LMX200 2015 User Guide
2015-00158-00
Warranty Confirmation
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Warranty Confirmation
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SENSORS & SOFTWARE INC. PRODUCT LICENSE, COPYRIGHT, LIABILITY AND WARRANTY
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Important Safety Information
Use the Display Unit only as specified in these operating instructions or the protection provided
by the unit may be impaired.
The battery charger/AC adapter must only be connected to a power outlet which provides a
protective earth (ground).
Connect the AC power cord only to designated power sources as marked on the battery
charger/AC adapter.
The battery charger/AC adapter is rated for indoors use only.
Do not replace detachable MAINS supply cords for the battery charger/AC adapter by
inadequately RATED cords.
The exterior of this product should be cleaned using a damp cloth.
Safety Symbols
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symbol is used to inform you of any potential HAZARD or actions that require your attention.
ix
Table of Contents
x
Table of Contents
Table of Contents
1. Overview ................................................................................................................... 1
2. Assembly .................................................................................................................. 3
2.1. Out of the box
2.2. External GPS (optional)
2.3. Fully Assembled
3
5
7
3. Getting Started ......................................................................................................... 9
3.1.
3.2.
3.3.
3.4.
Powering up
Shutting down
Interacting with the Display Unit
Swipe Down menu
9
11
11
12
4. Tools & Setup ......................................................................................................... 13
4.1. Preferences
4.1.1.
4.1.2.
4.1.3.
4.1.4.
4.1.5.
4.1.6.
13
Language
Units
Volume
Brightness
Auto-Hide Buttons
Anonymous Usage Statistics
14
14
14
14
14
14
4.2. Systems Settings
4.2.1.
4.2.2.
4.2.3.
4.2.4.
14
Date/Time
WiFi Settings
GPS
Reset to Defaults
15
15
18
19
4.3. File Management
4.3.1.
4.3.2.
4.3.3.
4.3.4.
4.3.5.
20
Screenshot Gallery
Delete All Saved Data
Delete Project (Enhanced system)
Map View (Enhanced system)
Export Data
20
21
21
21
22
4.4. System Test
4.4.1.
4.4.2.
4.4.3.
4.4.4.
4.4.5.
4.4.6.
22
System Information
Keypad Test
Odometer Calibration
Sensor Test
Touch Screen
GPS
23
24
24
25
26
26
5. GPR Concepts ........................................................................................................ 29
5.1.
5.2.
5.3.
5.4.
5.5.
Theory
Hyperbolas
Calculating Depth
Soil Calibration values
Air Waves
29
29
30
30
31
6. Line Scan ................................................................................................................ 33
6.1. Selecting a line
6.1.1.
6.1.2.
6.1.3.
6.1.4.
34
Collecting a line - saving data
Collecting a line – No Save Mode
Delete line
View line
34
34
34
34
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Table of Contents
6.2.
6.3.
6.4.
6.5.
6.6.
Acquiring Data
DynaQ
Back-up Indicator
Flags
Line Scan menu options
6.6.1.
6.6.2.
6.6.3.
6.6.4.
6.6.5.
6.6.6.
6.6.7.
35
35
36
37
38
Zoom
Color
Filter
Gain
DynaT
Soil Cal
Interp
38
40
40
41
41
42
43
7. Grid Scan ................................................................................................................ 45
7.1. Grid Parameters
7.1.1.
7.1.2.
7.1.3.
7.1.4.
45
Grid Number
Grid Size
Grid Resolution
Starting data collection
45
46
46
46
7.2. Laying out the grid
7.3. Data Collection
7.3.1.
7.3.2.
7.3.3.
7.3.4.
46
47
Physical Data collection
Data collection on the Display Unit
Recollecting & skipping lines
Processing data
47
47
48
49
8. Slice View ................................................................................................................ 51
8.1.
8.2.
8.3.
8.4.
8.5.
Depth
Color
Grid Lines
Line View
Recollecting lines
52
52
53
55
55
9. Map View ................................................................................................................. 57
9.1. Accessing Map View (LMX200)
9.2. Accessing Map View (LMX200 Enhanced)
9.3. Map View screen
57
57
58
10. Capturing Screens & E-mailing mini-reports .................................................... 59
10.1. Capturing Screens
10.2. Mini-Reports
59
60
11. Transferring Data to a PC.................................................................................... 63
12. Troubleshooting................................................................................................... 65
12.1.
12.2.
12.3.
12.4.
12.5.
12.6.
12.7.
12.8.
Power Supply
System Communications
System Overheating
Display Unit Problem
Wobbly Wheels
Creating a Test Line for Data Quality
Contacting the Vendor for Service
Using the Hotspot on your Smartphone
65
65
66
66
66
66
67
67
13. Care and Maintenance ......................................................................................... 69
13.1. Battery Care
13.2. Cable Care
69
69
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Table of Contents
13.3. Skid Pads
13.4. Odometer
13.5. Storage Cases
70
70
70
14. Technical Specifications ..................................................................................... 71
Appendix A: Health & Safety Certification ................................................................A1
Appendix B: GPR Emissions, Interference and Regulations ..................................B1
Appendix C: Instrument Interference ........................................................................C1
Appendix D: Safety around Explosive Devices ........................................................D1
Appendix E: WiFi Module ........................................................................................... E1
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xiv
WiFi Module
1. Overview
The manual references embedded software version V1R1. To see which software version is
installed on your system, see the Swipe Down menu in Section 3.4.
The LMX200 is a complete Ground Penetrating Radar system, offering two modes for acquiring
data: Line Scan and Grid Scan. Once the unit is assembled and powered-up, you can start
conducting a GPR survey in less than a minute.
Features of the LMX200 include:
•
High visibility, touch screen display
•
Display depth slices from collected grids, right in the field
•
UWB Antenna producing highest data quality
•
Dynamic Target Enhancement (DynaT), allows user to selectively view small, medium or
large subsurface targets
•
Lightweight fibreglass cart frame
•
Built-in WiFi capability
•
Integrated GPS receiver with optional external GPS for increased positional accuracy for
geo-referencing data
•
Ability to mark surface flags and subsurface interpretations
•
Display your travelled path and targets in Map View
•
Seamless export of data to EKKO_Project software for further data analysis
1
Overview
The LMX200 is also available in an Enhanced configuration. The chart below summarizes the
differences between the two configurations:
Criteria
LMX200
LMX200 Enhanced
How is data
saved?
Screenshots (.JPG)
Screenshots (.JPG) and .GPZ files
How much data
can be saved?
•
10 grids
•
99 lines
•
999 screenshots
9 Projects each with:
•
10 grids
•
99 lines
•
999 screenshots
File organization
Lines and Grids
Projects containing Lines, Grids &
Screenshots
Map View
Displays a single line or grid
Shows all lines/grids in a Project
PC-based data
display
Any .JPG viewing software
Data can be opened in
EKKO_Project
2
WiFi Module
2. Assembly
2.1. Out of the box
You will find the following components in your LMX200 box. Some of these may already be
assembled.
Attach the Cart Handle to Cart Base using the Handle Pins. Ensure the Display Unit Tray is
facing the operator.
3
Assembly
Attach the GPR Sensor to the Cart using the Sensor Support Straps. Ensure the Sensor is
oriented the correct way with the connections toward the back of the Cart. Using the Sensor
Support Straps, adjust the height of the Sensor so it is 1-2 cm (½ – ¾ inch) above the ground.
The best way to get a uniform Sensor height is to place a couple of sheets of thick cardboard,
particle board or Styrofoam under the sensor before securing the Sensor Support Straps.
Attach the Display Unit onto the Display Unit Tray on the Cart. The Display unit slides down into
the tray, catching on both sides of the mount and is held in place with the pull pin. When a click
is heard, the Display Unit is firmly in place. Adjust the angle of the Display Unit by loosening the
hand-screws underneath the Display Unit Tray, rotating the Display Unit to the desired angle
and tightening the hand-screws. To remove the Display Unit, disconnect all cables, pull out the
pull pin and lift the Display Unit up.
4
Assembly
Attach the Display Cable to the back of the Display Unit with the jackscrews. Connect the other
end of the cable to the Sensor. Ensure the cable is routed as shown below.
Attach the Odometer and Battery Cables. The Odometer Cable connects to the closest
receptacle on the Sensor. Attach the Battery Cable to the Sensor and the Battery. The system
is now setup and ready to use.
2.2. External GPS (optional)
The instructions for connecting the GPS, mount and cable are below:
5
Assembly
GPS Mount – The GPS mount attaches to the crossbar frame above the battery, using a quick
release pin. There is a pipe plug that needs to be removed first.
Once that is done, ensure the pole is pointed up, then insert the GPS mount into the opening
where the plug was removed and secure with the quick release pin. This allows the GPS to sit
directly over the middle of the GPR sensor. It comes with 5/8-11 UNC-1A threads at the top of
the pole, which is standard for many GPS receivers.
GPS – If you have purchased the Topcon GPS from Sensors & Software, this can be screwed
onto the threads at the top of the GPS mount. Connect one end of the GPS cable to the GPS
receiver, and the other end to the serial port on the back of the display unit. This single cable
powers the GPS and receives data from it. Ensure that the Display Unit is powered down when
connecting or disconnecting the GPS cable.
NOTE: Since the serial port of the Display Unit outputs power (current=1A, voltage=12V), be
very careful if connecting other GPS units to the serial port. Verify the pins on the drawing
below.
6
Assembly
2.3. Fully Assembled
The fully assembled LMX200 will look like the following. Simply reverse directions to
disassemble for transport.
7
Assembly
8
Getting Started
3. Getting Started
3.1. Powering up
When the battery is first plugged in, the LED goes green for 5 seconds then disappears.
To start the system, press the red power button on the display unit. The LED on the front panel
will light up red.
LED light
Power
button
Figure 3-1: Front of Display Unit
Once boot up is complete, the colour of the LED will indicate the amount of battery power
remaining:
• 100% to 20% = green
• 20% to 10% = orange
• 10% to 0% = red
Once the system boots up, you will see the main screen (Figure 3-2). If you have purchased (or
upgraded to) the LMX200 Enhanced system, you will see a slightly different main screen (Figure
3-3).
9
Getting Started
Figure 3-2: Main Screen for LMX200
Figure 3-3: Main Screen for LMX200 Enhanced
The differences between the two configurations are described in Section 1. Everything remains
the same in the on-board software, except for the Enhanced system, the main screen will allow
you to organize data into projects. Within each project, you can have a number of lines and/or
grids.
From the main menu of the Enhanced system, select the project number to work in. Projects
that contain data are in red color, whereas those with no data are in green. As you change
projects, the main screen will also display the number of lines and grids collected in each
project. These will appear under the Line Scan and Grid Scan buttons respectively.
10
Getting Started
3.2. Shutting down
To power down, press the red power button on the display unit once. A confirmation message
will appear, after which you can press Yes to proceed. If necessary, a hard reboot can be done
by pressing and holding the red power button until the unit shuts down.
3.3. Interacting with the Display Unit
Data collection is controlled by the Display Unit. The Display Unit has embedded software to set
survey parameters and collect, display and store data.
The Display Unit offers touch screen operation, as well as a water-resistant membrane keypad
with a number of buttons that can be pressed to perform various tasks. Most operations can be
done using either the touch screen or the keypad.
Use the following table as a guide to working with the keypad on the Display Unit:
Item
Description
Menu Buttons
The yellow buttons labelled 1 to 8 correspond to menu choices
that appear on the screen.
4-way directional keypad
Controls Up/Down/Left/Right operations in certain menus.
Camera
Saves a screenshot of line data, grid data or the Map View
display.
Asterisk / Special Function
Used for adding Flags during data acquisition, and to quickly
enter the No Save mode for Line Scan data collection.
11
Getting Started
3.4. Swipe Down menu
Figure 3-4: Swipe-Down menu
When the Display Unit is powered on (except during data acquisition), you can “swipe” your
finger from the top of the screen towards the bottom, to bring up a drop-down menu (Figure 3-4)
with the following items:
Date and Time: The current date and time (12 hour clock). The time needs to be changed in
areas that observe daylight-savings-time.
Battery: The battery icon displays the amount of power remaining in the battery. If the battery
power is getting low, the icon will change color to orange and red to match the LED color on the
keypad.
GPS: Shows which GPS is being used (Internal or External) and the signal strength.
WiFi Network: Indicates if the system is connected to a wireless network and, if so, the name of
the network. See 4.2.2 for details on connecting the system to a wireless network.
Volume: The Volume + and - buttons are used to increase and decrease speaker volume.
Brightness: The Brightness + and - buttons are used to increase and decrease the screen
brightness. For example, increasing the Brightness setting may improve the visibility of the
screen in bright sunlight. Note, however, that increasing the screen brightness also increases
power consumption, thus reducing battery life.
To close the Swipe-Down menu, touch anywhere on the screen below the swipe-down menu.
12
Tools & Setup
4. Tools & Setup
From the main screen shown in Figure 3-2 or Figure 3-3, press Tools to enter this sub-menu.
Here you can set preferences, adjust system settings, perform system tests and manage files.
You will see the screen shown in Figure 4-1:
Figure 4-1: Tools menu
4.1. Preferences
Selecting the preferences option will take you to the sub-menu shown in Figure 4-2.
Figure 4-2: Setting Preferences
13
Tools & Setup
From here you can select the following:
4.1.1. Language
Pressing Language will cycle between available languages.
4.1.2. Units
Pressing Units will cycle between US Standard and Metric Units.
4.1.3. Volume
Scroll bar for adjusting the volume of clicks and beeps heard during operation. This can also be
changed by using the Swipe Down menu (Section 3.4) anytime the system is not collecting
data.
4.1.4. Brightness
Scroll bar for adjusting the brightness of the screen. Note that increasing the brightness
consumes more battery power. This can also be changed by using the Swipe Down menu
(Section 3.4) anytime the system is not collecting data.
4.1.5. Auto-Hide Buttons
If this is set to ON, then in Line Scan mode, the buttons at the bottom of the screen disappear
shortly after data collection begins, effectively enlarging the area for data display. The buttons
will re-appear after a couple of seconds whenever the sensor stops moving forward, is in backup mode or any button is pressed on the keypad.
4.1.6. Anonymous Usage Statistics
This is set to OFF by default. When this is set to ON and the user is connected to a wireless
network, any system malfunctions will trigger an automatic notification to Sensors & Software.
This is to help with gathering information about any system irregularities. As the name
suggests, the notification is completely anonymous and no personal information is sent.
4.2. Systems Settings
Press System Settings to enter the menu shown in Figure 4-3.
14
Tools & Setup
Figure 4-3: System Settings
From here, the following settings can be changed:
4.2.1. Date/Time
Set the date & time by pressing this button.
4.2.2. WiFi Settings
Connecting to a wireless network allows you to send a mini-report to someone by e-mail. In
order to send reports to an e-mail address there are 2 main steps required.
First, the user must establish a Gmail account online. This account is used as the account that
sends the message to the desired recipient. All mini-reports received by the recipient will look
like they are coming from this account. This account will contain all the seny messages in its
sent box.
The second step is to connect to a wireless network. This connection gives you access to the
internet to connect to your Gmail account. This connection can be through a standard wireless
network or through a hotspot on your cell phone for connecting while in the field.
If you are already connected to a WiFi network, the name of the network is listed beside the
WiFi Network field. Pressing the WiFi Settings button at the bottom of the screen takes you to
a sub-menu (Figure 4-4) for connecting and configuring WiFi settings, as well as setting up an
e-mail address.
15
Tools & Setup
Figure 4-4: Configuring Wireless settings and E-mail address
The color of the Network Name indicates the status:
•
•
•
Green = Connected
Yellow = not currently connected, but remembered from before when you previously
connected and entered a password.
White = Not connected
Note that LMX200 CANNOT connect to Public Hotspots (typically restaurants, hotels and
airports) that require a web-based login and acceptance of their Terms & Conditions. It
also CANNOT connect to unsecured networks (networks that do not require a password).
o
Connect – Select the desired network and press Connect.
If the connection is successful (this can take a minute or so) a screen appears asking for the
password for that network. If the network name is yellow (from a previous connection to this
network), it will not ask for a password because it is a remembered network. Once it
connects the Network Name will turn green.
o
Forget – Use the Forget button to remove the password for connected or remembered
networks (text in green or yellow). Use the 4-way directional arrows or touch screen to
select the network. Once the ‘forget’ button is pressed on a selected network it will remove
the password and the Network Name will turn white.
o
Scan – Scans for any available networks in the area and displays them in order of strength
of signal.
o
Details – pressing this button displays the security settings related to the selected network.
16
Tools & Setup
o
Setup E-mail – This option allows the user to save their Gmail account (email and
password) to the LMX200, thereby enabling them to e-mail mini reports from the job site.
Before selecting this option:
1. You must be connected to WiFi – a wireless network listed must be green.
2. The Gmail account needs to be set up prior to adding it into the system (go to
https://accounts.google.com/SignUp).
After entering the email address, a message appears stating either that the email address
has been saved, or that the setup has failed.
If the address has been saved, you are ready to send mini reports.
If setup failed, there are 3 possible reasons:
1. Email address or password was entered incorrectly – try re-entering these fields.
2. The Display Unit is not connected to the internet – try reconnecting to a known
network. Note that any networks requiring a web-based login will not work on the
Display Unit.
3. Your email security settings may need to be adjusted, as shown below.
Note: the following screen images from Gmail are current as of writing this manual.
However, these may change over time as Gmail updates their menu layout.
To edit the security settings, open your Gmail account in a web browser and click on
your email address in the top right corner. In the drop down Window that follows,
click on My Account.
17
Tools & Setup
You will then see the screen below. Click on Connected apps & sites
On the page that follows, ensure the setting “Allow less secure apps” is set to ON
4.2.3. GPS
Pressing GPS from the System Settings menu takes you to the GPS sub-menu (Figure 4-5).
The options displayed in the sub-menu are listed below:
18
Tools & Setup
Figure 4-5: GPS Sub-menu
o
GPS Mode –you can select whether to use the internal GPS, external GPS or no GPS at
all (Off)
o
Units – GPS units can be either UTM (Universal Transverse Mercator) or
Latitude/Longitude coordinates
o
GPS Test – see Section 4.4.6
4.2.4. Reset to Defaults
This will reset all settings & preferences back to the initial settings when the system was
shipped. Pressing this will ask you to confirm the Reset to Defaults. If Yes is selected, the next
screen will ask if you would like to remove all saved wireless networks and e-mails addresses.
Figure 4-5: Reset to Defaults, a) Image on left is the first confirmation screen. b) If you press Yes, you will see the
second confirmation screen on the right asking about deleting e-mails and WiFi settings.
19
Tools & Setup
4.3. File Management
Press File Management to enter this sub-menu. From here, the user can view screenshots,
export data and delete all data. If you have the regular LMX200, you will see the image in
Figure 4-6a. If you have the LMX200 Enhanced system, you will see the image in Figure 4-6b.
Figure 4-6: a) LMX200 system on left, displays the total number of lines, grids and screenshots saved on the system.
b) The LMX200 Enhanced system on the right displays the lines, grids and screenshots for a given project in the
middle column. The right column displays the total for each that are saved on the system.
A description of each of the buttons is given below:
4.3.1. Screenshot Gallery
This allows the user to view all screenshots that were saved by pressing the Camera button
(Section 10.1). The display will show a Tile View of four screenshots per page (Figure 4-7). If
there are more than four screenshots, swipe the screen from right to left to view the rest.
Alternatively, you can also use the Left and Right arrow keys on the 4-way directional keypad
Figure 4-7: Tile View in Screenshot Gallery
20
Tools & Setup
From the Tile View, the user has the following options:
•
E-mail – pressing this button will e-mail the selected screenshot (provided you are
connected to a wireless network and have setup a Gmail account to send from, Section
4.2.2). You will be prompted to enter an e-mail address, or you may use the most recent
one which will be listed by default.
•
Delete – pressing this button will delete the displayed screenshot.
•
Expand – press this button to show the selected screenshot as a full screen image. On
the subsequent screen, press Tile View to return to the screen displaying four
screenshots per page.
4.3.2. Delete All Saved Data
Pressing this will delete all data saved on the system. There is a confirmation window asking if
you are sure; press Yes to continue deleting, press No to cancel.
4.3.3. Delete Project (Enhanced system)
Pressing this will delete the current project number. There is a confirmation window asking if
you are sure; press Yes to continue deleting, press No to cancel.
4.3.4. Map View (Enhanced system)
Pressing this will display a map view for all the data (lines & grids) in a given Project (Figure 48). Map View is only enabled if a GPS was on during data collection. Map View shows the
survey path travelled, as well as any flags or interpretations added to the data. Map View is
fully explained in Section 9. While Map View is available in both configurations, the Map View
button in File Management is only available in the Enhanced version.
21
Tools & Setup
Figure 4-8: Map View showing two grids and a long line with interpretations. Map View is enabled because the data
was collected with GPS.
4.3.5. Export Data
Screenshots and data are always saved to the internal memory of the Display Unit. If a USBdrive (memory stick) is inserted into the USB port on the Display Unit, pressing the Export Data
button will copy all the data files to the USB-drive. If no USB-drive is inserted, this option will
not be accessible.
4.4. System Test
The system test sub-menu (Figure 4-9) allows the user to perform certain tests to ensure proper
operation of the system. Select the component to test then press Start. After completing a test
there is an indication of whether the system passed or failed the test. Each test is described
below in more detail.
22
Tools & Setup
Figure 4-9: System Test menu
4.4.1. System Information
System Information is the only option in System Test which is not actually a test. Here
information such as the version, serial numbers, temperature and battery power are displayed.
(Figure 4-10).
Figure 4-10: System Information
23
Tools & Setup
4.4.2. Keypad Test
The keypad test ensures that all buttons on the membrane keypad are working. Press Start to
begin the test which requires the user to press each button once, within a 20 second timeframe
(Figure 4-11).
Figure 4-11: Keypad Test
The Test LED button will test just the LED, and ensure that the color of the light on the screen
matches the color of the LED itself.
4.4.3. Odometer Calibration
This test ensures that the odometer is calibrated properly for distance. Even though the
odometer is calibrated in the factory, you must calibrate it periodically to ensure accuracy.
Choose a set distance from the screen, press Start and then move the system that exact
distance, using a measuring tape or other known distance indicator. Press Finish when you
have travelled that distance (Figure 4-12).
Figure 4-12: Odometer Test. Image on the left shows the screen where the user must select a distance. The image
on the right instructs you to move that distance then press Finish.
24
Tools & Setup
Upon completion, it displays the screen in Figure 4-13. The new calibration value is shown to
the right of the arrow in number 1. You can either accept the new value (by pressing ‘1’ on the
keypad) or revert back to the previous value (by pressing ‘8’ on the keypad). If the new value is
significantly out of range, the test will fail.
The odometer calibration value is stored in the Display Unit. If the Display Unit is changed, or
swapped out, you will need to run the Odometer Calibration test again.
Figure 4-13: Results of Odometer Test
4.4.4. Sensor Test
This test checks proper operation of the GPR sensor, including the amplitude of the pulse.
Once the cart is tipped backwards and start is pressed, it will conduct the test (Figure 4-14). If
there are any irregularities, the test will indicate failure.
Figure 4-14: Sensor Test
25
Tools & Setup
4.4.5. Touch Screen
The test checks proper operation of the touch screen (Figure 4-15). It allows you to test the
screen (by pressing Test) or perform a quick calibration followed by a test (by pressing
Calibrate). Both involve touching targets on the screen in the allotted time.
Figure 4-15: Touch Screen test on the left, Touch Screen calibration test on the right
4.4.6. GPS
The GPS test will ensure that the system is communicating properly with the GPS and receiving
data. Whichever GPS mode is selected in the System Settings (4.2.3) will be the one used for
the test. Pressing GPS will show the screen in Figure 4-16.
Figure 4-16: GPS Test
The basic position and time information is displayed on the screen. On the screen, the Fix Type
notes if there are any corrections being applied, such as DGPS.
26
Tools & Setup
Pressing Strings will display the raw data strings that are outputted by the GPS (Figure 4-17)
as they scroll down the screen. The user may select this option to verity the GPS is outputting
the proper NMEA string format.
Figure 4-17: GPS Strings
Pressing Clear will clear the strings. Pressing Info will return to the main GPS test menu.
If you choose to connect a 3rd party GPS receiver, you must ensure the following parameters
are set for the GPS to communicate with the Display Unit:
-
Baud rate = 19,200
-
Output string = NMEA
-
NEMA string must include $##GGA
-
Parity = None
-
Stop Bits = 1
-
Data Bits = 8
27
Tools & Setup
28
GPR Concepts
5. GPR Concepts
5.1. Theory
Ground penetrating radar (GPR) technology uses radio waves to image objects in the
subsurface. The subsurface may consist of soil, rock, asphalt and other materials. GPR
systems emit high frequency radio wave pulses and detect the echoes that return from objects
within the subsurface. Echoes are produced when the target material is different from the host
material (eg. PVC pipe in gravel)
5.2. Hyperbolas
The GPR display shows signal amplitude versus depth (time) and sensor position along a line.
This is called a “Line Scan”. Since radar energy radiates in a 3D cone shape rather than a thin
beam, a hyperbola (or inverted U) is the GPR response from a small point target like a pipe,
rock, or a tree root. The radar wave hits the object before and after going over it and forms a
hyperbolic reflection that can appear on the record even though the object is not directly below
the radar:
29
GPR Concepts
Hyperbolas are best viewed when subsurface targets are crossed perpendicularly or at a 90
degree angle. The actual position of the object is located at the apex of the hyperbola.
Apex of hyperbola is where objects is
located
5.3. Calculating Depth
Ground penetrating radar records the time it takes a radio wave to travel to a target and back; it
does not measure the depth to that target directly. Depth to target is calculated based on the
velocity with which the wave travels to the target and back.
To calculate depth:
= /2
ℎℎ
ℎ − For the LMX200, velocity is indicated by the Soil Calibration Value, known as Soil Cal. Once
the Soil Cal values are set, the measured depths will be determined accurately (Section 6.6.6)
5.4. Soil Calibration values
Below is a table of common subsurface materials and their corresponding Soil Cal. This is only
a guideline and there is some variation based on the fact that there can be a mixture of different
materials in the subsurface. By far, the soil water content has the biggest influence on Soil Cal
values.
30
GPR Concepts
Material
Soil Cal
Air
300
Ice
160
Dry Soil
140
Dry Rock
120
Soil
100
Wet Rock
100
Concrete
100
Pavement
100
Wet Soil
65
Water
33
5.5. Air Waves
Some hyperbolas are caused by air wave reflections from objects above ground, such as posts,
fences, overhead wires, and trees.
The following image displays how air wave reflections affect data:
An important part of understanding the data image is learning to recognize these unwanted "air"
targets and distinguish them from the targets in the ground. Good field notes are indispensable
for helping identify unwanted events on the data.
The best way to identify air reflections is the target hyperbola method. Hyperbolas from above
ground objects are wider than objects in the ground and will have a Soil Cal at, or close to, 300.
To learn more, see Soil Cal (6.6.6).
31
GPR Concepts
32
Line Scan
6. Line Scan
Line Scan mode allows the operator to acquire data along a straight line and examine it as a
cross-section image. The operator can locate a feature and easily back-up and mark the
location of that object on the ground. Line Scan mode can be used to identify the alignment of
subsurface features, check for linearity and acquire accurate depth measurements.
If you have the LMX200 Enhanced, ensure you are in the appropriate project before entering
this mode.
From the main screen, press the Line Scan button; you will see the screen shown in Figure 6-1.
Figure 6-1: Line Scan mode
The GPS Status indicates the quality of the GPS signal, which is based on the number of
satellites that it sees. The chart below explains what the colours and bars mean:
Indicator Color
Red
Red
Orange
Green
Green
# of bars
1
2
3
4
5
33
# of Satellites
4, 5
6, 7
8, 9
10, 11
12+
Line Scan
6.1. Selecting a line
To select the desired line, press the + and - buttons under Line Number on the bottom of the
screen. Alternatively, you can also use the + and - buttons beside the word Line on the upper
part of the screen.
New line numbers are shown in white, whereas lines that already contain data are shown in red.
If a line is shown in white (Figure 6-1), the following options are available:
6.1.1. Collecting a line - saving data
Press Start to enter data acquisition. All data collected will be saved under this line number.
6.1.2. Collecting a line – No Save Mode
Press No Save Mode to enter data acquisition or press the Asterisk key on the Display Unit.
Any data collected will NOT be saved.
If a line is shown in red (Figure 6-2), the following options are available:
6.1.3. Delete line
Press Delete to delete this line.
6.1.4. View line
Press View to view the line. See Section 6.6 on Line Scan menu options.
Figure 6-2: Line Scan mode, showing a line that was previously collected
34
Line Scan
6.2. Acquiring Data
Press the Start button to begin collecting data. The screen will change to the data acquisition
screen. As the system is pushed along a straight line, the collected GPR data scrolls onto the
screen from the right and moves to the left (Figure 6-3).
The depth scale along the side of the GPR Line image and the position scale along the top of
the image are set to Metric or US Standard units based on the setting in the Preferences menu
(4.1.2)
If Auto-Hide Buttons is set to ON (Section 4.1.5), the menu at the bottom of the screen
disappears as soon as you start collecting new data, thereby maximizing the data display area.
When the user stops, backs up or presses a button on the keypad the menu reappears.
Position
Axis
Depth
Axis
Figure 6-3: Line Scan acquisition mode, showing collected data and axis labels
6.3. DynaQ
The LMX200 uses DynaQ, an advanced patented technology that adjusts data quality as the
system movement speed varies. In most situations, moving the system at a comfortable walking
speed generates data of good quality. In situations where target resolution or maximum
penetration depth is critical, moving slower increases data quality.
As the Line Scan data scrolls on the screen, the DynaQ Index Bar is displayed along the bottom
of the screen (Figure 6-3). The color of the bar indicates the quality of the data at that point
along the line:
White
Yellow
= No Data (too fast!)
= Moderate quality
35
Line Scan
Light blue = Better quality
Dark Blue = Highest quality
In general, avoid collecting data at extremely high speeds.
6.4. Back-up Indicator
Line Scan mode incorporates a back-up feature to enable you to accurately locate targets and
mark them on the ground. After acquiring some data on the screen, move the system
backwards (Figure 6.4a). During back-up mode, there will be two indicators:
•
Position Indicator: The red vertical line corresponds to the location at the center of
the GPR sensor. As you pull the cart backwards, the Position Indicator moves to
mark the current location of the cart in the image and a box appears with the current
position, relative to the start of the line, listed as the top number.
Figure 6-4: a) Back-up Indicator, b) Moving the Depth Indicator to the top of the hyperbola
•
Depth Indicator: A short red horizontal line corresponds to the current depth value,
as shown in the bottom number in the box. To determine the depth of an object,
move the indicator up or down by dragging the horizontal line to the desired location
(Figure 6-4b). Alternatively, you can also use the Up and Down arrows on the 4-way
directional keypad. Note: make sure you have done a Soil Cal to ensure depth
accuracy (Section 6.6.6).
To locate a feature, simply roll the system back along the same path until the red vertical line is
exactly over the response (usually a hyperbola). You can mark the location of the object on the
surface and continue data collection. Once you reach the point where you initially started
backing-up, the system will continue acquiring new data.
You can also obtain depth and position information anywhere on the Line Scan by touching the
screen and holding for a second. A cross-hair appears where you touched the screen, with a
box displaying the position and depth (Figure 6-5). To get the position and depth information
36
Line Scan
about a different point on the screen, simply touch and drag the box or cross-hair to the desired
position.
Figure 6-5: Touch screen to get depth and horizontal position at any point
Pressing Stop ends the line. This line is saved internally on the system and cannot be added to.
6.5. Flags
Flags are often inserted to mark noteworthy surface features, such as poles, sidewalks,
changes in terrain etc. These markers may help you correlate subsurface targets with above
ground features.
Pressing the asterisk button on the keypad will insert a flag at your current position, either
during forward data acquisition or when backed-up. Flags are sequentially numbered (Figure 66).
37
Line Scan
Figure 6-6: Inserting Flags
6.6. Line Scan menu options
All the settings described below change the way the data is viewed on the screen. They do not
alter the saved data in any way. These settings can be altered while you are still collecting
data, or after you have pressed Stop.
6.6.1. Zoom
This button controls the aspect ratio of the displayed GPR data. Pressing the Zoom button
changes the buttons on the bottom menu, which are explained below:
•
Depth – Pressing + and - under the Depth button allows you to change the display
depth of the data. This is commonly referred to as the depth window. The pre-set
values range from 1m to 8m (3’ to 25’), see Figure 6-7.
If the data was collected with a shallower depth, the depth setting can still be increased
after the fact, when reviewing the data. In general, it’s a good idea to set your displayed
depth to 1.5 - 2 times the depth you expect the deepest target to be.
•
Position – Pressing + and - under the Position button allows you to change the length
of data display on a single screen. This is also known as horizontal scaling. The pre-set
values range from 10m to 30m (25’ to 100’), see Figure 6.8.
One reason for setting this to 30m would be to fit more data on the screen and look for
consistency among hyperbolas that were crossed.
38
Line Scan
Figure 6-7: Varying displayed depth
Figure 6-8: Varying position, or horizontal scaling
39
Line Scan
6.6.2. Color
Pressing this changes the color palette for the GPR Lines. There are 8 different color palette
options. The image is automatically re-displayed as the color palette changes. A few sample
color palettes are shown in Figure 6-9.
Figure 6-9: Changing Color palettes
6.6.3. Filter
When the filter is ON, flat-lying responses in the data are filtered out so that hyperbolic
responses from objects are enhanced (Figure 6-10). Filtering also helps identify shallow targets
that might be masked by the strong signals at the top of the image. However, it will also filter
out other flat-lying responses, such as soil boundaries, so be careful when using this option if
your target is flat. The filter is set to ON by default
Figure 6-10: Left image shows Filter On, while the right shows the same data with the Filter Off.
40
Line Scan
6.6.4. Gain
Since the material being scanned absorbs the GPR signal, deeper targets return weaker
signals. Gain acts like an audio volume control, amplifying signals and making deeper targets
appear stronger in the image. Gain values vary from 1 to 9 where 1 means a minimal
amplification has been applied and 9 means that maximum amplification has been applied.
Pressing this button increments the gain; once you reach 9 it cycles back to 1. Avoid overgaining the data as it can make interpretation difficult. In general, soils that are more electrically
conductive (eg. clays) will require a higher gain compared to soils that are less electrically
conductive (eg. sand).
Figure 6-11: Varying the Gain
6.6.5. DynaT
DynaT is a feature that can selectively enhance small, medium or large size targets for easier
viewing and detection. Pressing DynaT cycles between options: All, Small, Medium and
Large. Each option allows the user to enhance part of the ultra-wide band (UWB) spectrum to
focus on those desired features.
Selecting Small will show more of the smaller hyperbolas and more detail, whereas Large will
focus more on the larger targets with better depth penetration. Selecting All will show a
combination of small, medium and large targets.
41
Line Scan
Figure 6-12: DynaT settings: a) Top left shows All b) Top right set to Small targets c) Bottom left set to Medium
targets d) Bottom right set to Large targets
6.6.6. Soil Cal
The soil calibration (also known as velocity) is a parameter used to ensure that measured
depths are accurate. The best way to ensure this is by using the hyperbola-fitting method, since
it is based on data collected in the area.
Crossing linear targets like pipes or cables at a 90 degree angle produces a hyperbola suitable
for soil type calibration. The Soil Cal value obtained will be used to compute a depth estimate of
a target. These depths will be incorrect if the soil type is calibrated on a target hyperbola
produced at an oblique angle, rather than 90 degrees.
Once you have a hyperbola on the screen from a subsurface target, press Soil Cal. The menu
at the bottom of the screen will change, giving you the option of specifying a Soil Type or
adjusting the Soil Cal using the hyperbola-fitting method (Figure 6-13a).
•
Soil Types – If there are no targets to calibrate to, and you know the type of soil, press
this button to vary between the following mediums, with the pre-set Soil Cal value shown
in brackets:
o
very wet (60)
o
wet (80)
o
moist (100)
42
Line Scan
•
o
dry (120)
o
very dry soil (150)
o
air (300)
Soil Cal – allows you to use hyperbola-fitting to determine a more accurate Soil Cal.
Touch the screen to move the red hyperbola such that it lies over a real hyperbola from
the ground (Figure 6-13b). Use the 4-way directional keypad to fine tune the
movements. Then use the + and – buttons on the Soil Cal button to widen or tighten the
shape. Once the shape is matched (as shown), you now have the correct Soil Cal and
the measured depths will be most accurate. Press Apply to use this value. If you get a
Soil Cal near 300, this could be an Air Wave (Section 5.5), and you should calibrate to a
different hyperbolic response.
Figure 6-13: Adjusting Soil Cal, a) initial screen b) moving the red hyperbola over a hyperbolic response from a
subsurface target
6.6.7. Interp
Short for field interpretation, Interps are used to mark subsurface features. Seven colours are
available, which allow you to designate different types of subsurface objects.
Either during collection, back-up or review, you can simply touch anywhere on the screen to add
an Interpretation (Figure 6-14). This appears as a dot of whatever colour is selected. To
change the color, press the Interp button to see a selection of colours and to select a new one
(Figure 6-15).
To remove an Interp, ensure the same color is currently active and simply touch the Interp to
make it disappear.
These field interpretations remain with the data and can be used to check if a feature is linear
(in Map View or in Google EarthTM), but only if the more accurate external GPS is used.
43
Line Scan
Figure 6-14: Touching the screen to put Interps
Figure 6-15: Available colors for Interps
44
Grid Scan
7. Grid Scan
Grid scans are conducted to generate depth slices over a given area. This is useful for locating
all known and unknown objects, as well as their orientation, in a graphical manner that is easy
to interpret.
From the main menu (either in Figure 3.2 or 3.3), press the Grid Scan button to enter the Grid
setup menu.
7.1. Grid Parameters
The screen in Figure 7-1 will allow you to set parameters of the grid, before data acquisition
begins.
Figure 7-1: Grid Scan setup, from the Enhanced system. On the standard LMX200, it will be the same, except there
will not be a project number
7.1.1. Grid Number
To select a grid number, press the + and - buttons under Grid Number at the bottom of the
screen. Alternatively, you can press the + and - buttons on the screen beside Grid on the upper
part of the screen. Grids that contain no data will have the text shown in green.
If a grid already contains some data, it will be shown in red and you will not be able to change
the size or resolution. You will just have the option to select:
•
Slice View – view the depth slices
•
Delete Grid – delete all the data in this grid
You can press Start to enter a previously collected grid, either to view data or recollect a line.
45
Grid Scan
7.1.2. Grid Size
Press the + and - buttons under Grid Size at the bottom of the screen to change the dimensions
of the grid. Alternatively, you can press the + and - buttons on the screen beside Grid Size on
the upper part of the screen.
In metric units, the available grid sizes are 5m x 5m, 10m x 10m and 15m x 15m.
In US standard units, the available grid sizes are 10ft x 10ft, 20ft x 20ft and 50ft x 50ft
7.1.3. Grid Resolution
Grid resolution determines the spacing between grid lines. This can be varied by pressing the +
and - buttons under Grid Resolution at the bottom of the screen. Alternatively, you can press
the + and - buttons on the screen beside Grid Resolution on the upper part of the screen.
Available options are 0.25m, 0.5m and 1.0m in metric units and 1, 2 & 5 ft in US standard units.
The best images will result when the smallest resolution value is used.
Calculating Resolution
The size of target will determine line spacing. The system must pass over a target to detect it;
line spacing needs to be on the order of the size of the target or smaller when practical. This
can be adjusted to a larger spacing for larger targets or targets that are linear. As well, these
rules may have to be bent for practical purposes such as survey production rates. Tighter line
spacing takes longer to collect and may not be economically possible in all circumstances.
Note that the system will not allow you to select a 10'x10' grid with a low resolution of 5', as this
resulting image will be very poor due to inadequate data collected.
7.1.4. Starting data collection
Press Start when all the parameters are setup and data collection is ready to begin
7.2. Laying out the grid
Positional accuracy of each line is vital to locating targets of interest once data has been
processed.
For linear targets such as pipes and utilities, the best GPR responses occur when the GPR
survey line crosses the target at right angles. Keep this in mind when laying out the grid and the
orientation. Sometimes, laying out a grid with straight lines and corners at 90 degree angles
can be difficult. Sensors & Software’s “EasyGrid” makes this task easy. To learn more, contact
Sensors & Software.
An example grid layout is shown in Figure 7-2.
46
Grid Scan
Figure 7-2: Example of a grid survey. The red lines are superimposed just to illustrate the concepts.
7.3. Data Collection
7.3.1. Physical Data collection
It is critical that the starting position is consistent on every line. Line up the middle of the unit
with the starting line, and then push the system straight towards the end of the line. It is helpful
to have a marker at the end so you have something to aim for.
Not all lines have to be finished. If there is an obstruction preventing you from finishing the line,
you can simply press Stop and end the line early.
In addition, not all lines have to be collected. If your area of interest is only 4m x 4m, set the
Grid Size to 5m x 5m, but just don’t collect the outer lines.
7.3.2. Data collection on the Display Unit
The data collection screen is shown in Figure 7-3. The right half of the screen is a graphic
representation of the grid, illustrating the size of the grid and the lines that need to be collected.
The left half of the screen will display the last grid line collected.
47
Grid Scan
Figure 7-3: Grid data collection screen
Press Start when you are positioned at the start of the line. Push the system in a straight line
towards the end of the line. The system knows the length of each line, and will automatically
stop acquisition once that distance has been covered. If the data acquisition ends prior to
reaching the end of the line, or continues noticeably past it, you likely need to do an Odometer
Calibration (Section 4.4.3).
Once data is collected, the Grid Line will turn red. The current line will now advance to the next
one and is shown in white. The remaining lines to be collected are shown in green.
Move back to the start of the next line and repeat the process. Once all the lines are done in
one direction, it will automatically prompt you to collect lines in the other direction.
7.3.3. Recollecting & skipping lines
You may want to recollect a line if you make a mistake. To move to a different line:
•
•
•
Press the + and - buttons under Grid Line OR
Touch any line on the grid image on the right OR
Use the 4-way directional keypad
Then simply hit Start. You will be prompted with a message asking if you want to overwrite that
line (Figure 7-4). Press Yes to proceed.
48
Grid Scan
Figure 7-4: Overwriting a line
7.3.4. Processing data
Once you have finished collecting all the data, press Slice View at the bottom of the screen.
The data will be processed and depth slices will be generated. See the next section on using
Slice View.
49
Grid Scan
50
Slice View
8. Slice View
Slice View displays data collected in a grid as a series of depth slices moving deeper into the
subsurface. Objects and features appear in plan view, which can be an easier way of
visualizing the data. In addition, data in this view can be exported into other software, such as
Google EarthTM.
Upon entering Slice View, the screen will be displayed as shown in Figure 8.1.
Depth slice
range
Soil Cal
Depth slice
indicator
Grid Line
displayed
on left
Line Scan
Depth
Slice
Figure 8-1: Slice View screen
The right half of the screen shows one of the depth slices. These slices are 10cm or 4” thick.
The top and right sides of this image show the dimensions of the grid while the left and bottom
sides show the line numbers.
The left half of the screen displays one of the grid lines, and any flags or interpretations that
were made. The shaded area in between the horizontal red lines corresponds to the depth slice
shown on the right. To move to another grid line, use the 4-way directional keypad on the
Display Unit.
At the top of the screen, the grid number is listed, along with the slice thickness range. The Soil
Cal number was automatically determined when the grid data was processed and is indicated
here.
The button functionality is explained below:
51
Slice View
8.1. Depth
Pressing the + and - buttons on the Depth button will increase or decrease the depth of the
depth slice currently displayed. This allows the user to “slice through” the ground, and locate
features that appear at different depths.
8.2. Color
This heading has two button functions beneath it:
a) Color Palette - The number corresponds to the color palette used for the depth slice
image. Pressing this button cycles between the 9 available color palettes available on
the system.
b) Color Sensitivity - cycles between LOW, MEDIUM and HIGH. This is a function of how
much signal data is displayed. A setting of HIGH is useful for revealing weaker targets
which can sometimes be difficult to see. Setting to LOW will help “clean up” the data and
only show the strong targets, but will hide some of the weak signals so be CAREFUL
when setting to LOW. Figure 8-2 shows the variations in color sensitivity
52
Slice View
Figure 8-2: Varying the sensitivity, from top to bottom: Low, Medium and High settings. High shows more subtle
targets but may sometimes appear cluttered while the Low setting only displays the strongest targets so be cautious
when using it.
8.3. Grid Lines
Press this button to overlay the grid lines on the depth slice image. It is useful to see grid lines
so you know the position of the GPR Line in the grid (displayed in white). Pressing this button
cycles between ON, PARTIAL or OFF. When set to ON, all the collected lines are displayed.
When set to PARTIAL, only some of the grid lines are displayed. This may be necessary for
some larger grids as having all the grid lines ON tends to obscure the image beneath (Figure 83).
53
Slice View
Figure 8-3: Varying the Grid Lines, from top to bottom: ON, PARTIAL and OFF settings.
54
Slice View
8.4. Line View
Pressing this button displays the currently selected GPR line as a full screen image. All the
functionality of Line Scan (such as depth, color, filter, gain, DynaT, Soil Cal, interps) are
available here. Use the 4-way directional keypad to change to a different line.
Figure 8-4: Changing Line View settings from within Slice View.
Press Exit to return to Slice View. Any changes made will be reflected on the GPR line in Slice
View mode. If you change the Soil Cal or Zoom (depth), this will cause the depth slices to be
re-processed.
Users may want to change these display settings to make it easier to correlate line scan data
with depth slices.
8.5. Recollecting lines
After looking at the grid data in Slice View you may discover that one or more grid lines need to
be recollected (for example, maybe the starting position was offset). If so, you will need to enter
the Grid Scan menu again and select the appropriate grid number and press Start (the grid
number will be in red, since data exists).
Select the grid line that needs to be recollected. When you press Start, it will display a prompt
confirming if you want to overwrite the line. After recollecting the grid line(s), press the Slice
View button to re-process the grid data.
55
Slice View
56
Map View
9. Map View
Map View is a unique feature that allows the user to graphically view the path travelled by the
system, and any flags or interpretations made. This is helpful in determining the linearity and
consistency of buried objects. It will also display a view showing the lines collected as part of a
grid.
A common use of this feature is to snake back and forth over a given area. Each time you cross
a target producing a hyperbola, back up to the top of the hyperbola and add an interpretation. If
the object is a linear feature, all the interpretations will line up when viewed in Map View.
Map View only works if GPS data is collected with the GPR data. This is what allows the lines
and/or grids to be positioned correctly (with the right orientation).
If you use the internal GPS, only grid data will be shown in Map View. If an external GPS is
connected, both line and grid data will be shown.
9.1. Accessing Map View (LMX200)
You will only see Map View when you enter either a line or grid
Figure 9-1: Accessing Map View from LMX200
9.2. Accessing Map View (LMX200 Enhanced)
Map View can be accessed from the File Management menu or from the main screen.
Remember that in the Enhanced configuration, Map View is project based, meaning it will
display all lines and grids that are present in a given project.
57
Map View
Figure 9-2: Accessing Map View from LMX200 Enhanced, either from the a) Main screen or b) File Management
menu
9.3. Map View screen
Irrespective of the system configuration, entering Map View will show an image similar to the
one in Figure 9-3. You will always have the same options in Map View which are described
below:
Figure 9-3: Map View showing the position of two grids and one line
•
Pressing Zoom +/- will zoom accordingly. To reposition the image in the middle of the
screen, simply swipe the screen until the image is positioned properly.
•
Pressing Map Lines will turn the grid lines on or off.
•
Pressing the Camera button saves the screen as a screenshot
58
Capturing Screens & E-mailing mini-reports
10. Capturing Screens & E-mailing mini-reports
10.1. Capturing Screens
If you would like to save an image of the current screen in Line Scan, Grid Scan, Slice View or
Map View, press the Camera button on the Display Unit. This saves the screen as a
Screenshot image (.JPG), which can be viewed in any third-party viewing software. If any GPS
is enabled, the screenshot image (only for Line Scan and Slice View screens) will contain also a
geo-tagged reference.
If you are not connected to a WiFi network, a message appears confirming the filename of the
saved image (Figure 10-1).
Figure 10-1: Message displayed after pressing the camera button on the Display Unit to capture the screen (no WiFi
present).
If you are connected to a wireless network and have a sending e-mail address configured, the
user will see the message in Figure 10-2, asking if you would like to email the screenshot and
prompts you to enter the email address. The email address defaults to the last one entered.
Pressing the “J” button to the left of the e-mail address displays the last 5 e-mail addresses
used, allowing the user to easily select a recent email, rather than re-entering it.
Screenshots can always be e-mailed at a later time from the Screenshot Gallery (Section 4.3.1).
I
59
Capturing Screens & E-mailing mini-reports
Figure 10-2: Message after pressing the Camera button on the Display Unit to capture the screen with WiFi enabled
and a connection to a wireless network. The user can enter an email address to send the mini-report to.
10.2. Mini-Reports
When a screenshot is e-mailed, it is sent as part of a mini-report. This mini-report also contains
a table with information about the collected data including the settings used, date & time (Figure
10-3)
60
Capturing Screens & E-mailing mini-reports
Figure 10-3: Example of a Mini-Report
61
Capturing Screens & E-mailing mini-reports
62
Transferring Data to a PC
11. Transferring Data to a PC
Screenshot images (and data if you have the Enhanced system) can be exported to a PC, via a
USB memory stick.
USB-memory
stick
Figure 11-1: Insert a USB memory stick into the USB port on the Display Unit to export data.
Insert a USB drive into the USB port (Figure 11-1). Once the USB drive is recognized, a
message will appear telling you that a drive has been inserted and if you wish to export your
data to it (Figure 11-2). Click Yes.
Figure 11-2: When a USB drive is connected to the Display Unit, a message opens asking if you would like to export
all your data to it. Select Yes to transfer immediately. If you select No, you can export the data later by going to the
Setup > File Management menu option.
63
Transferring Data to a PC
Alternatively, if you want to export the data later, you can select No for the time being. Later on,
when you are ready to export your data, from the main menu select Setup > File Management
and press Export Data (Section 11)
The directory structure on the USB drive can be viewed on your PC, and will look as follows:
•
GPR Data
• LMX200
o Export01
Project1
• Screen Shots
o All Screenshots as .JPG files
• Project1.GPZ file
• Project1.KMZ file
• Field Interp Report.CSV
Project2
• Screen Shots
o All Screenshots as .JPG files
• Project2.GPZ file
• Project2.KMZ file
• Field Interp Report.CSV
System Info
o Exportxx
Projectx
• Screen Shots
o All Screenshots as .JPG files
• .GPZ file
• .KMZ file
• Field Interp Report.CSV
System Info
All screenshot files are saved as .JPG files
The actual GPR data files are all contained in a .GPZ file. This can be opened by the
EKKO_Project software.
If data was collected with GPS (internal or external), a .KMZ file is also generated. This
contains positional information and can easily be opened in Google EarthTM.
If any Interpretations were made, these are saved in a .CSV file. This is a spreadsheet file,
which shows the positional information of any interps made.
The System Info folder contains log files and a system summary diagnostic report.
Each successive export of data will create a new directory called ExportXX, where XX is
incremented by 1 from the previous directory.
64
WiFi Module
12. Troubleshooting
The LMX200 system is designed to minimize user problems; however, all electronic devices are
subject to possible failure. The following are troubleshooting hints which can be referred to if
your system fails to operate.
12.1. Power Supply
The most common problem that can occur while trying to run the system is insufficient power.
The battery may be dead, have a low voltage or the fuse may be blown.
Once boot up is complete, the colour of the LED will indicate the amount of battery power
remaining:
• 100% to 20% = green
• 20% to 10% = orange
• 10% to 0% = red
You can check the battery voltage with a voltmeter. Try to do this while the system is still
attached to the Cart to get a true measure of the voltage while under load (it will be necessary to
open the Cart battery case and connect the voltmeter to the positive and negative battery
terminals). A fully charged battery will show a voltage of 13.8V, whereas a voltage of 10.8V or
lower will not power the system. If the battery has a low voltage or seems dead, try using
another battery (if available), or give the battery a good 12-14 hour charge and try running the
system again.
If the battery does not charge up to 12 Volts or more, it should be replaced.
Batteries are fused to protect the system. Open the battery case and check that the 10 Amp
fuse is OK. If necessary, replace it with one of the spare fuses available inside the battery case.
If the battery seems OK but the system still does not power up, check the battery cable
connections and inspect the battery cable for damage.
12.2. System Communications
If the battery is OK and the Display Unit turns on but the GPR sensor does not scan, there may
be a communication failure between the Display Unit and the GPR sensor. If an error occurs,
an error message will appear. Power Off the system and disconnect the battery.
Make sure the display cable is not damaged, all pins are straight, and there is no dirt or debris in
the connector. Ensure that the cable connections are tightly secured. Sometimes vibrations
cause the cable connections to slightly loosen and break contact leading to errors.
Disconnecting the cable and reconnecting it may provide a better contact and solve the
problem. Plug in the battery, turn on the system and try scanning again.
65
Troubleshooting
If the Battery, Battery Cable and Display Cable are OK, the problem is either a failure of the
Display Unit or the GPR sensor. These units have no user-serviceable parts so they will have
to be returned to the vendor for inspection and repair.
12.3. System Overheating
The GPR system is designed to operate to a maximum internal temperature of 70 C or 158 F.
In situations of high ambient temperatures or long exposure to direct sun, this maximum internal
temperature may be exceeded and cause the system to fail.
If you suspect that the GPR sensor is overheating, shut it off and give it a chance to cool down
in a shady location before trying to run it again.
If the situation is such that the high temperatures or direct sun cannot be avoided, it may be a
good idea to put some sort of shade over the GPR sensor.
12.4. Display Unit Problem
The Display Unit is weatherproof and rugged, it should be handled in much the same way a
notebook computer is. If the Display Unit does not power up, check the battery power and all
cable connection. If that doesn't work, contact the manufacturer.
12.5. Wobbly Wheels
If, over time, a wheel becomes wobbly, the wheel nut will need to be manually tightened.
For the rear right wheel only (which is connected to the direct drive odometer), insert a large
slotted screwdriver into the end of the axle (there’s already a slot there for it) and use a large
wrench to slightly tighten the wheel nut. The nut only has to be turned slightly, 1/8th -1/16th of a
turn is usually enough. Spin the wheel to make sure it’s still free and not too tight.
12.6. Creating a Test Line for Data Quality
After receiving the system and getting comfortable with its operation, one of the best ways of
detecting any problems is to collect a line of data at a convenient, easily accessible location.
The line does not have to be too long but one screen is a good guide. This data line should be
saved electronically and perhaps plotted out on paper and dated. If there is a suspected
problem with the system, this test line could be collected and compared with earlier tests. When
comparing data, take into account weather and environmental conditions, which could skew the
comparisons slightly.
66
Troubleshooting
12.7. Contacting the Vendor for Service
When returning the system to the Vendor, have the following information available:
1)
GPR sensor Serial Number displayed at the top of the System Settings Screen.
2)
A brief description of when the error is happening and the operating conditions
(temperature, humidity, sunshine, system settings, etc.).
3)
System log files downloaded to your computer
12.8. Using the Hotspot on your Smartphone
If you are experiencing difficulty connecting to a cell phone Personal Hotspot, ensure that the
phone is in discovery mode while connecting. On iPhone (iOS 9.0), for example, this involves
going to Settings - Personal Hotspot. Ensure that the Personal Hotspot setting is turned on,
and wait on this screen until the LMX200 connection has been established. Once you have
received confirmation on the Display Unit, the cell phone can resume normal use.
Note that when setting up a Personal Hotspot, you may be disconnected from any WiFi
networks. Vice-versa, if you have a Personal Hotspot setup, attempting to connect to a WiFi
network may disconnect your personal hotspot.
67
WiFi Module
68
Care and Maintenance
13. Care and Maintenance
13.1. Battery Care
The LMX200 uses a 9-Amp-hour, 12-Volt sealed lead acid battery. It is fused with a 10 Amp
fuse to protect it from short circuit damage.
The battery unit should run the LMX200 continuously for 6 hours before recharging is
necessary. If long days of data surveying are typical, a second battery unit may be useful.
The battery is strapped onto the cart base and is normally recharged without removing it from
the cart. However, the battery can be easily removed for maintenance or for recharging, if
required.
If batteries are maintained in a charged condition they will give long life and reliable service.
Improper use and lack of maintenance will greatly reduce their life.
Sealed lead acid batteries should NEVER be left in a discharged condition for any period of
time. Charge the batteries as soon as possible after use.
Charge the battery at room temperature whenever possible.
The LMX200 has a voltage monitoring circuit that will turn off the unit when the input voltage
drops below 10.8 volts.
If a battery has been deeply discharged or left in a discharged condition for some period of time
it may not accept charge immediately when it is connected to the charger (the fast charge light
will not illuminate). If the fast charge light does not come on within 6 hours the battery should be
considered damaged and should be discarded.
Do not assume that a battery that is still charging after 8 hours is nearing the end of its charge
cycle. Typical charging time for an empty battery is 12-14 hours from the start of fast charge.
Ensure that the batteries are fully charged before storing. If practical, store the batteries in a
cool place, 10oc (a refrigerator is ideal), but make sure the temperature is not likely to drop
below -30oC or the electrolyte may freeze and possibly split the case.
13.2. Cable Care
1)
The cable connectors as well as the connectors on the GPR Sensor and Display Unit
need to stay clean and free of dust and moisture. Use a brush or air spray to clean
dust, lint and other foreign particles from these connectors.
69
Care and Maintenance
2)
When the system is not being used, make sure the connections are protected to
prevent dust and moisture from collecting inside. If the connectors are exposed, cover
them with some sort of dust cap.
3)
Cables are designed to be as tough as practical.
4)
Careless use of cables like making them carry loads that they are not designed for
can cause internal damage.
5)
Connectors are weak points in any system. With the use of this product in rough,
dusty and outdoor environments, users can minimize potential downtime if they care
for cables and treat connectors with respect.
6)
Cables and connectors are not designed to suspend or tow or otherwise carry the
weight of systems. They are part of the electronic circuit and should be treated
accordingly. When not in use they should be placed in their storage box.
13.3. Skid Pads
The bottom of the GPR Sensor is covered with one large wear-resistant skid pad. The skid pad
is designed to take the majority of the abrasive wear. If the pad wears down enough, the lessresistant plastic housing may start to wear. If this occurs, it is best to replace the skid pad. It is
easily removed with a screwdriver and a new one can be purchased from the vendor.
13.4. Odometer
The odometer should be periodically calibrated (refer to Section 4.4.3) to ensure accuracy.
13.5. Storage Cases
Equipment that is transported and stored loosely is more susceptible to damage. All equipment
should be stored in its shipping case or a storage box. Sensors & Software has optional
shipping cases available for all LMX200 systems.
70
Technical Specifications
14. Technical Specifications
Specifications
GPR Sensor size
GPR Sensor weight
Display Unit weight
Display Unit screen
Battery weight
Wireless
Audio
Battery
Charger
Values
630 x 410 x 230 mm (25 x 16 x 9 in)
5 kg (11 lbs)
2.83 kg (6.24 lbs)
8.0" high-visibility, sunlight-readable diagonal LCD display with
touch screen
Adjustable backlighting
1500 NIT and 800:1 contrast ratio
4 kg (8.8 lbs)
Integrated modules:
Wi-Fi (IEEE 802.11 b,g,n)
GPS/GLONASS
Built-in speaker - 85dBA speaker w/volume control
Lead acid gel cell
Battery Life: 4-6 hours
Battery Capacity:9.0 Ah
Built-in charger with status indicator
Universal AC mains charger input: 100-240V
50/60Hz
, 1.5A,
Output: 12 Volts @ 3 Amps
DVL-500N Display Unit
11-18V
Input
Temperature &
Environmental
Regulatory
Specifications
, 4A maximum
Ruggedized, environmentally sealed unit and connections.
Ingress protection (IP) rating: DVL-500N Display Unit is
rated to IP65 under IEC 60529
Relative Humidity operation (non-condensing): 10 – 90%
GPR Sensor and DVL-500N operating temperature range: 40 to 50°C
Do not use touch screen below -20°C.
Use battery charger between 0 and 30°C.
EMC-FCC, CE, IC, ACA, RSM
Safety-TUV, CE
71
Technical Specifications
72
Technical Specifications
Appendix A: Health & Safety Certification
Radio frequency electromagnetic fields may pose a health hazard when the fields are intense.
Normal fields have been studied extensively over the past 30 years with no conclusive
epidemiology relating electromagnetic fields to health problems. Detailed discussions on the
subject are contained in the references and the web sites listed below.
The USA Federal Communication Commission (FCC) and Occupational Safety and Health
Administration (OSHA) both specify acceptable levels for electromagnetic fields. Similar power
levels are mandated by corresponding agencies in other countries. Maximum permissible
exposures and time duration specified by the FCC and OSHA vary with excitation frequency.
The lowest threshold plane wave equivalent power cited is 0.2 mW/cm2 for the general
population over the 30 to 300 MHz frequency band. All other applications and frequencies have
higher tolerances as shown in graphically in Figure B-1.
2
Figure B-0-1: FCC limits for maximum permissible exposure (MPE) plane-wave equivalent power density mW/cm .
All Sensors & Software Inc. GPR products are normally operated at least 1 m from the user and
as such are classified as “mobile” devices according to the FCC. Typical power density levels
at a distance of 1 m or greater from any Sensors & Software Inc. products are less than 10-3
mW/cm2 which is 200 to 10,000 times lower than mandated limits. As such, Sensors &
Software Inc. products pose no health and safety risk when operated in the normal manner of
intended use.
A1
Technical Specifications
A2
Appendix B: GPR Emissions, Interference and Regulations
Appendix B: GPR Emissions, Interference and
Regulations
All governments have regulations on the level of electromagnetic emissions that an electronic
apparatus can emit. The objective is to assure that one apparatus or device does not interfere
with any other apparatus or device in such a way as to make the other apparatus nonfunctional.
The manufacturer test their GPR products using independent professional testing houses and
comply with latest regulations of the USA, Canada, European Community, and other major
jurisdictions on the matter of emissions.
Electronic devices have not always been designed for proper immunity. If a GPR instrument is
placed in close proximity to an electronic device, interference may occur. While there have
been no substantiated reports of interference to date, if any unusual behavior is observed on
nearby devices, test if the disturbance starts and stops when the GPR instrument is turned on
and off. If interference is confirmed, stop using the GPR.
Where specific jurisdictions have specific GPR guidelines, these are described below.
B-1 FCC Regulations
This device complies with Part 15 of the USA Federal Communications Commission (FCC)
Rules. Operation in the USA is subject to the following two conditions:
this device may not cause harmful interference and
this device must accept any interference received, including interference that may cause
undesired operation.
Part 15 – User Information
This equipment has been tested and found to comply with the limits for a Class A digital device,
where applicable, and for an ultra-wide bandwidth (UWB) device where applicable, pursuant to
Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against
harmful interference when the equipment is operated in a commercial environment. This
equipment uses and can radiate radio frequency energy and, if not installed and used in
accordance with the instruction manual, may cause harmful interference to radio
communications. Operation of this equipment in a residential area is likely to cause harmful
interference in which case the user will be required to correct the interference at his/her own
expense.
WARNING
Changes or Modifications not expressly approved by the manufacturer could void the user’s
authority to operate the equipment.
Certification of this equipment has been carried out using approved cables and peripheral
devices. The use of non-approved or modified cables and peripheral devices constitutes a
Change or Modification outlined in the warning above.
Operating Restrictions
Operation of this device is limited to purposes associated with law enforcement, firefighting,
emergency rescue, scientific research, commercial mining, or construction. Parties operating
this equipment must be eligible for licensing under the provisions of Part 90 of this chapter.
FCC Interpretation of Operation Restrictions issued July 12, 2002
(FCC Order DA02-1658, paragraph 9)
B1
Appendix B: GPR Emissions, Interference and Regulations
The regulations contain restrictions on the parties that are eligible to operate imaging systems
(See 47 C.F.R. 5.509(b), 15.511(b), and 15.513(b)). Under the new regulations, GPRs and wall
imaging systems may be used only by law enforcement, fire and emergency rescue
organizations, by scientific research institutes, by commercial mining companies, and by
construction companies. Since the adoption of the Order, we have received several inquiries
from the operators of GPRs and wall imaging systems noting that these devices often are not
operated by the users listed in the regulations but are operated under contract by personnel
specifically trained in the operation of these devices. We do not believe that the recent adoption
of the UWB rules should disrupt the critical safety services that can be performed effectively
only through the use of GPRs and wall imaging systems. We viewed these operating
restrictions in the broadest of terms. For example, we believe that the limitation on the use of
GPRs and wall imaging systems by construction companies encompasses the inspection of
buildings, roadways, bridges and runways even if the inspection finds no damage to the
structure and construction does not actually result from the inspection; the intended purpose of
the operation of the UWB device is to determine if construction is required. We also believe that
the GPRs and wall imaging systems may be operated for one of the purposes described in the
regulations but need not be operated directly by one of the described parties. For example, a
GPR may be operated by a private company investigating forensic evidence for a local police
department.
FCC Permitted Mode of Usage
The GPR antenna must be kept on the surface to be in compliance with FCC regulations. Use
of the antenna is not permitted if it is lifted off the surface. Use as a through-the-wall imaging
device is prohibited.
GPR Use Coordination
FCC regulation 15.525(c) (updated in February 2007) requires users of GPR equipment to
coordinate the use of their GPR equipment as described below:
TITLE 47--TELECOMMUNICATION
CHAPTER I--FEDERAL COMMUNICATIONS COMMISSION
PART 15_RADIO FREQUENCY DEVICES
Subpart F_Ultra-Wideband Operation Sec.
15.525 Coordination requirements.
(a) UWB imaging systems require coordination through the FCC before the equipment may
be used. The operator shall comply with any constraints on equipment usage resulting from this
coordination.
(b) The users of UWB imaging devices shall supply operational areas to the FCC Office of
Engineering and Technology, which shall coordinate this information with the Federal
Government through the National Telecommunications and Information Administration. The
information provided by the UWB operator shall include the name, address and other pertinent
contact information of the user, the desired geographical area(s) of operation, and the FCC ID
number and other nomenclature of the UWB device. If the imaging device is intended to be
used for mobile applications, the geographical area(s) of operation may be the state(s) or
county(ies) in which the equipment will be operated. The operator of an imaging system used
for fixed operation shall supply a specific geographical location or the address at which the
equipment will be operated. This material shall be submitted to:
Frequency Coordination Branch, OET
Federal Communications Commission
445 12th Street, SW, Washington, D.C.
20554
Attn: UWB Coordination
B2
Appendix B: GPR Emissions, Interference and Regulations
(Sensors & Software Inc. Note: The form given on the following page is a suggested format for
performing the coordination.)
(c) The manufacturers, or their authorized sales agents, must inform purchasers and users of
their systems of the requirement to undertake detailed coordination of operational areas with the
FCC prior to the equipment being operated.
(d) Users of authorized, coordinated UWB systems may transfer them to other qualified users
and to different locations upon coordination of change of ownership or location to the FCC and
coordination with existing authorized operations.
(e) The FCC/NTIA coordination report shall identify those geographical areas within which the
operation of an imaging system requires additional coordination or within which the operation of
an imaging system is prohibited. If additional coordination is required for operation within
specific geographical areas, a local coordination contact will be provided. Except for operation
within these designated areas, once the information requested on the UWB imaging system is
submitted to the FCC no additional coordination with the FCC is required provided the reported
areas of operation do not change. If the area of operation changes, updated information shall be
submitted to the FCC following the procedure in paragraph (b) of this section.
(f) The coordination of routine UWB operations shall not take longer than 15 business days
from the receipt of the coordination request by NTIA. Special temporary operations may be
handled with an expedited turn-around time when circumstances warrant. The operation of
UWB systems in emergency situations involving the safety of life or property may occur without
coordination provided a notification procedure, similar to that contained in Sec. 2.405(a) through
(e) of this chapter, is followed by the UWB equipment user.[67 FR 34856, May 16, 2002, as
amended at 68 FR 19751, Apr. 22, 2003]
Effective Date Note: At 68 FR 19751, Apr. 22, 2003, Sec. 15.525 was amended by revising
[[Page 925]] paragraphs (b) and (e). This amendment contains information collection and
recordkeeping requirements and will not become effective until approval has been given by the
Office of Management and Budget.
B3
Appendix B: GPR Emissions, Interference and Regulations
FCC GROUND PENETRATING RADAR COORDINATION NOTICE
NAME:
ADDRESS:
CONTACT INFORMATION [CONTACT NAME AND PHONE NUMBER]:
AREA OF OPERATION [COUNTIES, STATES OR LARGER AREAS]:
FCC ID: QJQ-NG250
EQUIPMENT NOMENCLATURE: NG250
Send the information to:
Frequency Coordination Branch., OET
Federal Communications Commission
445 12th Street, SW
Washington, D.C. 20554
ATTN: UWB Coordination
Fax:
202-418-1944
INFORMATION PROVIDED IS DEEMED CONFIDENTIAL
B4
Appendix B: GPR Emissions, Interference and Regulations
B-2 ETSI Regulations for the EC (European Community)
In the European Community (EC), GPR instruments must conform to ETSI (European Technical
Standards Institute) standard EN 302 066-1 v1.2.1. Details on individual country requirements
for licensing are coordinated with this standard. For more information, contact Sensors &
Software’s technical staff.
All Sensors & Software ground penetrating radar (GPR) products offered for sale in European
Community countries or countries adhering to ETSI standards are tested to comply with EN 302
066 v1.2.1.
For those who wish to get more detailed information, they should acquire copies of the following
documents available from ETSI.
ETSI EN 302 066-1 V1.2.1 (February 2008) Electromagnetic compatibility and Radio spectrum
Matters (ERM); Ground and Wall- Probing Radar applications (GPR/WPR) imaging systems;
Part 1: Technical characteristics and test methods
ETSI EN 302 066-2 V1.2.1 (February 2008) Electromagnetic compatibility and Radio spectrum
Matters (ERM); Ground and Wall- Probing Radar applications (GPR/WPR) imaging systems;
Part 2: Harmonized EN covering essential requirements of article 3.2 of the R&TTE Directive
ETSI TR 101 994-2 V1.1.2 (March 2008) Electromagnetic compatibility and Radio spectrum
Matters (ERM); Short Range Devices (SRD); Technical characteristics for SRD equipment using
Ultra Wide Band technology (UWB); Part 2: Ground- and Wall- Probing Radar applications;
System Reference Document
B5
Appendix B: GPR Emissions, Interference and Regulations
B-3a Industry Canada Regulations - English
Industry Canada published it regulations for ground penetrating radar (GPR) on Mar 29 2009 as
part of the RSS-220 titled 'Devices Using Ultra-Wideband (UWB) Technology'.
Industry Canada has made a unique exception for GPR by not requiring user licensing. The
user does have to comply with the following directives:
This Ground Penetrating Radar Device shall be operated only when in contact with or within 1 m
of the ground.
This Ground Penetrating Radar Device shall be operated only by law enforcement agencies,
scientific research institutes, commercial mining companies, construction companies, and
emergency rescue or firefighting organizations.
Should the ground penetrating radar be used in a wall-penetrating mode then the following
restriction should be noted by the user:
This In-wall Radar Imaging Device shall be operated where the device is directed at the wall
and in contact with or within 20 cm of the wall surface.
This In-wall Radar Imaging Device shall be operated only by law enforcement agencies,
scientific research institutes, commercial mining companies, construction companies, and
emergency rescue or firefighting organizations.
Since operation of GPR is on a license-exempt basis, the user must accept the following:
Operation is subject to the following two conditions: (1) this device may not cause interference,
and (2) this device must accept any interference, including interference that may cause
undesired operation of the device.
B6
Appendix B: GPR Emissions, Interference and Regulations
B-3b Règlement d'Industrie Canada - Français
Industrie Canada a publié des règlements pour les appareils géoradar (GPR) le 29 mars 2009,
dans le cadre du RSS-220 intitulé "Dispositifs utilisant la bande ultra-large (UWB)".
Industrie Canada a faite une exception unique pour GPR en n'exigeant pas de licence par
utilisateur. L'utilisateur doit se conformer aux directives suivantes:
Ce géoradar périphérique doit être utilisé que lorsqu'il est en contact avec ou moins de 1 m du
sol.
Ce géoradar périphérique doit être utilisé que par les organisations d'application de la loi, les
instituts de recherche scientifique, des sociétés minières commerciales, entreprises de
construction et de secours d'urgence ou des organisations de lutte contre les incendies.
Si le géoradar est utilisé dans un mode de pénétration au mur, la restriction suivante est à noter
par l'utilisateur:
Ce dispositif d'imagerie radar doit être utilisé lorsque l'appareil est orienté vers le mur et en
contact avec ou dans les 20 cm de la surface du mur.
Ce dispositif d'imagerie radar doit être utilisé que par les organisations d'application de la loi, les
instituts de recherche scientifique, des sociétés minières commerciales, entreprises de
construction et de secours d'urgence ou des organisations de lutte contre les incendies.
Parce que l'exploitation de GPR est sur une base exempte de licence, l'utilisateur doit accepter
le texte suivant:
La fonctionnement est soumis aux deux conditions suivantes: (1) cet appareil ne peut pas
provoquer d'interférences et (2) cet appareil doit accepter toute interférence, y compris les
interférences qui peuvent causer un mauvais fonctionnement du dispositive
B7
Appendix B: GPR Emissions, Interference and Regulations
B8
Appendix C: Instrument Interference
Appendix C: Instrument Interference
Immunity regulations place the onus on instrument/apparatus/device manufacturers to assure
that extraneous interference will not unduly cause an instrument/apparatus/device to stop
functioning or to function in a faulty manner.
Based on independent testing house measurements, Sensors & Software Inc. systems comply
with such regulations in Canada, USA, European Community and most other jurisdictions. GPR
devices can sense electromagnetic fields. External sources of electromagnetic fields such as
TV stations, radio stations and cell phones, can cause signals detectable by a GPR which may
degrade the quality of the data that a GPR device records and displays.
Such interference is unavoidable but sensible survey practice and operation by an experienced
GPR practitioner can minimize such problems. In some geographic areas emissions from
external sources may be so large as to preclude useful measurements. Such conditions are
readily recognized and accepted by the professional geophysical community as a fundamental
limitation of geophysical survey practice. Such interference being present in the GPR
recordings is not considered as an equipment fault or as a failure to comply with immunity
regulations.
C1
Appendix C: Instrument Interference
C2
Appendix D: Safety around Explosive Devices
Appendix D: Safety around Explosive Devices
Concerns are expressed from time to time on the hazard of GPR products being used near
blasting caps and unexploded ordnance (UXO). Experience with blasting caps indicates that the
power of Sensors & Software Inc.’s GPR products is not sufficient to trigger blasting caps.
Based on a conservative independent testing house analysis, we recommend keeping the GPR
transmitters at least 5 feet (2m) from blasting cap leads as a precaution. Some customers do
experimental trials with their particular blasting devices to confirm with safety. We strongly
recommend that GPR users routinely working with explosive devices develop a systematic
safety methodology in their work areas.
The UXO issue is more complex and standards on fuses do not exist for obvious reasons. To
date, no problems have been reported with any geophysical instrument used for UXO. Since
proximity and vibration are also critical for UXO, the best advice is to be cautious and
understand the risks.
D1
Appendix D: Safety around Explosive Devices
D1
WiFi Module
Appendix E: WiFi Module
FCC Notice:
NOTE: This equipment has been tested and found to comply with the limits for a Class
A digital device, pursuant to part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference when the equipment is operated in a
commercial environment. This equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used in accordance with the instruction
manual, may cause harmful interference to radio communications. Operation of this
equipment in a residential area is likely to cause harmful interference in which case the
user will be required to correct the interference at his/her own expense.
Industry Canada Notice:
This device complies with Industry Canada’s license-exempt RSSs. Operation is subject to the
following two conditions:
(1) This device may not cause interference; and
(2) This device must accept any interference, including interference that may cause undesired
operation of the device.
E1
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