SCINTREX ENVI PRO Operation Manual

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ENVI PRO

OPERATION MANUAL

Rev.

0 Initial Release 4933 May 2009 AM

Description of

Change

ECO Date of Issue App

P/N 788715 Rev. 0

SCINTREX LIMITED

222 Snidercroft Road

Concord, ON, Canada

L4K 2K1

Telephone: +1 905 669 2280

Fax: +1 905 669 6403

e-mail: scintrex@scintrexltd.com

www.scintrex.com

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 and WALKMAG are trademarks of SCINTREX Limited.

P/N 788715 Rev. 0 ECO 4933

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Table of Contents

Chapter 1 Preface.................................................................................................1—2

Features ............................................................................................................. 1—2

Upgrades and Options .......................................................................................1—2

Chapter 2 Introduction.........................................................................................2—1

Cold Boot ...........................................................................................................2—1

Instrument Overview ..........................................................................................2—1

Chapter 3 Preparing the ENVI PRO....................................................................3—1

Unpacking ..........................................................................................................3—2

Repacking ..........................................................................................................3—2

Assembly............................................................................................................ 3—2

Connecting the magnetic sensor(s) to the cable............................................3—2

Total-field sensor............................................................................................ 3—2

Installing the terminal protective cover...........................................................3—4

Assembling the sensor / GPS staff................................................................3—5

Staff Mounted Installation............................................................................... 3—5

Back-pack Installation .................................................................................... 3—8

Battery Installation/Exchange....................................................................... 3—10

Using the external battery pack.................................................................... 3—11

Using an external power supply ................................................................... 3—12

Chapter 4 The Instrument....................................................................................4—1

Console Description ........................................................................................... 4—2

Keypad Description ............................................................................................ 4—2

Key Functions ....................................................................................................4—3

Display Screens .................................................................................................4—5

Cursor ............................................................................................................4—6

Display Blocks................................................................................................4—6

Pop-Up Windows ...........................................................................................4—7

Help Screens.................................................................................................. 4—7

Chapter 5 Operating Displays............................................................................. 5—1

Main Operating display ..................................................................................5—1

Instrument setup display ................................................................................5—3

Magnetometer setup display .......................................................................... 5—4

Data Displays ..................................................................................................... 5—8

Numeric data display...................................................................................... 5—8

Graphic data display ....................................................................................5—11

Recall Displays............................................................................................. 5—13

Recall Setup display.................................................................................. 5—13

RECALL DATA display ................................................................................5—14

Modifying the display window....................................................................... 5—15

Auxiliary Functions display ........................................................................... 5—16

Data Output Display ..................................................................................... 5—17

Data output formats...................................................................................... 5—19

NOTES display............................................................................................. 5—19

Information / GPS Setup Display..................................................................5—20

Chapter 6 Setting Up the ENVI MAG ..................................................................6—1

First Time Operation ..........................................................................................6—1

Cold Boot .......................................................................................................6—1

Configuration Menu........................................................................................6—2

HOW TO: ...........................................................................................................6—3

Access the Main Operating Display ............................................................... 6—3

Access Display Sub-Panels/Blocks................................................................ 6—3

Access the Parameter Fields ......................................................................... 6—3

Change Parameters ....................................................................................... 6—3

Select and Enter............................................................................................. 6—4

Line and Station Setup.......................................................................................6—5

Entering the Starting Station .......................................................................... 6—6

Entering the Starting Line............................................................................... 6—6

Instrument Setup............................................................................................6—7

Sample Total-Field Setup (Walkmag or Walkgrad)........................................6—8

Sample Stop-and-Go Gradiometer Setup .................................................... 6—11

Sample Base-Station Setup ......................................................................... 6—14

Information Display ......................................................................................6—17

Note Entry .................................................................................................... 6—19

Display Intensity Control .............................................................................. 6—21

Parameter Lock............................................................................................6—21

Chapter 7 Operating the ENVI PRO....................................................................7—1

Accurate and Meaningful Measurements........................................................... 7—1

Orientation...................................................................................................... 7—1

Effects of gradient .......................................................................................... 7—1

Other sources of noise ................................................................................... 7—2

On the staff..................................................................................................... 7—2

Base-station ................................................................................................... 7—2

Repeated Surveys Lines ................................................................................ 7—3

Magnetometer Operation ................................................................................... 7—4

Walkmag Total-Field/Gradiometer Automatic Mode ......................................7—4

WALKGRAD Gradiometer Survey..................................................................7—7

Manual Mode – Total-Field/Gradiometer (Semi-Automatic)...........................7—7

Automating your measurements .................................................................. 7—11

Base Station Operation .................................................................................... 7—11

Check your setup ......................................................................................... 7—12

Survey Data Correction Procedures ................................................................7—13

Using Base-Station Data..............................................................................7—13

Tie-Point (TIE-PT) Mode .............................................................................. 7—15

Loop type – collecting data ..........................................................................7—15

Line type – collecting data............................................................................ 7—16

Tie-Point Correction Procedure....................................................................7—18

Chapter 8 Data Output.........................................................................................8—1

Output Formats ..................................................................................................8—1

Notes..............................................................................................................8—4

Operation Mode .............................................................................................8—5

Dumping Data ................................................................................................ 8—6

All data ........................................................................................................8—6

Specific data................................................................................................ 8—7

Line by Line.................................................................................................8—7

Erasing data from memory .............................................................................8—8

Operation mode...........................................................................................8—9

Chapter 9 Maintenance and Repair....................................................................9—1

Battery Charging ................................................................................................9—1

One Battery ................................................................................................. 9—1

Two Batteries ..............................................................................................9—2

Periodic Maintenance......................................................................................... 9—3

Cleaning the Sensors.....................................................................................9—3

Desiccant Exchange ......................................................................................9—3

Fuse Replacement ......................................................................................... 9—4

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Console Disassembly/Assembly .................................................................... 9—4

Cable Repair .................................................................................................. 9—4

Trouble Shooting................................................................................................9—5

Chapter 10 Reference Information ...................................................................10—1

Envi Pro Technical Specifications .................................................................... 10—1

Dimensions & Weight...................................................................................10—2

Warranty & Repair............................................................................................ 10—3

Warranty....................................................................................................... 10—3

Repair........................................................................................................... 10—3

When to ship the unit................................................................................. 10—3

Description of the problem ........................................................................10—3

Shipping Instructions....................................................................................10—3

Chapter 11 Applications for the ENVI PRO......................................................11—1

Magnetic Surveying Overview.......................................................................... 11—1

Introduction ......................................................................................................11—1

Basic magnetic theory......................................................................................11—1

What is being measured? ............................................................................11—1

Anomalies ....................................................................................................11—3

Shape........................................................................................................11—4

Amplitude ..................................................................................................11—6

Variations in the Earth’s magnetic field ............................................................ 11—7

Diurnal variation ........................................................................................11—7

Micro-pulsations ........................................................................................ 11—8

Magnetic storms ........................................................................................ 11—8

Removing magnetic variations .................................................................. 11—9

Magnetic targets............................................................................................. 11—10

Induced and Remanent magnetism ........................................................... 11—10

Survey Planning ............................................................................................. 11—12

Introduction ................................................................................................11—12

Sampling intervals......................................................................................11—12

Line and Station spacing vs. Anomaly width ........................................... 11—12

Precision and Accuracy of Surveys............................................................ 11—13

Noise ....................................................................................................... 11—13

Tuning .....................................................................................................11—14

Survey mode ........................................................................................... 11—14

Field Observations .................................................................................. 11—16

Grid layout and orientation ......................................................................... 11—16

Survey procedures and a sample survey.......................................................11—17

Introduction ................................................................................................11—17

Survey do’s and don’ts...............................................................................11—17

Laying out the grid................................................................................... 11—17

Diurnal corrections vs. Survey pattern ....................................................11—19

Search mode...........................................................................................11—21

Note taking .............................................................................................. 11—21

Surveying in the WALKMAG mode .........................................................11—21

Surveying in the Stop-and-Go mode ....................................................... 11—23

Magnetic cleanliness ............................................................................... 11—23

Monitoring your data................................................................................11—24

Post-survey procedures .............................................................................11—24

Clean-up site if required .......................................................................... 11—24

Data correction ........................................................................................11—24

Data transfer............................................................................................11—24

Processing data.......................................................................................11—24

Field example.............................................................................................11—25

Columbia test site — Waterloo, Ontario .................................................. 11—25

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Bibliography .............................................................................................................1

INDEX ......................................................................................................................2

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Chapter 1 Preface

Congratulations on purchasing the ENVI PRO environmental magnetometer/gradiometer from Scintrex Limited. You are in possession of one of the most advanced magnetometers for environmental, geotechnical, archaeological and mineral exploration uses of today.

The ENVI PRO is a portable, proton-precession magnetometer that also is inexpensive, lightweight and rugged. In its trademarked WALKMAG mode it is ideal for applications where high productions, 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 PRO 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 the WALKGRAD mode for rapid

data acquisition

• Single-frequency GPS antenna allowing the user to acquire non-differential positional data along with the magnetometer data

• Large internal memory, expandable to 188,000 readings

• Easy to read, large LCD screen that displays data both graphically and

numerically

• Easy review of the data and Datacheck quality control

The complete ENVI PRO consists of several basic modules:

• Lightweight console with a large screen alphanumeric display and high

capacity memory

• GPS receiver antenna

• Staff or back-pack mounted sensor and sensor cable

• Rechargeable lead-acid battery and battery charger

• RS-232 cable for downloading data

Upgrades and Options

There are optional upgrade kits available for the ENVI PRO to provide the following:

1. True simultaneous gradiometer – An additional processor module is installed in the console, a second sensor with a staff extender and a ruggedized backpack for the WALKGRAD mode are provided in this kit.

2. Base-station applications – An accessory kit allows the sensor and staff to be converted into a base-station sensor and the cabling allows a field ENVI PRO or ENVI MAG to be connected for automatic magnetic operations down to minus 40°C.

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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. External trigger interface – This kit provides a tool for acquiring evenly spaced data when no survey grid has been established in advance. The kit is an interface between the ENVI PRO and a triggering device (such as a measuring wheel or a hip-chain that you supply). It works by triggering a station increment at intervals in the WALKMAG mode. Detailed instructions for installation, interfacing and usage are provided with the kit.

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Chapter 2 Introduction

This section is the reference for the ENVI PRO instrument itself. You will find all the information you need to know about setting up the unit for field use, its operation, maintenance and trouble-shooting. It is divided into eleven chapters with the information flow from chapter to chapter following a natural progression, as shown in the following table:

Chapter Description

1. Preface Features, upgrades and options.

2. Introduction Outlines what the instrument can do.

3. Preparing Describes the assembly of the system for use.

4. The Instrument

5. Operating Displays

6. Setting Up

7. Operating

8. Date Output

9. Maintenance

10. Reference

11. Applications Magnetic Surveying Overview and basic magnetic theory

This chapter is about the instrument itself.

Describes the various display screens.

Describes how to initialize the ENVI PRO and program it for different modes of operation. Guides you through typical instrument operation using basic, search and advanced configurations in a WALKMAG and a Stopand-go type of survey. Shows examples of data output formats and explains how to dump the acquired data.

Describes basic maintenance, trouble-shooting and repair.

Contains the technical specifications, instrument parts list and warranty information.

Cold Boot

Please read the section “First time operation” on page 6—1 so that you will know how to do a cold boot of the instrument. This is needed the first time you use it,

whenever you wish to change operating configurations or after the batteries have been removed for more than 10 minutes.

Instrument Overview

The SCINTREX ENVI PRO is an easy-to-use, lightweight, battery-powered, portable magnetometer. The magnetometer is a total field instrument using the proton-precession technique to measure the local magnetic field. Optional magnetometer upgrade kits allow the instrument to be used as a gradiometer or as a base-station. The standard configuration has the sensor mounted in a backpack

mode permitting rapid data acquisition in the trademarked WALKMAG mode.

Measured data is stored in the ENVI PRO console memory along with the coordinates where the measurement took place. You can

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Introduction

also enter descriptive notes of up to 32 characters at any station. The data can be displayed either numerically or graphically for quick inspection of the data quality and spotting of anomalies. Data can also be recalled from memory for visual inspection, dumped either to the serial port (RS-232) of a computer or directly to a printer. You can also automatically correct your magnetic data for diurnal variations when another ENVI PRO is used as a base-station or when you conduct your survey in the TIE mode.

The operating modes of the ENVI PRO can be manual, semi-automatic or fully

automatic. In the WALKMAG (walking magnetometer) mode, data are acquired and

recorded at rates of up to two readings per second, as you walk at a steady pace

along the survey line. At desired intervals, you trigger a station marker by pressing a

single button and the co-ordinates are automatically assigned to the recorded data. You can even introduce delays in the automatic recording to compensate for walking over rugged terrain.

The ENVI PRO comes with a Single-frequency GPS antenna allowing the user to acquire non-differential positional data along with the magnetometer data. Being a non-differential receiver, the positional accuracy is of the order of a few meters, which is sufficiently accurate for most magnetometer surveys. Should you require more accurate position and sensitivity, you should consider our NAVMAG cesium vapor magnetometer.

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Chapter 3 Preparing the ENVI PRO

This chapter describes:

How the ENVI PRO is packaged, how to connect the components to get an

operational unit, the various options you may have for powering the unit

The following photographs show the basic components (less packing materials) of the standard ENVI PRO.

3—1

The basic ENVI PRO kit

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Unpacking

The standard ENVI PRO is shipped in a carrying/shipping case The ENVI PRO with its accessories is packaged in cut-out sections in the case. 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:

Repacking

Warning: The batteries must be removed from the ENVI PRO

console prior to shipping or storage. Failure to do so may result in damage.

Assembly

In order to make the system as compact as possible for shipment and storage, and considering the various sensor configurations available, the ENVI PRO requires you to connect up the external components. This section will describe the steps required to completely assemble your

instrument.

Connecting the magnetic sensor(s) to the cable

The following illustrations show the proper cable connections for each of the different magnetic sensor configurations. The sensors are shown being

viewed from their bottoms looking at the screw terminals.

Important: All parts near the sensor are non-magnetic. It is highly

recommended that you use only the brass screws and

wire connectors supplied by Scintrex. There are additional screws for the terminals and cable hold-down in the minor spare parts kit (Scintrex p/n 788030). If you ever need to replace any of these parts under field conditions please ensure that they are made of non magnetic materials.

Total-field senso r

1. Orient the sensor so that as you look at the bottom of the sensor (the end with the terminals), the large square plug is at the 9 o’clock position.

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2. Use either Scintrex cable number 780547 (the shorter one) for the backpack configurations or cable number 780550 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 the cable to the terminal at the 11 o’clock position.

5. Connect the red spade-lug on the white wire of the cable to the terminal at the 11 o’clock position.

6. Place the cable in the smaller slot just below the 3 o’clock position.

7. Re-attach the cable hold down plate.

Total Field Sensor Cabling

Base-station sensor

1. Orient the sensor so that as you look at the bottom of the sensor (the end with the terminals), the large square plug is at the 9 o’clock position.

2. Use Scintrex cable number 780546.

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 plate.

Base-Station Sensor Cabling

Gradiometer Sensors - Lower Sensor

1. Orient both the sensors so that as you look at the bottom of the sensors (the end with the terminals), the large square plug is at the 9 o’clock position.

2. Use Scintrex cable number 788028 - it has four conductors.

3. Select the lower sensor - it has pairs of terminals at the 12 o’clock and 6 o’clock positions, as well as an attached cable to the terminals at the 6 o’clock position. See Gradiometer sensor cabling on page 3—4.

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Preparing

4. Remove the cable hold-down plate by unscrewing the screws at the 2 o’clock and 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 cable to the terminal at the 7 o’clock position. Please ensure that the already attached white wire of the smaller two-conductor cable remains attached.

9. Place the smaller two-conductor cable into the smaller slot just below the 3 o’clock position.

10. Place the larger four-conductor cable into the larger slot just above the 3 o’clock position.

11. Re-attach the cable hold-down plate. Gradiometer Sensors - Upper Sensor

12. Select the upper sensor - it only has a pair of terminals at the 12 o’clock position. See Gradiometer sensor cabling on page 3—4.

13. Attach the upper sensor to the lower one by placing the shaft of the lower sensor into the socket of the upper one while rotating slightly counter-clockwise. When they are fully engaged, firmly twist them clockwise against 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’clock position.

16. Connect the black wire of the two-conductor cable coming from the lower sensor to the terminal at the 11 o’clock position.

17. Re-attach the cable hold down plate.

Gradiometer sensor cabling

Installing the terminal protective cover

A plastic cup-like assembly is included to slide over the base of the sensor(s) to

protect the terminal connections from the elements.

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Preparing

To install the cover:

1. Slide it over the sensor shaft with the widest end pointing towards the sensor.

2. Slide the supplied O-ring into the grove on the shaft to lock it into place. To remove the cover, just reverse the above procedure. First remove the O-ring and slide the cup away from the sensor.

Assembling the sensor / GPS staff

Note: You can disregard this section if you are going to be using the

ENVI PRO in the backpack mode.

The sensor staff is shipped in four sections. These sections are located in the shipping case slot labeled Sensor and Staff. 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 rotate counter-clockwise while gently pushing the two parts together.

2. When they are fully engaged firmly twist them clockwise against each other.

Staff Mounted Installation

A staff mounted configuration is the most convenient when carrying out a magnetometer survey in the stop-and-go mode.

The following steps are required to properly assemble the ENVI PRO sensor and GPS antenna in the staff mounted configuration.

1. Assemble the staff sections as illustrated.

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Preparing

2. Insert the GPS antenna mount as illustrated.

3. Insert another staff section in order to clamp the GPS antenna mount between two staff sections as illustrated.

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Preparing

4. Insert the magnetometer sensor on the top section as illustrated.

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Preparing

Back-pack Installation

A back-pack mounted configuration is the most convenient; providing a hands-free operation for the ENVI PRO.

The following steps are required to properly assemble the ENVI PRO sensor and GPS antenna in the back-pack configuration.

1. Insert a staff section in the staff mounting insert located on the back-pack as illustrated.

2. If you are using the GPS antenna, insert the GPS antenna mount on top of the previous staff section, as illustrated.

3. Insert a second staff section, as illustrated. The GPS antenna mount will thus be lodged between two staff sections.

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Preparing

4. Insert the magnetometer sensor at the top of the second staff section, as illustrated.

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Preparing

Complete Assembly

Warning: You need to consider your travel direction wile surveying when you attach the sensor. The magnetometer’s performance is a function of the sensor’s orientation with respect to the earth’s magnetic field. Therefore you must ensure that the N mark on the sensor faces either magnetic north (or south – either is allowed due to symmetry). Please see Orientation on page 7-1.

Battery Installation/Exchange

The ENVI PRO is shipped without the battery installed. This is the proper procedure, while shipping and storing the instrument, to prevent deep discharge of the battery.

Deep discharge can possibly cause permanent damage to the battery and will always shorten the battery life. This situation will occur because a small current is being

drawn even if the instrument is turned off.

The following steps outline the battery installation:

1. Turn the instrument face down on a clean and even surface.

2. Unscrew both knurled screws on either side of the battery cover and lift the cover

off.

3. Place the battery into the recess in the rear panel of the instrument.

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Preparing

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 carry an additional battery along as a spare.

Warning: An internal battery keeps the memory and the internal

clock alive for about 10 minutes. It is strongly advised

that the switching to the spare battery be done quickly,

to prevent the loss of your data.

Note: You need not worry about a low battery causing data loss,

since the memory power requirements are much less than those needed to make a valid reading of the magnetic field.

ENVI PRO battery pack

Using the external battery pack

Cold weather use and extended WALKMAG surveys may require more power than the standard battery together with a spare can provide. To satisfy this additional

requirement, the External Heavy Duty Battery Pack (Scintrex p/n 788026) is available. It provides about three times as much power as the standard battery. This

battery pack can be carried by the strap or attached to a belt.

To connect the external battery you must proceed as follows:

1. Turn the instrument face down on a clean and even surface.

2. 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 ENVI PRO 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. Place the new cover on to the console by gently pushing it into place and tighten

the knurled screws on the both sides.

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Preparing

7. Please check the battery voltage condition at this stage and charge the battery, if required.

External Heavy Duty Battery Connection

Using an external power supply

More demanding applications, such as an extended base-station operation, may require more power than can be provided with either of the Scintrex supplied battery

packs. In this case you have two options:

a) AC Power

If a source of AC power is available, the instrument can be run while the charger is connected to it. You will also be charging the standard internal battery, if it is installed, at the same time.

Note: Please be aware of possible magnetic noise from generators,

and ensure that all cabling and sensors are as far away as possible from the generator.

b) 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 788029) 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 Connector at the

right-rear side of the ENVI PRO console. See item 6 in the figure on page 4—2.

3. Connect the end with the clips to the battery terminals. The red cable-clip goes to the positive battery terminal. The black cable-clip goes to the negative battery

terminal.

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Preparing

Important: The correct polarity must be used for the instrument to

operate properly.

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Chapter 4 The Instrument

This chapter is about the instrument itself and fully describes:

• The ENVI PRO console

• The keypad functions

• The various display menus

• The display formats that you will encounter

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Console

Console Description

# Item Description

1 Keypad The fully sealed Keypad has 19 keys and a sound port.

Liquid Crystal

Display (LCD)

Carrying Strap

Attachment

4 Sensor Connector

Data Output

5. Connector

Charger/External

Power Connector

The large 8 line by 40 character (64 x 240 dots) Supertwist LCD (with a wide temperature range) presents status and data in a numeric or graphic format.

Four rings at the side of the console that allow attachment of the carrying harness.

Up to two sensor connectors may be present at the left

hand side of the console. The nearer one J102, 10 Pin connector, is reserved for the magnetometer sensor. The J101, 8 Pin connector is reserved for the GPS antenna.

The data output connector carries RS-232 data dump signals, as well as the analog signal for a strip chart recorder and is located at the right hand side of the console.

It has the following pin assignments:

A – common (ground) B – RS-232 receive data

C – RS-232 transmit data C – analog out 0-1 Volt

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

Battery

Compartment

9 Desiccant Cartridge

10 Battery

11 Fuse The standard 1.5A fuse to use with the standard battery.

The charging light (visible through a window on the left side) indicates that the battery is charging at a high rate.

The battery compartment is located at the back of the console and contains one rechargeable lead-acid battery, the desiccant cartridge and the fuse. The battery cover is replaced with another cover with a cable attached when the external battery is used.

The desiccant cartridge is a cylindrical re-usable capsule filled with a drying agent. It absorbs any moisture that my get inside the instrument.

A rechargeable lead-acid battery in the standard ENVI – MAG configuration.

Keypad Description

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Console

The keypad has 19 keys. Two of the most used keys are duplicated on the 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 multifunctional keys depends upon the operation in progress.

Note: The function mode of the keys has precedence over the alpha-

numeric mode of the keys.

Key Functions

Key Description

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The ENVI PRO keypad

Turns the instrument on and off. Turning the instrument off during a reading abruptly terminates a reading with the loss of the current data.

Starts or stops an operation, such as data acquisition, data dumping, data recall, etc.

*When the instrument is in the Notes operation, this button acts as a “backspace” key to delete entries.

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Console

*Accesses the various setup displays. The actual setup menu that will be displayed depends upon the display screen in which this key is pressed.

*Accesses the Auxiliary Functions display allowing:

- setting of the LCD intensity

- data output

- locking of the setup parameters

Moves the cursor to the left or up; to the right or down.

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 the walking type survey. Allows escape from a deeper level in a program to a higher

level, ultimately to the top level, which is signified by the Main operating display.

Aborts a data dump. *Accesses the Info. Display, which allows:

- setting of data and time

- enabling and selecting GPS coordinates

- entering of serial and job numbers, and operator identification

- observation of memory availability. 2 identical keys:

- scrolls sequentially through numeric data display pages

- scrolls sequentially through graphic data display pages

- moves the cursor from one sub-page to the next sub-page

- moves the cursor to the next character location during note entry

- advances the station number by station separation in the walking mode. *Accesses the Note Entry display, which allows:

- the entry of five common notes (macros) to be recorded repeatedly with selected readings

- the entry of unique notes to be recorded with a particular reading.

4—4

Toggles the data display between numerical and graphic data presentation during data acquisition only.

*Presents the Recall display for selection of:

- data item to be recalled

- setting of the starting location or time of the recall.

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Console

*Manually records measured data and notes in internal memory.

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 through a list of items:

- allows sign entry to numbers

- allows panning along a line of data during recall

- increments or decrements the line and station number in the Stop-and-Go mode.

*Allows alpha-numeric entry for setups and notes.

This blank “key” in the upper left corner of the console is not actually a key, but a flexible membrane to enhance the

* These items/key functions are only operational when you select the advanced

operating modes (options 5 to 7) from the initial configuration menu.

loudness of the beeper.

Pressing the “ON” and “AUX/LCD” keys simultaneously performs the COLD BOOT operation, resetting the instrument to factory defaults.

Display Screens

The ENVI PRO currently has the following types of displays:

• Help screens

• Confirmation screens

• Parameter selections screens

• Note entry screens

• Numeric data displays

• Graphical data displays

• Pop-up options and confirmations

General Information

Most of the screens consist of three bands of information as shown below:

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Console

General display information bands

The Title Line at the top indicates the current operating functions. The middle six lines contain specific display information consisting of either instrument and survey parameters or data.

1. The bottom line usually contains prompts for actions, such as pressing the key required to start an operation. Miscellaneous messages may also appear here. The battery voltage (values between 100 and 140) is also shown on the right-side of this line.

Note: The instrument automatically turns off (blank display) to

conserve battery power, if there is no reading or key stroke detected for 30 minutes.

Cursor

A large, blinking cursor indicates the specific parameter that

can be altered to change setups, starting station value, station or line spacing, and so on. The cursor is moved from parameter to parameter or line to line by pressing the arrow keys to move in the desired direction. The prompt on the bottom line will let you know 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.

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Console

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 screen).

Switching between pages is also done by pressing the “NEXT” key. The display screens are designed so that these multi-page displays do not have separate subblocks. All of this is discussed in detail under “Advanced mode data displays” on page 5—8.

Pop-Up Windows

Some displays will have pop-up windows (either on the right or left side of the main display) that will contain:

• Prompts for selecting or changing parameters

• Confirmations and warnings 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

• Synchronization of the Real Time Clock of the ENVI PRO console with the

GPS time signal

Sample pop-up windows

Help Screens

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Console

On line help is also available. There are three screens of information providing a quick reference on how to do most operations and which buttons to push. The screens are as follows:

4—8

Help screens available

The help screens are displayed when you press the “INFO” button. Whenever you see the text “help: INFO” in the bottom prompt line of a display, you can activate the help screens.

To toggle to another help screen, press the “+” or “–“ key. The screens change in a cyclical manner.

To return to the MAIN OPERATING menu, press the “ESC” key.

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Chapter 5 Operating Displays

The various display screens with and without GPS will be discussed in this chapter.

Main Operating display

MAIN OPERATING display with and without GPS appears as follows:

Main operating display without GPS

Main operating display with GPS in Lat/Lon coordinate

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Main operating display with GPS in UTM coordinate

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Operating Displays

The configurable parameters of the MAIN OPERATING display are:

Parameter Description

MAG

SEP

DIVBY

LON

LAT

EASTING

mmm shows which type of magnetometer measurement is currently enabled, and therefore ready to be started. 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 the entry of the geographical direction or the Cartesian co-ordinates. The allowed entries are N,E,S,W, + or -. The line or station separation.

The range is from 0 to 99999 with a decimal point, as required, and can either be positive (+) 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.

Trigger switch closure counter.

The line number, along which the measurements take place.

It consists of the numeric part (1111.1) and the directional part (d).

The range is from 0 to 99999 with a decimal point as required.

The direction allows you to enter the geographical direction or the Cartesian co-ordinates as one of: N,E,S,W, + or -. The GPS longitude of this measurement in lat_lon coordinate.

It consists of the positive numeric part (ll.llllll) and the directional part (W or E).

The GPS latitude of this measurement in lat_lon coordinate.

It consists of the positive numeric part (ll.llllll) and the directional part (N or S).

The GPS easting of this measurement in UTM coordinate.

It consists of the positive numeric part (eeeeeee.e).

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The GPS easting of this measurement in UTM coordinate.

NORTHING

It consists of the positive numeric part (nnnnnnn.n).

Instrument setup display

This display enables you to configure the basic data acquisition portion of the ENVI PRO and is accessible with the “SETUP” key.

ENVI PRO instrument setup display

Parameter Description Default

Displays the magnetometer specific

MAG SETUP

AUTO ST. INC.

CYCLE REPEAT

setup menu.

Pressing the “ENTER” key gets the next menu. A “yes/no” toggle that controls the automatic station increment (decrement).

no - for the base station, walking or manual type of operation.

yes – for semi-automatic operation. Determines whether the magnetometer will take one reading only, or will continuously take readings at the time interval specified by the DURATION parameter I the Mag. Setup.

This is not applicable for Base Station operation, which is set in the Mag Setup.

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The delay between readings when the cycle repeat feature is enabled.

CYCLE DELAY

ERASE MEMORY

HEATER

It affects the total-field magnetometer or gradiometer only.

The base-station repetition rate is controlled in the Mag. Setup under Cycle Time. Allows clearing of the data memory.

A request for confirmation will be displayed before the actual erasure takes place.

NOTE: The setup parameters remain intact. Enables or disables the LCD display heater.

If the temperature is above – 15° C, enabling this parameter has no effect.

Magnetometer setup display

This display is different depending on if GPS is enabled or not.

This display provides access to the parameters affecting the operation of the magnetometer portion of the ENVI.

This display is accessible from either the Instrument setup display, or

from the Main operating display (by using the short-cut, i.e. pressing

the “ENTER” key).

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Magnetometer setup display with GPS disabled

Magnetometer setup display with GPS enabled

Parameter Description Default

Allows the selection of:

- Total Field Magnetometer

MODE:

DURATION

(default)

- Gradiometer

- Base Station

- Off (will disable the ENVI PRO)

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 spacing of the stations when using the WALKMAG mode of operation.

The duration also controls the repetition rate if CYCLE REPEAT with a CYCLE DELAY of 0 (zero) was chosen in the ENVI instrument setup.

The longest duration results in the highest precision.

Tfld

0.5

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The value of the Earth’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.

TUNE FIELD

BASE CORRECT

TIE CORRECT

CYCLE TIME

A map showing the approximate field intensity on the Earth’s surface can be found in Section B: Applications. The values shown can be used as a starting point, and applied equally to the Total-field sensor or the Gradiometer sensor.

See also AUTO TUNE. A “yes/no” toggle that applies a BASE-STATION correction using data supplied from a base-station ENVI PRO.

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”.

A request for confirmation will be displayed 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: The original raw data is changed. A “yes/no” toggle that applies a tiepoint correction using data collected in the TIE mode.

Selecting this opens a window indicating which tie-point (loop or line) correction mode is in effect. You must enter “Y” to start the correction.

NOTE: The original raw data is changed. The reading interval of the base station.

The allowable range is 0 to 99999 seconds.

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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. The sensitivity for the analog output

CHART SCALE

AUTO TUNE

BASEFIELD

for the strip chart recorder.

The following choices are available: 1, 10, 100, 1000, 10000 nT. 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 distances.

Fixed tuning may be more appropriate in areas of large cultural electrical noise or very narrow, large amplitude anomalies. These may pull the tuning away from the desired frequency to that of the interfering frequency or to tuning field values greatly different from the background.

As the setting of this 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 applicable to use fixed tuning for the

site characterization and drum location modes.

The base field is used in conjunction

with the base-station correction

procedure.

The base-station correction technique removes variation in the ambient field during the time that the base station is running. However, variations taking place from day to day are not corrected. The base field

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value is used for this purpose.

The actual value is not critical, as long as it is the same for all instruments in the survey. It is important that this value not be changed during the entire survey. A logical value is the first reading of the base-station on the first survey day. Allows you to select either the Line or Loop type of tie-line correction.

TIE MODE

AUTO RECORD

NOTE: The Tie-line correction

method is substantially less precise

than the base-station correction method. A “yes/no” toggle.

This function is used in the semiautomatic 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 PRO Instrument Setup.

Line

Data Displays

Data is displayed on a page by page basis in either numeric or graphic form. There are up to two pages each. The “NUM/GRA” key toggles between the two display forms. This display is different depending on if GPS is enabled or not.

Numeric data display

Numeric displays are only available when the instrument is recording data, i.e. you cannot “recall” the data in a tabular format as shown in the figure below.

The displays shown in the examples that follow are Pages 1 and 2 of the numeric

data display for the gradiometer. The difference between the two display pages is that Page 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.

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The following table shows the availability of a numeric display after pressing the “NEXT” key.

* You will have to use the “RECALL” function, if you have pushed the “ESCAPE” key.

Page 1 of the numeric data display with GPS disabled

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Page 2 of the numeric data display with GPS disabled – signal strength

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Page 1 of the numeric data display with GPS enabled

in lat_lon coordinate

Page 2 of the numeric data display with GPS enabled

in lat_lon coordinate – signal strength

Page 1 of the numeric data display with GPS enabled

in UTM coordinate

Page 2 of the numeric data display with GPS enabled

in UTM coordinate – signal strength

Display Item Description

The magnitude measured by the lower total-field sensor in nanoTeslas (nT).

TOTAL

5—10

The most current reading is the top most followed by preceding

readings.

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NOISE

GRADIENT

TIME

LON

LAT

EASTING

NORTHING

A number indicating the quality of the reading.

It is based on the noisiness of the individual periods of the

precession signal. The smaller the value the better the quality of

the reading. The magnetic gradient between the two sensors.

Expressed in nT/m. The current time in hours: minutes:seconds.

It is used to time stamp each reading. The line number on which this measurement took place.

The value consists of the numeric and directional parts. The station number to which the respective magnetic data applies.

The value consists of the numeric and directional parts. GPS longitude in lat-lon coordinate on which this measurement took place.

The value consists of the numeric and directional parts GPS latitude in lat-lon coordinate on which this measurement took place.

The value consists of the numeric and directional parts. GPS easting in UTM coordinate on which this measurement took place.

The value consists of the numeric only. GPS northing in UTM coordinate on which this measurement took place.

The value consists of the numeric only.

Graphic data display

The display shown below is page two of the graphic data for the gradiometer. Page one appears identical, except that the word ‘GRADIENT” is changed to “TOTAL” and a plot of the total field is shown. This display is different depending on if the GPS is enabled or not.

The following table shows the availability of graphic displays after pressing the “NEXT” keys.

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* You will have to use the “RECALL” function, if you have pushed the “ESCAPE” key. ** Depends upon the status before “STOP” was pressed.

Graphic data display of Page 2 – without GPS

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Graphic data display of Page 2 – GPS Lat/Lon

Graphic data display of Page 2 – GPS UTM

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Operating Displays

Display Item Description

The display title indicating the data shown by the graph.

GRADIENT

LON

LAT

EASTING

NORTHING

The numeric value indicated by ggg.g is the respective gradient, at the indicated Line and Station number The line number along which this measurement took place, consisting of the numeric and directional parts. The station number, at the cursor position, to which the respective magnetic data applies (consisting of the numeric and directional parts). GPS longitude in lat-lon coordinate on which this measurement took place.

The value consists of the numeric and directional parts GPS latitude in lat-lon coordinate on which this measurement took place.

The value consists of the numeric and directional parts. GPS easting in UTM coordinate on which this measurement took place.

The value consists of the numeric only. GPS northing in UTM coordinate on which this measurement took place.

The value consists of the numeric only.

Recall Displays

The “RECALL” function is useful to view the collected and stored data. But the RECALL function is disabled when GPS enabled.

Recall Setup display

This display allows you to select the type, location or time and date of the data when GPS is disabled. This display is accessed by pressing the “RECALL” key.

The RECALL SETUP display with GPS disabled

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Operating Displays

The RECALL SETUP display with GPS enabled

Display Item Description

MAG

Warning: GPS must be disabled in order to recall t-fld and grad. data.

The station number is the starting location for the recall, consisting

This parameter is only present when the Base Station is selected.

Either one of Total Field, Gradient or Base Station.

The line number whose data is to be recalled, consisting of the

Not only the Time and Date, but the Line and Station numbers must also be correct to successfully recall Base Station data.

The mode of the data collected.

numeric and directional parts.

of the numeric and directional parts.

The starting time of the recall.

The data of the data to be recalled.

RECALL DATA display

Note: Only Data collected and saved with GPS disabled can

5—14

be recalled, but only in graphic form and with GPS

disabled. Up to 178 readings can be shown at one time. The display window can be moved sideways

(called panning) in steps of one half of its width (i.e. up

to 89 readings) to view adjacent data with the aid of the

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“+” or “-“keys. It is also possible to adjust the vertical 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 accessible with the “START” key when in the RECALL SETUP display.

The RECALL DATA display

Display Item Description

The title of the display indicating the data shown by the graph.

TOTAL

The numeric value indicated by MMMMM.M is the respective totalfield value, at the indicated line and station number. The line number along which this measurement took place, consisting of the numeric and directional parts. The station number to which the respective magnetic data applies,

consisting of the numeric and directional parts, at the cursor

position.

Modifying the display window

The graph can be altered by changing the vertical scale or by centering any point vertically in the window. A smaller window can be opened up using the “ENTER” key to allow changes. The changes take effect after you press “ENTER”.

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Operating Displays

The RECALL Display ready for customizing

Display Item Description

Shown after the “ENTER” key is pressed.

SCL

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 ← and → cursor keys.

Numerical data at the left hand side of the display represents the data at the cursor position.

Pressing the “0” key adjusts the display such that the point at the cursor position becomes the center value of the graph.

Auxiliary Functions display

The Auxiliary Functions display is accessible by pressing the “AUX/LCD” key. It provides additional functions which are not directly accessible from the keyboard. You will need to press the appropriate key to get to the function.

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The auxiliary functions display

Key Pressed

These keys allow you to adjust the intensity of the LCD screen for better viewing under a variety of lighting conditions.

This option allows you to access the Data Output menu to transfer information to you computer or printer.

This function is reserved for production and service tests. It has no functions for you to use.

The lock option allows you to lock the ENVI PRO setup parameters so that they are not accidentally changed. To make any changes, you will have to toggle this option first.

Action under

Auxiliary functions

Data Output Display

This display allows the selection of:

• Communication parameters between the ENVI console and the output device such as a computer or printer.

• The data format of the output

• And possibly the Line number, if a line by line data dump is desired.

Data can be dumped in its entirety at once, or selectively on a mode basis.

This display is accessible from the AUXILIARY FUNCTIONS display. Depending on if GPS is enabled or not, the display is different.

The data output display with GPS disabled

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The data output display with GPS enabled

Parameter Description Default

With the cursor placed after the : all data recorded

MAG

BY LN

BAUD

colon, all the data in the instrument

would be dumped sequentially into

one, possibly very large, file.

Lists the modes available for the

ENV-MAG. As shown, only the

gradiometer data would be dumped

as indicated by the cursor position.

yes/no

Directs the instrument to dump the

data on a line by line basis, in

addition to a method by method

basis.

This is usually left at no.

The line number whose data has to

be dumped, consisting of the numeric

and directional parts.

The Baud rate of communication with

the output device.

The following choices are available

by scrolling: 600, 1200, 2400, 4800,

9600, 19200, 38400, 57600 Baud.

A delay which may be added after

each carriage return/linefeed (CR/LF)

to accommodate slow peripherals

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.

9600

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The number of data bits.

The default value is 8 bits, which

usually works properly. BIT

FMT

The proper setting has to be

established experimentally. For

example, on some printers, 7 or 8 bits

results in either normal or italic print.

The output data format.

Data output formats

The following table shows the available output formats for dumping the data to a computer or printer.

Data output

format

XYZ

XYZ+

XYZ++

PRN

NOTES

XYZ is the simplest format.

It contains no heading or comments.

The individual data items are separated by a single space character.

X and Y represent the Cartesian 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 information, you should label the files clearly. XYZ+ is identical to XYZ but a header and user entered NOTES are added. XYZ++ is identical to XYZ+ but the data is now placed into columns. PRN is a format used with software for the Scintrex MP-3/4 Magnetometer. NOTES outputs a report of all user entered NOTES, crossreferenced with the Line and Station number, or GPS coordinate value.

Description

NOTES display

The notes display is useful for the entry of comments, which are stored with the data at the particular Line and Station number.

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Macros (pre-recorded messages) provide a quick entry for repetitive notes which can

be entered while measuring. This display is accessible with the “NOTE” key.

The NOTES display

Parameter Description

Alpha-numeric characters, including “+”, “.” and “-“ up to 32 characters.

NOTES

MACROS 1: … 5:

A note can be saved as one of five macros in a separate memory for re-use. MACROS are pre-recorded messages of up to 15 characters. These are used to speed up note entry.

It is most advantageous to enter frequently encountered items,

such as road, fence, and so on.

Information / GPS Setup Display

This display screen is used for the entry of ancillary information and GPS setup. You can also see how much free memory is available. This screen is accessed from the main display by pressing the “INFO”

key. Fig. 1 shows the default display or with GPS disabled. In order to enable or disable GPS, move the cursor to GPS and press “+” or “-“, a pop-up window comes out as shown in Fig. 2. By selecting 2 or 3 to enable GPS and configure it to either Lat/Lon or UTM coordinate. At this point, the real time clock (RTM) is synchronizing with GPS time, as shown in Fig. 3. Fig. 4 and 5 show the INFO screen with GPS lat/lon and UTM coordinate, respectively.

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Fig. 1 The default INFO display

Fig. 2 GPS setup display

Fig. 3 RTC synchronizing display

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Fig. 4 The INFO display with GPS enabled (LAT/LON)

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Fig. 5 The INFO display with GPS enable (UTM)

Parameter Description

Vx.x The version number of the ENVI PRO internal software. TIME The current time of day. DATE The present data.

GPS

GPS INTERVAL

SER.*

JOB *

OPERATOR This is the operator’s name or number. MEMF The percentage of free memory available for further use. HDOP This is the qualities of GPS reading. SAT. This is the number of satellites. LON. This is the GPS longitude value. LAT. This is the GPS latitude value. EAST. This is the GPS UTM easting value. NORT. This is the GPS UTM northing value.

Enable or disable of GPS. Configure GPS to LAT/LON coordinate or UTM coordinate.

This is the GPS reading intervals when taking measurement.

This is usually the serial number of the instrument.

No use is made of this number by the instrument, therefore it also could represent the users inventory number.

Up to 8 digits are accepted. This may be the survey project number.

Up to 6 digits are accepted.

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.

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Chapter 6 Setting Up the ENVI MAG

This chapter describes the process of how to:

• Initialize the ENVI PRO for first time operation

• Program it for the different modes of operation

• Enter line and station numbers

Step by step procedures are given in Chapter 7 on how to perform:

• A total-field survey in the WALKMAG mode

• A gradiometer survey in the stop-and-go mode

• Base-station operation

First Time Operation

A special procedure has to be followed to get the ENVI-PRO 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.

Warning: First time operation procedures (cold boot) have to be

carried out every time the instrument has had its battery disconnected for more than 10 minutes. You may also need to cold boot if the screen stays blank or is scrambled.

Cold Boot

To perform a cold boot, proceed as follows:

Press the “ON/OFF” key repeatedly and listen carefully to the beeper. Stop pressing this key after the display goes blank, or after the unit stops beeping. This is to ensure that the ENVI PRO is truly in the OFF state.

Press and hold the “AUX/LCD” key. Then press the “ON” key. Release both keys after the beep. The following message should appear:

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Setting Up

Press the “9/YZ” key containing “Y” for yes to

confirm the cold boot operation.

You are now ready to setup your ENVI PRO for surveying.

Configuration Menu

Main operating displays for all modes with GPS disabled

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Main operating displays for all modes with GPS Lat/Lon

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Main operating displays for all modes with GPS UTM

HOW TO:

Access the Main Operating Display

The Main Operating display can be called up by

simply pressing the “ON” key or by pressing the

“ESCAPE” key one or more times.

Access Display Sub-Panels/Blocks

Some display screens have sub-panels or blocks that are separated by a vertical and/or horizontal line. These represent different logical sub-groups of information. To move the cursor into another block you will have to press the “NEXT” key.

Access the Parameter Fields

To access a particular parameter 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 you to either:

Select from a list when the prompt is Chg?+-, by pressing either the “+” or ““ keys.

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Fill in the parameter fields via the keypad when the prompt is Chg?ENT, by first pressing the “ENTER” key. You will then need to follow the procedures as described for “Enter” in the next item.

Select and Enter

To simplify the detailed descriptions that will be presented next, the key-words Select and Enter will be used to represent a series of actions that you will be required to do.

These are defined as follows:

Select

When the prompt Chg?:+- appears in the bottom left corner of the display, you have

a pre-defined list of values to choose from. You will be required to make a selection

as follows:

Press either the “+” or “-“ key to scroll through two or more parameters.

Enter

When the prompt Chg?:ENT. Appears in the bottom left corner, the parameter field requires you to enter a specific value. The enter values, you will be required to do the following:

Step Press Action

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This opens the field for data entry as indicated by a new prompt (>) at the start of the field.

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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 same key several times to get the proper character to appear (similar to spelling on a telephone keypad).

If you enter an incorrect value, use the “CLEAR” key to delete the incorrect character(s).

Pressing the “ENTER” key again stores the value in memory and the prompt (>) disappears.

Line and Station Setup

Except for the Search mode magnetometer configuration, you will need to enter into the ENVI PRO the information about your survey grid. This includes:

• Your starting points on each line

• How far apart each line is

• How far apart each station on the survey line is

Note: In considering the co-ordinate system shorthand you will be

using for a survey grid, you should be aware that the units of measure are not important, as no calculations are made by the console with respect to distance. Consequently, you can use single digits to represent values that may actually be in hundreds.

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 on the grid survey pickets as 16+00E) with a Line separation (SEP) of 2

• Set the Station Number (ST) to 50 North (sometimes marked on the grid

survey pickets as 50+00N), with a Station separation (SEP) of minus 10. The minus indicates that the walking direction is to the south.

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Press the “NEXT” key to move the cursor to the right hand block/subpage of the display. If the cursor is already in the locations block, go on to the next step.

Entering the Starting Station

Move the cursor to ST:

Enter 50

Move the cursor one step forward

Enter n (for north)

Move the cursor to SEP:

Enter -10

Note: The “-“ causes the station number to

decrement. This indicates that you will be

traveling south and that stations are spaced 10 units apart.

Entering the Starting Line

Move the cursor to LN:

Enter 16

Move the cursor one step forward.

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Enter e (for east)

Move the cursor to SEP:

To set your required starting point and separations, just substitute your specific

values in the previous steps. Also, keep in mind that entering negative values for the separation parameters causes the respective line or station values to decrement.

Enter 2 (This indicates that you will be surveying successive lines 2 units apart and you will be moving in a easterly direction)

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 repeat feature of the measurement. A cycle delay can also be entered, so that the repetition rate is adjusted while walking uphill or downhill.

From the MAIN OPERATING display proceed as follows:

Press the “SETUP” key. The INSTRUMENT SETUP display appears:

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Move the cursor to AUTO ST. INC: (automatic station increment).

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Select No (Since the ENVI PRO is reading continuously, you want the station value to change only when you reach a station – not with every reading.

Move the cursor to CYCLE REPEAT:

Select Yes (You want the instrument to continuously take readings at the rate specified by the DURATION parameter)

Move the cursor to CYCLE DELAY:

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. You should enter what ever is appropriate for the type of terrain you are traversing).

Ignore ERASE MEMORY:

Move the cursor to HEATER:

Select No (Unless you are doing a winter survey and the ambient temperature is below -15° C)

Press ‘ESCAPE” to return to the MAIN OPERATING display.

Sample Total-Field Setup (Walkmag or Walkgrad)

The following steps prepare the ENVI PRO for:

• A total-field survey in the WALKMAG or WALKGRAD modes

• With a 0.5 second reading period (though 1 or 2 seconds can also be used)

• Automatic tuning

• Manual station increment

From the MAIN OPERATING display proceed as follows:

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Press the “SETUP” key and the INSTRUMENT SETUP display appears:

Carry out steps 2 through 9 for setting up the instrument on page 6—14, if you have not already done so.

Move the cursor to MAG SETUP.

Press “ENTER” and the MAG SETUP display appears:

Mag Setup Display with GPS Disabled

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Mag Setup Display with GPS Enabled

Move the cursor to MODE:

Select t-fld or grad from the following list:

Off ,t-fld,grad,base

Move the cursor to DURATION:

Select 0.5 sec from the following list:

0.5 sec, 1 sec, 2 sec

Move the cursor to TUNE FIELD:

Enter the ambient magnetic field value of your survey area.

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Ignore BASE CORRECT:

Ignore TIE CORRECT (GPS disabled):

Move the cursor to CYCLE TIME:

Enter 0 (This parameter is used in the base-station mode only and should be 0 for all other modes)

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Move the cursor to CHART SCALE:

Select 10 from the following list: 1, 10, 100, 1000, 10000 (This is the range in nT scale)

Move the cursor to AUTO TUNE:

Select yes (This assumes that you will encounter large variations in the ambient field, without strong gradients. If 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)

Move the cursor to BASE FIELD:

Enter the ambient magnetic field value, if known, of your survey area.

Move the cursor to AUTO RECORD:

Select no

Ignore TIE-MODE (GPS disabled):

Press “ESCAPE” to return to the MAIN OPERATING display.

Sample Stop-and-Go Gradiometer Setup

The following steps prepare the ENVI PRO for a:

• Gradient survey

• In the Stop-in-Go mode

• With a 2 second reading period

• And fixed tuning in the fully manual mode

From the MAIN OPERATING display proceed as follows:

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Press the “SETUP” key and the INSTRUMENT SETUP display appears:

Follow the instructions for the INSTRUMENT

Select no

Enter 0

SETUP on page 6—14, but substitute the following:

Move the cursor CYCLE REPEAT:

Move the cursor to CYCLE DELAY:

Move the cursor to MAG SETUP:

Press “ENTER”. The MAG SETUP display now appears.

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Move the cursor to MODE:

Select grad from the following list: off, t-fld, grad, base

Move the cursor to DURATION:

Select 2 sec from the following list: 0.5 sec, 1 sec, 2 sec

Move the cursor to TUNE FIELD:

Enter the ambient magnetic field value of the survey area.

Ignore BASE CORRECT:

Ignore TIE CORRECT (GPS disabled):

Select No (Please refer to “Remote operation” for more information on this feature)

Move the cursor to CYCLE TIME:

Enter 0

Move the cursor to CHART SCALE:

Select 10 from the following list: 1, 10, 100, 1000,

10000. (This is the range in nT full scale)

Move the cursor to AUTO TUNE:

Select no

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Move the cursor to BASE FIELD:

Enter the ambient magnetic field value of the survey area, if known.

Move the cursor to AUTO RECORD:

Select no

Ignore TIE-MODE:

Press “ESCAPE” to return to the MAIN OPERATING display.

Sample Base-Station Setup

The following steps prepare the ENVI PRO as a:

• Magnetic base-station

• With a 2 second reading period

• And fixed tuning

From the MAIN OPERATING display proceed as follows:

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Press the “SETUP” key and the INSTRUMENT SETUP display appears:

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Select no

Enter 0

Follow the instructions for the INSTRUMENT SETUP, but substitute the following:

Move the cursor CYCLE REPEAT:

Move the cursor to CYCLE DELAY:

Move the cursor to MAG SETUP:

Press “ENTER”. The MAG SETUP display now appears.

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Move the cursor to MODE:

Select base from the following list: off, t-fld, grad, base

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Move the cursor to DURATION:

Select 2 sec from the following list: 0.5 sec, 1 sec, 2 sec

Move the cursor to TUNE FIELD:

Enter the ambient magnetic field value of the survey area.

Ignore BASE CORRECT:

Ignore TIE CORRECT (GPS disabled):

Select no (please refer to “Remote operation” for more information on this feature)

Move the cursor to CYCLE TIME:

Enter 0

Move the cursor to CHART SCALE:

Select 10 from the following list: 1, 10, 100, 1000,

10000. (This is the range in nT full scale)

Move the cursor to AUTO TUNE:

Select no

Move the cursor to BASE FIELD:

Enter the ambient magnetic field value of the survey area, if known.

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Move the cursor to AUTO RECORD:

Select no

Ignore TIE-MODE (GPS disabled):

Press “ESCAPE” to return to the MAIN OPERATING display.

Information Display

The steps described below are used to set:

• The date

• Time

• Job number

• Serial number

• Operator identification

• GPS

From the MAIN OPERATING display proceed as follows:

Press the “INFO” key and the INFORMATION display appears:

NOTE: if GPS is used, TIME and DATE can not be entered manually. GPS is able to automatically setup the GMT time and date.

Move the cursor to TIME:

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Enter the current hour

Move the cursor one step →

Enter the current minute

Move the cursor one step →

Enter the current seconds or set to zero

Move the cursor to DATE:

Enter the current year

Move the cursor one step →

Enter the current month (numeric entry 1 to 12)

Move the cursor one step →

Enter current day (numeric entry 1 to 31)

Move the cursor to GPS:

Press “+” or “-“, then select “2” or “3” to select GPS coordinate.

At this point, GPS is enabled and time, data and GPS information show automatically

Move the cursor to GPS INTERVAL:

Enter GPS reading intervals

Move the cursor to SER.*:

Enter the instrument serial number or other

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permanent identification

Move the cursor to JOB *:

Enter a job number or other unique identifier for

the survey

Move the cursor to OPERATOR:

Note Entry

This section describes the steps needed to:

• Enter unique text to be recorded with the present measurement

• Or how to enter text to be used as macros for use as quick-entry notes

Identical keystrokes are also used to enter the operator’s name in the previous paragraph.

Notes, or macros, may contain all letters and number sas well as +, ., -. Entry procedures are similar to the Enter procedure for entering numbers only, as discussed in the previous sections. The Number keys now offer 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.

From the MAIN OPERATING display proceed as follows:

Press “NOTE” and the NOTE display appears:

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Press the “ENTER” key.

Press the “2” key repeatedly until f appears.

Press the “NEXT” key. If the following character is on a different key, there is no need to Press the “NEXT” key.

Press the “2” key again until e appears.

Continue entering in the same way until “fence” is completed.

Press the “NEXT” key twice.

Press the “1” key.

Press “ENTER”.

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 the final step is omitted. The note will then be recorded along with the data. The note entry field is then cleared.

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Display Intensity Control

The display intensity gets pre-set at each cold boot and seldom needs to be adjusted. If it does, proceed as follows:

From the MAIN OPERATING display:

Press the “AUX/LCD” key, and the AUXILIARY FUNCTION display appears.

Press the “+” or “-“ key to adjust the intensity of the display to your satisfaction.

Press “ESCAPE” twice to return to the MAIN OPERATING display.

Parameter Lock

The ENVI PRO instrument setup and mag setup parameters can be locked to prevent accidental change. To do so, proceed as follows:

From the MAIN OPERATING display:

Press the “AUX/LCD” key to get the AUXILIARY FUNCTIONS display.

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Press the “3” key to toggle the locking feature ON.

Do your work….

To unlock the instrument repeat steps 1 and 2, except that now the locking is toggled to OFF.

Press “ESCAPE” to return to the MAIN OPERATING display.

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Chapter 7 Operating the ENVI PRO

The information in this chapter is not intended to be a complete tutorial on magnetic surveying, rather it highlights the unique features of the ENVI PRO. Chapter 11 – Applications of this manual covers the subject in more detail. This chapter will cover the following:

• Guidelines for obtaining accurate, meaningful measurements

• Tips on field procedures with the ENVI PRO

• A sample WALKMAG (automatic) mode of survey (basic mode)

• A sample Stop-and-Go (semi-automatic) mode of survey (advanced)

• Base-station magnetometer operation (advanced)

• Search-mode magnetic surveys

• Data correction procedures using the base-station, tie-line or loop survey

modes

• Operating the ENVI PRO under the control of another host computer (remote operation)

Accurate and Meaningful Measurements

The quality of your measurements are greatly affected by the sensor orientation, magnetic gradients and any other source of noise near the sensor. Accurate, meaningful measurements can only be made by observing some simple guidelines as discussed in the following sections.

Orientation

Optimum performance can be achieved with proton magnetometers when the axis of the sensor coils (not the sensor itself) are aligned perpendicular with the Earth’s magnetic field. Proper orientation is of utmost importance at the magnetic equator, where the field is horizontal. In polar regions, the field is vertical and orientation is not as critical.

The sensors have orientation marks. Care should be taken when assembling the gradiometer sensor to align both sensors with each other, such that the whole assembly can be oriented in both the vertical and horizontal modes.

If the sensor is properly oriented, the sensor coil axis points east-west. This also occurs if the sensor is mis-oriented by 180 degrees; that is the N mark points to the south etc. This means that a properly oriented sensor, when mounted fixed onto the Back Plate, is suitable 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 magnetic and therefore upset, locally, the magnetic field to be measured. 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

magnetometers operate, since the precession signal decays more abrupt signal decay at very high gradients, measurements are impossible to obtain.

precession

rapidly. With an

Such

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Also, the closer a sensor is to a highly magnetic object, the higher the gradient the higher the gradient that will be present at the sensor.

Display page 2 of the Numeric Data display (page 5—12) shows a bar graph indicating the decay and the average signal amplitude. It is good practice to get familiar with this feature as it is a useful tool in diagnosing difficulties. Take the MEMF: nn% out from the display

Other sources of noise

Other sources of noise can be objects (such as belt-buckles, branches, etc.) striking the sensor, staff, or console while walking. These can introduce microphonic noise that typically appears as spikes in your data. It is a good practice to secure the sensor cable as much as possible to prevent this microphonic noise.

On the staff

Detectability of anomalies depends on its magnetic moment, the size and the distance from the sensor. The stop-and-go mode of operation, with the sensor on top of four staff sections, is usually used for large low intensity anomalies. Small anomalies are easiest detected using the search mode, with the staff held upside down, with the sensor near the ground.

Note: The sensor has to be oriented for each reading.

Base-station

The Base-station is normally installed as close to the actual survey area as practical to minimize spatial differences in the magnetic field.

The base-station sensor is supported by the staff and secured with the aid of three cords and tent pegs as shown in the figure below. In some situations, it may be more convenient to lash the sensor to a tree. You can also use the standard total-field sensor (page 3—3) instead of the base-station sensor (page 3—3) to operate in the base-station mode, depending upon your particular circumstances.

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Note: The long sensor cable is particularly susceptible to

interference. You should ensure that the sensor cable is kept away from other cables and electrical equipment, especially electrical generators.

Typical base-station sensor setup

Repeated Surveys Lines

If it is necessary to repeat a set of measurements on a survey line, you should take certain precautions to ensure data handling is done in the most effective manner. The ENVI 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 your software.

Hint: 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 about to re-survey line 40N, enter the line number as 40.1N instead.

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Magnetometer Operation

Walkmag Total-Field/Gradiometer Automatic Mode

The following sets of instructions will lead you step by step through the first three survey lines of an imaginary total-field survey looking for buried drums. This should give you a better understanding of what you will be required to do when doing your ENVI 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 place or optional backpack

• Ensure that the sensor orientation is such that when you are walking

along the survey line, the N mark on the sensor is facing magnetic North (or South)

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Typical configuration

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Press the “ON” key to turn the instrument on.

This is described fully in “Configuration menu” on page 6—5.

Check your setup

Set up Line and Station Number and Separations as shown in the example under “Line and Station Setup”.

Do the setup shown under “Sample total-field setup (WALKMAG or WALKGRAD).

Start survey

Proceed to your first location.

Press the “START”key.

Proceed immediately with your desired pace toward the West.

Press the “NEXT” key when the sensor passes 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.

Repeat the previous step at each peg.

At Station 50 W, Press “STOP” right after you have pressed “NEXT”.

If you wish to inspect your data graphically (before you press “ESCAPE”), you will need to press the “NUM/GRA” key. This will show you up to the last 178 readings on the line.

Press the “ESCAPE” key.

Move the cursor to ST: SEP:

Enter 10

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Move the cursor to LN:

Press the “+” (plus) key. The Line number increments to 18.

Proceed to Line 18N, Station 5W.

Press the “START” key.

Press the “NUM/GRA” key to enter the graphics display mode.

Proceed immediately walking to the East.

At each peg, Press the “NEXT” key.

At Station 50E, Press “STOP” right after you have pressed “NEXT”.

Press the “ESCAPE” key.

Change the ST: SEP: to -10.

Move the cursor to LN:

Press the “+” (plus) key. The Line number increments to 20.

Proceed to Line 20N, Station 50E.

7—6

Press “START”, and proceed walking to the West again, etc. The beep indicates the start of the first reading which belongs to Station 50E.

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Walk gently without swinging your shoulders unnecessarily to prevent excessive rotation of the

Hint:

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 as that WALKMAG, with the following exceptions:

Manual Mode – Total-Field/Gradiometer (Semi-Automatic)

These instructions lead you through the steps for the first three survey lines of an imaginary gradiometer survey. A fully manual procedure (using the advanced mode) 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 gives the highest precision by

eliminating the possibility of a small magnetic signature caused by the ENVI

MAG console. The sensor has to be oriented for each reading and should be held as steady as possible.

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7—8

Typical gradiometer configuration

Press the “ON” key to turn the instrument on.

This is described fully in “Configuration menu” on page 6—2.

Check your setup

Set up Line and Station Number and Separations as shown in the example under “Line and Station Setup”.

Do the setup as shown under “Instrument Setup” on page 6—7, except set the CYCLE REPEAT: as no and CYCLE DELAY: as 0.

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Hint:

Do the setup as shown under “Sample stop-andgo gradiometer setup on page 6—11.

To operate as a total-field magnetometer in the Stop-and-Go mode, make the following change in the mag setup: screen, MODE: T-FLD.

Enter a Note as shown under “Note entry” on page 6-19.

Start Survey

Proceed to your first location.

Hold the sensor steady and Press the “START” key to take a reading.

Inspect the data.

Re-adjust the LOCAL FIELD in the mag setup if necessary to the current total-field value.

Press the “RECORD” key to save the data.

Press “ESCAPE”, optionally followed by “OFF”.

Proceed to the next station to the West.

Move the cursor to ST:

Press the “+” key. Verify that the Station has decremented to 40W.

Take a reading and record the data.

Continue along the line and take a reading at each station.

7—9

At 10W, before you press the “START” key, Press the “NOTE” key and then the “1” key to enter the note “fence 1”. You may also enter your Macro or

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any unique note after the measurement, but before you Press the “RECORD” key.

After completing 50W, proceed to 50W on Line 18N.

At the MAIN OPERATING display move the cursor to ST: SEP:

Enter 10.

Move the cursor to LN:

Press the “+” key to increment the line number to 18N.

Take a reading and proceed along line 18N toward the East.

At 10W again, before you press the “RECORD” key, Press the “NOTE” key, and then the “1” key.

After you have finished the line, move to Line 20N and proceed to 50E.

At the MAIN OPERATING display move the cursor to ST: SEP:

Enter -10.

Move the cursor to LN:

Press the “+” key to increment the line number to 20N.

Proceed with Line 20N.

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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

Warning: Please note that repeat measurements will alter the

Station Number and possibly disrupt the correlation between location and data.

To enable both features do the following:

In the Instrument setup, move the cursor to AUTO ST. INC.: Select YES.

In the mag setup, move the cursor to AUTO RECORD: Select YES.

Base Station Operation

Base-station operation is a simple matter of setting up the equipment and getting it operational. A single base-station can be used with a multiple of mobile (portable, airborne) instruments. The base-station sensor(s) should have the same location for multi-day projects.

A chart recorder may be used for a continuous analog output, though the on-line graphics capability may make this unnecessary. See “Data Output Connector” on page 4—2 for more information on this.

The magnetic base-station operation uses the standard base-station sensor with the 50m cable. However, the total-field sensor can also be used for convenience. You will be asked whether you are using a long (50m base-station) or shore (total-field) cable.

After all the equipment has been set up and connected, proceed as described to set up the instrument (or at least to verify proper settings as shown in the “Sample basestation setup” on page 6—14).

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Warning: It is of utmost importance that date and time coincide

on all instruments to successfully correct the mobile data. But if GPS is used, GPS will synchronize the time on all instruments.

Proper correction also requires a base field value, which has to be entered into all magnetometers before the base-station correction

takes place. This usually is one of the first readings of the base-

station taken on the first day of an extended survey. This value must

not be changed while in the same area.

Check your setup

Set up Line and Station Number to the actual location of the base-station. This is recommended to avoid later confusion.

Do the setup as shown under “instrument setup”, except set: CYCLE REPEAT: as no.

Do the setup as shown under “Sample basestation setup”.

Start operation

Press the “START” key, read the console message and act accordingly.

After two or three readings, Press the “STOP” key.

Press the “ESCAPE” key.

Bring up the MAG SETUP display by pressing the “SETUP” key, then moving the cursor to mag setup and pressing the “ENTER” key.

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Enter the measured total-field value as TUN FIELD: and also as the BASEFIELD:

Enter the same Base Field value into all mobile units.

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Note:

Press the “ESCAPE” key and resume the measurement.

Press the “NUM/GRA” key to show the graph.

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 also press the “0” key to center the graph vertically.

Data scrolled off the screen may be inspected using the RECALL feature. This, however, requires interruption of the data acquisition cycle. A change in the graph sensitivity does not affect the recorder sensitivity.

Survey Data Correction Procedures

The purpose of data corrections is to remove diurnal and micro-pulsation effects of the Earth’s magnetic field from the magnetic data and atmospheric effects and transmitter power variations form the VLF total-field data. This gives you the cleanest data possible for interpretation. However, these procedures may not be necessary, if your goal is only target identification (anomaly hunting).

Using Base-Station Data

You can only use base-station data when you have selected one of the advanced (5-

7) survey configurations. This procedure describes the correction when using an ENVI PRO only. The correction with difference instruments must be done independently on a computer.

Warning: The base-station correction physically modifies the data of the

mobile units, but does not alter the base-station’s data. The correction must only be done once. If the raw mobile unit’s data are required, then it must be dumped prior to correction. Please make certain that the BASE FIELD value in the field unit is correct before proceeding.

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To correct your data, proceed as follows:

Connect the units as shown.

Connections for the Base-station correction

Proceed, on both units, to the mag setup: display.

Scroll, on both, to BASE CORRECT.:

Select yes.

You will now see a warning message on the right side of the display of the field unit indicating that the raw data in the field ENVI MAG will not be preserved.

Press the “START” key on both. Either one can be started first.

You will be asked to confirm the start of the data correction by pressing either the “Y” or “N” key.

When finished, Press the “ESCAPE” key.

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Tie-Point (TIE-PT) Mode

This type of correction procedure uses data from repeated stations during the course of the survey to correct for the variations in the earth’s magnetic field or VLF field strength.

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 the subject “Magnetic Correction Techniques” is available from Scintrex.

Note: Both Looping and Line-Type methods can be applied to either

a WALKMAG or a Stop-and-Go type of survey. However, for the Line type, the tie-line itself must be done in the Stop-and Go mode.

Loop type – collecting data

This is the default mode available when you select any of the basic configurations (1-

3) from the configuration menu. To select the LOOP mode, calla up the mag setup: display and:

Move the cursor to TIE-MODE:

Select LOOP

Pick a location in your survey area that you can conveniently come back to during the course of your survey.

At your designated tie-point location, press the “TIE-PT” key instead of the “START” key.

Proceed with your normal survey, but return to your designated tie-point on a regular basis. Always take readings using the “TIE-PT” key instead of the start key at this location. This is illustrated in the following diagram:

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Looping method for collecting correction data

Line type – collecting data

This mode is only available when using the advanced configuration (5-7). See “Advanced mode configuration displays”.

During a traverse along the tie-line, the Station numbers are kept constant, but the Line numbers are changed.

It is assumed that the instrument has been fully setup in advance for other functions. A few setup items have to be changed:

Call up the instrument setup display.

Move the cursor to AUTO STN. INC:

7—16

Select NO.

Call up the mag setup: display.

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Operating

Move the cursor to TIE-MODE:

Select LINE.

Return to the MAIN OPERATING display.

Move the cursor to STN: in the Locations block on the right side.

Enter the Station number at the Tie-Line.

Move the cursor to LN:

Enter the Line number at the start of the Tie-Line.

Press the “TIE-PT” key to take a measurement and record it.

Proceed to the next line.

Move the cursor to LN:

Press the “+” or “-“ key, as needed, to change the Line number.

Repeat steps 12-15 to complete collecting the tieline data.

Proceed with your normal survey as illustrated in the following diagram:

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Operating

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 you survey any lines. This ensures that they will not be erased when clearing memory to make room for the next days data.

Tie-Point Correction Procedure

The Tie-point correction is performed as follows:

Move the cursor to TIE:

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Press the “ENTER” key.

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Operating

You will now see a warning message on the right side of the display indicating that the data will be altered.

Press the key containing “Y” for yes or “N” to abort.

When finished, Press the “ESCAPE” key.

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Chapter 8 Data Output

Note: For data dump please use Windows Hyperterminal S/W,

or Scintrex RS232 Data logger Ver. 1.0.

There are many different types of computers and printers on the market. Consequently, only general instructions on how to dump the data will be given.

The RS-232 cable (p/n 745081) is the link between the ENVI PRO data output connector and the serial port of the computer or printer.

Warning: The null modem (Scintrex p/n 210154), as used for the base-

station correction, must not be used here.

Output Formats

The data can be dumped in several different formats. These formats, for each mode, are discussed here with sample data shown for each. The data is normally fully left justified but are shifted here (for typographical reasons) somewhat to the right. The maximum line length is 80 characters.

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Data Output

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SCINTREX ENVI PRO Operation Manual

Specifications and Main Features

Frequently Asked Questions

User Manual