations 5 7 This ...

Page 122: ...asking for the cable length you are using 8 Press either the 2 key for the LONG standard 50m base station cable or the 3 key for the SHORT total field sensor and cable 9 Press the NUM GRAPH key to display the graph 10 Press the or key to change the sensitivity of the graph You can also press the 0 zero key to center the graph vertically ...

Page 123: ... base station data when you have selected one of the advanced 5 7 survey configurations This procedure describes the correction when using ENVI MAG only The correction with different instruments must be done indepen dently on a computer Caution The base station correction physically modifies the data of the mobile units but does not alter the base station s data Please make certain that the Base F...

Page 124: ...he data in the se quence expected for the two types of correction Line and Loop are explained in Section B Applications Tie point Line and Loop mode corrections on page B3 5 It should be noted however that this correction method is not as accurate or precise as the Base station Correction method A technical paper on this subject Magnetic Correction Techniques is available from SCINTREX Note Both L...

Page 125: ...pe collecting data This mode is only available when using the advanced configurations 5 7 See Configuration menu on page A4 3 During a traversal along the tie line you have chosen the Station numbers are kept constant but the Line numbers are changed It is assumed that the instrument has been fully set up in advance for other functions A few setup items have to be changed 1 Call up the instrument ...

Page 126: ...Line number 16 Repeat steps 12 15 to complete collecting the tie line data 17 Proceed with your normal survey as illustrated in the following diagram Figure A 42 Tie line method for collecting correction data Note If you need more than one day to complete your survey in the Line type mode please make sure that you collect all your Tie points as the first data that you store in memory i e before yo...

Page 127: ...indicating that the data will be altered 4 Press the key containing Y for yes or N to abort 5 When finished Press the E SCAPE key Advanced modes 1 Call up the mag setup display 2 Move the cursor to TIE CORRECT 3 Select YES 4 You will now see a warning message on the right side of the display indicating that the data will be altered 5 Press the START key 6 You will now be asked to confirm the corre...

Page 128: ...n page A6 8 7 Send a S hex 53 dec 83 to initiate one reading The spacing between subsequent S must be greater than the chosen duration 8 A CR character hex 0D dec 13 should be sent at least every 50 seconds if the reading interval is longer than 1 minute to prevent the automatic power down sequence 9 Receive the data after the end of each reading in the following sequence Time in decimal form Tota...

Page 129: ...SCINTREX if you are interested in a specialized high speed downloading program The RS 232 cable SCINTREX P N 745 081 is the link between the ENVI MAG data output connector and the serial port of the computer or printer Note The null modem SCINTREX P N 210 154 as used for the base station correction must not be used here Output formats In the advanced mode configurations 5 to 7 the data can be dump...

Page 130: ...ction nor does it contain NOTES A short sample of the format follows 10 0 56491 22 0 26 7 298611 0 2 59 9 28571 0 56491 63 0 28 7 298750 0 1 54 8 57143 0 56488 17 0 27 7 298889 0 1 94 7 85714 0 56488 55 0 26 7 299028 0 2 77 7 14286 0 56486 25 0 28 7 299167 0 2 78 6 42857 0 56484 66 0 27 7 299306 0 4 17 5 71428 0 56481 91 0 24 7 299444 0 5 49 5 0 56478 62 0 26 7 299722 0 6 36 ...

Page 131: ... r Serial__ 3 Basefld_ 56490 0 Duration 0 5 Mag_Data X Y TotFld Noise Hours 0 Uncor Grad 10 0 56491 22 0 26 7 298611 0 2 59 9 28571 0 56491 63 0 28 7 298750 0 1 54 8 57143 0 56488 17 0 27 7 298889 0 1 94 7 85714 0 56488 55 0 26 7 299028 0 2 77 7 14286 0 56486 25 0 28 7 299167 0 2 78 N pipe 6 42857 0 56484 66 0 27 7 299306 0 4 17 5 71428 0 56481 91 0 24 7 299444 0 5 49 5 0 56478 62 0 26 7 299722 0 ...

Page 132: ...pecially configured to read this format S C I N T R E X Line____ 0 00000 N Date____ 93 05 21 Job_____ 1 Operator r Serial__ 3 Basefld_ 56490 0 Duration 0 5 Mag_Data X Y TotFld Noise Hours 0 Uncor Grad 10 0 56491 22 0 26 7 298611 0 2 59 9 28571 0 56491 63 0 28 7 298750 0 1 54 8 57143 0 56488 17 0 27 7 298889 0 1 94 7 85714 0 56488 55 0 26 7 299028 0 2 77 7 14286 0 56486 25 0 28 7 299167 0 2 78 N pi...

Page 133: ...perator r Serial__ 3 Basefld_ 56490 0 Duration 0 5 Mag_Data Station Dir TotFld Noise Grad Time Uncor Notes 10 W56491 22 0 26 2 59 07 17 55 9 28571 W 56491 63 0 28 1 54 07 17 55 8 57143 W 56488 17 0 27 1 94 07 17 56 7 85714 W 56488 55 0 26 2 77 07 17 56 7 14286 W 56486 25 0 28 2 78 07 17 57 pipe 6 42857 W 56484 66 0 27 4 17 07 17 57 5 71428 W 56481 91 0 24 5 49 07 17 58 5 W56478 620 26 6 36 07 17 5...

Page 134: ...t just retrieves your manually entered NOTES and macros In the output it shows them with their respective line and station values For example from the data in the PRN file on the previous page you would see the following Y Line 0 00000 N X Stn 7 14286 W pipe ...

Page 135: ...tions program in order to receive data From the Main operating display of the ENVI MAG 3 Move the cursor to the OUTPUT field 4 Press the ENTER key and you will see the following status window 5 Press the START key to upload your data to the computer You will see a confirmation message that the operation is taking place MODE t fld DUR 0 5s TUNE FIELD 60000 AUTO TUNE yes 9600 8 1 n TM DT OUTPUT BASE...

Page 136: ...the RS 232 cable SCINTREX P N 745 081 2 To receive data start your ENVIMAP or other communications program Output setup From the Main operating display of the ENVI MAG 3 Press the AUX LCD key ESC LCD Intensity 1 Data Output 2 Factory Test 0 3 Lock OFF 4 Reprogram System Select function 4 Press the 1 key to get the START output of display START of BY LN yn all data recorded LN llll l d MAG t fld gr...

Page 137: ...AG must match the baud rate on the output device for successful communication 8 Leave DL at 0 and BIT 8 9 Move the cursor to FMT 10 Select the desired output data format see Output formats on page A6 1 Caution If some characters are lost during the dump an occurrence in particular to some printers it may be necessary to set the delay DL to a value between 0 and 999 The actual value has to be estab...

Page 138: ...ll data At the START output of display proceed as shown START of BY LN yn all data recorded LN llll l d MAG t fld grad base BAUD bbbbb DL tttBIT b FMT xxxxx Output START BATT bbb 1 Press the NEXT key until the cursor rests within the left sub page 2 Move the cursor to all data recorded 3 Press the START key Options Press the STOP key to temporarily suspend dumping Press the ESCAPE key to abort the...

Page 139: ... t fld grad base BAUD bbbbb DL tttBIT b FMT xxxxx Output START BATT bbb 1 Press the NEXT key until the cursor rests within the left sub page 2 Move the cursor to one of the three data types at the MAG field T FLD GRAD BASE 3 Press the START key Options Press the STOP key to temporarily suspend dumping Press the ESCAPE key to abort the dump locations output ...

Page 140: ...tions block 2 Move the cursor to BY LINE 3 Select YES to activate this function 4 Move the cursor to LN 5 Enter the desired Line number and direction 6 Press the NEXT key until the cursor rests within the left sub page 7 Move the cursor to one of MAG T FLD GRAD BASE 8 Press the START key Options Press the STOP key to temporarily suspend dumping Press the ESCAPE key to abort the dump 9 Repeat steps...

Page 141: ...This allows multi day sur veys to be corrected to the same set of control values However this also requires you to collect all of the TIE PT data before you start surveying the rest of the grid Basic mode From the Main operating display 1 Move the cursor to ERASE MEMORY 2 Press the ENTER key 3 You will be asked to confirm that you actually want to erase all the data from memory by pressing the Y k...

Page 142: ... 2 TIE DATA instrument setup MAG SETUP menu AUTO ST INC yn LINK REC START yn CYCLE REPEAT yn CYCLE DELAY yn ERASE MEMORY yn HEATER yn Mem erase 1 DATA 2 TIE DATABATT bbb Options 1 DATA This will only clear the current days data and leave any TIE PT data in the memory for the next day s use 2 TIE DATA This will clear all of the data including the TIE PT data 5 You will be asked to confirm that you ...

Page 143: ...strument draws a small current even when turned off If the ENVI MAG is left in a discharged state for even a few days then the battery will eventually deep discharge Once this has happened you will need to replace the deep discharged battery with a new one SCINTREX part no 400 078 or 400 080 Warning The small current drain just mentioned above is the reason why the battery MUST BE DISCONNECTED FOR...

Page 144: ... as follows One battery 1 Connect the charger to the power outlet Adjustment for different line voltages are made automatically 2 Connect the charger to the charger input connector 3 Flip the switch on the charger to On 4 Observe the charging light at the left hand side of the ENVI MAG console It will be On while charging at a high rate and turn Off when the battery is nearly charged Figure A 43 C...

Page 145: ...Connect the charger to the power outlet Adjustments for different line voltages are made automatically 5 Connect the charger to the charger input connector 6 Flip the switch on the charger to On 7 Observe the charging light at the left hand side of the ENVI MAG console It will be On while charging at a high rate and turn Off when the battery is nearly charged Figure A 44 Location of the auxiliary ...

Page 146: ...sealed A cartridge filled with a drying agent desiccant is located under the battery cover refer to Figure A 44 on page A7 3 for the exact location The desiccant should be dried out periodically as required A spare cartridge is supplied as part of the Minor Spare Parts Kit To dry out the cartridge 1 Place the console face down onto a flat smooth surface 2 Unscrew the screws at both sides of the ba...

Page 147: ...ry Pack Two fuses holders are provided under the battery cover of the ENVI MAG as shown in Figure A 44 on page A7 3 One is for a 1 5 A quick standard North American fuse Scintrex P N 512 018 The other fuse holder is for a 5 x 20mm European fuse Caution ONLY one fuse may be in place at any given time The fuse in the External Battery Pack Scintrex P N 512 049 is a standard 5 A automotive fuse ...

Page 148: ...he instrument on the surface 9 Turn the console over 10 Lift off the front panel carefully 11 Place it to the left of the console 12 Take care of the cable 13 Clean all connecting surfaces before re assembly including the O rings under the eight screws 14 Make sure that the wires coming from the power connector located at the bottom left hand side of the display module are placed side by side and ...

Page 149: ... can be removed after the cable clamp has been unscrewed to get access to the pins It is a good practice to tape up the connector again when repaired The proper connections are indicated in the following table Cable Wire Color Connector Pin Total Field 780 547 780 550 Shield Bare K White G Gradiometer 788 028 Shield Bare A Green C Red G White H Black K Base Station 780 546 Shield Bare A White G Bl...

Page 150: ...h one you are using Instrument shuts off immediately Low battery Charge battery Fuse blows after the start of a reading Short circuit in sensor cable Repair sensor cable Display is very slow Display is too cold Turn on the LCD heater using the AUX LCD button to access option if the ambient temperature is below minus 15 C Display is invisible Incorrect LCD intensity setting 1 If no data is in the i...

Page 151: ...r cable is broken Repair sensor cable Improper sensor orientation Make sure that either the N or S mark on the sensor points to magnetic North High gradient 1 Monitor the Numeric Page 2 display bar chart 2 Readings may be impossible to make in this situation External interference e g power line Readings may be impossible No fluid in the sensor shake and listen for sloshing sound Contact SCINTREX P...

Page 152: ...r data that you have mea sured i e asking for base or grad when t fld recorded 2 Select dump all records No matching line number Set proper line number or disable line by line dump Base station correction does not work Base unit and mobile unit not properly interconnected Interconnect units via Null Modem No matching date or time Correction must be made externally on a computer Cannot recall data ...

Page 153: ... Tuning Fully solid state Manual or automatic keyboard selectable Reading period 0 5 sec 1 sec 2 sec Cycle time Base Station Internal The minimum is determined by the reading period max 9999 s in 1s intervals External Any as long as it exceeds the reading period and is initiated by a command at the RS 232 interface Cycle delay The minimum is determined by the reading WALKMAG period max 8 s in 1 ms...

Page 154: ...orm Up to 178 readings in graphic form Display shifts screen when full Data output interface RS 232C interface 600 to 57600 Baud 7 or 8 data bits 1 start 1 stop bit no parity format Selectable carriage return delay 0 999 ms to accommodate slow peripherals Handshaking is done by X On X Off Data output format Data dump of all acquired data in memory or on a mode by mode and line by line basis in XYZ...

Page 155: ...id battery Approximate battery life is 40000 readings as a WALKMAG at 25 degree C External input for base station operation Battery charger 110 V 230 V 50 60 Hz Environmental Range 40 to 60 degree C Humidity 0 100 Fully sealed Easy to exchange desiccant cartridge Console dimensions 250 mm x 152 mm x 55 mm 300 mm x 152 mm x 82 mm overall Console weight 2 45 kg Sensor dimensions 70 mm diameter x 140...

Page 156: ...88 040 Staff Supporting Kit for Base Station 788 025 External Heavy Duty Battery Kit 788 026 Minor Spare Parts Kit 788 030 Major Spare Parts Kit 788 031 Recorder Cable 788 027 Grad Sensor Cable 788 028 External Power Cable 788 029 Total Field Sensor Cable short 780 547 Total Field Sensor Cable long 780 550 Base Station Sensor Cable 780 546 RS 232 Cable 745 081 Null Modem 210 154 Charger 400 139 Ba...

Page 157: ...s of shipment from our plant Repair When to ship the unit Please do not ship your instrument for repair until you have communicated the nature of the problem to our Customer Service Department by tele phone facsimile or correspondence Our Customer Service Department may suggest certain simple tests or steps for you to do which may solve your problem without the time and expense incurred in shippin...

Page 158: ...Please do not ship the instrument with the batteries installed FURTHER DAMAGE MAY RESULT U S A Instruments for repair in the United States should be shipped to SCINTREX 85 River Rock Drive Unit 202 Buffalo NY 14207 Canada Instruments within Canada should be shipped to SCINTREX Limited 222 Snidercroft Road Concord ON L4K 1B5 Outside Canada U S A Instruments shipped for repair from outside Canada an...

Page 159: ... the outside of the package one set attached to the air waybill SCINTREX instruments are manufactured in Canada consequently there is no customer duty payable in Canada It is advisable to state on the customs documents the following Canadian Goods Returned to Canada for Repair Name of the equipment Value Serial Number Reason for return Packaging and weight ...

Page 160: ...Reference A8 8 ENVI MAG Manual ...

Page 161: ...riation B1 7 Micro pulsations B1 8 Magnetic storms B1 9 Removing magnetic variations B1 10 Magnetic targets B1 11 Induced and Remanent magnetism B1 12 Survey planning B2 1 Introduction B2 1 Sampling intervals B2 1 Line and Station spacing vs Anomaly width B2 2 Precision and Accuracy of surveys B2 3 Noise B2 3 Tuning B2 4 Survey mode B2 4 WALKMAG B2 4 Stop and Go B2 5 Gradiometer B2 6 Field observa...

Page 162: ...mode B3 7 Note taking B3 7 Surveying in the WALKMAG mode B3 7 Sensor mounting and orientation B3 8 Sensor orientation B3 8 Rough terrain B3 9 Station lag and Herring boning B3 9 Surveying in the Stop and Go mode B3 10 Magnetic cleanliness B3 11 Monitoring your data B3 11 Post survey procedures B3 11 Clean up site if required B3 11 Data correction B3 11 Data transfer B3 12 Processing data B3 12 Fie...

Page 163: ...d as a large magnet with the north pole pointing south that is why the needle on your compass points north because it is attracted by a magnetic pole of opposite sign Figure B 1 on page B1 2 illustrates the magnetic field of the Earth The Earth s field at any given point on the Earth is vector in that it has a preferred orientation direction and an amplitude intensity The inclination and declinati...

Page 164: ...de measures is the projected amplitude of the total field T in the direction of the dominant Earth s field This is displayed as the intensity in nanoTeslas by the instrument Note No directional information concerning the field of the local magnetic disturbances can be inferred from a total field intensity measurement With the ENVI MAG you can measure not only the total field intensity but also the...

Page 165: ... viewed in terms of vectors as previously described for Figure B 2 When this is measured and plotted against the measuring location you may see a profile of values as illustrated in Figure B 2 showing a local disturbance of 10 nT It is very important to note that the vector of the local disturbance can be in any direction This is always the case with buried drums as we shall see in Chapter 3 Figur...

Page 166: ...Applications B1 4 ENVI MAG Manual Figure B 4 The intensity of the Earth s magnetic field ...

Page 167: ...sented as simple assemblages of magnetic monopoles or dipoles Figure B 6 on page B1 6 illustrates the magnetic field lines around typical dipole and monopole bodies and the resulting total field with the Earth s magnetic field added A confined body is illustrated on the left whereas a long and infinite body is illustrated on the right The fall off rates for a dipole or line of dipoles would vary a...

Page 168: ...ction of the Earth s magnetic field The amplitude on the other hand is controlled by a combination of the susceptibility permanent magnetization and the distance from the body that you are observing the response The more magnetizable the object is the stronger and narrower the peak on the profile will be The deeper the object the weaker and broader the peak on the profile will be This is illustrat...

Page 169: ...s not constant As the Earth rotates the outer layers of the ionosphere interact with the solar wind to cause minor fluctuations in the magnetic field Depending upon the duration and intensity of these fluctuations they are given different names Diurnal variation Fluctuations with a period lasting about one day are called diurnal variations These can be considered much like tides that ebb and flow ...

Page 170: ...ic field are called micro pulsations These can range in intensity from a few through to tens or even hundreds of nanoTeslas in intensity as can be seen in the next figure Figure B 9 These can present a problem when you are surveying in that they may appear similar to anomalies caused by buried objects Figure B 9 Typical micro pulsations after Breiner 1973 ...

Page 171: ...ch like weather forecasts from several agencies worldwide through an international network of centres called the IUWDS International Ursigrams and World Days Services There exist ten regional warning centres RWC s that provide geomagnetic activity information to the scientific and user communities within their own region Please note that not all of these centres provide the same services and forec...

Page 172: ...ensive as two complete instruments are required 2 Use a tie point method while doing the total field survey This assumes that the field is changing slowly and evenly between the first time you measured the value at a station and the next time you check in to that station again This method is not as accurate as using a base station but if the field is not changing rapidly it is quite adequate to lo...

Page 173: ...ck pack mounted total field WALKMAG survey mode The different correction methods such as the base station and tie line methods are explained extensively in the next chapter of this manual Most environmental applications do not require the use of a base station as the grids are relatively small and can be covered in a very short time In this case tie point line or loop methods are adequate Magnetic...

Page 174: ...ry with them a magnetic memory of their orientation when they were created Unfortunately this can lead to complications Induced and Remanent magnetism The local disturbance caused by a buried drum a pipeline or a sheet can be represented as a vector The disturbance can also be further decomposed into two components an induced and a permanent or remanent component The ability of a ferrous object to...

Page 175: ...s component can have any orientation and intensity Therefore the resulting total field vector can have any orientation and intensity which can have serious consequences on your magnetometer survey Remember that it is the projected vector COMPF that is measured by the magnetometer Consider for instance the examples illustrated in the following figure Figure B 12 You can see that depending upon the ...

Page 176: ...d total field resulting in no anomaly at all Case c is the most interesting because even though an anomaly exists it cannot be measured You may want to keep this in mind when carrying out a magneto meter survey for buried drums pipelines or metal sheets These are only simplified examples Some situations for instance a collection of drums each having it s own orientation and intensity for the local...

Page 177: ...the first ten metres of the surface The anomalies created by such buried drums pipelines or sheets of metal can produce relatively intense and narrow anomaly profiles However as mentioned in the previous chapter page B1 7 the deeper the target the broader the anomaly will be Further the anomaly will become less intense when the magnetized body is at greater depths Larger targets will have broader ...

Page 178: ... the expected width of the target In order to determine the strike length of a body the same holds true for the line spacing it should be less than half the expected length of the target in order to have at least two survey lines crossing the target This detectability threshold of twice the sample spacing is sometimes referred to as the Nyquist frequency in more advanced magnetic data processing T...

Page 179: ...e sources if strong enough can seriously hamper any magnetometer survey Therefore surveying directly under power lines since they will disturb the magnetic field you are trying to measure can be problematic Other sources of cultural noise in typical waste dumps are the many buried ferrous objects near the surface Some of these objects such as tin cans bed springs appliances etc can introduce unwan...

Page 180: ... electrical interference Fixed tuning is also recommended for base station applications or for exploration surveys where there are only low intensity variations in the magnetic responses Environmental surveys are also prime candidates for fixed tuning since they are usually conducted in areas of large cultural noise electrical or large magnetic gradients due to the close proximity of the magnetic ...

Page 181: ...ations it is preferable to operate in the stop and go mode with automatic station incrementing Data for this case would be taken typically at a 15 metre 50 feet station spacing remember you need at least two points to define an anomaly which is why the station spacing is half that of the expected depth This is illustrated in the following figure Figure B16 which shows the set up of a stop and go s...

Page 182: ... a difference in magnetic fields However especially for environmental applications it is more sensitive to near surface objects which can be a disadvantage The following figure Figure B17 illustrates the set up for a gradiometer survey Figure B17 Set up for a gradiometer survey in the Stop and Go mode Field observations Finally to help in the interpretation of the final data it is very important t...

Page 183: ...row structures such as are encountered in mineral exploration applications the survey lines are laid out along perpendicular to the strike therefore optimizing the coverage of each line Long structures or bodies which are aligned in a parallel fashion are not usually encountered in environmental applications except pipelines the direction of the targets are most often random Consequently most envi...

Page 184: ...Applications B2 8 ENVI MAG Manual ...

Page 185: ...urvey do s and don ts Laying out the grid A survey grid usually consists of a base line and one or several tie lines The base line serves as a zero reference line for the grid and the tie lines serve to correct the skewness of the survey lines From the base line are drawn survey lines perpendicular to the base line With a square survey grid the station separation on each line is identical to the l...

Page 186: ... done using a chain 50 or 100 metre measuring tape Major intervals such as 5 or 10 metre lines can be marked with pickets or flags for a more prominent visual reference 2 Then mark each survey line with wooden stakes driven into the ground The heads of the stakes should preferably be marked with fluorescent paint The base line implementation is illustrated in the following figure Figure B 19 ...

Page 187: ...lagging tape to mark you survey stations For typical environmental applications the stations may be at every 10 metres You may also choose not to mark every survey line but only survey lines every 5 metres The position of the intermediary survey lines would be approximated by the operator This is illustrated in the following figure Figure B 20 Figure B 20 Typical flagged survey line 10 E 5 E 0 0 1...

Page 188: ...If identical line numbers are present on different grids we strongly recommend that you enter a different line number for the second identical line You can systematically shift the line by either adding a digit in the least significant location or offsetting the line by adding a large value such as 1000 For instance if you have two lines 100E one on grid A and one on grid B the second line 100E on...

Page 189: ...ever it should ne noted that neither of these methods are as accurate or precise as the base station correction A technical paper on this subject Magnetic Correction Techniques is available from SCINTREX The tie point line method uses data collected along the base line or rarely tie lines as reference points to correct for the diurnal drift of magnetic data The following figure Figure B 21 on page...

Page 190: ...diurnal drift The sequence of collecting data for this method is illustrated in the following figure Figure B 22 You may note that the more lines you have to survey the longer it will take for you to get to the reference station to get the control reading Compare this to the tie point line method shown in the previous figure Figure B 21 Figure B 22 Typical tie point method in loop mode survey ...

Page 191: ...mber what was present at the specific location you run the risk of having the cultural feature mistaken for a real anomaly The taking of notes is done quite easily with the ENVI MAG using the NOTE key You can pre enter a choice of five cultural noise sources macros that you are most likely to encounter during the survey The complete description of setting up this feature can be found in the instru...

Page 192: ...lf as spikes in the data Furthermore for your own comfort and convenience the sensor cable extending from the sensor bottle to the instrument should not be left dangling because you could trip over it Either tape the extra cable in a knot or hold it in your hand Avoid shaking the sensor bottle while surveying as this will also introduce instrumental noise which is impossible to remove Sensor orien...

Page 193: ... age of your grid Station lag and Herring boning The measurement that you make with the ENVI MAG does not take place im mediately due to the cycle time of the instrument which is at best 0 5 sec onds Consider also that during a WALKMAG survey you the operator are continuously moving Is there going to be a problem when you change direc tions With some other instruments this inherent lag in the data...

Page 194: ...ations The following figure Figure B 25 illustrates a staff mounted sensor used in the stop and go mode Figure B 25 Staff mounted sensor set up Again certain points should be mentioned about this type of survey it is important that the sensor cable does not dangle for the same reasons as mentioned for the WALKMAG mode the sensor staff should be held at arm s length when taking a measurement it is ...

Page 195: ...your base station with this feature These features are well explained in the operations manual section and you should refer to this section starting on page A3 30 for further details Post survey procedures Clean up site if required Once the data is collected it is a good procedure to remove all stakes and markings left behind therefore avoiding further damaging the environment Data correction The ...

Page 196: ...n the case of multiple grids it is recommended that processing be done for each grid separately You will have to manually edit your data file into separate data files for each grid The steps to producing a contour map or individual profiles are well explained in the third section of the manual on the ENVIMAP software Further processing of the data can be carried out using the optional GEOSOFT map ...

Page 197: ...rgets between 0 5m and 2 0m required a tight grid spacing be chosen Ideally a square grid with a line spacing of one 1 metre should be used for this type of site This was the case For the same reason the WALK MAG mode with readings taken every 0 5 seconds and stations updated every 10 metres was used for this type of site ...

Page 198: ...r mode Figure B 27 Surveying the Columbia test site in the gradiometer left and WALKMAG right modes The results are presented in the following captions in contoured data form for the total field survey and in profile form for the gradiometer survey Figure B 28 illustrates the contoured total field data and Figure B 29 the contoured vertical gradiometer data ...

Page 199: ...Field example ENVI MAG Manual B3 15 Example Figure B 28 Columbia test site total field contoured data ...

Page 200: ...Applications B3 16 ENVI MAG Manual Figure B 29 Columbia test site vertical gradient contoured data ...

Page 201: ...73 Applications Manual for Portable Magnetometers Geometrics Sunnyvale California 58 pp Landry B Mercier M 1983 Notions de Géologie Modulo diteur Outremont Québec 426 pp Westphalen O and Rice J 1992 Drum Detection EM vs Mag Some revealing tests Proceedings of the 6th National Outdoor Action Conference p 665 688 Telford W M Geldart L P Sheriff R E Keys D A 1976 Applied Geophysics Cambridge Universi...

Page 202: ...Applications B3 18 ENVI MAG Manual ...

Page 203: ...r requirements C2 1 Installation procedure C2 2 STEP 1 Running the INSTALL program C2 2 STEP 2 Product registration C2 3 STEP 3 System configuration C2 3 Menu usage overview C2 4 The ENVIMAP interface C2 4 The menu screen C2 5 Using the keyboard and mouse C2 6 Using the keyboard C2 6 Using the mouse C2 7 Configuring C2 8 RAM disks and GEOTEMP C2 9 STEP 4 Selecting your video card type C2 10 STEP 5...

Page 204: ...ce C3 1 Limitations C3 2 Data XYZ files C3 2 Viewing the plots C3 2 Final map size C3 2 Menu system C3 2 The ENVIMAP interface C3 2 The menu screen C3 3 Using the keyboard and mouse C3 4 Using the keyboard C3 4 Using the mouse C3 5 Pick Lists C3 6 File lists C3 7 The DOS command window C3 8 Shelling to DOS C3 9 Menu reference C3 10 System Configuration C3 10 AUTOEXEC BAT and CONFIG SYS C3 10 Video...

Page 205: ...ues at that position For ENVI MAG data there are two possible Z values 1 Total field the total magnetic field in nanoTeslas nT 2 Gradient the gradient rate of change of the total magnetic field in nanoTeslas per metre nT m Processing system steps The sequence of steps in using the processing system are 1 Prepare the data The data must first be collected using the ENVI MAG see Section B Application...

Page 206: ...the data and to be used later in composite plots 4 Plot the map Final maps can be plotted on a variety of common PC printers Conventions used in this section The following typeface conventions are also used in this section in addition to those in use throughout this manual See Type styles on page vii Convention Use Monospaced A filename environment variable directory menu selection or any computer...

Page 207: ... following minimum resources 1 640Kb of RAM memory 2 DOS operating system version 3 1 or greater 3 hard drive 4 one floppy disk drive either 3 or 5 5 EGA or VGA video capabilities 6 parallel printer port 7 serial port 8 8 wide Epson compatible dot matrix or HP PCL compatible laser printer Other requirements 1 Your copy of the ENVIMAP System has been delivered with disks that match your floppy driv...

Page 208: ...drive install_drive install_directory Where For example or You will be prompted to insert each disk into the source drive as they are needed source_drive Is the floppy disk drive usually A or B in which the INSTALLATION DISK is placed install_drive Is the hard drive to which the system will be installed usually C install_directory Is the destination path directory into which ENVIMAP will be instal...

Page 209: ...puters are located This information comprises your user identification and is recorded permanently on the INSTALLATION DISK for future reference Once recorded it cannot be changed Note Store the INSTALLATION DISK in a safe place Should your ENVIMAP files ever be erased they can only be recovered by running your original INSTALLATION DISK in drive A or B exactly the way you did before in STEP 1 Run...

Page 210: ...ious menus This section will cover the various aspects of the ENVIMAP interface and how to use it If you are already comfortable with using menu systems then you can jump to the next section Configuring on page C2 8 to finish your setup of the ENVIMAP system ENVIMAP Version 3 02 00 E N V I M A P Instructions 1 Use the cursor keys or mouse to highlight menu items 2 Press Enter or double click mouse...

Page 211: ...this line indicate what actions are avail able to you The actions are triggered by either pressing the F key in combination with the highlighted letter on the button or by clicking on the button using the mouse 5 Status bar this line displays your current working directory and any ENVIMAP messages ENVIMAP banner Menu banner Menu section Button bar Status bar ENVIMAP Version 3 02 00 E N V I M A P I...

Page 212: ...be presented with a dialogue screen that prompts you for additional information Some of the items on the dialogue screen only allow certain entries that can be selected from a list These entries can easily be distinguished by the appearance of a double headed arrow or a down arrow to the left of the field when highlighted To activate the list for an appropriate field press Fl You then select the d...

Page 213: ...re available whenever the highlighted field has a double ended arrow or a down arrow to the left of it Help By clicking on the HELP button of the buttonbar a help message per taining to the highlighted field appears This message will stay on the screen until you either click anywhere inside of the Help box or click the RIGHT mouse button Point This action means that you should move the screen poin...

Page 214: ...l path on your computer that you would like ENVIMAP to use for its temporary files The default is C and should be fine in most cases You can also use a RAM drive to speed up operations See RAM disks and GEOTEMP on page C2 9 Note This temporary area should have a minimum of 2Mb free space and you must specify a drive Do not leave this blank ENVIMAP Version 3 02 00 ENVIMAP System Congiguration This ...

Page 215: ...TEMP Note We recommend the use of SMARTDRV or other third party disk caching software instead of RAM drives If you have more than 3 Mb of RAM it can be used as a RAM disk and GEOTEMP can be set to use this disk as the paging area To set GEOTEMP to drive D assuming your RAM disk has been assigned to drive D enter D at the screen prompt as shown in Figure C 3 on page C2 8 during configuration If you...

Page 216: ...guration option This will bring up the screen as shown in the following Figure C 4 You will be able to also choose your printer and indicate the port to which it is connected The next step requires you to select the type of video card you have in your computer in order to be able to preview the graphics output The two currently supported modes are EGA and VGA You can either type in the strings EGA...

Page 217: ...rinter is physically connected to Please activate the pick list and select the port Usually you can select PRN the default if you are uncertain 3 Activate your selections You must now activate both the video and printer selections by either pressing Fg or by clicking on the Go button ENVIMAP Version 3 02 00 Select Video and Printer printers Video Graphics Alt L Printer Alt L 9 pin letter 8 5x11 8 ...

Page 218: ...elephone and fax numbers are on the cover page or See HELP Line on page C ix Re boot the system by simultaneously pressing the GFU keys to complete this stage of the installation Note To complete the installation you must go through each installation option and select the settings appropriate to your system Congratulations You are now ready to process your ENVI MAG data ...

Page 219: ...ENVIMAP installation by comparing the destination directory with the existing ENVIMAP environment variable If the installation is to a new directory the AUTOEXEC BAT and CONFIG SYS files on drive C are modified the ENVIMAP environment variable is set and the ENVIMAP directory is added to the beginning of the system PATH 5 You are prompted for your name your company name and the city in which the l...

Page 220: ...VIMAP C ENVIMAP where C ENVIMAP is assumed to be the directory in which you wish to install ENVIMAP 4 Copy the file PKUNZIP EXE from the INSTALLATION DISK 5 Enter PKUNZIP A 1000 This will expand the installation files into the ENVIMAP directory assuming that the source disk drive is A 6 Enter ENVIMAP to start the program 7 Select the SYSTEM CONFIGURATION menu 8 Configure your system by selecting a...

Page 221: ...arate each parameter by a space not preceding the destination directory by a character including a disk drive designation with the destination directory The command you entered is displayed on the screen followed by the correct syntax and a correct example Check your command carefully to determine the error 2 PKUNZIP EXE was not found on the installation diskette This can only be caused by a corru...

Page 222: ...load SUSHIØ EXE when trying to run ENVIMAP This error is caused by the ENVIMAP environment variable being set incorrectly Use the DOS command SET to determine the presence of a GEOSOFT environment variable and its setting You must change or add the command SET GEOSOFT C ENVIMAP to the AUTOEXEC BAT file in your boot directory where C ENVIMAP is the full path of the directory in which you installed ...

Page 223: ...If you have problems ENVI MAG Manual C2 17 Installation If it is not set to the ENVIMAP directory Press Fc Enter CD directory where directory is the name of the ENVIMAP directory ...

Page 224: ...he directory where you loaded ENVIMAP you must modify your AUTOEXEC BAT file to correctly set the system path The installation procedure attempts to make this change automatically but some AUTOEXEC BAT procedures are too complex for the installation procedure to get this right Please carefully review what your AUTOEXEC BAT is doing If you did not configure your system find the person who did and e...

Page 225: ...t to a printer Try re installing the device by 1 Setting the default directory to the ENVIMAP directory 2 Run ENVIMAP 3 Select the System Configuration option 4 Select the Video and Printer Setup option 5 Select Printer and choose the appropriate printer from the list ...

Page 226: ...ature algorithm i e random gridding contour these grids suppress contours in high gradients areas and label contours add a customized surround to the resulting contour plot including an annotated reference grid North arrow suitable scale bar and a brief title block preview plots on an EGA or VGA compatible computer create hardcopy output line plots only on standard Epson compatible dot matrix HP P...

Page 227: ... x 480 Final map size The actual limit of any given plot is dependent on the printer selected The largest physical size is ledger 11 x 17 inches or A3 267 x 366 mm metric The maps are automatically scaled to the size of paper used by the printer selected Menuing system The ENVIMAP system is entirely menu driven with context sensitive help Its design allows you to process and create plots without r...

Page 228: ...s line indicate what actions are available to you The actions are triggered by either pressing the F key in combination with the highlighted letter on the button or by clicking on the button using the mouse 5 Status bar This line displays your current working directory and any ENVIMAP messages ENVIMAP banner Menu banner Menu section Button bar Status bar ENVIMAP Version 3 02 00 E N V I M A P Instr...

Page 229: ... presented with a dialogue screen that prompts you for additional information Some of the items on the dialogue screen only allow certain entries that can be selected from a list These entries can easily be distinguished by the appearance of a double headed arrow or a down arrow to the left of the field when highlighted To activate the list for an appropriate field press Fl You then select the des...

Page 230: ...lable whenever the highlighted field has a double ended arrow or a down arrow to the left of it Help By clicking on the HELP button of the buttonbar a help message pertaining to the highlighted field will pop up This message will stay on the screen until you either click anywhere inside of the Help box or click the RIGHT mouse button Point This action means that you should move the screen pointer ...

Page 231: ...ist that can be scrolled up or down to select the desired item 1 Use the CB keys to move the highlight bar to the desired option 2 You then must press K to select it The presence of the arrows on the scroll bar to the right of the options indicates that there are more to choose from than those displayed in the window How to cancel If you do not wish to make a selection simply press the P key to cl...

Page 232: ...our RIGHT mouse button File lists File lists enable you to quickly highlight the required file and saves you the bother of having to remember the exact name along with the full path to the file Entries where file lists are available are identified by the down arrow to the left of the field when the option is highlighted A sample file list follows Figure C 8 ENVIMAP file pick list ENVIMAP Version 3...

Page 233: ... either the P or Fc keys With the mouse 1 click on the appropriate field 2 make the appropriate entry The default file extension is always shown in the File List title box at the top of the window frame 3 click on the Ok button when you are satisfied with the file choice To cancel the choice click on the Cancel button or press the RIGHT mouse button The DOS command window The ENVIMAP system also a...

Page 234: ... rather than going through them one at a time via the Command window you can shell entirely out to DOS for as long as you like This is accomplished by pressing Fd or by clicking on the DOS button when it is available on the Button bar Returning to ENVIMAP To get back to the ENVIMAP system you must 1 enter EXIT at the DOS prompt 2 press K ENVIMAP Version 3 02 00 E N V I M A P Instructions 1 Use the...

Page 235: ...ere enter the disk with the most space available If you only have a single drive this will usually be C This will then tell ENVIMAP to use the drive s root directory that you specified for creating temporary files You cannot leave this blank AUTOEXEC BAT and CONFIG SYS ENVIMAP Version 3 02 00 ENVIMAP System Congiguration This procedure modifies your AUTOEXEC BAT and CONFIG SYS files as follows AUT...

Page 236: ...rix Hewlett Packard PCL compatible laser and some HP compatible ink jets Please contact SCINTREX ENVI technical support if you cannot get your printer to work with one of these configurations Printer Port You must inform ENVIMAP to which port output should be directed The default is to PRN and you should not change this unless you know for certain that your device is connected to another port Vide...

Page 237: ...SCINTREX for the optional DOWNLOAD program Figure C 12 Communication configuration with the ENVI MAG Filename The name of the file to receive the ENVIMAG data This file will automatically be assigned an XYZ extension Dump instrument data ENVIMAP Version 3 02 00 Dump the ENVI MAG memory to an XYZ data file on the computer Review ALL the following steps before proceeding 1 Enter the name of a file i...

Page 238: ...ata files screen All the selections on this screen have file lists attached so that you can easily merge data from various directories and drives Merge data files ENVIMAP Version 3 02 00 Merge two or more XYZ files into a single XYZ file This may be necessary if data from a project has been collected over two or more days merge XYZ file XYZ assumed plus XYZ file plus XYZ file plus XYZ file plus XY...

Page 239: ...en 3 Select dialogue items that you want to change 4 Press Alt H or click on Help for parameter help 5 Press F1 Alt L or click on LIST to display lists of options or lists of files 6 Press Alt G or click on GO to complete a dialogue entry screen System Configuration Draw the map Prepare the data Create a map Map surround options Plot Reference grid options Contour options Command Dos Help eXit G E...

Page 240: ... that will automatically display the contour map on the screen once processing is finished Ground Units You can either specify feet or metres as your ground units The following entries affect the appearance of your map Sheet Orientation You can specify either a Landscape or Portrait orientation for your output map sheet Title This will be the main title of your map It will be plotted in the centre...

Page 241: ...s of how the data fit on the page This will always produce same size plots on the same printer data plus margins will adjust the size of the frame to the size of the data which will always be the same or smaller than the printer page Map surround options ENVIMAP Version 3 02 00 Map surround graphics details Plot a map frame single line Frame to fit sheet size Show scale bar YES ground units meters...

Page 242: ...bottom centre portion of the map 4 X offset This option allows you to specify how much in centimetres on the plotted map to offset the scale bar in the horizontal direction from the reference point mentioned above A negative offset will be to the left 5 Y offset This option allows you to specify how much in centimetres on the plotted map to offset the scale bar in the vertical direction from the r...

Page 243: ... degrees west of north would be either 12 W or 12 5 Locate relative to map You can specify either the bottom right bottom centre or bottom left of the map as the location to plot the scale bar Note The Titles are always plotted in the bottom centre portion of the map 6 X offset This option allows you to specify how much in centimetres on the plotted map to offset the north arrow in the horizontal ...

Page 244: ... spacing is not suitable you can specify your own in ground units Note If you select a spacing that is too narrow the grid annotations may overlap Reference grid options ENVIMAP Version 3 02 00 REFERENCE GRID A reference grid can be overlayed on the plot to provide a ground coordinate reference Station markers may also be plotted Station markers are symbols plotted on the map to show the location ...

Page 245: ...drawn through the data area You have a choice of dotted or solid lines crosses at reference grid line intersections or nothing The default is not to plot a background grid Station Markers This group of options allows you to place markers at all locations where readings where taken for reference purposes 1 Show Station Markers A YES or NO option 2 Marker Symbol You can choose from six different sym...

Page 246: ...data will be contoured at increments of the primary contour interval If this is not specified an appropriate contour interval will be automatically chosen We recommend that the first time a data set is contoured the defaults should be used Adjustments can then be made as necessary For example to contour at 10 nT intervals enter 10 Contour options ENVIMAP Version 3 02 00 Gridding and contouring par...

Page 247: ...ed out Gridding options In order to produce a contour map the data must first be interpolated to values at the nodes of an even grid The distance between the grid nodes is referred to as the grid cell size The cell size is in ground units 1 Grid cell size A suitable grid cell size is chosen automatically for the data If the contours appear to be too angular try to reduce the grid cell size until a...

Page 248: ...n the specified tolerance value for all the points in the mesh or when the maximum number of iterations have been reached The default tolerance is 0 1 of the input data range Hint To improve a surface fit you must either reduce the tolerance value or increase the maximum number of iterations or both 4 Maximum iterations This specifies the maximum number of times the grid mesh will be adjusted to g...

Page 249: ...vailable Screen Preview ENVIMAP Version 3 02 00 E N V I M A P Instructions 1 Use the cursor keys or mouse to highlight menu items 2 Press Enter or double click mouse to select a menu item and enter a dialogue entry screen 3 Select dialogue items that you want to change 4 Press Alt H or click on Help for parameter help 5 Press F1 Alt L or click on LIST to display lists of options or lists of files ...

Page 250: ...onfiguration options One important option is the ability to print to a file called PLOT PRN that is available on the pick list you can use any other filename also This allows you to generate a file on a computer that has no printer attached or perhaps for a different printer than that currently attached to your PC The file can then be plotted to the appropriate device by using the DOS COPY B comma...

Page 251: ...used in the drawings In this situation you can make a BLOCK of the ENVIMAP plot and use the AutoCAD INSERT command to scale and position the map as required Figure C 22 The AutoCAD DXF output dialogue screen Plot file name Enter the plotfile name to be converted The output file will have the same name but with a DXF file extension Convert to DXF ENVIMAP Version 3 02 00 Convert a plot to an AutoCAD...

Page 252: ...Index ENVI MAG Index ...

Page 253: ......

Page 254: ...ion setup A4 20 Sample gradiometer setup A4 17 Sample INFO display setup A4 23 Sample Instrument setup A4 12 Sample Note entry A4 25 Search mode setup A5 13 setup display A3 25 Tie point correction procedure A5 19 unlocking parameters A4 28 Alphanumeric input A4 6 Alphanumeric entry A3 6 Ambient magnetic field A3 26 A4 15 Amplitude anomaly B1 6 Analog output A3 27 Anomaly amplitude B1 6 orientatio...

Page 255: ...al A2 3 standard A2 2 Battery charging A7 1 single battery A7 2 two batteries A7 3 Baud rate A3 37 C3 13 Beeper port A3 6 Blocks sub pages A3 9 Button bar C2 5 C Cables A2 2 base station A2 5 gradiometer sensor A2 6 CAD output C3 26 Car battery A2 12 Carrying strap A3 3 Cartesian co ordinates A3 16 A3 22 A3 23 Changing parameters A4 5 Charger connector A3 3 Charging light A3 3 CHART SCALE advanced...

Page 256: ... A3 3 Display advanced mode A3 36 Formats A3 38 format A3 37 A3 38 setup A6 8 Data processing B3 12 Data transfer B3 12 Datacheck v DATE advanced A3 40 Deep discharge A2 10 Delay cycle A3 24 RS 232 output A3 37 Desiccant cartridge A3 3 exchange A7 4 disk cache C3 10 Display Auxiliary A3 35 Configuration advanced mode A3 22 Data collection advanced mode A3 29 basic mode A3 17 search mode A3 21 data...

Page 257: ... B2 3 removing B1 10 DOS command executing C3 9 window C3 8 environment C2 15 shell C3 9 drum location A3 12 A3 14 A3 19 Dumping data A6 10 All Data A6 10 Line by Line A6 12 Specific data A6 11 DUR duration basic A3 13 search A3 19 DURATION advanced A3 25 DXF output C3 26 E Effects of gradient A5 2 EGA C2 10 ENTER key A3 5 A3 34 ENVI MAG base station correction A3 40 configuration menus A4 3 Instr...

Page 258: ...a output A3 37 A3 38 Free memory A3 40 Fuse Replacement A7 5 G Geomagnetic forecasts contact numbers B1 10 GEOTEMP C2 9 GO button C2 8 C3 4 Gradient A3 30 A3 31 effects of A5 2 Gradiometer B2 6 sample setup A4 17 sensor connecting cable A2 6 setup A4 17 Graphic Data Display A3 31 Graphics card EGA VGA C2 10 Grid cell size C3 22 Gridding blanking distance C3 22 cell size C3 22 iterations C3 23 tole...

Page 259: ...6 C3 4 Keypad A3 3 description A3 4 L LCD A3 3 heater A3 24 intensity A3 5 Line entering start A4 8 number A3 16 A3 23 separation A3 16 A3 23 setup A4 7 spacing B2 2 Tie point data collection A5 17 Tie point data correction B3 5 Lines repeated A5 4 LINK REC START advanced A3 24 Liquid Crystal Display A3 3 LN advanced A3 23 basic A3 16 Locking parameters A3 35 Loop Tie point data collection A5 16 L...

Page 260: ...n markers C3 20 Memory v ENVI MAG vi erasing A6 13 percent free A3 30 A3 40 Menu ENVI MAG Configuration A4 3 screen components C2 5 sections C3 3 Micro pulsations B1 8 Minus key A3 6 MODE advanced A3 25 basic A3 13 search A3 19 Modes stop and go A4 17 Tie point A5 16 WALKMAG A5 5 Mouse button actions C3 5 selecting items C2 7 C3 5 using C2 7 Multiple grids B3 4 N NEXT key A3 6 A3 9 advanced A3 29 ...

Page 261: ...ng graphic display A3 33 Parameter fields accessing A4 5 Parameters Advanced mode A3 22 basic mode A3 13 changing A4 5 communications C3 12 locking A3 35 A4 28 search mode A3 19 separation A4 8 unlocking A4 28 PATH C2 17 Performing tasks C2 8 Periodic maintenance A7 4 Pick lists C3 6 activating C3 4 Plotting C3 24 hardcopy C3 25 Plus key A3 6 Polarity A2 12 Pop up windows A3 10 Power supply AC A2 ...

Page 262: ...asic setup A5 13 data collection displays A3 21 parameters A3 19 sample setup A4 11 sample survey A5 13 Sections vii Selecting items keyboard C3 4 mouse C3 5 Sensor back pack installation A2 9 cleaning A7 4 connecting cable A2 3 connectors A3 3 orientation A2 9 parts non magnetic A2 4 total field A2 3 A2 4 SEP advanced A3 23 basic A3 16 Separation line A3 16 A3 23 parameters A4 8 station A3 16 A3 ...

Page 263: ...A5 15 design criteria B2 1 grid layout B3 1 mode B2 4 gradiometer B2 6 Stop and Go B2 5 B3 11 WALKMAG B2 4 pattern B3 4 precision B2 3 Survey lines repeated A5 4 Surveying WALKMAG mode B3 7 Symbols viii System configuration C2 8 C3 10 T Task activating C3 4 performing C2 8 Technical support ix Temporary files C2 8 Text entry A4 25 TIE basic A3 15 TIE CORRECT advanced A3 26 TIE MODE advanced A3 28 ...

Page 264: ...g B2 4 automatic A3 13 A3 19 A3 27 A4 14 fixed A3 14 A3 19 A3 27 A4 17 Type styles vii Typeface conventions vii C1 2 U Unlocking parameters A4 28 Unpacking A2 2 Upgrade kits vi V VDISK C2 9 VGA C2 10 Video card EGA VGA C2 10 Video graphics C3 11 W WALKGRAD sample survey setup A4 14 WALKMAG v A1 2 A5 3 B2 4 B3 7 Gradiometer survey A5 7 sample survey A5 5 setup A4 14 Warranty A8 5 X XYZ A3 38 A6 2 X...

Page 265: ...Index Index xiv ENVI MAG Manual ...

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